初级会员
- 积分
- 57
- 金钱
- 57
- 注册时间
- 2023-5-23
- 在线时间
- 22 小时
|
1金钱
#include "stm32f10x.h"
#include "rs485.h"
#include "delay.h"
void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //CS_485
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //管脚2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //TX初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //管脚3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //RX初始化
}
void USART_Configuration(void)//串口初始化函数
{
//串口参数初始化
USART_InitTypeDef USART_InitStructure; //串口设置恢复默认参数
//初始化参数设置
USART_InitStructure.USART_BaudRate = 9600; //波特率9600
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长8位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1位停止字节
USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//打开Rx接收和Tx发送功能
USART_Init(USART2,&USART_InitStructure); //初始化
USART_ITConfig(USART2,USART_IT_TXE,ENABLE); //允许串口1发送中断。
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); //允许串口1接收中断。
USART_Cmd(USART2,ENABLE); //启动串口
USART_ClearFlag(USART2,USART_FLAG_TC); //发送完成标志位
}
void NVIC_Configuratio(void)//配置中断优先级
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void USART2_IRQHandler(void)
{
u8 RX_dat;
if(USART_GetITStatus(USART2,USART_IT_RXNE)==SET)//USART_IT_RXNE:接收中断
{
RX_dat=USART_ReceiveData(USART2);
GPIO_SetBits(GPIOD,GPIO_Pin_7);
delay_ms(1);
USART_SendData(USART2,RX_dat);
while(USART_GetFlagStatus(USART2,USART_FLAG_TXE) == RESET){} //发送数据寄存器空标志位
delay_ms(2);
GPIO_ResetBits(GPIOD,GPIO_Pin_7);
}
}
//===================================
#include "stm32f10x.h"
#include "rs485.h"
void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void NVIC_Configuratio(void);
int main()
{
SystemInit();//72m
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
NVIC_Configuration();
GPIO_ResetBits(GPIOD,GPIO_Pin_7);
while(1)
{
}
}
|
|