da5884920a
1. modified the HTS221: removed magic numbers, added a sensor_tempnhumi_t struct to accommodate temperature and humidity data 2. added .h and .c files for LIS3MDL magnetic sensor 3. added .h and .c files for LPS22HB pressure sensor 3. added IAR (EWARM) project for lorawan example 4. added bsp.c and bsp.h to manager the sensors
80 lines
3.2 KiB
C
80 lines
3.2 KiB
C
/**
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******************************************************************************
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* @file LPS22HB.c
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* @author jieranzhi
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* @update 2020/03/23 19:00 CST
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* @brief This file provides code for the LPS22HB Initialization
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* and data output codes.
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******************************************************************************
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* @attention
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*
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* 1. this code is used as one of the examples in TencentOS_tiny project, it's
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* just a simple implementation of the sensor functionalities, to implement
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* more functions, please refer to the datasheet or the official software
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* package provided by ST (STM32CubeExpansion_LRWAN_V1.3.1)
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*
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* 2. in this file the host MCU need to read the output persistently, which is
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* not of power efficient, to achieve better power consumption performance,
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* it is recommended to use FIFO.
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*
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******************************************************************************
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*/
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#include <LPS22HB.h>
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#include <i2c.h>
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// initialization of LPS22HB
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void LPS22HB_Init()
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{
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uint8_t cmd = 0;
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// reset the Low-power mode configuration
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cmd = 0x00;
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HAL_I2C_Mem_Write(&hi2c1, LPS22HB_ADDR_WR, LPS22HB_RES_CONF_REG, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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// setup data rate(power down, 000); disable lowpass filter (we use one-shot in this case); Block data update(continuous)
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cmd = 0x00;
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HAL_I2C_Mem_Write(&hi2c1, LPS22HB_ADDR_WR, LPS22HB_CTRL_REG1, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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// reboot mode(normal); disable FIFO; enable IF_ADD_INC; enable I2C; software reset mode(normal); one-shot mode(idle)
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cmd = 0x10;
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HAL_I2C_Mem_Write(&hi2c1, LPS22HB_ADDR_WR, LPS22HB_CTRL_REG2, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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// interupt control: set to default value (0x00)
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cmd = 0x00;
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HAL_I2C_Mem_Write(&hi2c1, LPS22HB_ADDR_WR, LPS22HB_CTRL_REG3, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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}
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// enable one-shot to start a new acquisition (conversion)
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static void LPS22HB_Start()
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{
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uint8_t cmd = 0;
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HAL_I2C_Mem_Read(&hi2c1, LPS22HB_ADDR_RD, LPS22HB_CTRL_REG2, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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cmd |= 0x01;
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HAL_I2C_Mem_Write(&hi2c1, LPS22HB_ADDR_WR, LPS22HB_CTRL_REG2, I2C_MEMADD_SIZE_8BIT, &cmd, 1, 0xFFFF);
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}
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// start a new acquisition by enabling the one-shot bit in the LPS22HB_CTRL_REG2
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// and read the pressure from the sensor
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uint8_t LPS22HB_Get_Press(sensor_press_t* press_sensor)
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{
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uint8_t status_dat = 0;
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uint8_t pressure_out_l = 0;
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uint8_t pressure_out_h = 0;
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uint8_t pressure_out_xl = 0;
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press_sensor->sensitivity = 4096;
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LPS22HB_Start();
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while((status_dat&LPS22HB_P_DA) != LPS22HB_P_DA)
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{
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HAL_I2C_Mem_Read(&hi2c1, LPS22HB_ADDR_RD, LPS22HB_STATUS_REG, I2C_MEMADD_SIZE_8BIT, &status_dat, 1, 0xFFFF);
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}
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HAL_I2C_Mem_Read(&hi2c1, LPS22HB_ADDR_RD, LPS22HB_PRESS_OUT_XL, I2C_MEMADD_SIZE_8BIT, &pressure_out_xl, 1, 0xFFFF);
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HAL_I2C_Mem_Read(&hi2c1, LPS22HB_ADDR_RD, LPS22HB_PRESS_OUT_L, I2C_MEMADD_SIZE_8BIT, &pressure_out_l, 1, 0xFFFF);
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HAL_I2C_Mem_Read(&hi2c1, LPS22HB_ADDR_RD, LPS22HB_PRESS_OUT_H, I2C_MEMADD_SIZE_8BIT, &pressure_out_h, 1, 0xFFFF);
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press_sensor->pressure = (((uint32_t)pressure_out_h<<16) | ((uint16_t)pressure_out_l<<8) | pressure_out_xl);
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return 0;
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}
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