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STM32如何读取PM2.5.PM10的数据？

570 STM32

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答案对人有帮助，有参考价值 0 用串口1发送开机命令，STM32接收到数据后通过串口2发送给传感器。数据的发送是通过中断发送，下面贴出程序源码，由于是初学，有不合适的欢迎提出来一起学习。串口1初始化，及相关函数 #include “usart.h” / @brief 配置中断优先级参数使用中断时在主函数开始要加入 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);配置嵌套向量中断控制器组 @param 无 @retval 无 / static void NVIC_Config(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = CUSTOM_USART1_IRQ; //配置USART为中断源 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级 NVIC_Init(&NVIC_InitStructure); } / @brief 初始化串口1，配置中断优先级 @param 无 @retval 无 / void USART1_Custom_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStrutre; CUSTOM_USART1_APBxClkCmd(CUSTOM_USART1_CLK, ENABLE); CUSTOM_USART1_GPIO_APBxClkCmd(CUSTOM_USART1_GPIO_CLK, ENABLE); // 将USART Tx的GPIO配置为推挽复用模式 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = CUSTOM_USART1_TX_GPIO_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(CUSTOM_USART1_TX_GPIO_PORT, &GPIO_InitStructure); // 将USART Rx的GPIO配置为浮空输入模式 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Pin = CUSTOM_USART1_RX_GPIO_PIN; GPIO_Init(CUSTOM_USART1_RX_GPIO_PORT, &GPIO_InitStructure); USART_InitStrutre.USART_BaudRate = CUSTOM_USART1_BaudRate; USART_InitStrutre.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStrutre.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; USART_InitStrutre.USART_Parity = USART_Parity_No; USART_InitStrutre.USART_StopBits = USART_StopBits_1; USART_InitStrutre.USART_WordLength = USART_WordLength_8b; USART_Init(CUSTOM_USART1x, &USART_InitStrutre); //初始化串口1 NVIC_Config(); //需要中断服务的时候开启 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //需要中断服务的时候开启，开启串口接受中断 USART_Cmd(CUSTOM_USART1x, ENABLE);// 使能串口 } / @brief 发送一个字节 @param pUSARTx选择串口 Data数据 @retval 无 / void Usart_SendByte(USART_TypeDef pUSARTx, uint8_t Data) { USART_SendData(pUSARTx, Data); while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET); } /* @brief 发送一个数组 @param pUSARTx选择串口 data数组首地址 num数组长度 @retval 无 / void Usart_SendArray(USART_TypeDef pUSARTx, uint8_t data, uint8_t num) { uint8_t t; for(t = 0; t < num; t++) { Usart_SendByte(pUSARTx, data[t]); } while(USART_GetFlagStatus(pUSARTx, USART_FLAG_TC) == RESET); } ///** //* @brief 接收一个字节 //* @param pUSARTx选择串口 //* @retval 接收到的数据 //*/ //uint8_t Usart_ReceiveByte(USART_TypeDef pUSARTx) //{ // uint8_t GetData = 0; // if(USART_GetFlagStatus(pUSARTx ,USART_FLAG_RXNE) == SET) // GetData = USART_ReceiveData(pUSARTx); // USART_ClearFlag(pUSARTx, USART_FLAG_RXNE); // return GetData; //} ///** //* @brief 接收多个字节的数组该函数使用需要有帧头帧尾 //* @param pUSARTx选择串口 data数组首地址 start帧头 end帧尾 //* @retval 错误返回1 //*/ //void Usart_ReceiceArray(USART_TypeDef pUSARTx, uint8_t data, uint8_t num) //{ // uint8_t temp; // for(temp = 0; temp < num; temp++) // { // data[temp] = Usart_ReceiveByte(pUSARTx); // } //} //重定向c库函数printf到串口，重定向后可使用printf函数 int fputc(int ch, FILE f) { USART_SendData(USART1, (uint8_t) ch); while (USART_GetFlagStatus(CUSTOM_USART1x, USART_FLAG_TXE) == RESET); return ch; } //重定向c库函数scanf到串口，重写向后可使用scanf、getchar等函数 int fgetc(FILE f) { while (USART_GetFlagStatus(CUSTOM_USART1x, USART_FLAG_RXNE) == RESET); return (int)USART_ReceiveData(CUSTOM_USART1x); } 串口1对应的头文件 #ifndef USART_H* #define USART_H #include “stm32f10x.h” #include //串口1-USART1 #define CUSTOM_USART1_APBxClkCmd RCC_APB2PeriphClockCmd #define CUSTOM_USART1_CLK RCC_APB2Periph_USART1 #define CUSTOM_USART1x USART1 #define CUSTOM_USART1_BaudRate 115200 //USART_GPIO #define CUSTOM_USART1_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define CUSTOM_USART1_GPIO_CLK RCC_APB2Periph_GPIOA #define CUSTOM_USART1_TX_GPIO_PORT GPIOA #define CUSTOM_USART1_TX_GPIO_PIN GPIO_Pin_9 #define CUSTOM_USART1_RX_GPIO_PORT GPIOA #define CUSTOM_USART1_RX_GPIO_PIN GPIO_Pin_10 #define CUSTOM_USART1_IRQ USART1_IRQn #define CUSTOM_USART1_IRQHandler USART1_IRQHandler //串口2-USART2 #define CUSTOM_USART2_APBxClkCmd RCC_APB1PeriphClockCmd #define CUSTOM_USART2_CLK RCC_APB1Periph_USART2 #define CUSTOM_USART2x USART2 #define CUSTOM_USART2_BaudRate 9600 //USART_GPIO #define CUSTOM_USART2_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define CUSTOM_USART2_GPIO_CLK RCC_APB2Periph_GPIOA #define CUSTOM_USART2_TX_GPIO_PORT GPIOA #define CUSTOM_USART2_TX_GPIO_PIN GPIO_Pin_2 #define CUSTOM_USART2_RX_GPIO_PORT GPIOA #define CUSTOM_USART2_RX_GPIO_PIN GPIO_Pin_3 #define CUSTOM_USART2_IRQ USART2_IRQn #define CUSTOM_USART2_IRQHandler USART2_IRQHandler 串口3-USART3 //#define CUSTOM_USART3_APBxClkCmd RCC_APB1PeriphClockCmd //#define CUSTOM_USART3_CLK RCC_APB1Periph_USART3 //#define CUSTOM_USART3x USART3 //#define CUSTOM_USART3_BaudRate 115200 USART_GPIO //#define CUSTOM_USART3_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd //#define CUSTOM_USART3_GPIO_CLK RCC_APB2Periph_GPIOB //#define CUSTOM_USART3_TX_GPIO_PORT GPIOB //#define CUSTOM_USART3_TX_GPIO_PIN GPIO_Pin_10 //#define CUSTOM_USART3_RX_GPIO_PORT GPIOB //#define CUSTOM_USART3_RX_GPIO_PIN GPIO_Pin_11 //#define CUSTOM_USART3_IRQ USART3_IRQn //#define CUSTOM_USART3_IRQHandler USART3_IRQHandler 串口4-UART4 //#define CUSTOM_USART3_APBxClkCmd RCC_APB1PeriphClockCmd //#define CUSTOM_USART3_CLK RCC_APB1Periph_UART4 //#define CUSTOM_USART3x UART4 //#define CUSTOM_USART3_BaudRate 115200 USART_GPIO //#define CUSTOM_USART3_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd //#define CUSTOM_USART3_GPIO_CLK RCC_APB2Periph_GPIOC //#define CUSTOM_USART3_TX_GPIO_PORT GPIOC //#define CUSTOM_USART3_TX_GPIO_PIN GPIO_Pin_10 //#define CUSTOM_USART3_RX_GPIO_PORT GPIOC //#define CUSTOM_USART3_RX_GPIO_PIN GPIO_Pin_11 //#define CUSTOM_USART3_IRQ UART4_IRQn //#define CUSTOM_USART3_IRQHandler UART4_IRQHandler 串口5-UART5 //#define CUSTOM_USART3_APBxClkCmd RCC_APB1PeriphClockCmd //#define CUSTOM_USART3_CLK RCC_APB1Periph_UART5 //#define CUSTOM_USART3x UART5 //#define CUSTOM_USART3_BaudRate 115200 USART_GPIO //#define CUSTOM_USART3_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd //#define CUSTOM_USART3_GPIO_CLK (RCC_APB2Periph_GPIOC \| RCC_APB2Periph_GPIOD) //#define CUSTOM_USART3_TX_GPIO_PORT GPIOC //#define CUSTOM_USART3_TX_GPIO_PIN GPIO_Pin_12 //#define CUSTOM_USART3_RX_GPIO_PORT GPIOD //#define CUSTOM_USART3_RX_GPIO_PIN GPIO_Pin_2 //#define CUSTOM_USART3_IRQ UART5_IRQn //#define CUSTOM_USART3_IRQHandler UART5_IRQHandler void USART1_Custom_Init(void); void Usart_SendByte(USART_TypeDef pUSARTx, uint8_t Data); void Usart_SendArray(USART_TypeDef pUSARTx, uint8_t data, uint8_t num); //uint8_t Usart_ReceiveByte(USART_TypeDef pUSARTx); //void Usart_ReceiceArray(USART_TypeDef pUSARTx, uint8_t data, uint8_t num); #endif 主函数： #include “stm32f10x.h” #include “delay.h” #include “usart.h” #include “pm10.h” u8 USART_RX_Cmd[10]; u8 USART_RX_Data[10]; u8 Cmd_Data[9] = {0xAA, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x67, 0xBB}; u8 Cmd_End[9] = {0xAA, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x68, 0xBB}; u8 num, num_1 = 0, num_s1 = 0, num_2 = 0, num_s2 = 0; int main(void) { u8 i, flag = 0; uint16_t temp_10, temp; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); delay_init(); USART1_Custom_Init(); USART2_Custom_Init(); Usart_SendArray(USART2, Cmd_End, 9); while(1) { if(flag == 1) { Usart_SendArray(USART2, Cmd_Data, 9); temp_10 = USART_RX_Data[4] * 256 + USART_RX_Data[5]; temp = USART_RX_Data[2] * 256 + USART_RX_Data[3]; printf(“PM2.5浓度为%dt PM10浓度为%drn”, temp, temp_10); for(i=0; i<9; i++) { USART_RX_Data = 0x00; } } if((USART_RX_Cmd[0] == 0xAA) && (USART_RX_Cmd[1] == 0x01)) { Usart_SendArray(USART2, USART_RX_Cmd, 9); for(i=0; i<9; i++) { USART_RX_Cmd = 0x00; } flag = 1; } if((USART_RX_Cmd[0] == 0xAA) && (USART_RX_Cmd[1] == 0x03)) { Usart_SendArray(USART2, USART_RX_Cmd, 9); for(i=0; i<9; i++) { USART_RX_Cmd = 0x00; USART_RX_Data = 0x00; } flag = 0; } delay_ms(5000); } } void CUSTOM_USART1_IRQHandler(void) //串口1中断服务程序 { if(USART_GetITStatus(CUSTOM_USART1x ,USART_IT_RXNE) == SET) { USART_ClearITPendingBit(CUSTOM_USART1x, USART_IT_RXNE); USART_RX_Cmd[num_1] = USART_ReceiveData(CUSTOM_USART1x); num_1 ++; } if(USART_RX_Cmd[num_1 - 1] == 0xAA) num_s1 = num_1 - 1; if((USART_RX_Cmd[num_s1] == 0xAA) && (USART_RX_Cmd[num_1 - 1] == 0xBB)) { num_1 = 0; } if(USART_GetFlagStatus(CUSTOM_USART1x, USART_FLAG_ORE) == SET) //溢出 { USART_ClearFlag(CUSTOM_USART1x, USART_FLAG_ORE); //读SR USART_ReceiveData(CUSTOM_USART1x); //读DR } } void CUSTOM_USART2_IRQHandler(void) //串口2中断服务程序 { if(USART_GetITStatus(CUSTOM_USART2x ,USART_IT_RXNE) == SET) { USART_ClearITPendingBit(CUSTOM_USART2x, USART_IT_RXNE); USART_RX_Data[num_2] = USART_ReceiveData(CUSTOM_USART2x); num_2 ++; } if(USART_RX_Data[num_2 - 1] == 0xAA) num_s2 = num_2 - 1; if((USART_RX_Data[num_s2] == 0xAA) && (USART_RX_Data[num_2 - 1] == 0xBB)) { num_2 = 0; } if(USART_GetFlagStatus(CUSTOM_USART2x, USART_FLAG_ORE) == SET) //溢出 { USART_ClearFlag(CUSTOM_USART2x, USART_FLAG_ORE); //读SR USART_ReceiveData(CUSTOM_USART2x); //读DR } }

2021-12-13 14:57:38 评论举报张慧