From ef34698a0023648c60e087a01db82e7703a64436 Mon Sep 17 00:00:00 2001
From: Daniel Peter Chokola <dan.chokola@gmail.com>
Date: Sun, 26 Feb 2023 21:48:25 -0500
Subject: [PATCH] convert & print temperature, pressure, and humidity to USB
 serial

Enough to start hacking, adding features, and refining.
---
 .cproject                   |  55 +++--
 Core/Inc/main.h             |   2 +-
 Core/Inc/terminal.h         |  24 ++
 Core/Inc/util.h             |  46 ++++
 Core/Src/gpio.c             |   2 +-
 Core/Src/main.c             |  19 +-
 Core/Src/spi.c              |   2 +-
 Core/Src/terminal.c         | 136 ++++++++++
 Drivers/BME280/Inc/bme280.h |  57 +++++
 Drivers/BME280/Src/bme280.c | 477 ++++++++++++++++++++++++++++++++++++
 hothouse-mon.ioc            |  11 +-
 11 files changed, 799 insertions(+), 32 deletions(-)
 create mode 100644 Core/Inc/terminal.h
 create mode 100755 Core/Inc/util.h
 create mode 100644 Core/Src/terminal.c
 create mode 100755 Drivers/BME280/Inc/bme280.h
 create mode 100755 Drivers/BME280/Src/bme280.c

diff --git a/.cproject b/.cproject
index 16623ca..1698297 100644
--- a/.cproject
+++ b/.cproject
@@ -24,13 +24,17 @@
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.813197789" name="Floating-point ABI" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.255620478" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="genericBoard" valueType="string"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.752622469" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F401CCUx || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/CMSIS/Include | ../USB_DEVICE/App | ../USB_DEVICE/Target | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc ||  ||  || USE_HAL_DRIVER | STM32F401xC ||  || Drivers | Core/Startup | Middlewares | Core | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoprintffloat.1376255223" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.nanoprintffloat" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.1998061963" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
 							<builder buildPath="${workspace_loc:/hothouse-mon}/Debug" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.766542675" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.2104471420" name="MCU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.1776738573" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.value.g3" valueType="enumerated"/>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.definedsymbols.1055126530" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.definedsymbols" valueType="definedSymbols">
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.1776738573" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.value.g3" valueType="enumerated"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.definedsymbols.1055126530" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="DEBUG"/>
 								</option>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.includepaths.515449045" name="Include paths (-I)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.includepaths" useByScannerDiscovery="false" valueType="includePath">
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/BME280/Inc}&quot;"/>
+								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input.971296292" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.1210937770" name="MCU GCC Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler">
@@ -51,6 +55,7 @@
 									<listOptionValue builtIn="false" value="../USB_DEVICE/Target"/>
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Core/Inc"/>
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/BME280/Inc}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c.746395805" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c"/>
 							</tool>
@@ -59,7 +64,7 @@
 								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level.1725010391" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level" useByScannerDiscovery="false"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.431262741" name="MCU GCC Linker" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script.70583072" name="Linker Script (-T)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script" value="${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld}" valueType="string"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script.70583072" name="Linker Script (-T)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script" useByScannerDiscovery="false" value="${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld}" valueType="string"/>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.input.302155928" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.input">
 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
 									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
@@ -102,27 +107,30 @@
 				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.release" cleanCommand="rm -rf" description="" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.release.377597308" name="Release" parent="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.release">
 					<folderInfo id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.release.377597308." name="/" resourcePath="">
 						<toolChain id="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.release.1752728520" name="MCU ARM GCC" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.release">
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu.1831914332" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu" useByScannerDiscovery="true" value="STM32F401CCUx" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid.593719162" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid" useByScannerDiscovery="false" value="0" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid.1433799001" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid" useByScannerDiscovery="false" value="0" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.747355076" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.1125100677" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1055393957" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="genericBoard" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.215791334" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Release || false || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F401CCUx || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/CMSIS/Include | ../USB_DEVICE/App | ../USB_DEVICE/Target | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc ||  ||  || USE_HAL_DRIVER | STM32F401xC ||  || Drivers | Core/Startup | Middlewares | Core | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu.1831914332" name="MCU" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu" useByScannerDiscovery="true" value="STM32F401CCUx" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid.593719162" name="CPU" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid" useByScannerDiscovery="false" value="0" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid.1433799001" name="Core" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid" useByScannerDiscovery="false" value="0" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.747355076" name="Floating-point unit" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.1125100677" name="Floating-point ABI" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1055393957" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="genericBoard" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.215791334" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Release || false || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F401CCUx || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/CMSIS/Include | ../USB_DEVICE/App | ../USB_DEVICE/Target | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc ||  ||  || USE_HAL_DRIVER | STM32F401xC ||  || Drivers | Core/Startup | Middlewares | Core | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.515036534" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
-							<builder buildPath="${workspace_loc:/hothouse-mon}/Release" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.663521244" managedBuildOn="true" name="Gnu Make Builder.Release" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
+							<builder buildPath="${workspace_loc:/hothouse-mon}/Release" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.663521244" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.479285305" name="MCU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">
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+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.1713256007" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.value.g0" valueType="enumerated"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.includepaths.457069664" name="Include paths (-I)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.includepaths" valueType="includePath">
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/BME280/Inc}&quot;"/>
+								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input.1006714338" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.300030486" name="MCU GCC Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.1252614775" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.value.g0" valueType="enumerated"/>
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.919045125" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.value.os" valueType="enumerated"/>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols.1840965707" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.1252614775" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.value.g0" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.919045125" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.value.os" valueType="enumerated"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols.1840965707" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="STM32F401xC"/>
 								</option>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths.328638015" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths" useByScannerDiscovery="false" valueType="includePath">
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths.328638015" name="Include paths (-I)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths" useByScannerDiscovery="false" valueType="includePath">
 									<listOptionValue builtIn="false" value="../Core/Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/STM32F4xx_HAL_Driver/Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy"/>
@@ -132,15 +140,16 @@
 									<listOptionValue builtIn="false" value="../USB_DEVICE/Target"/>
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Core/Inc"/>
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/BME280/Inc}&quot;"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c.1074930983" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.input.c"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.1201929364" name="MCU G++ Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel.865649225" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel.value.g0" valueType="enumerated"/>
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level.357932916" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level.value.os" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel.865649225" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.debuglevel.value.g0" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level.357932916" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.optimization.level.value.os" valueType="enumerated"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.2012916395" name="MCU GCC Linker" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script.1037074767" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script" value="${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld}" valueType="string"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script.1037074767" name="Linker Script (-T)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.script" value="${workspace_loc:/${ProjName}/STM32F401CCUX_FLASH.ld}" valueType="string"/>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.input.993487305" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.input">
 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
 									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
@@ -183,4 +192,12 @@
 			<autodiscovery enabled="false" problemReportingEnabled="true" selectedProfileId=""/>
 		</scannerConfigBuildInfo>
 	</storageModule>
+	<storageModule moduleId="refreshScope" versionNumber="2">
+		<configuration configurationName="Debug">
+			<resource resourceType="PROJECT" workspacePath="/hothouse-mon"/>
+		</configuration>
+		<configuration configurationName="Release">
+			<resource resourceType="PROJECT" workspacePath="/hothouse-mon"/>
