124 lines
3.4 KiB
C
Executable File
124 lines
3.4 KiB
C
Executable File
#include "stm32l4xx_hal.h"
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#include "HTS221.h"
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extern I2C_HandleTypeDef hi2c2;
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//Estructura para almacenar la calibración
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typedef struct{
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//Valores de los registros
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float H0_rH_x2;
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float H1_rH_x2;
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float T0_degC_x8;
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float T1_degC_x8;
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int16_t H0_T0_OUT;
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int16_t H1_T0_OUT;
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int16_t T0_OUT;
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int16_t T1_OUT;
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//Rectas de calibración para humedad y temperatura
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float ha, hb;
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float ta, tb;
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} HTS_Calibration;
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//Instancia de la calibración
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HTS_Calibration hts_cal;
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// Direcciones de los registros
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#define I2C_TH 0xBE
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#define HTS_H0_rH_x2 0x30
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#define HTS_H1_rH_x2 0x31
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#define HTS_T0_degC_x8 0x32
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#define HTS_T1_degC_x8 0x33
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#define HTS_T1_T0_MSB 0x35
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#define HTS_H0_T0_OUT_LSB 0x36
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#define HTS_H0_T0_OUT_MSB 0x37
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#define HTS_H1_T0_OUT_LSB 0x3A
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#define HTS_H1_T0_OUT_MSB 0x3B
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#define HTS_T0_OUT_LSB 0x3C
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#define HTS_T0_OUT_MSB 0x3D
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#define HTS_T1_OUT_LSB 0x3E
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#define HTS_T1_OUT_MSB 0x3F
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void HTS221_UpdateCalibration(){
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uint8_t buffer;
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uint8_t tempMSB;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H0_rH_x2, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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hts_cal.H0_rH_x2 = buffer / 2.0f;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H1_rH_x2, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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hts_cal.H1_rH_x2 = buffer / 2.0f;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T1_T0_MSB, I2C_MEMADD_SIZE_8BIT, &tempMSB, 1, 1000);
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T0_degC_x8, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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hts_cal.T0_degC_x8 = (((tempMSB & 0x03) <<8) | buffer) / 8.0f ;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T1_degC_x8, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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hts_cal.T1_degC_x8 = (((tempMSB & 0x0C) <<6) | buffer) / 8.0f ;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H0_T0_OUT_LSB, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H0_T0_OUT_MSB, I2C_MEMADD_SIZE_8BIT, &tempMSB, 1, 1000);
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hts_cal.H0_T0_OUT = (tempMSB <<8) | buffer;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H1_T0_OUT_LSB, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_H1_T0_OUT_MSB, I2C_MEMADD_SIZE_8BIT, &tempMSB, 1, 1000);
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hts_cal.H1_T0_OUT = (tempMSB <<8) | buffer;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T0_OUT_LSB, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T0_OUT_MSB, I2C_MEMADD_SIZE_8BIT, &tempMSB, 1, 1000);
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hts_cal.T0_OUT = (tempMSB <<8) | buffer;
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T1_OUT_LSB, I2C_MEMADD_SIZE_8BIT, &buffer, 1, 1000);
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HAL_I2C_Mem_Read(&hi2c2, I2C_TH, HTS_T1_OUT_MSB, I2C_MEMADD_SIZE_8BIT, &tempMSB, 1, 1000);
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hts_cal.T1_OUT = (tempMSB <<8) | buffer;
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hts_cal.ha = (hts_cal.H1_rH_x2 - hts_cal.H0_rH_x2) / (hts_cal.H1_T0_OUT - hts_cal.H0_T0_OUT);
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hts_cal.hb = hts_cal.H0_rH_x2 - hts_cal.ha*hts_cal.H0_T0_OUT;
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hts_cal.ta = (hts_cal.T1_degC_x8 - hts_cal.T0_degC_x8) / (hts_cal.T1_OUT - hts_cal.T0_OUT);
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hts_cal.tb = hts_cal.T0_degC_x8 - hts_cal.ha*hts_cal.T0_OUT;
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}
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void HTS221_Init() {
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uint8_t buffer[1];
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buffer[0] = 0x87;
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HAL_I2C_Mem_Write(&hi2c2, 0xBE, 0x20, I2C_MEMADD_SIZE_8BIT, buffer, 1, 1000);
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HTS221_UpdateCalibration();
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}
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THSample HTS221_Read() {
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THSample ths;
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uint8_t buffer[4];
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HAL_I2C_Mem_Read(&hi2c2, 0xBE, 0x80 | 0x28, I2C_MEMADD_SIZE_8BIT, buffer, 4, 1000);
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int16_t hum_raw;
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int16_t temp_raw;
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hum_raw = (buffer[1] << 8) | buffer[0];
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temp_raw = (buffer[3] << 8) | buffer[2];
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ths.hum = hts_cal.ha * hum_raw + hts_cal.hb;
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ths.temp = hts_cal.ta * temp_raw + hts_cal.tb;
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return ths;
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return ths;
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}
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