About the configuration of usart1 serial port multiplexing A2 and A3 of stm8l05RB

#include "uart1.h"

#include "stm8l15x.h"

void Uart1_Init(void)

{

        CLK_PeripheralClockConfig(CLK_Peripheral_USART1,ENABLE);

        SYSCFG_REMAPDeInit();

        SYSCFG_REMAPPinConfig(REMAP_Pin_USART1TxRxPortA,ENABLE);

GPIO_Init(GPIOA, GPIO_Pin_2, GPIO_Mode_Out_PP_High_Fast);//TXD

  GPIO_Init(GPIOA, GPIO_Pin_3, GPIO_Mode_In_PU_No_IT);//RXD

  USART_DeInit(USART1); // Duplicate UART1 

/*

* Configure UART1 as:

* Baud rate = 115200

* Data bits = 8

* 1 stop bit

* No check digit

* Enable receiving and sending

*/

USART_Init(USART1,(u32)115200, USART_WordLength_8b, USART_StopBits_1, 

USART_Parity_No, USART_Mode_Tx|USART_Mode_Rx);

USART_ClearITPendingBit(USART1, USART_IT_RXNE);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //Enable receive interrupt

//USART_ITConfig(USART1, USART_IT_TC, ENABLE); //Enable receive interrupt

USART_Cmd(USART1, ENABLE); //Enable UART2

}

/*******************************************************************************

 * Name: UART1_SendByte

 * Function: UART1 sends a byte

 * Parameters: data -> bytes to send

 * Return: None

 * Description: None 

 ******************************************************************************/

void UART1_SendByte(u8 data)

{

  USART_SendData8(USART1, data);

/* Wait for the transfer to complete */

while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

}

/*******************************************************************************

 * Name: UART1_SendStr

 * Function: UART1 sends len characters

 * Parameter: data -> points to the string to be sent

 * len -> number of bytes to send

 * Return: None

 * Description: None 

 ******************************************************************************/

void UART1_SendStr(u8 *str)

{

while(*str != '')

{

UART1_SendByte(*str++); /* Loop call to send a character function*/

} 

}

/*******************************************************************************

 * Name: UART2_ReceiveByte

 * Function: UART2 receives a character

 * Parameters: None

 * Return: received characters

 * Description: None 

 ******************************************************************************/

u8 UART1_ReceiveByte(void)

{

u8 UART1_RX_BUF; 

/* Wait for receiving to complete */

while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

UART1_RX_BUF = USART_ReceiveData8(USART1);

return  UART1_RX_BUF;

}

/*******************************************************************************

 * Name: fputc

 * Function: Redirect C library function printf to UART1

 * Parameters: None

 * Return: the character to be printed

 * Description: Called by printf 

 ******************************************************************************/

#ifdef _IAR_

int fputc(int ch, FILE *f)

{  

/* Send Printf content to the serial port*/

UART1_SendByte(ch);

return (ch);

}

#else

PUTCHAR_PROTOTYPE

{

   /* Write a character to the UART1 */

UART1_SendByte(c);

return (c);

}

#endif

GETCHAR_PROTOTYPE

{

#ifdef _COSMIC_

   char c = 0;

#else

   int c = 0;

#endif

   /* Loop until the Read data register flag is SET */

   while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

   c = USART_ReceiveData8(USART1);

   return (c);

}