+		</configuration>
+	</storageModule>
 </cproject>
\ No newline at end of file
diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index baf8ada..046e5ce 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -61,7 +61,7 @@ void Error_Handler(void);
 #define SPI2_CS_GPIO_Port GPIOB
 
 /* USER CODE BEGIN Private defines */
-
+#define APP_NAME "hothouse"
 /* USER CODE END Private defines */
 
 #ifdef __cplusplus
diff --git a/Core/Inc/terminal.h b/Core/Inc/terminal.h
new file mode 100644
index 0000000..f42172f
--- /dev/null
+++ b/Core/Inc/terminal.h
@@ -0,0 +1,24 @@
+/*
+ * terminal.h
+ *
+ *  Created on: Feb 26, 2023
+ *  Author: Daniel Peter Chokola
+ */
+
+#ifndef TERMINAL_H_
+#define TERMINAL_H_
+
+/* Includes */
+#include <stdint.h>
+#include "usbd_cdc_if.h"
+
+/* Definitions */
+#define TERM_RXBUF_LEN (APP_RX_DATA_SIZE)
+
+/* Function Prototypes */
+void term_prompt();
+void term_poll();
+void term_rx(char *buf, uint32_t len);
+void term_printf(const char *fmt, ...);
+
+#endif /* TERMINAL_H_ */
diff --git a/Core/Inc/util.h b/Core/Inc/util.h
new file mode 100755
index 0000000..2b0b6be
--- /dev/null
+++ b/Core/Inc/util.h
@@ -0,0 +1,46 @@
+/*
+ * util.h
+ *
+ *  Created on: Feb 26, 2023
+ *  Author: Daniel Peter Chokola
+ */
+
+#ifndef UTIL_H_
+#define UTIL_H_
+
+/* Definitions */
+#define return_if_fail(cond) \
+	if(!(cond)) { return; }
+#define return_val_if_fail(cond, val) \
+	if(!(cond)) { return (val); }
+#define return_null_if_fail(cond) return_val_if_fail((cond), NULL)
+/* MIN() and MAX() */
+#ifdef __GNUC__
+#	if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 9))
+/* prevent double evaluation */
+#		define MIN(a,b)	\
+	__extension__({ __auto_type _a = (a); \
+	                __auto_type _b = (b); \
+	                _a < _b ? _a : _b; })
+#		define MAX(a,b)	\
+	__extension__({ __auto_type _a = (a); \
+	                __auto_type _b = (b); \
+	                _a > _b ? _a : _b; })
+#	else
+/* typesafety but double evaluation is possible */
+#		define MIN(a,b)		\
+	__extension__({ __typeof__ (a) _a = (a); \
+	                __typeof__ (b) _b = (b); \
+	                _a < _b ? _a : _b; })
+#		define MAX(a,b)		\
+	__extension__({ __typeof__ (a) _a = (a); \
+	                __typeof__ (b) _b = (b); \
+	                _a > _b ? _a : _b; })
+#	endif
+#else
+/* no typesafety and double evaluation is possible */
+#	define MIN(a,b) ((a) < (b) ? (a) : (b))
+#	define MAX(a,b) ((a) > (b) ? (a) : (b))
+#endif
+
+#endif /* UTIL_H_ */
diff --git a/Core/Src/gpio.c b/Core/Src/gpio.c
index dfda8c3..8527541 100644
--- a/Core/Src/gpio.c
+++ b/Core/Src/gpio.c
@@ -51,7 +51,7 @@ void MX_GPIO_Init(void)
   __HAL_RCC_GPIOA_CLK_ENABLE();
 
   /*Configure GPIO pin Output Level */
-  HAL_GPIO_WritePin(SPI2_CS_GPIO_Port, SPI2_CS_Pin, GPIO_PIN_RESET);
+  HAL_GPIO_WritePin(SPI2_CS_GPIO_Port, SPI2_CS_Pin, GPIO_PIN_SET);
 
   /*Configure GPIO pin : PtPin */
   GPIO_InitStruct.Pin = SPI2_CS_Pin;
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 56a1310..49f388c 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -24,7 +24,9 @@
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
-
+#include "usbd_cdc_if.h"
+#include "bme280.h"
+#include "terminal.h"
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -65,7 +67,7 @@ void SystemClock_Config(void);
 int main(void)
 {
   /* USER CODE BEGIN 1 */
-
+	bme280_t bme280;
   /* USER CODE END 1 */
 
   /* MCU Configuration--------------------------------------------------------*/
@@ -89,17 +91,22 @@ int main(void)
   MX_SPI2_Init();
   MX_USB_DEVICE_Init();
   /* USER CODE BEGIN 2 */
-
+	bme280_init(&bme280, &hspi2, SPI2_CS_GPIO_Port, SPI2_CS_Pin);
   /* USER CODE END 2 */
 
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
-  while (1)
-  {
+	while(1)
+	{
+		term_printf("T: %f DegC, P: %f hPa, H: %f %%RH\r\n",
+		            (double) bme280_temp_get(&bme280) / 100.0,
+		            (double) bme280_press_get(&bme280) / 25600.0,
+		            (double) bme280_hum_get(&bme280) / 1024.0);
+		HAL_Delay(1000);
+	}
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
-  }
   /* USER CODE END 3 */
 }
 
diff --git a/Core/Src/spi.c b/Core/Src/spi.c
index 47a370a..23a72eb 100644
--- a/Core/Src/spi.c
+++ b/Core/Src/spi.c
@@ -44,7 +44,7 @@ void MX_SPI2_Init(void)
   hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
   hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
   hspi2.Init.NSS = SPI_NSS_SOFT;
-  hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
+  hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
   hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
   hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
   hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
diff --git a/Core/Src/terminal.c b/Core/Src/terminal.c
new file mode 100644
index 0000000..add8d85
--- /dev/null
+++ b/Core/Src/terminal.c
@@ -0,0 +1,136 @@
+/*
+ * terminal.c
+ *
+ *  Created on: Aug 2, 2022
+ *      Author: daniel.chokola
+ */
+
+/* Includes */
+#include <string.h>
+#include <stdarg.h>
+/*
+#include "config.h"
+*/
+#include "terminal.h"
+
+/* Private Variables */
+static char wbuf[TERM_RXBUF_LEN]; /* working buffer */
+static char rxbuf[TERM_RXBUF_LEN]; /* receive buffer */
+static uint32_t rxlen;
+static int8_t rxline;
+
+/* Function Prototypes */
+__attribute__((always_inline)) inline int8_t term_is_whitespace(char c)
+{
+	if(c == '\n' ||
+	   c == '\r' ||
+	   c == '\t' ||
+	   c == '\v' ||
+	   c == '\f' ||
+	   c == ' ')
+	{
+		return !0;
+	}
+
+	return 0;
+}
+static int32_t term_stripn(char *buf, int32_t n);
+
+/* Function Definitions */
+void term_prompt()
+{
+	/*
+	term_printf("\r%s-g%s $ ", APP_NAME, GIT_REV);
+	*/
+	term_printf("\r%s $ ", APP_NAME);
+}
+
+void term_rx(char *buf, uint32_t len)
+{
+	uint32_t i;
+	char c;
+
+	for(i = 0; i < len; i++)
+	{
+		c = buf[i];
+
+		/* ignore null bytes */
+		if(c == '\0')
+		{
+			continue;
+		}
+		/* handle backspace */
+		if(c == '\b')
+		{
+			if(rxlen)
+			{
+				rxlen--;
+			}
+			rxbuf[rxlen] = '\0';
+			if(rxlen)
+			{
+				/* term_printf("\b\x1b[0K"); */
+			}
+
+			continue;
+		}
+		/* handle escape sequences */
+		if(c == '\x1b')
+		{
+			c = '^';
+		}
+
+		rxbuf[rxlen++] = (char) c;
+		/* local echo */
+		/* term_printf("%c", c); */
+		if(c == '\n' || c == '\r')
+		{
+			/* EOL */
+			rxbuf[rxlen - 1] = '\0';
+			rxline = 1;
+		}
+	}
+}
+
+void term_printf(const char *fmt, ...)
