79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#include "tmp117.h"
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#include "i2c.h"
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#include "cmsis_os.h"
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// 初始化温度传感器
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HAL_StatusTypeDef TMP117_Init(void)
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{
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// 配置值：
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uint8_t config_data[2] = {0x0C, 0x00}; // 高字节在前,单次转换，1100 0000 0000，12.5ms
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return HAL_I2C_Mem_Write(&hi2c1, TMP117_ADDR << 1, TMP117_CONFIG_REG,
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I2C_MEMADD_SIZE_8BIT, config_data, 2, 100);
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}
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// 从寄存器读取双字节数据
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HAL_StatusTypeDef TMP117_Read(uint8_t reg, uint8_t *buffer) {
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return HAL_I2C_Mem_Read(&hi2c1, TMP117_ADDR << 1, reg,
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I2C_MEMADD_SIZE_8BIT, buffer, 2, 100);
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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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// 获取温度值（单位：℃）
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#define COLLECT_DATA_NUM 10
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HAL_StatusTypeDef TMP117_Get_Temp(float *temp)
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{
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uint8_t raw_data[2] = {0};
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int16_t temp_raw;
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uint8_t ret_falt = 0;
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float ret_temp;
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float temp_temp[COLLECT_DATA_NUM] = {0};
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for(int i = 0; i<COLLECT_DATA_NUM; i++)
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{
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TMP117_Init();
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osDelay(20);
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if(TMP117_Read(TMP117_TEMP_REG, raw_data) != HAL_OK)
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{
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ret_falt++;
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temp_temp[i] = 0;
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}else
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{
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temp_raw = (raw_data[0] << 8) | raw_data[1];
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temp_temp[i] = temp_raw * 0.0078125f;
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}
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}
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if(ret_falt >= COLLECT_DATA_NUM)
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{
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*temp = 0;
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return HAL_ERROR;
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}
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ret_temp = calculateAverage(temp_temp, COLLECT_DATA_NUM - ret_falt);
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if(ret_temp <= -60)
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{
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*temp = -60;
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}else if(ret_temp >= 150)
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{
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*temp = 150;
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}else
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{
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*temp = ret_temp;
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}
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return HAL_OK;
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}
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