阅读量:0
程序目的：
实现STM32开通三个串口，每个串口都可以实现接收和发送数据。
注意事项：
编程时，严禁在中断函数中写入发送串口数据代码，否则会出错，具体原因不清楚（有大佬知道的话帮我指出），可能原因是DR寄存器冲突导致。
开始编程：
Serial.c
#include "stm32f10x.h" // Device header #include <stdio.h> //#include "OLED.h" //#include "Delay.h" #include <stdarg.h> char Serial_RxPacket1[100]; char Serial_RxPacket2[100]; uint8_t Serial_RxFlag1; uint8_t Serial_RxFlag2; uint8_t Serial_RxFlag3; void Serial_Init(USART_TypeDef *USARTx) { GPIO_InitTypeDef GPIO_Init_Structure; //定义GPIO结构体 USART_InitTypeDef USART_Init_Structure; //定义串口结构体 NVIC_InitTypeDef NVIC_Init_Structure; //定义中断结构体 if(USARTx == USART1){ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //开启GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //开启APB2总线复用时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //开启USART1时钟 GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_9; GPIO_Init_Structure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_Init_Structure); GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_IPU; //浮空输入或者上拉输入，使用上拉输入抗干扰能力更强 GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_10; GPIO_Init_Structure.GPIO_Speed = GPIO_Speed_50MHz; USART_Init_Structure.USART_BaudRate = 115200; //波特率 USART_Init_Structure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流控制(不使用，CTS，CTS&RTS) USART_Init_Structure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //串口模式 可以使用（或）|符号实现Tx和Rx同时设置 USART_Init_Structure.USART_Parity = USART_Parity_No; //校验位,无需校验 USART_Init_Structure.USART_StopBits = USART_StopBits_1; //停止位，选择1位 USART_Init_Structure.USART_WordLength = USART_WordLength_8b; //字长 USART_Init(USART1, &USART_Init_Structure); USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启RXNE到NVIC的输出,开启中断 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_Init_Structure.NVIC_IRQChannel = USART1_IRQn; NVIC_Init_Structure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init_Structure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_Init_Structure.NVIC_IRQChannelSubPriority = 1; NVIC_Init(&NVIC_Init_Structure); } if(USARTx == USART2) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //开启GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //开启APB2总线复用时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); //开启USART1时钟 //配置PA2 TX GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽 GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_2; GPIO_Init_Structure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_Init(GPIOA, &GPIO_Init_Structure); //配置PA3 RX GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_3; GPIO_Init(GPIOA, &GPIO_Init_Structure); USART_Init_Structure.USART_BaudRate = 115200; //波特率设置为115200 USART_Init_Structure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制为无 USART_Init_Structure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //模式设为收和发 USART_Init_Structure.USART_Parity = USART_Parity_No; //无校验位 USART_Init_Structure.USART_StopBits = USART_StopBits_1; //一位停止位 USART_Init_Structure.USART_WordLength = USART_WordLength_8b; //字长为8位 USART_Init(USART2, &USART_Init_Structure); USART_Cmd(USART2, ENABLE); USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_Init_Structure.NVIC_IRQChannel = USART2_IRQn; NVIC_Init_Structure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init_Structure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_Init_Structure.NVIC_IRQChannelSubPriority = 1; NVIC_Init(&NVIC_Init_Structure); } if(USARTx == USART3) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //开启GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //开启APB2总线复用时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //开启USART1时钟 //配置PB10 TX GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽 GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_10; GPIO_Init_Structure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_Init( GPIOB, &GPIO_Init_Structure); //配置PB11 RX GPIO_Init_Structure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init_Structure.GPIO_Pin = GPIO_Pin_11; GPIO_Init( GPIOB, &GPIO_Init_Structure); USART_Init_Structure.USART_BaudRate = 115200; //波特率设置为115200 USART_Init_Structure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制为无 USART_Init_Structure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //模式设为收和发 USART_Init_Structure.USART_Parity = USART_Parity_No; //无校验位 USART_Init_Structure.USART_StopBits = USART_StopBits_1; //一位停止位 USART_Init_Structure.USART_WordLength = USART_WordLength_8b; //字长为8位 USART_Init(USART3, &USART_Init_Structure); USART_Cmd(USART3, ENABLE); USART_ITConfig(USART3,USART_IT_RXNE,ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_Init_Structure.NVIC_IRQChannel = USART3_IRQn; NVIC_Init_Structure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init_Structure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_Init_Structure.NVIC_IRQChannelSubPriority = 1; NVIC_Init(&NVIC_Init_Structure); } } void Serial_SendByte(USART_TypeDef *USARTx,uint8_t Byte) { USART_SendData(USARTx, Byte);//发送数据 while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET) {//等待发送寄存器空， //TXE就是发送寄存器空的标志位，不需要手动清零，下一次发送数据时候会自动清零 } } void Serial_SendArray(USART_TypeDef *USARTx, uint8_t *Array, uint16_t Length){ uint16_t i; for(int i = 0; i < Length; i++) { Serial_SendByte(USARTx, Array[i]); } } void Serial_SendString(USART_TypeDef *USARTx, char *Str) {//字符串自带结束标志位 uint8_t i; for(int i = 0; Str[i] != '\0'; i++) { Serial_SendByte(USARTx, Str[i]); } } //*****************************************发送数字 uint32_t Serial_Pow(uint32_t X, uint32_t y) { uint32_t Result = 1; while(y--) { Result *= X; } return Result; } void Serial_SendNumber(USART_TypeDef *USARTx, uint32_t Number, uint8_t Length) { uint8_t i; for(int i = 0; i < Length; i++){ Serial_SendByte(USARTx, (Number / Serial_Pow(10, Length - i - 1)) % 10 + '0'); } } //*****************************************发送数字 int fputc(int ch, FILE* f){ Serial_SendByte(USART1, ch);//重定向到串口1，使得Printf打印到串口 return ch; } //使用sprintf让其他的串口也能使用，sprintf可以把格式化字符输出到一个字符串里 void Serial_Printf(USART_TypeDef *USARTx, char* format,...){ char String[100]; va_list arg; va_start(arg, format); vsprintf(String, format, arg); va_end(arg); Serial_SendString(USARTx,String); } uint8_t Serial_GetRxFlag(USART_TypeDef *USARTx) { if(USARTx == USART1) { if(Serial_RxFlag1 == 1){ Serial_RxFlag1 = 0; return 1; } } else if(USARTx == USART2) { if(Serial_RxFlag2 == 1){ Serial_RxFlag2 = 0; return 1; } } else if(USARTx == USART3) { if(Serial_RxFlag3 == 1){ Serial_RxFlag3 = 0; return 1; } } return 0; } void Serial_SendPacket(USART_TypeDef *USARTx){ } void USART1_IRQHandler() { static uint8_t RxState = 0;//类似全局变量，函数进入只会初始化一次0，函数退出仍然有效，与全局函数不同，静态变量只能在本函数中使用 static uint8_t pRxPacket = 0; char temp; //Serial_SendString(USART1,"Led Open Successful\r\n"); //Delay_ms(1000); if(USART_GetITStatus(USART1,USART_IT_RXNE)!= RESET) { uint8_t RxData = USART_ReceiveData(USART1); if(RxState == 0){ //若在这里将RxState置为1，那么下面就会立马执行，因此要加上else，也可用switch case语句 if(RxData == '@') { RxState = 1; pRxPacket = 0; } } else if(RxState == 1) { if(RxData == '\r'){ RxState = 2; } else { Serial_RxPacket1[pRxPacket] = RxData; pRxPacket ++; } } else if(RxState == 2){ if(RxData == '\n') { RxState = 0; Serial_RxFlag1 = 1; Serial_RxPacket1[pRxPacket] = '\0';//不加不能使用OLED_ShowString } } USART_ClearITPendingBit(USART1, USART_IT_RXNE); } } void USART2_IRQHandler() { static uint8_t RxState = 0;//类似全局变量，函数进入只会初始化一次0，函数退出仍然有效，与全局函数不同，静态变量只能在本函数中使用 static uint8_t pRxPacket = 0; char temp; //Serial_SendString(USART2,"Led Open Successful\r\n"); //Delay_ms(10); if(USART_GetITStatus(USART2,USART_IT_RXNE)!