+{
+	va_list args;
+	int32_t len;
+	uint8_t res;
+
+	va_start(args, fmt);
+	len = vsprintf(wbuf, fmt, args);
+	va_end(args);
+
+	/* FIXME: this will lock up if there's too much Tx/Rx traffic */
+	do
+	{
+		res = CDC_Transmit_FS((uint8_t *) wbuf, (uint16_t) len);
+	}
+	while(res == USBD_BUSY);
+}
+
+/* strip trailing whitespace from a string of length n */
+static int32_t term_stripn(char *buf, int32_t n)
+{
+	int32_t i = n - 1;
+
+	while(i >= 0)
+	{
+		if(term_is_whitespace(buf[i]))
+		{
+			buf[i--] = '\0';
+		}
+		else if(buf[i] == '\0')
+		{
+			i--;
+			continue;
+		}
+		else
+		{
+			break;
+		}
+	}
+
+	return i + 1;
+}
diff --git a/Drivers/BME280/Inc/bme280.h b/Drivers/BME280/Inc/bme280.h
new file mode 100755
index 0000000..b8797cd
--- /dev/null
+++ b/Drivers/BME280/Inc/bme280.h
@@ -0,0 +1,57 @@
+/*
+ * bme280.h
+ *
+ *  Created on: Feb 26, 2023
+ *  Author: Daniel Peter Chokola
+ *  License: Beerware - Use this code however you'd like. If you find it
+ *           useful you can buy me a beer some time.
+ */
+
+#ifndef BME280_H_
+#define BME280_H_
+
+/* Includes */
+#include <stdint.h>
+#include "spi.h"
+
+/* Definitions */
+#define BME280_CAL_LEN    (32u)
+
+/* Data Structures */
+typedef struct bme280_s {
+	SPI_HandleTypeDef *hspi;
+	GPIO_TypeDef *port;
+	uint16_t pin;
+	union __attribute__((packed, aligned(1))) bme280_calib_u {
+		uint8_t byte[BME280_CAL_LEN];
+		struct __attribute__((packed, aligned(1))) bme280_calib_s {
+			uint16_t cal_t1;
+			int16_t  cal_t2;
+			int16_t  cal_t3;
+			uint16_t cal_p1;
+			int16_t  cal_p2;
+			int16_t  cal_p3;
+			int16_t  cal_p4;
+			int16_t  cal_p5;
+			int16_t  cal_p6;
+			int16_t  cal_p7;
+			int16_t  cal_p8;
+			int16_t  cal_p9;
+			uint8_t  cal_h1;
+			int16_t  cal_h2;
+			uint8_t  cal_h3;
+			int16_t  cal_h4;
+			int16_t  cal_h5;
+			int8_t   cal_h6;
+		} field;
+	} cal;
+	int32_t t_fine;
+} bme280_t;
+
+/* Function Prototypes */
+int32_t bme280_init(bme280_t *bme280, SPI_HandleTypeDef *hspi, GPIO_TypeDef *port, uint16_t pin);
+int32_t bme280_temp_get(bme280_t *bme280);
+int32_t bme280_press_get(bme280_t *bme280);
+int32_t bme280_hum_get(bme280_t *bme280);
+
+#endif /* BME280_H_ */
diff --git a/Drivers/BME280/Src/bme280.c b/Drivers/BME280/Src/bme280.c
new file mode 100755
index 0000000..f8e6366
--- /dev/null
+++ b/Drivers/BME280/Src/bme280.c
@@ -0,0 +1,477 @@
+/*
+ * bme280.c
+ *
+ *  Created on: Feb 26, 2023
+ *      Author: Daniel Peter Chokola
+ *      License: Beerware - Use this code however you'd like. If you find it
+ *               useful you can buy me a beer some time.
+ */
+
+/* Includes */
+#include "bme280.h"
+#include "spi.h"
+#include "util.h"
+
+/* Definitions */
+/* BME280 registers */
+#define BME280_REG_HUM_LSB    (0xfe)
+#define BME280_REG_HUM_MSB    (0xfd)
+#define BME280_REG_TEMP_XLSB  (0xfc)
+#define BME280_REG_TEMP_LSB   (0xfb)
+#define BME280_REG_TEMP_MSB   (0xfa)
+#define BME280_REG_PRESS_XLSB (0xf9)
+#define BME280_REG_PRESS_LSB  (0xf8)
+#define BME280_REG_PRESS_MSB  (0xf7)
+#define BME280_REG_CONFIG     (0xf5)
+#define BME280_REG_CTRL_MEAS  (0xf4)
+#define BME280_REG_STATUS     (0xf3)
+#define BME280_REG_CTRL_HUM   (0xf2)
+#define BME280_REG_RESET      (0xe0)
+#define BME280_REG_ID         (0xd0) /* should return 0x60 when read (BME280) */
+#define BME280_REG_CALIB26    (0xe1)
+#define BME280_REG_CALIB25    (0xa1)
+#define BME280_REG_CALIB00    (0x88)
+/* BME280 SPI Register Masks */
+#define BME280_READ_MASK      (0x80)
+#define BME280_WRITE_MASK     (0x7f)
+/* BME280 Magic Register Values */
+#define BME280_RESET          (0xb6)
+#define BME280_ID             (0x60)
+#define BMP280_ID_PROD        (0x58)
+#define BMP280_ID_SAMP1       (0x56)
+#define BMP280_ID_SAMP2       (0x57)
+
+enum H_OSR {
+	H_OSR_00 = 0, /* skip */
+	H_OSR_01,
+	H_OSR_02,
+	H_OSR_04,
+	H_OSR_08,
+	H_OSR_16
+};
+enum P_OSR {
+	P_OSR_00 = 0, /* skip */
+	P_OSR_01,
+	P_OSR_02,
+	P_OSR_04,
+	P_OSR_08,
+	P_OSR_16
+};
+enum T_OSR {
+	T_OSR_00 = 0, /* skip */
+	T_OSR_01,
+	T_OSR_02,
+	T_OSR_04,
+	T_OSR_08,
+	T_OSR_16
+};
+enum IIR_COEFF {
+	IIR_OFF = 0, /* no filtering */
+	IIR_02,
