细颗粒物调试

引脚定义

TEMTOP ------> STM32 USART2
1.VCC ------> 5V
2.GND ------> GND
4.RX ------> PD6
5.TX ------> PD7

通讯协议

串口配置及中断

void UART2_Init(u32 bound)
{	
	//UART 初始化设置
	UART2_Handler.Instance=USART2;					    //USART2
	UART2_Handler.Init.BaudRate=bound;				    //波特率
	UART2_Handler.Init.WordLength=UART_WORDLENGTH_8B;   //字长为8位数据格式
	UART2_Handler.Init.StopBits=UART_STOPBITS_1;	    //一个停止位
	UART2_Handler.Init.Parity=UART_PARITY_NONE;		    //无奇偶校验位
	UART2_Handler.Init.HwFlowCtl=UART_HWCONTROL_NONE;   //无硬件流控
	UART2_Handler.Init.Mode=UART_MODE_TX_RX;		    //收发模式
	UART2_Handler.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  UART2_Handler.Init.OverSampling = UART_OVERSAMPLING_16;
	HAL_UART_Init(&UART2_Handler); //HAL_UART_Init()会使能UART2
	
	HAL_UART_Receive_IT(&UART2_Handler, (uint8_t *)uartBuffer, RXBUFFERSIZE);
}
/**USART2 GPIO Configuration    
    PD6     ------> USART2_TX
    PD7     ------> USART2_RX 
    */
	if(huart->Instance==USART2)//如果是串口1，进行串口1 MSP初始化
	{
		__HAL_RCC_GPIOD_CLK_ENABLE();			//使能GPIOA时钟
		__HAL_RCC_USART2_CLK_ENABLE();			//使能USART2时钟
	
		GPIO_Initure.Pin=GPIO_PIN_6 | GPIO_PIN_7;			//PD5\6
		GPIO_Initure.Mode=GPIO_MODE_AF_PP;		//复用推挽输出
		GPIO_Initure.Pull=GPIO_PULLUP;			//上拉
		GPIO_Initure.Speed=GPIO_SPEED_FAST;		//高速
		GPIO_Initure.Alternate=GPIO_AF7_USART2;	//复用为USART2
		HAL_GPIO_Init(GPIOD,&GPIO_Initure);	   	//初始化PD9
		
		#if EN_USART2_RX
			HAL_NVIC_EnableIRQ(USART2_IRQn);				//使能USART1中断通道
			HAL_NVIC_SetPriority(USART2_IRQn,3,3);			//抢占优先级3，子优先级3
		#endif	
	}
/*+-----------------细颗粒物中断函数-----------------+*/

uint8_t PM_RX_BUF[32];
uint8_t pmPoint = 0;
int PM1Data, PM25Data, PM10Data;

void USART2_IRQHandler(void)
{
	uint32_t tmp1 = 0U, tmp2 = 0U;
	tmp1 = __HAL_UART_GET_FLAG(&UART2_Handler, UART_FLAG_RXNE);
  tmp2 = __HAL_UART_GET_IT_SOURCE(&UART2_Handler, UART_IT_RXNE);
	
	if(tmp1 != RESET && tmp2 != RESET)
	{
		PM_RX_BUF[pmPoint] = (uint8_t)(UART2_Handler.Instance->DR & (uint8_t)0x00FFU);
		pmPoint ++;
		if(pmPoint == 2)
		{
			if(PM_RX_BUF[0] != 0x42 || PM_RX_BUF[1] != 0x4D)
			{
				pmPoint = 0;
			}
		}
		
		if(pmPoint == 32)
		{
			if(PM_RX_BUF[0] == 0x42 && PM_RX_BUF[1] == 0x4D)
			{
				PM1Data = PM_RX_BUF[4] * 256 + PM_RX_BUF[5];
				PM25Data = PM_RX_BUF[6] * 256 + PM_RX_BUF[7];
				PM10Data = PM_RX_BUF[8] * 256 + PM_RX_BUF[9];
				pmPoint = 0;
				//调试语句
				//HAL_UART_Transmit(&UART1_Handler,(uint8_t*)PM_RX_BUF,32,1000);
			}
			else
			{
				pmPoint = 0;
			}
		}
	}
	HAL_UART_IRQHandler(&UART2_Handler);
}

之前使用的是sensorion的颗粒物传感器，比此传感器更轻薄。