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78 lines
2.3 KiB
78 lines
2.3 KiB
/* |
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* lps22hb.c |
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* The LPS22HB is a low power barometer, here used as 1 DoF in a 10 DoF |
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* absolute orientation solution. |
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* |
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* Created on: Jan 18, 2021 |
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* Author: Daniel Peter Chokola |
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* |
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* Adapted From: |
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* EM7180_LSM6DSM_LIS2MDL_LPS22HB_Butterfly |
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* by: Kris Winer |
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* 09/23/2017 Copyright Tlera Corporation |
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* |
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* Library may be used freely and without limit with attribution. |
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*/ |
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/* Includes */ |
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#include <stdint.h> |
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#include "em7180_common.h" |
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#include "lps22hb.h" |
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/* Private Global Variables */ |
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/* Function Prototypes */ |
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/* Function Definitions */ |
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void lps22hb_init(lps22hb_t *lps22hb, uint8_t p_odr) |
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{ |
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return_if_fail(lps22hb); |
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lps22hb->p_odr = p_odr; |
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} |
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void lps22hb_config(lps22hb_t *lps22hb, I2C_HandleTypeDef *hi2c) |
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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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broken_i2c_write_byte(hi2c, LPS22H_ADDRESS, LPS22H_CTRL_REG1, |
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lps22hb->p_odr << 4 | 0x08 | 0x02); |
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broken_i2c_write_byte(hi2c, LPS22H_ADDRESS, LPS22H_CTRL_REG3, 0x04); // enable data ready as interrupt source |
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} |
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uint8_t lps22hb_chip_id_get(I2C_HandleTypeDef *hi2c) |
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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 = broken_i2c_read_byte(hi2c, 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 lps22hb_status(I2C_HandleTypeDef *hi2c) |
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{ |
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// Read the status register of the altimeter |
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uint8_t temp = broken_i2c_read_byte(hi2c, LPS22H_ADDRESS, LPS22H_STATUS); |
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return temp; |
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} |
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int32_t lps22hb_pressure_get(I2C_HandleTypeDef *hi2c) |
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{ |
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uint8_t data[3]; // 24-bit pressure register data stored here |
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broken_i2c_read(hi2c, LPS22H_ADDRESS, (LPS22H_PRESS_OUT_XL | 0x80), data, |
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3); // bit 7 must be one to read multiple bytes |
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return ((int32_t) data[2] << 16 | (int32_t) data[1] << 8 | data[0]); |
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} |
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int16_t lps22hb_temp_get(I2C_HandleTypeDef *hi2c) |
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{ |
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uint8_t data[2]; // 16-bit pressure register data stored here |
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broken_i2c_read(hi2c, LPS22H_ADDRESS, (LPS22H_TEMP_OUT_L | 0x80), data, 2); // bit 7 must be one to read multiple bytes |
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return ((int16_t) data[1] << 8 | data[0]); |
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}
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