+	IIR_04,
+	IIR_08,
+	IIR_16,
+};
+enum MODE {
+	MODE_SLEEP = 0,
+	MODE_FORCED1,
+	MODE_FORCED2,
+	MODE_NORMAL
+};
+enum STBY_TIME {
+	STBY_00_5ms = 0,
+	STBY_62_5ms,
+	STBY_125ms,
+	STBY_250ms,
+	STBY_500ms,
+	STBY_1000ms,
+	STBY_10ms,   /* 2000 ms on BMP280 */
+	STBY_20ms,   /* 4000 ms on BMP280 */
+};
+
+/* Data Structures */
+
+/* Function Prototypes */
+static int32_t bme280_cal_get(bme280_t *bme280);
+static int32_t bme280_writebyte(bme280_t *bme280, uint8_t reg, uint8_t byte);
+static int32_t bme280_readbyte(bme280_t *bme280, uint8_t reg, uint8_t *byte);
+static int32_t bme280_compensate_t(bme280_t *bme280, int32_t t);
+static uint32_t bme280_compensate_p(bme280_t *bme280, int32_t p_comp);
+static uint32_t bme280_compensate_h(bme280_t *bme280, int32_t h);
+
+/* Function Definitions */
+int32_t bme280_init(bme280_t *bme280, SPI_HandleTypeDef *hspi, GPIO_TypeDef *port, uint16_t pin)
+{
+	uint8_t id = 0;
+
+	return_val_if_fail(bme280, -1);
+	return_val_if_fail(hspi, -1);
+
+	bme280->hspi = hspi;
+	bme280->port = port;
+	bme280->pin  = pin;
+
+	/*
+	 * toggle CS line and send a dummy byte to to put the chip in SPI mode and
+	 * let the SPI lines settle */
+	return_val_if_fail(bme280_writebyte(bme280, BME280_REG_RESET, 0x00) == 0, -1);
+
+	/* reset */
+	return_val_if_fail(bme280_writebyte(bme280, BME280_REG_RESET, BME280_RESET) == 0, -1);
+	HAL_Delay(1); /* give the chip a millisecond to come out of reset */
+
+	/* query chip ID */
+	return_val_if_fail(bme280_readbyte(bme280, BME280_REG_ID, &id) == 0, -1);
+	switch(id)
+	{
+	case BME280_ID:
+		/* BME280 */
+		break;
+	case BMP280_ID_PROD:
+	case BMP280_ID_SAMP1:
+	case BMP280_ID_SAMP2:
+		/* maybe support these one day */
+	default:
+		return -1; /* not a BME280 */
+	}
+
+	/* fetch calibration constants */
+	return_val_if_fail(bme280_cal_get(bme280) == 0, -1);
+
+	/*
+	 * FIXME: don't hardcode these
+	 * Maybe leave the chip in sleep mode here and create new function(s) to
+	 * adjust config?
+	 */
+	/* configure humidity acquisition options */
+	return_val_if_fail(bme280_writebyte(bme280, BME280_REG_CTRL_HUM, H_OSR_01) == 0, -1);
+	/* configure temperature and pressure acquisition options and acquisition mode */
+	return_val_if_fail(bme280_writebyte(bme280,
+	                                    BME280_REG_CTRL_MEAS,
+	                                    (T_OSR_01 << 5) | (P_OSR_16 << 2) | MODE_NORMAL) == 0,
+	                   -1);
+	/* configure acquisition rate, IIR filtering, and SPI options */
+	return_val_if_fail(bme280_writebyte(bme280,
+	                                    BME280_REG_CONFIG,
+	                                    (STBY_00_5ms << 5) | (IIR_16 << 2) | 0) == 0,
+	                   -1);
+
+	return 0;
+}
+
+int32_t bme280_temp_get(bme280_t *bme280)
+{
+	uint8_t reg;
+	uint8_t rxdata[3];
+	int32_t t;
+	HAL_StatusTypeDef res;
+
+	/* read temperature; data must be read in one transaction to guarantee consistency */
+	reg = BME280_REG_TEMP_MSB;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(rxdata[0]), 3, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+
+	/* assemble raw temperature */
+	t = ((int32_t) rxdata[0] << 12) | ((uint32_t) rxdata[1] << 4) | ((uint32_t) rxdata[2] >> 4);
+
+	return bme280_compensate_t(bme280, t);
+}
+
+int32_t bme280_press_get(bme280_t *bme280)
+{
+	uint8_t reg;
+	uint8_t rxdata[3];
+	int32_t p;
+	HAL_StatusTypeDef res;
+
+	/* read pressure; data must be read in one transaction to guarantee consistency */
+	reg = BME280_REG_PRESS_MSB;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(rxdata[0]), 3, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+
+	/* assemble raw temperature */
+	p = ((int32_t) rxdata[0] << 12) | ((uint32_t) rxdata[1] << 4) | ((uint32_t) rxdata[2] >> 4);
+
+	return bme280_compensate_p(bme280, p);
+}
+
+int32_t bme280_hum_get(bme280_t *bme280)
+{
+	uint8_t reg;
+	uint8_t rxdata[2];
+	int32_t h;
+	HAL_StatusTypeDef res;
+
+	/* read pressure; data must be read in one transaction to guarantee consistency */
+	reg = BME280_REG_HUM_MSB;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(rxdata[0]), 2, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+
