166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
#include "sht30.h"
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#include "i2c.h"
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#include "pdebug.h"
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#include "assertions.h"
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#include "filter.h"
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#include "cmsis_os.h"
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#if 0
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stTempHumiSensor g_stTempHumiSensor={
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.i2c_reg_addr = 0x44<<1,
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.cmd_init_mode = 0x2320, //repeat medium_4
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.cmd_read_data = 0xe000,
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};
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#endif
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stTempHumiSensor g_stTempHumiSensor={
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.i2c_reg_addr = 0x44<<1,
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.cmd_init_mode = 0x2c06,
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.cmd_read_data = 0x2c06,
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};
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stTempHumiData g_stTempHumiData;
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/**
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* @brief 写命令，（两个命令时间间隔至少1ms）
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* @param
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* @retval
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*/
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static u_int8_t i2c_write_cmd(u_int8_t addr,u_int16_t cmd)
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{
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u_int8_t cmd_buff[2]={0x00};
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cmd_buff[0] = cmd>>8;
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cmd_buff[1] = cmd;
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u_int8_t ret = HAL_I2C_Master_Transmit(&hi2c1,addr,cmd_buff,2,0xffff);
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return ret;
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}
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/**
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* @brief CRC校验
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* @param
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* @retval
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*/
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#define CRC8_POLYNOMIAL 0x31
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u_int8_t CheckCrc8(u_int8_t* message, u_int8_t initial_value)
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{
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u_int8_t remainder;
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u_int8_t i = 0, j = 0;
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remainder = initial_value;
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for(j = 0; j < 2;j++){
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remainder ^= message[j];
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for (i = 0; i < 8; i++){
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if (remainder & 0x80){
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remainder = (remainder << 1)^CRC8_POLYNOMIAL;
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} else {
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remainder = (remainder << 1);
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}
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}
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}
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return remainder;
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}
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/**
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* @brief 初始化代码
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* @param
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* @retval
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*/
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u_int8_t sht30_init()
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{
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float temp,humi;
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// soft reset
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// i2c_write_cmd(0x30a2);
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// HAL_Delay(25);
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HAL_GPIO_WritePin(GPIOB, GPIO_SHT_PWR_EN_Pin, GPIO_PIN_SET);
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HAL_Delay(1);
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//u_int8_t ret = i2c_write_cmd(g_stTempHumiSensor.i2c_reg_addr, g_stTempHumiSensor.cmd_init_mode);
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AssertError(get_temp_humi_data(&temp, &humi),return 0,"!!!Sensor Sht30 Check Failed" );
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term_printf("Sensor Sht30 Check OK.\r\n Temp:%.2f,Humi:%.2f\r\n", temp,humi);
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return 0;
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}
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/**
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* @brief 温湿度数据采集
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* @param
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* @retval
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*/
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u_int8_t sht30_collect_data(stTempHumiSensor stSensorDev, float *temp, float *humi)
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{
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u_int8_t read_buff[6] = {0};
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u_int16_t temp_value;
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u_int16_t humi_value;
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i2c_write_cmd(stSensorDev.i2c_reg_addr,stSensorDev.cmd_read_data);
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if(HAL_I2C_Master_Receive(&hi2c1,stSensorDev.i2c_reg_addr,read_buff,6,0xffff) != HAL_OK){
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return HAL_ERROR;
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}
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if(CheckCrc8(read_buff, 0xFF) != read_buff[2] && CheckCrc8(&read_buff[3], 0xFF) != read_buff[5]){
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return HAL_ERROR;
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}
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temp_value = ((u_int16_t)read_buff[0]<<8)|read_buff[1];
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*temp = -45 + 175*((float)temp_value/65535);
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humi_value = ((u_int16_t)read_buff[3]<<8)|read_buff[4];
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*humi = 100 * ((float)humi_value / 65535);
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return HAL_OK;
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}
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/**
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* @brief 获取温湿度数据
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* @param
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* @retval
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*/
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#define COLLECT_DATA_NUM 10
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BOOL get_temp_humi_data(float* temdata, float* humidata)
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{
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U_DataType collect_temdata[30]={0x00};
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U_DataType collect_humidata[30]={0x00};
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U_DataType tmp_temdata,tmp_humidata;
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for(int i=0; i<COLLECT_DATA_NUM; i++){
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int ret = sht30_collect_data(g_stTempHumiSensor,&collect_temdata[i].fValue, &collect_humidata[i].fValue);
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AssertError(ret == HAL_OK, return FALSE, "sht30采样失败");
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osDelay(1);
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}
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tmp_temdata = filter_middle(collect_temdata,COLLECT_DATA_NUM, FILTER_DATA_TYPE_FLOAT);
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tmp_humidata = filter_middle(collect_humidata,COLLECT_DATA_NUM, FILTER_DATA_TYPE_FLOAT);
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AssertError((tmp_temdata.fValue >= -40) && (tmp_temdata.fValue <= 85), return FALSE, "sht30温度值校验失败");
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AssertError((tmp_humidata.fValue >= 0) && (tmp_humidata.fValue <= 100), return FALSE, "sht30湿度值校验失败");
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*temdata = tmp_temdata.fValue;
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*humidata = tmp_humidata.fValue;
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//g_stTempHumiData.temp = tmp_temdata.fValue;
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//g_stTempHumiData.humi = tmp_humidata.fValue;
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return TRUE;
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}
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#if 0
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/**
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* @brief 测试用例
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* @param
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* @retval
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*/
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void TEST_read_sht30_value()
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{
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float temp,humi;
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AssertError(get_temp_humi_data(&temp, &humi),return,"采集sht30温湿度数据失败" );
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term_printf("temp:%.2f, humi:%.2f\r\n", temp, humi);
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}
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#endif
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