标题: STM8S-Discovery串口测试程序 [打印本页]

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作者: xiaos    时间: 2015-4-2 23:22
标题: STM8S-Discovery串口测试程序

#include <iostm8s105c6.h>
#include <stdio.h>

#define BAUD_RATE     9600         //波特率
#define F_CPU         16000000     //CPU频率

//串口配置
//数据位:8
//停止位:1
//校验位:None
void UART_Init(void)
{
    UART2_CR2_TEN = 1;
    UART2_CR2_REN = 1;
    UART2_CR2_RIEN = 1;
    UART2_BRR2 = ((unsigned char)((F_CPU / BAUD_RATE) & 0x0f)) + (((unsigned char)((F_CPU / BAUD_RATE) >> 8)) & 0xf0);
    UART2_BRR1 = ((unsigned char)((F_CPU / BAUD_RATE) >> 4));
}

void UART_TxByte(unsigned char _data)
{
    while (UART2_SR_TXE == 0);
    UART2_DR = _data;
}

int putchar(int c)
{
    UART_TxByte(c);
    return c;
}

int main(void)
{  
    CLK_SWCR_SWEN = 1;
    CLK_SWR = 0xB4;    //HSE selected as master clock source
   
    UART_Init();
    printf("********** STM8S-Discovery UART Test *********\r\n");
    printf("Build: %s  %s\r\n", __DATE__, __TIME__);
   
    asm("rim");
   
    while (1)
    {
    }
}

#pragma vector = UART2_R_RXNE_vector
__interrupt void UART2_IRQHandler(void)
{
    if (UART2_SR_RXNE == 1)
    {
        UART_TxByte(UART2_DR);
    }
}

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