+	/* assemble raw temperature */
+	h = ((int32_t) rxdata[0] << 8) | rxdata[1];
+
+	return bme280_compensate_h(bme280, h);
+}
+
+static int32_t bme280_cal_get(bme280_t *bme280)
+{
+	uint8_t reg;
+	uint8_t calh[7];           /* humidity cal which needs some massaging */
+	int32_t i;
+	HAL_StatusTypeDef res;
+
+	for(i = 0; i < BME280_CAL_LEN; i++)
+	{
+		bme280->cal.byte[i] = 0;
+	}
+	reg = BME280_REG_CALIB00;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(bme280->cal.byte[ 0]), 24, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+	reg = BME280_REG_CALIB25;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(bme280->cal.byte[24]),  1, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+	reg = BME280_REG_CALIB26;
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &reg, 1, 10);
+	res |= HAL_SPI_Receive(bme280->hspi, &(calh[0]), 7, 10);
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+	/* massage the humidity cal into its struct */
+	bme280->cal.field.cal_h2 = ((int16_t) calh[1] << 8) | calh[0];
+	bme280->cal.field.cal_h3 = calh[2];
+	bme280->cal.field.cal_h4 = ((int16_t) calh[3] << 4) | (calh[4] & 0x0f);
+	bme280->cal.field.cal_h5 = ((int16_t) calh[5] << 4) | ((calh[4] >> 4) & 0x0f);
+	bme280->cal.field.cal_h6 = (int8_t) calh[6];
+
+	return 0;
+}
+
+static int32_t bme280_writebyte(bme280_t *bme280, uint8_t reg, uint8_t byte)
+{
+	uint8_t txdata[2] = { reg & BME280_WRITE_MASK, byte };
+	HAL_StatusTypeDef res;
+
+	/* assert chip select */
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_Transmit(bme280->hspi, &(txdata[0]), 2, 10);
+	/* deassert chip select */
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+
+	return 0;
+}
+
+static int32_t bme280_readbyte(bme280_t *bme280, uint8_t reg, uint8_t *byte)
+{
+	uint8_t txdata[2] = { reg | BME280_READ_MASK, 0x00 };
+	uint8_t rxdata[2];
+	HAL_StatusTypeDef res;
+
+	/* assert chip select */
+	bme280->port->BSRR = bme280->pin << 16;
+	res = HAL_SPI_TransmitReceive(bme280->hspi, &(txdata[0]), &(rxdata[0]), 2, 10);
+	/* deassert chip select */
+	bme280->port->BSRR = bme280->pin;
+	return_val_if_fail(res == HAL_OK, -1);
+	*byte = rxdata[1];
+
+	return 0;
+}
+
+/*
+ * Returns temperature in DegC, resolution is 0.01 DegC. Output value of
+ * "5123" equals 51.23 DegC.
+ */
+static int32_t bme280_compensate_t(bme280_t *bme280, int32_t t)
+{
+	int32_t var1;
+	int32_t var2;
+	int32_t t_comp;
+
+	var1 = ((((t >> 3) - ((int32_t) bme280->cal.field.cal_t1 << 1))) * ((int32_t) bme280->cal.field.cal_t2)) >> 11;
+	var2 = (((((t >> 4) - ((int32_t) bme280->cal.field.cal_t1)) * ((t >> 4) - ((int32_t) bme280->cal.field.cal_t1))) >> 12) * ((int32_t) bme280->cal.field.cal_t3)) >> 14;
+	bme280->t_fine = var1 + var2;
+	t_comp = (bme280->t_fine * 5 + 128) >> 8;
+
+	return t_comp;
+}
+
+/*
+ * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
+ * integer bits and 8 fractional bits).
+ * Output value of "24674867" represents 24674867/256 = 96386.2 Pa =
+ * 963.862 hPa
+ */
+static uint32_t bme280_compensate_p(bme280_t *bme280, int32_t p)
+{
+	int64_t var1;
+	int64_t var2;
+	int64_t p_comp;
+
+	var1 = ((int64_t) bme280->t_fine) - 128000;
+	var2 = var1 * var1 * (int64_t) bme280->cal.field.cal_p6;
+	var2 = var2 + ((var1 * (int64_t) bme280->cal.field.cal_p5) << 17);
+	var2 = var2 + (((int64_t) bme280->cal.field.cal_p4) << 35);
+	var1 = ((var1 * var1 * (int64_t) bme280->cal.field.cal_p3) >> 8) + ((var1 * (int64_t) bme280->cal.field.cal_p2) << 12);
+	var1 = (((((int64_t) 1) << 47) + var1)) * ((int64_t) bme280->cal.field.cal_p1) >> 33;
+	if(var1 == 0)
+	{
+		/* division by zero */
+		return 0;
+	}
+	p_comp = 1048576 - p;
+	p_comp = (((p_comp << 31) - var2) * 3125) / var1;
+	var1 = (((int64_t) bme280->cal.field.cal_p9) * (p_comp >> 13) * (p_comp >> 13)) >> 25;
+	var2 = (((int64_t) bme280->cal.field.cal_p8) * p_comp) >> 19;
+	p_comp = ((p_comp + var1 + var2) >> 8) + (((int64_t) bme280->cal.field.cal_p7) << 4);
+
+	return (uint32_t) p_comp;
+}
+
+/*
+ * Returns humidity in %RH as unsigned 32 bit integer in Q22.10 format (22
+ * integer and 10 fractional bits).
