- #define SHT30_ADDR_WRITE 0x44<<1 //10001000，根据用户手册的指示，这个就是SHT30的写入地址
- #define SHT30_ADDR_READ (0x44<<1)+1 //10001011，根据用户手册的指示，这个就是SHT30的读取地址
- extern I2C_HandleTypeDef hi2c1;//开启I2C1的接口，你用的哪个就改哪个
-
- typedef enum //命令的定义
- {
- /* 软件复位命令 */
-
- SOFT_RESET_CMD = 0x30A2,
- /*
- 单次测量模式
- 命名格式：Repeatability_CS_CMD
- CS： Clock stretching
- */
- HIGH_ENABLED_CMD = 0x2C06,
- MEDIUM_ENABLED_CMD = 0x2C0D,
- LOW_ENABLED_CMD = 0x2C10,
- HIGH_DISABLED_CMD = 0x2400,
- MEDIUM_DISABLED_CMD = 0x240B,
- LOW_DISABLED_CMD = 0x2416,
-
- /*
- 周期测量模式
- 命名格式：Repeatability_MPS_CMD
- MPS：measurement per second
- */
- HIGH_0_5_CMD = 0x2032,
- MEDIUM_0_5_CMD = 0x2024,
- LOW_0_5_CMD = 0x202F,
- HIGH_1_CMD = 0x2130,
- MEDIUM_1_CMD = 0x2126,
- LOW_1_CMD = 0x212D,
- HIGH_2_CMD = 0x2236,
- MEDIUM_2_CMD = 0x2220,
- LOW_2_CMD = 0x222B,
- HIGH_4_CMD = 0x2334,
- MEDIUM_4_CMD = 0x2322,
- LOW_4_CMD = 0x2329,
- HIGH_10_CMD = 0x2737,
- MEDIUM_10_CMD = 0x2721,
- LOW_10_CMD = 0x272A,
- /* 周期测量模式读取数据命令 */
- READOUT_FOR_PERIODIC_MODE = 0xE000,
- } SHT30_CMD;
-
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] 向SHT30发送一条指令(16bit)
- * @param cmd —— SHT30指令（在SHT30_MODE中枚举定义）
- * @retval 成功返回HAL_OK
- */
- static uint8_t SHT30_Send_Cmd(SHT30_CMD cmd)
- {
- uint8_t cmd_buffer[2];
- cmd_buffer[0] = cmd >> 8;
- cmd_buffer[1] = cmd;
- return HAL_I2C_Master_Transmit(&hi2c1, SHT30_ADDR_WRITE, (uint8_t*)cmd_buffer, 2, 0xFFFF);
- }
-
- /**
- * @brief 复位SHT30
- * @param none
- * @retval none
- */
- void SHT30_Reset(void)
- {
- SHT30_Send_Cmd(SOFT_RESET_CMD);
- HAL_Delay(20);
- }
-
- /**
- * @brief 初始化SHT30
- * @param none
- * @retval 成功返回HAL_OK
- * [url=home.php?mod=space&uid=536309]@NOTE[/url] 周期测量模式
- */
- uint8_t SHT30_Init(void)
- {
- return SHT30_Send_Cmd(MEDIUM_2_CMD);
- }
-
- /**
- * @brief 从SHT30读取一次数据
- * @param dat —— 存储读取数据的地址（6个字节数组）
- * @retval 成功 —— 返回HAL_OK
- */
- uint8_t SHT30_Read_Dat(uint8_t* dat)
- {
- SHT30_Send_Cmd(READOUT_FOR_PERIODIC_MODE);
- return HAL_I2C_Master_Receive(&hi2c1, SHT30_ADDR_READ, dat, 6, 0xFFFF);
- }
- /*************************************************
- * 本驱动最大的难点，CRC验证；没看懂，懂行的来讲讲
- * 不管了会用就行
- */
-
- #define CRC8_POLYNOMIAL 0x31
-
- uint8_t CheckCrc8(uint8_t* const message, uint8_t initial_value)
- {
- uint8_t remainder; //余数
- uint8_t i = 0, j = 0; //循环变量
-
- /* 初始化 */
- remainder = initial_value;
-
- for(j = 0; j < 2;j++)
- {
- remainder ^= message[j];
-
- /* 从最高位开始依次计算 */
- for (i = 0; i < 8; i++)
- {
- if (remainder & 0x80)
- {
- remainder = (remainder << 1)^CRC8_POLYNOMIAL;
- }
- else
- {
- remainder = (remainder << 1);
- }
- }
- }
-
- /* 返回计算的CRC码 */
- return remainder;
- }
- /**
- * @brief 将SHT30接收的6个字节数据进行CRC校验，并转换为温度值和湿度值
- * @param dat —— 存储接收数据的地址（6个字节数组）
- * @retval 校验成功 —— 返回0
- * 校验失败 —— 返回1，并设置温度值和湿度值为0
- */
- uint8_t SHT30_Dat_To_Float(uint8_t* const dat, float *temperature,float *humidity)
- {
- uint16_t recv_temperature = 0;
- uint16_t recv_humidity = 0;
-
- /* 校验温度数据和湿度数据是否接收正确 */
- if(CheckCrc8(dat, 0xFF) != dat[2] || CheckCrc8(&dat[3], 0xFF) != dat[5])
- return 1;
-
- /* 转换温度数据 */
- recv_temperature = ((uint16_t)dat[0]<<8)|dat[1];
- *temperature = -45 + 175*((float)recv_temperature/65535);
-
- /* 转换湿度数据 */
- recv_humidity = ((uint16_t)dat[3]<<8)|dat[4];
- *humidity = 100 * ((float)recv_humidity / 65535);
-
- return 0;
- }
然后用HAL的硬件IIC发送函数，比较简单一条函数就搞定了。
- void SHT30_Reset(void);
- uint8_t SHT30_Init(void);
- uint8_t SHT30_Read_Dat(uint8_t* dat);
- uint8_t CheckCrc8(uint8_t* const message, uint8_t initial_value);
- uint8_t SHT30_Dat_To_Float(uint8_t* const dat, float* temperature, float* humidity);
- uint8_t dat[6]={0};
- float temperature ,humidity;
- /* USER CODE END 0 */
- /**
- * @brief The application entry point.
- * @retval int
- */
- int main(void)
- {
- /* USER CODE BEGIN 1 */
- /* USER CODE END 1 */
- /* MCU Configuration--------------------------------------------------------*/
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
- HAL_Init();
- /* USER CODE BEGIN Init */
- /* USER CODE END Init */
- /* Configure the system clock */
- SystemClock_Config();
- /* USER CODE BEGIN SysInit */
- /* USER CODE END SysInit */
- /* Initialize all configured peripherals */
- MX_GPIO_Init();
- MX_I2C1_Init();
- /* USER CODE BEGIN 2 */
- SHT30_Reset();
- SHT30_Init();
- /* USER CODE END 2 */
- /* Infinite loop */
- /* USER CODE BEGIN WHILE */
- while (1)
- {
- /* USER CODE END WHILE */
- /* USER CODE BEGIN 3 */
- SHT30_Read_Dat(dat);
- SHT30_Dat_To_Float(dat,&temperature,&humidity);
- }
- /* USER CODE END 3 */
- }
Main函数，这里先借鉴别人的代码，搞的复杂了。然后就是修改芯片，换成极海的。
然后烧录仿真，看结果。
是可以读到正确温度数值的。
楼主
