[经验] 【STM32H5开发板】IIC读取湿温度

meiyao 2023-6-19 22:02 楼主

开发平台：KEIL

开发板：STM32H5

目地：本篇是利用STM32H5通过IIC读取AHT10的值，并显示在OLED上。

1.连接方式：

PC2--SCL

PC3--SDA

OLED看上一个连接。

2、IIC时序

3.核心代码：

#define AHT10_Delay_us(time)				HAL_Delay(time)	//delay_us(time)
#define AHT10_Delay_ms(time)				HAL_Delay(time)	//delay_ms(time)

#define AHT10_I2C_SCL_PIN      				GPIO_PIN_2
#define AHT10_I2C_SCL_GPIO_PORT   	  GPIOC  
#define AHT10_I2C_SCL_GPIO_RCC      	__HAL_RCC_GPIOC_CLK_ENABLE()  
 
#define AHT10_I2C_SDA_PIN      				GPIO_PIN_3
#define AHT10_I2C_SDA_GPIO_PORT   	  GPIOC
#define AHT10_I2C_SDA_GPIO_RCC      	__HAL_RCC_GPIOC_CLK_ENABLE() 

#define AHT10_SCL_H         HAL_GPIO_WritePin(AHT10_I2C_SCL_GPIO_PORT, AHT10_I2C_SCL_PIN, GPIO_PIN_SET)   
#define AHT10_SCL_L         HAL_GPIO_WritePin(AHT10_I2C_SCL_GPIO_PORT, AHT10_I2C_SCL_PIN, GPIO_PIN_RESET)

#define AHT10_SDA_H         HAL_GPIO_WritePin(AHT10_I2C_SDA_GPIO_PORT, AHT10_I2C_SDA_PIN, GPIO_PIN_SET)
#define AHT10_SDA_L         HAL_GPIO_WritePin(AHT10_I2C_SDA_GPIO_PORT, AHT10_I2C_SDA_PIN, GPIO_PIN_RESET)
#define AHT10_READ_SDA      HAL_GPIO_ReadPin(AHT10_I2C_SDA_GPIO_PORT,AHT10_I2C_SDA_PIN)

初始化：
	AHT10_I2C_SCL_GPIO_RCC;
	AHT10_I2C_SDA_GPIO_RCC;//??GPIO??
	GPIO_InitTypeDef  GPIO_InitStruct;
	GPIO_InitStruct.Mode  = GPIO_MODE_OUTPUT_PP;
  //GPIO_InitStruct.Pull  = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Pin = AHT10_I2C_SCL_PIN;
  HAL_GPIO_Init(AHT10_I2C_SCL_GPIO_PORT, &GPIO_InitStruct);
	
	GPIO_InitStruct.Mode  = GPIO_MODE_OUTPUT_PP;
  //GPIO_InitStruct.Pull  = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Pin = AHT10_I2C_SDA_PIN;
  HAL_GPIO_Init(AHT10_I2C_SDA_GPIO_PORT, &GPIO_InitStruct);
	
	AHT10_SDA_H;
	AHT10_SCL_H;


	AHT10_IIC_Init();
	
	AHT10_IIC_Start();
	AHT10_IIC_Send_Byte(AHT10_ADDRESS);
	AHT10_IIC_Send_Byte(0xe1);	
	AHT10_IIC_Send_Byte(0x08);
	AHT10_IIC_Send_Byte(0x00);
	AHT10_IIC_Stop();	
	AHT10_Delay_ms(40);//??20ms??????

		ret=AHT10ReadData(&temperature,&humidity);
		if(ret==0)
		{
			GUI_ShowString(0,0,(unsigned char*)"recv temp fail!",8,1);
		}
		else
		{
			float temp=temperature*0.1;
			float hum=humidity*0.1;
			//printf("temp:%2.1f,sd:%2.1f\r\n",temp,hum);
			char print_temp[64];
			char print_hum[64];
			sprintf(print_temp,"temp:%2.1f du",temp);
			sprintf(print_hum,"hum:%2.1f%%",hum);
			GUI_ShowString(0,0,(unsigned char*)print_temp,16,1);
			GUI_ShowString(0,2,(unsigned char*)print_hum,16,1);
			GUI_ShowString(0,4,(unsigned char*)"hello word!",16,1);
		}

4、视频

9fadaa328aa1ec2b6ef5a8aeb71868bd