+ * Output value of “47445” represents 47445/1024 = 46.333 %RH
+ */
+static uint32_t bme280_compensate_h(bme280_t *bme280, int32_t h)
+{
+	int32_t h_comp;
+
+	h_comp = (bme280->t_fine - ((int32_t) 76800));
+	h_comp = (((((h << 14) - (((int32_t) bme280->cal.field.cal_h4) << 20) - (((int32_t) bme280->cal.field.cal_h5) *
+	h_comp)) + ((int32_t) 16384)) >> 15) * (((((((h_comp *
+	((int32_t) bme280->cal.field.cal_h6)) >> 10) * (((h_comp * ((int32_t) bme280->cal.field.cal_h3)) >> 11) +
+	((int32_t) 32768))) >> 10) + ((int32_t) 2097152)) * ((int32_t) bme280->cal.field.cal_h2) +
+	8192) >> 14));
+	h_comp = (h_comp - (((((h_comp >> 15) * (h_comp >> 15)) >> 7) *
+	((int32_t) bme280->cal.field.cal_h1)) >> 4));
+	h_comp = (h_comp < 0 ? 0 : h_comp);
+	h_comp = (h_comp > 419430400 ? 419430400 : h_comp);
+
+	return (uint32_t) (h_comp >> 12);
+}
+
+
+#if (0) /* crusty old code */
+/* Global Variables */
+/* Specify BME280 configuration */
+uint8_t Posr = P_OSR_16;
+uint8_t Tosr = T_OSR_02;
+uint8_t Mode = normal;
+uint8_t IIRFilter = BW0_042ODR;
+uint8_t SBy = t_62_5ms;     // set pressure and temperature output data rate
+/* t_fine carries fine temperature as global value for BME280 */
+int32_t t_fine;
+/* BME280 compensation parameters */
+uint16_t dig_T1, dig_P1;
+int16_t  dig_T2, dig_T3, dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
+double Temperature, Pressure; // stores BME280 pressures sensor pressure and temperature
+int32_t rawPress, rawTemp;   // pressure and temperature raw count output for BME280
+
+/* Function Definitions */
+int32_t readBME280Temperature()
+{
+	uint8_t rawData[3];  // 20-bit pressure register data stored here
+
+	HAL_I2C_Mem_Read(&hi2c1, BME280_ADDRESS, BME280_TEMP_MSB, 3, &rawData[0], 3, 10);
+
+	return (int32_t) (((int32_t) rawData[0] << 16 | (int32_t) rawData[1] << 8 | rawData[2]) >> 4);
+}
+
+int32_t readBME280Pressure()
+{
+	uint8_t rawData[3];  // 20-bit pressure register data stored here
+
+	HAL_I2C_Mem_Read(&hi2c1, BME280_ADDRESS, BME280_PRESS_MSB, 3, &rawData[0], 3, 10);
+
+	return (int32_t) (((int32_t) rawData[0] << 16 | (int32_t) rawData[1] << 8 | rawData[2]) >> 4);
+}
+
+void BME280Init()
+{
+	uint8_t TPosrMode = Tosr << 5 | Posr << 2 | Mode;
+	uint8_t SByTimeIntervalModeAndBandwidth = SBy << 5 | IIRFilter << 2;
+	uint8_t calib[24];
+
+	/* Configure the BME280 */
+	/* Set T and P oversampling rates and sensor mode */
+	HAL_I2C_Mem_Write(&hi2c1, BME280_ADDRESS, BME280_CTRL_MEAS, 1, &TPosrMode, 1, 10);
+	/* Set standby time interval in normal mode and bandwidth */
+	HAL_I2C_Mem_Write(&hi2c1, BME280_ADDRESS, BME280_CONFIG, 1, &SByTimeIntervalModeAndBandwidth, 1, 10);
+	/* Read and store calibration data */
+	HAL_I2C_Mem_Read(&hi2c1, BME280_ADDRESS, BME280_CALIB00, 24, &calib[0], 24, 10);
+	dig_T1 = (uint16_t) (((uint16_t) calib[ 1] << 8) | calib[ 0]);
+	dig_T2 = ( int16_t) ((( int16_t) calib[ 3] << 8) | calib[ 2]);
+	dig_T3 = ( int16_t) ((( int16_t) calib[ 5] << 8) | calib[ 4]);
+	dig_P1 = (uint16_t) (((uint16_t) calib[ 7] << 8) | calib[ 6]);
+	dig_P2 = ( int16_t) ((( int16_t) calib[ 9] << 8) | calib[ 8]);
+	dig_P3 = ( int16_t) ((( int16_t) calib[11] << 8) | calib[10]);
+	dig_P4 = ( int16_t) ((( int16_t) calib[13] << 8) | calib[12]);
+	dig_P5 = ( int16_t) ((( int16_t) calib[15] << 8) | calib[14]);
+	dig_P6 = ( int16_t) ((( int16_t) calib[17] << 8) | calib[16]);
+	dig_P7 = ( int16_t) ((( int16_t) calib[19] << 8) | calib[18]);
+	dig_P8 = ( int16_t) ((( int16_t) calib[21] << 8) | calib[20]);
+	dig_P9 = ( int16_t) ((( int16_t) calib[23] << 8) | calib[22]);
+}
+
+/*
+ * Returns temperature in DegC, resolution is 0.01 DegC. Output value of
+ * "5123" equals 51.23 DegC.
