一、STM32_CubeMX配置

/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}
/* I2C4 init function */
void MX_I2C4_Init(void)
{hi2c4.Instance = I2C4;hi2c4.Init.Timing = 0x20A0C4DF;hi2c4.Init.OwnAddress1 = 0;hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_ENABLE;hi2c4.Init.OwnAddress2 = 0;hi2c4.Init.OwnAddress2Masks = I2C_OA2_NOMASK;hi2c4.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;hi2c4.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;if (HAL_I2C_Init(&hi2c4) != HAL_OK){Error_Handler();}/** Configure Analogue filter*/if (HAL_I2CEx_ConfigAnalogFilter(&hi2c4, I2C_ANALOGFILTER_ENABLE) != HAL_OK){Error_Handler();}/** Configure Digital filter*/if (HAL_I2CEx_ConfigDigitalFilter(&hi2c4, 0) != HAL_OK){Error_Handler();}}void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
{GPIO_InitTypeDef GPIO_InitStruct = {0};if(i2cHandle->Instance==I2C3){/* USER CODE BEGIN I2C3_MspInit 0 *//* USER CODE END I2C3_MspInit 0 */__HAL_RCC_GPIOC_CLK_ENABLE();/**I2C3 GPIO ConfigurationPC8     ------> I2C3_SCLPC9     ------> I2C3_SDA*/GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9;GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Alternate = GPIO_AF8_I2C3;HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);/* I2C3 clock enable */__HAL_RCC_I2C3_CLK_ENABLE();/* USER CODE BEGIN I2C3_MspInit 1 *//* USER CODE END I2C3_MspInit 1 */}else if(i2cHandle->Instance==I2C4){/* USER CODE BEGIN I2C4_MspInit 0 *//* USER CODE END I2C4_MspInit 0 */__HAL_RCC_GPIOC_CLK_ENABLE();/**I2C4 GPIO ConfigurationPC6     ------> I2C4_SCLPC7     ------> I2C4_SDA*/GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;GPIO_InitStruct.Pull = GPIO_PULLUP;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Alternate = GPIO_AF8_I2C4;HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);/* I2C4 clock enable */__HAL_RCC_I2C4_CLK_ENABLE();/* USER CODE BEGIN I2C4_MspInit 1 *//* USER CODE END I2C4_MspInit 1 */}
}

二、测试源码

#define SHTC3_ADDR                   (0x70)
#define SHTC3_CMD_DEV_WRITE         (0xE0)      //(SHTC3_ADDR<<1)
#define SHTC3_CMD_DEV_READ          (0xE1)      //((SHTC3_ADDR<<1)|0x01)
#define SHTC3_CMD_SOFT_RESET        0x805D      //软件复位命令
#define SHTC3_CMD_READ_ID           0xEFC8      //读取SHTC3 ID命令
#define SHTC3_CMD_WAKEUP            0x3517
#define SHTC3_CMD_READ_HUM_DATA     0x5c24
#define SHTC3_CMD_READ_TEMP_DATA    0x7866
#define SHTC3_CMD_READ_SLEEP        0xB098
typedef struct
{uint8_t HumidityMSB;uint8_t HumidityLSB;uint8_t HumidityCRC;uint8_t temperatureMSB;uint8_t temperatureLSB;uint8_t temperatureCRC;
}Sthc3MeasureData;uint8_t Sthc3WriteByte(uint16_t Cmd)
{uint8_t WriteCmd[2];WriteCmd[0] = (uint8_t)(Cmd>>8);WriteCmd[1] = (uint8_t)(Cmd);if(HAL_I2C_Master_Transmit(&hi2c4, (uint16_t)SHTC3_CMD_DEV_WRITE , (uint8_t*)&WriteCmd, sizeof(WriteCmd), 1000) != HAL_OK){Error_Handler();printf("err (L=%d)\n", __LINE__);}while (HAL_I2C_GetState(&hi2c4) != HAL_I2C_STATE_READY);return 0;
}uint16_t Sthc3ReadWord(uint16_t Cmd)
{uint8_t WriteCmd[2];uint16_t ReadData;WriteCmd[0] = (uint8_t)(Cmd>>8);WriteCmd[1] = (uint8_t)(Cmd);if(HAL_I2C_Master_Transmit(&hi2c4, (uint16_t)SHTC3_CMD_DEV_WRITE , (uint8_t*)WriteCmd,  sizeof(WriteCmd), 1000) != HAL_OK) {Error_Handler();}while (HAL_I2C_GetState(&hi2c4) != HAL_I2C_STATE_READY);if(HAL_I2C_Master_Receive(&hi2c4, SHTC3_CMD_DEV_READ , (uint8_t*)&ReadData, 2, 1000) != HAL_OK) //接收word数据{Error_Handler();}return ReadData;
}void Sthc3ReadHumiAndTemp(void)
{uint8_t WriteCmd[2];float hum,temp;Sthc3MeasureData Sthc3Data = {0};uint8_t HumValue, TempValue;WriteCmd[0] = (uint8_t)(SHTC3_CMD_READ_HUM_DATA>>8);WriteCmd[1] = (uint8_t)(SHTC3_CMD_READ_HUM_DATA);if(HAL_I2C_Master_Transmit(&hi2c4, SHTC3_CMD_DEV_WRITE , (uint8_t*)WriteCmd,  sizeof(WriteCmd), 1000) != HAL_OK) {Error_Handler();}HAL_I2C_Master_Receive(&hi2c4, SHTC3_CMD_DEV_READ, (uint8_t *)&Sthc3Data, sizeof(Sthc3Data), 1000);hum = (Sthc3Data.HumidityMSB << 8)|(Sthc3Data.HumidityLSB);temp = (Sthc3Data.temperatureMSB << 8 )|Sthc3Data.temperatureLSB;HumValue = (uint8_t)(100*((float)hum/65535));              //湿度TempValue = (uint8_t)((175*((float)temp/65535)) - 45);     //温度printf("\nH:%d, T=%d\n", HumValue, TempValue);
}void Sthc3SensorI2cReadTask(void *argument)
{uint16_t DevID = 0;uint16_t ReadData = 0;Sthc3WriteByte(SHTC3_CMD_WAKEUP);HAL_Delay(1000);ReadData = Sthc3ReadWord(SHTC3_CMD_READ_ID);DevID = (ReadData<<8)|ReadData>>8;printf("\n(0x%04x)ID=0x%04x\n", DevID, DevID&0x083F);for(;;){Sthc3ReadHumiAndTemp();vTaskDelay(1000/portTICK_RATE_MS);  }
}

逻辑分析仪抓取波形：

​​​​​​​

结论：

1、接上从机传感器之后，CLK,  SDA电平被拉低。查看发现调试板子上拉硬件为10K，于是改为4.7K，拉低问题同样存在。重新换了从机电平信号正常，但数据结尾是NAK。

2、再查看PCB图，发现硬件CLK，SDA两个pin脚顺序错误，交换后读取设备ID正常。

3、源码参考如下：

xiaoshubaoVIP/STM32G473_Code: STM32G473测试code (github.com)

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