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60 lines
1.9 KiB
60 lines
1.9 KiB
/* 09/23/2017 Copyright Tlera Corporation |
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Created by Kris Winer |
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This sketch uses SDA/SCL on pins 21/20 (Butterfly default), respectively, and it uses the Butterfly STM32L433CU Breakout Board. |
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The LPS22HB is a low power barometerr. |
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Library may be used freely and without limit with attribution. |
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*/ |
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#include "LPS22HB.h" |
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#include "Wire.h" |
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LPS22H::LPS22H(uint8_t intPin, I2Cdev* i2c_bus) |
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{ |
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_intPin = intPin; |
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_i2c_bus = i2c_bus; |
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} |
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uint8_t LPS22H::getChipID() |
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{ |
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// Read the WHO_AM_I register of the altimeter this is a good test of communication |
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uint8_t temp = _i2c_bus->readByte(LPS22H_ADDRESS, LPS22H_WHOAMI); // Read WHO_AM_I register for LPS22H |
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return temp; |
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} |
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uint8_t LPS22H::status() |
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{ |
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// Read the status register of the altimeter |
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uint8_t temp = _i2c_bus->readByte(LPS22H_ADDRESS, LPS22H_STATUS); |
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return temp; |
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} |
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int32_t LPS22H::readAltimeterPressure() |
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{ |
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uint8_t rawData[3]; // 24-bit pressure register data stored here |
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_i2c_bus->readBytes(LPS22H_ADDRESS, (LPS22H_PRESS_OUT_XL | 0x80), 3, &rawData[0]); // bit 7 must be one to read multiple bytes |
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return (int32_t) ((int32_t) rawData[2] << 16 | (int32_t) rawData[1] << 8 | rawData[0]); |
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} |
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int16_t LPS22H::readAltimeterTemperature() |
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{ |
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uint8_t rawData[2]; // 16-bit pressure register data stored here |
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_i2c_bus->readBytes(LPS22H_ADDRESS, (LPS22H_TEMP_OUT_L | 0x80), 2, &rawData[0]); // bit 7 must be one to read multiple bytes |
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return (int16_t)((int16_t) rawData[1] << 8 | rawData[0]); |
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} |
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void LPS22H::Init(uint8_t PODR) |
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{ |
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// set sample rate by setting bits 6:4 |
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// enable low-pass filter by setting bit 3 to one |
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// bit 2 == 0 means bandwidth is odr/9, bit 2 == 1 means bandwidth is odr/20 |
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// make sure data not updated during read by setting block data udate (bit 1) to 1 |
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_i2c_bus->writeByte(LPS22H_ADDRESS, LPS22H_CTRL_REG1, PODR << 4 | 0x08 | 0x02); |
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_i2c_bus->writeByte(LPS22H_ADDRESS, LPS22H_CTRL_REG3, 0x04); // enable data ready as interrupt source |
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} |
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