+ */
+int32_t bmp280_compensate_T(int32_t adc_T)
+{
+	int32_t var1, var2, T;
+
+	var1 = ((((adc_T >> 3) - ((int32_t) dig_T1 << 1))) * ((int32_t) dig_T2)) >> 11;
+	var2 = (((((adc_T >> 4) - ((int32_t) dig_T1)) * ((adc_T >> 4) - ((int32_t) dig_T1))) >> 12) * ((int32_t) dig_T3)) >> 14;
+	t_fine = var1 + var2;
+	T = (t_fine * 5 + 128) >> 8;
+
+	return T;
+}
+
+/*
+ * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
+ * integer bits and 8 fractional bits).
+ * Output value of "24674867" represents 24674867/256 = 96386.2 Pa =
+ * 963.862 hPa
+ */
+uint32_t bmp280_compensate_P(int32_t adc_P)
+{
+	uint64_t var1, var2, p;
+
+	var1 = ((uint64_t) t_fine) - 128000;
+	var2 = var1 * var1 * (uint64_t) dig_P6;
+	var2 = var2 + ((var1 * (uint64_t) dig_P5) << 17);
+	var2 = var2 + (((uint64_t) dig_P4) << 35);
+	var1 = ((var1 * var1 * (uint64_t) dig_P3) >> 8) + ((var1 * (uint64_t) dig_P2) << 12);
+	var1 = (((((uint64_t) 1) << 47) + var1)) * ((uint64_t) dig_P1) >> 33;
+	if(var1 == 0)
+	{
+		/* division by zero */
+		return 0;
+	}
+	p = 1048576 - adc_P;
+	p = (((p << 31) - var2) * 3125) / var1;
+	var1 = (((uint64_t) dig_P9) * (p >> 13) * (p >> 13)) >> 25;
+	var2 = (((uint64_t) dig_P8) * p)>> 19;
+	p = ((p + var1 + var2) >> 8) + (((uint64_t) dig_P7) << 4);
+
+	return (uint32_t) p;
+}
+#endif /* crusty old code */
diff --git a/hothouse-mon.ioc b/hothouse-mon.ioc
index 23661df..4a4d5ae 100644
--- a/hothouse-mon.ioc
+++ b/hothouse-mon.ioc
@@ -55,9 +55,11 @@ PA13.Mode=Serial_Wire
 PA13.Signal=SYS_JTMS-SWDIO
 PA14.Mode=Serial_Wire
 PA14.Signal=SYS_JTCK-SWCLK
-PB12.GPIOParameters=GPIO_Label
+PB12.GPIOParameters=GPIO_Speed,PinState,GPIO_Label
 PB12.GPIO_Label=SPI2_CS
+PB12.GPIO_Speed=GPIO_SPEED_FREQ_LOW
 PB12.Locked=true
+PB12.PinState=GPIO_PIN_SET
 PB12.Signal=GPIO_Output
 PB13.Locked=true
 PB13.Mode=Full_Duplex_Master
@@ -102,7 +104,7 @@ ProjectManager.StackSize=0x400
 ProjectManager.TargetToolchain=STM32CubeIDE
 ProjectManager.ToolChainLocation=
 ProjectManager.UnderRoot=true
-ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false
+ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_SPI2_Init-SPI2-false-HAL-true,4-MX_USB_DEVICE_Init-USB_DEVICE-false-HAL-false
 RCC.48MHZClocksFreq_Value=48000000
 RCC.AHBFreq_Value=72000000
 RCC.APB1CLKDivider=RCC_HCLK_DIV2
@@ -131,9 +133,10 @@ RCC.VCOI2SOutputFreq_Value=192000000
 RCC.VCOInputFreq_Value=1000000
 RCC.VCOOutputFreq_Value=144000000
 RCC.VcooutputI2S=96000000
-SPI2.CalculateBaudRate=18.0 MBits/s
+SPI2.BaudRatePrescaler=SPI_BAUDRATEPRESCALER_4
+SPI2.CalculateBaudRate=9.0 MBits/s
 SPI2.Direction=SPI_DIRECTION_2LINES
-SPI2.IPParameters=VirtualType,Mode,Direction,CalculateBaudRate
+SPI2.IPParameters=VirtualType,Mode,Direction,CalculateBaudRate,BaudRatePrescaler
 SPI2.Mode=SPI_MODE_MASTER
 SPI2.VirtualType=VM_MASTER
 USB_DEVICE.CLASS_NAME_FS=CDC