STM32F407VGT6的485通信程序 【SP3485芯片&中断接收】
本例程为STM32F4XX(M4内核)的485通信程序,采用串口1发送和接收数据,中断接收,将接收到的数据重新发送出去。 主函数main.c文件如下:
#include \
/**********************************************************\\ ** 文 件 名: mian.c ************************************** ** 库 版 本: STM32F4xx_DSP_StdPeriph_Lib_V1.0.1 ********* ** 工作环境: RealView MDK-ARM 4.23 ********************* ** 作 者: 曾有根 ************************************* ** 生成日期: 2012-08-03 **********************************
** 功 能: RS485 通过串口1发送,中断接收!将接收到*** ** 的数据通过再次发送出去 ********************* \\**********************************************************/
extern void uart_init(void);
extern void USART1_SendByte(u8 Data);
extern unsigned char UART1_GetByte(u8 GetData); extern void delay(unsigned int dl);
void delay(unsigned int dl) {
unsigned int i,y;
for(i = 0; i < 5000; i++) {
for(y = 0; y < dl; y++); } }
static void led_init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable the GPIO_LED Clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
/* Configure the GPIO_LED pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOE, &GPIO_InitStructure); }
int main(void) {
uart_init(); led_init();
while (1) {
USART1_SendByte(0x12);
GPIO_SetBits(GPIOE, GPIO_Pin_7 ); //LED1灯闪烁,表示数据发送完成
delay(1000);
GPIO_ResetBits(GPIOE, GPIO_Pin_7 );
delay(1000); } }
串口配置程序,Uart_Config.c文件如下:
#include \
extern void delay(unsigned int dl);
#define TX_485 GPIO_SetBits(GPIOA,GPIO_Pin_8); #define RX_485 GPIO_ResetBits(GPIOA,GPIO_Pin_8);
void USART1_SendByte(u8 SendData) {
TX_485; //打开发送控制端
delay(10); //延时,这个必须加上,不加会导致数据出错
USART_SendData(USART1,SendData); //发送数据
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); //等待数据发送完成 delay(10);
RX_485; //关闭发送控制端 }
unsigned char UART1_GetByte(u8 MidData)
{
RX_485; //打开接收控制端
delay(10); //延时,同样必须加上
MidData = USART_ReceiveData(USART1); //接收数据
delay(10);
TX_485; //关闭接收控制端
return MidData; }
void USART1_IRQHandler(u8 GetData) {
u8 BackData;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //中断产生 {
GetData = UART1_GetByte(BackData); //直接读取寄存器的数据也行 GetData = USART1->DR;
USART1_SendByte(GetData); 发送数据
GPIO_SetBits(GPIOE, GPIO_Pin_8 ); //LED2灯闪烁,表示数据接收成功且发送完成 delay(1000);
GPIO_ResetBits(GPIOE, GPIO_Pin_8 ); } }
void uart_init(void) {
USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Connect USART pins to A9\\10 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
// /* Configure USART Tx and Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //输出TX GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //必须为AF,OUT不行
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //输入RX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //必须为AF,与M3不同
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ; //485使能端配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);
/* Enable USART */
USART_Cmd(USART1, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ClearFlag(USART1, USART_FLAG_TC); }
说明:已经经本人下载至STM32F4的开发板上成功调试,并且能够正确的收发数据!可供广大奋斗在前线的机油们参考!