241 lines
5.4 KiB
C
241 lines
5.4 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,2,0xff);
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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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uint8_t ret;
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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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ret = get_temp_humi_data(&temp, &humi);
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if(ret == TRUE)
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term_printf("Sensor Sht30 Check OK.\r\n Temp:%.2f,Humi:%.2f\r\n", temp,humi);
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else
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// term_printf("Sensor Sht30 Check Err.\r\n");
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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,6,0xff) != 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 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 sht45_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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uint8_t _cmd[] = {0xFD};
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u_int16_t temp_value;
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u_int16_t humi_value;
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HAL_I2C_Master_Transmit(&hi2c1,stSensorDev.i2c_reg_addr,_cmd,1,0xff);
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osDelay(15);
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if(HAL_I2C_Master_Receive(&hi2c1,stSensorDev.i2c_reg_addr,read_buff,6,0xff) != 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 = -6 + 125*((float)humi_value / 65535);
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return HAL_OK;
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}
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static float calculateAverage(float arr[], int avgLength) {
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float sum = 0;
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// 遍历数组（最多10个元素），收集非零值直到达到指定数量
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for (int i = 0; i < 10; ++i) {
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sum += arr[i];
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}
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// 计算平均值并限制最大值
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float average = sum / avgLength;
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return average;
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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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HAL_StatusTypeDef get_temp_humi_data(float* temdata, float* humidata)
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{
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float collect_temdata[COLLECT_DATA_NUM] = {0};
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float collect_humidata[COLLECT_DATA_NUM] = {0};
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float tmp_temdata,tmp_humidata;
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uint8_t ret_falt = 0;
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for(int i=0; i<COLLECT_DATA_NUM; i++){
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if(sht45_collect_data(g_stTempHumiSensor,&collect_temdata[i], &collect_humidata[i]) == HAL_ERROR)
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{
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ret_falt++;
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collect_temdata[i] = 0;
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collect_humidata[i] = 0;
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}
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osDelay(1);
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}
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if(ret_falt >= COLLECT_DATA_NUM)
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{
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goto error_return;
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}
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tmp_temdata = calculateAverage(collect_temdata,COLLECT_DATA_NUM - ret_falt);
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tmp_humidata = calculateAverage(collect_humidata,COLLECT_DATA_NUM - ret_falt);
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if(tmp_temdata < -50.0)
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{
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tmp_temdata = -50.0;
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}
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if(tmp_temdata > 125.0)
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{
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tmp_temdata = 125.0;
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}
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if(tmp_humidata < 0.0)
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{
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tmp_humidata = 0.0;
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}
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if(tmp_humidata > 100.0)
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{
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tmp_humidata = 100.0;
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}
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*temdata = tmp_temdata;
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*humidata = tmp_humidata;
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return HAL_OK;
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error_return:
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*temdata = 0;
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*humidata = 0;
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return HAL_ERROR;
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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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