stm32vet6单片机RS485通信程序程序 -

#include "main.h"
#include "delay.h"
#include "uart5.h"
int main(void)
{
u16 len;
u8 time;
delay_init(); //延时初始化
RS485_1_Init(9600); //第一路485初始化
while(1)
{
if(time>=50) //time>=50表示500ms时间到
{
time=0; //清除计数位
RS485_1_printf("请您发送数据，以回车结尾\r\n"); //500ms时间到，发送提示信息
}
if(RS485_1_RX_STA&0x8000) //RS485_1_RX_STA位15置位，表示接收完成
{
len=RS485_1_RX_STA&0x3fff; //得到此次接收到的数据长度
RS485_1_RX_BUF[len]='\0' ; //加入结束符
RS485_1_printf("你发送的数据：%s\r\n",RS485_1_RX_BUF); //返回接收到的数据
RS485_1_RX_STA=0; //清除状态位
}
time++; //计数+1
delay_ms(10); //延时10ms
}
}

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/*-------------------------------------------------*/
/* RS485_1_1源文件,有2个函数 */
/*-------------------------------------------------*/
/* void RS485_1_1_Init(u32 bound) 485初始化串口5*/
/* void RS485_1_1_printf(char* fmt,...)485printf函数 */
/*-------------------------------------------------*/
#include "uart5.h"
#include "delay.h"
u8 RS485_1_RX_BUF[RS485_1_RXBUFF_SIZE]; //接收缓存区
u16 RS485_1_RX_STA=0; //接收状态标记
/*-------------------------------------------------*/
/*函数名：初始化串口5-RS485_1 */
/*参数：bound：波特率 */
/*返回值：无 */
/*-------------------------------------------------*/
void RS485_1_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE); //使能串口5时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); //使能GPIOC时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE); //使能GPIOD时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //PC12
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOC, &GPIO_InitStructure); //初始化PC12
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PD2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOD, &GPIO_InitStructure); //初始化PD2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //PD4
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //复用推挽输出
GPIO_Init(GPIOD, &GPIO_InitStructure); //初始化PD4
USART_InitStructure.USART_BaudRate = bound; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(UART5, &USART_InitStructure); //按配置设置串口4
USART_Cmd(UART5, ENABLE); //使能串口5
USART_ClearFlag(UART5, USART_FLAG_TC); //清除标志位
USART_ITConfig(UART5, USART_IT_RXNE, ENABLE); //开启接受中断
NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //串口5中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2; //抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =2; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //中断通道使能
NVIC_Init(&NVIC_InitStructure); //根据配置设置
RS485_1_RX_TX=0; //接收模式
}
/*-------------------------------------------------*/
/*函数名：第一路485的printf */
/*参数：无 */
/*返回值：无 */
/*-------------------------------------------------*/
__align(8) u8 RS485_1_TX_BUF[RS485_1_TXBUFF_SIZE];
void RS485_1_printf(char* fmt,...)
{
u16 i,length;
va_list ap;
va_start(ap,fmt);
vsprintf((char*)RS485_1_TX_BUF,fmt,ap);
va_end(ap);
RS485_1_RX_TX=1; //发送模式
delay_ms(1);
length=strlen((const char*)RS485_1_TX_BUF);
while((UART5->SR&0X40)==0);
for(i = 0;i < length;i ++)
{
UART5->DR = RS485_1_TX_BUF[i];
while((UART5->SR&0X40)==0);
}
RS485_1_RX_TX=0; //接收模式
delay_ms(1);
}

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