使用软件：IAR FOR STM8

编程方式：固件库

硬件配套：STM8S105K4T6最小系统板

注意事项：需在IAR工程配置中：在 General Options->Library Configuration->Library 选择 Full；在 General Options->Library Options->Printf formatter 选择 Large，Math functions 选择 Default；另外不能串口打印小数，需进一步处理数据

这是我在做课设时参考的代码，现记录如下：

1. uart.h

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#ifndef __UART_H
#define __UART_H

#include "stm8s.h"
#include "stdio.h"

#ifdef _RAISONANCE_
#define PUTCHAR_PROTOTYPE int putchar (char c)
#define GETCHAR_PROTOTYPE int getchar (void)
#elif defined (_COSMIC_)
#define PUTCHAR_PROTOTYPE char putchar (char c)
#define GETCHAR_PROTOTYPE char getchar (void)
#else /* _IAR_ */
#define PUTCHAR_PROTOTYPE int putchar (int c)
#define GETCHAR_PROTOTYPE int getchar (void)
#endif /* _RAISONANCE_ */

void UART2_Config(void);
void UART2_SendByte(u8 data);
void UART2_SendStr(const unsigned char *p_str);
void Delay(uint32_t nCount);

#endif /* __UART_H */

2. uart.c

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#include "UART.h"

void UART2_Config(void)
{
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART2, ENABLE);
    UART2_DeInit();	

	/*
	 * 将UART2配置为：
	 * 波特率 = 115200
	 * 数据位 = 8
	 * 1位停止位
	 * 无校验位
	 * 使能接收和发送
	 * 使能接收中断
	 */

    UART2_Init((u32)115200, UART2_WORDLENGTH_8D, UART2_STOPBITS_1, UART2_PARITY_NO , UART2_SYNCMODE_CLOCK_DISABLE , UART2_MODE_TXRX_ENABLE);
    UART2_ITConfig(UART2_IT_RXNE_OR, ENABLE);
    UART2_Cmd(ENABLE);
}

void Delay(uint32_t nCount)
{
  /* Decrement nCount value */
  while (nCount != 0)
  {   
    nCount--;
  }
}

void UART2_SendByte(u8 data)
{
	UART2_SendData8((unsigned char)data);

	/* 等待传输结束 */
	while (UART2_GetFlagStatus(UART2_FLAG_TXE) == RESET);
}

void UART2_SendStr(const unsigned char *p_str)
{
//  u8 i = 0;
  while(*p_str != '\0')
  {
    UART2_SendByte(*p_str);
 //   Delay(1000);
    p_str++;
  }
}

/**********************************printf*********************************************/

/**
  * @brief Retargets the C library printf function to the UART.
  * @param c Character to send
  * @retval char Character sent
  */
PUTCHAR_PROTOTYPE
{
  /* Write a character to the UART2 */
  UART2_SendData8(c);
  /* Loop until the end of transmission */
  while (UART2_GetFlagStatus(UART2_FLAG_TXE) == RESET);
  return (c);
}

/**
  * @brief Retargets the C library scanf function to the USART.
  * @param None
  * @retval char Character to Read
  */
GETCHAR_PROTOTYPE
{
#ifdef _COSMIC_
  char c = 0;
#else
  int c = 0;
#endif
  /* Loop until the Read data register flag is SET */
  while (UART2_GetFlagStatus(UART2_FLAG_RXNE) == RESET);
  c = UART2_ReceiveData8();
  return (c);
}