= RESET) { uint8_t RxData = USART_ReceiveData(USART2); if(RxState == 0){ //若在这里将RxState置为1，那么下面就会立马执行，因此要加上else，也可用switch case语句 if(RxData == '@') { RxState = 1; pRxPacket = 0; } } else if(RxState == 1) { if(RxData == '\r'){ RxState = 2; } else { Serial_RxPacket2[pRxPacket] = RxData; pRxPacket ++; } } else if(RxState == 2){ if(RxData == '\n') { RxState = 0; Serial_RxFlag2 = 1; Serial_RxPacket2[pRxPacket] = '\0';//不加不能使用OLED_ShowString } } USART_ClearITPendingBit(USART2, USART_IT_RXNE); } } void USART3_IRQHandler(void) { char temp; if(USART_GetITStatus(USART3,USART_IT_RXNE)!= RESET) { temp = USART_ReceiveData(USART3); if(temp == 'O') { GPIO_ResetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART3,"Led Open Successful\r\n"); } if(temp == 'C') { GPIO_SetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART3,"Led Close Successful\r\n"); } } }Serial.h
#ifndef __SERIAL_H #define __SERIAL_H #include <stdio.h> extern char Serial_RxPacket1[]; extern char Serial_RxPacket2[]; void Serial_Init(USART_TypeDef *USARTx); void Serial_SendByte(USART_TypeDef *USARTx,uint8_t Byte); void Serial_SendArray(USART_TypeDef *USARTx,uint8_t *Array, uint16_t Length); void Serial_SendString(USART_TypeDef *USARTx,char *String); void Serial_SendNumber(USART_TypeDef *USARTx,uint32_t Number, uint8_t Length); void Serial_Printf(USART_TypeDef *USARTx,char* format,...); uint8_t Serial_GetRxFlag(USART_TypeDef *USARTx); #endif GpioControl.c
#include "stm32f10x.h" // Device header void GpioInit(GPIO_TypeDef *GPIOx, uint16_t Pin, GPIOMode_TypeDef GpioMode){ uint32_t RCC_APB2Periph_GPIOx; if(GPIOx == GPIOA) { RCC_APB2Periph_GPIOx = RCC_APB2Periph_GPIOA; } else if(GPIOx == GPIOB) { RCC_APB2Periph_GPIOx = RCC_APB2Periph_GPIOB; } else if(GPIOx == GPIOC) { RCC_APB2Periph_GPIOx = RCC_APB2Periph_GPIOC; } RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOx, ENABLE);//ctrl + Alt + 空格：可以出现代码提示 GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Mode = GpioMode;//推挽输出 GPIO_InitStructure.GPIO_Pin = Pin; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOx, &GPIO_InitStructure); GPIO_ResetBits(GPIOx, Pin); } void GpioTurn(GPIO_TypeDef *GPIOx, uint16_t GPIO_PIN) {//反转当前引脚状态 if(GPIO_ReadOutputDataBit(GPIOx,GPIO_PIN) == 0){ GPIO_SetBits(GPIOx,GPIO_PIN); } else{ GPIO_ResetBits(GPIOx, GPIO_PIN); } } void GpioControl(GPIO_TypeDef *GPIOx, uint16_t GPIO_PIN, uint8_t sign) {//控制引脚 if(sign == ENABLE){ GPIO_SetBits(GPIOx, GPIO_PIN); } if(sign == DISABLE){ GPIO_ResetBits(GPIOx, GPIO_PIN); } } GpioControl.h
#ifndef __GPIOCONTROL_H #define __GPIOCONTROL_H void GpioInit(GPIO_TypeDef *GPIOx, uint16_t Pin, GPIOMode_TypeDef GpioMode); void GpioTurn(GPIO_TypeDef *GPIOx, uint16_t GPIO_PIN); void GpioControl(GPIO_TypeDef *GPIOx, uint16_t GPIO_PIN, uint8_t sign); #endif main.c
#include "stm32f10x.h" // Device header //#include "DELAY.h" //#include "OLED.h" #include "Serial.h" //#include "DigitalSwitch.h" #include "GpioControl.h" #include <string.h> uint8_t RxData; uint8_t KeyNum; int main() { GpioInit(GPIOC, GPIO_Pin_13, GPIO_Mode_Out_PP); GPIO_SetBits(GPIOC,GPIO_Pin_13); // DigitalSwitchInit(GPIOA, GPIO_Pin_1, GPIO_Mode_IPU); OLED_Init(); Serial_Init(USART1); Serial_Init(USART2); Serial_Init(USART3); //OLED_ShowString(1, 1, "TxData:"); //OLED_ShowString(3, 1, "RxData:"); while(1){ if(Serial_GetRxFlag(USART1) == 1) { if(strcmp(Serial_RxPacket1, "LED_ON") == 0) { GPIO_ResetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART1,Serial_RxPacket1); } else if(strcmp(Serial_RxPacket1, "LED_OFF") == 0) { GPIO_SetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART1,Serial_RxPacket1); } } if(Serial_GetRxFlag(USART2) == 1) { if(strcmp(Serial_RxPacket2, "LED_ON") == 0) { GPIO_ResetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART2,Serial_RxPacket2); } else if(strcmp(Serial_RxPacket2, "LED_OFF") == 0) { GPIO_SetBits(GPIOC,GPIO_Pin_13); Serial_SendString(USART2,Serial_RxPacket2); } } } } 程序现象：
RX，TX连接到A9，A10使用串口1，使用串口工具发送@LED_ON指令（记得发送时候按下回车，将\n也发送出去），串口回传LED_ON,同时LED灯被打开，发送LED_OFF同理。
RX，TX连接到A2，A3使用串口2，使用串口工具发送@LED_ON指令（记得发送时候按下回车，将\n也发送出去），串口回传LED_ON,同时LED灯被打开，发送LED_OFF同理。
RX，TX连接到B10，B11使用串口3，使用串口工具发送O字符，串口回传Led Open Successful\r\n,同时LED灯被打开，发送C字符同理。
