easydemo_2342S/peripheral/myUart.c

#include "myUart.h" 
#include "stm32f10x_rcc.h"
#include "stm32f10x_usart.h"
#include "misc.h"

UART_CALLBACK uartCallBack;
   
uint8_t USART_RX_BUF[USART_REC_LEN];     //
uint16_t USART_RX_STA=0;       //接收状态标记    

void myUart1_init(uint32_t baudrate, UART_CALLBACK cb)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);  //使能USART1，GPIOA时钟

    //USART1_TX   GPIOA.9
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
    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);//初始化GPIOA.9

    //USART1_RX    GPIOA.10初始化
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
    GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;      //子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;         //IRQ通道使能
    NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

    //USART 初始化设置

    USART_InitStructure.USART_BaudRate = baudrate;//串口波特率
    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_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
    USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//开启串口接受中断
    // USART_ITConfig(USART1, USART_IT_TC, ENABLE);// 使能串口发送完成中断

    USART_Cmd(USART1, ENABLE);                    //使能串口1 
    uartCallBack = cb;
}

void myUart1_sendByte(uint8_t src)
{
    while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
    USART_SendData(USART1, src);
}
void myUart1_sendArray(uint8_t *src, uint16_t srclen)
{      
    while(srclen --)
    {
        myUart1_sendByte(*src);
        src ++;
    }
}
void USART1_IRQHandler(void)                    //串口1中断服务程序
{
    uint8_t Res;

    if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)
    {
        Res =USART_ReceiveData(USART1); //读取接收到的数据
        uartCallBack(USART_RX_BUF, USART_RX_STA);
        memset(USART_RX_BUF, 0, sizeof(USART_RX_BUF));
        USART_RX_STA=0;
        
    }
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //
    {
        Res =USART_ReceiveData(USART1); //读取接收到的数据
        USART_RX_BUF[USART_RX_STA] = Res ;
        USART_RX_STA++;
        if(USART_RX_STA > (USART_REC_LEN - 1))
        {
            USART_RX_STA=0;//接收数据错误,重新开始接收    
        }
    }            
} 

//////////////////////////////////////////////////////////////////
//加入以下代码,支持printf函数,而不需要选择use MicroLIB    
#if 1
#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    
_sys_exit(int x) 
{ 
    x = x; 
} 
//重定义fputc函数 
int fputc(int ch, FILE *f)
{      
    while((USART1->SR&0X40)==0);//循环发送,直到发送完毕   
    USART1->DR = (uint8_t) ch;      
    return ch;
}
#endif