串口配置代码
__IO uint8_t RS485_RxBuffer[256];
__IO uint8_t RS485_RXCount=0;
void RS485Config(enum USARTxNumber RS485Number,uint32_t usrBaudRate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
switch(RS485Number)
{
case RS485_2:
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); //使能外设时钟
//使能串口2的发送和接收 和中断
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
// Enable the USART2 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/*
*/
//GPIO结构的成员设置如下：
/*--------------485控制端初始化*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD, GPIO_Pin_11);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //485_TX
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //485_RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
//串口的结构成员设置如下：
USART_InitStructure.USART_BaudRate = usrBaudRate;
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_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStructure);
/* Enable the USART Receive interrupt: this interrupt is generated when the USART receive data register is not empty */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_Cmd(USART2, ENABLE);// USART2 Enable
break;
case RS485_3:
/* 使能 USART3 时钟*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); //使能外设时钟
/*
//使能串口3的发送和接收中断
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
//Enable the USART3 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD, GPIO_Pin_12);
/* USART3 使用IO端口配置 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化GPIO
/* USART3 工作模式配置 */
USART_InitStructure.USART_BaudRate = usrBaudRate; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位数设置：8位
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位设置：1位
USART_InitStructure.USART_Parity = USART_Parity_No ; //是否奇偶校验：无
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制模式设置：没有使能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//接收与发送都使能
USART_Init(USART3, &USART_InitStructure); //初始化USART3
/* Enable the USART Receive interrupt: this interrupt is generated when the USART receive data register is not empty */
//USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_Cmd(USART3, ENABLE);// USART3 Enable
break;
case RS485_4:
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4 ,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD, ENABLE);
/*
//Configure the NVIC Preemption Priority Bits
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
// Enable the UART4 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD, GPIO_Pin_13);
/* USART4 GPIO config */
/* Configure USART4 Tx (PC.10) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART4 Rx (PC.11) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* USART4 mode config */
USART_InitStructure.USART_BaudRate = usrBaudRate;
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(UART4, &USART_InitStructure);
//USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
USART_Cmd(UART4, ENABLE);
break;
}
数据接收中断代码：
#include "485Ctrl.h"
extern uint8_t RS485_RxBuffer[256];
extern uint8_t RS485_RXCount;
void USART2_IRQHandler(void)
{
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART2, USART_IT_RXNE);
RS485_RxBuffer[RS485_RXCount++]=USART_ReceiveData(USART2);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
}
//如果为空闲总线中断
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)
{
USART_ITConfig(USART2, USART_IT_IDLE, DISABLE);
USART_ClearITPendingBit(USART2, USART_IT_IDLE);
//处理接收到的数据代码略
RS485_RXCount=0;
}
} |
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