usart.c
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#include "dev.h"
#include "usart.h"
#include "timer.h"
#include "delay.h"
//加入以下代码,支持printf函数,而不需要选择use MicroLIB
#if 11
#pragma import(__use_no_semihosting)
//标准库需要的支持函数
struct __FILE
{
int handle;
};
FILE __stdout;
//定义_sys_exit()以避免使用半主机模式
void _sys_exit(int x)
{
x = x;
}
#endif
int fputc(int ch, FILE *f) //重定义fputc函数
{
while((USART1->SR&0X40)==0);//循环发送,直到发送完毕
USART1->DR = (uint8_t) ch;
return ch;
}
void USART1_Config(uint32_t bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能USART1时钟
GPIO_PinAFConfig(DBG_RXD_Port,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
GPIO_PinAFConfig(DBG_TXD_Port,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
GPIO_InitStructure.GPIO_Pin = DBG_RXD_Pin | DBG_TXD_Pin; //GPIOA9与GPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(DBG_RXD_Port,&GPIO_InitStructure); //初始化
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(USART1, &USART_InitStructure); //初始化串口1
USART_Cmd(USART1, ENABLE); //使能串口1
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启相关中断
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口1中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 3; //抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //初始化VIC寄存器
}
/****************************************************
*@brief: 串口5配置
*@param: uart 串口指针
* bound 串口波特率
*@retval： 无返回值
*****************************************************/
void UART5_Config(uint32_t bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE);
GPIO_PinAFConfig(U485_RX_Port,GPIO_PinSource2,GPIO_AF_UART5);
GPIO_PinAFConfig(U485_TX_Port,GPIO_PinSource12,GPIO_AF_UART5);
GPIO_InitStructure.GPIO_Pin = U485_RX_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(U485_RX_Port,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = U485_TX_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(U485_TX_Port,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = EN_485_Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(EN_485_Port,&GPIO_InitStructure);
UART5_Mode(RS485_READ);
USART_InitStructure.USART_BaudRate = bound;
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(UART5, &USART_InitStructure);
USART_Cmd(UART5, ENABLE);
USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
u32 UART_RX_CNT = 0;
u8 UART_RX_BUF[USART_REC_LEN] __attribute__ ((at(SRAM_EXT_ADDR))); //EXTI SRAM 200k
void UART5_IRQHandler(void)
{
if(USART_GetITStatus(UART5,USART_IT_RXNE) != RESET)
{
UART_RX_BUF[UART_RX_CNT++] = UART5->DR;
TIM3->CNT = 0;
TIM_Cmd(TIM3,ENABLE);
if(UART_RX_CNT == USART_REC_LEN) //防止溢出
{
UART_RX_CNT = 0;
}
}
USART_ClearITPendingBit(UART5, USART_IT_RXNE);
}
void UART5_Mode(mode status)
{
if(status == RS485_WRITE)
{
GPIO_SetBits(EN_485_Port,EN_485_Pin);
}
else if(status == RS485_READ)
{
GPIO_ResetBits(EN_485_Port,EN_485_Pin);
}
}
/***************************
*
*
*
****************************/
void Clear_Uart5_Cache(void)
{
memset(UART_RX_BUF,0,UART_RX_CNT);
UART_RX_CNT = 0;
}
void Uart5_Send(uint8_t *data,uint16_t length)
{
UART5_Mode(RS485_WRITE);
Tick_Delay_ms(1);
uint8_t i ;
for(i=0;i<length;i++)
{
USART_SendData(UART5,data[i]);
while((UART5->SR&0X40)==0);
}
Tick_Delay_ms(1);
UART5_Mode(RS485_READ);
}
#if 1
void USART1_IRQHandler(void) //串口1中断服务程序
{
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
}
#endif