conflicting types for __putchar

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Max Pohl

• March 30, 2021 11:47
• Edited

Hello,

i tried to build a older project in CrossStudio for ARM.
Now i get an error "conflicting types for __putchar"

This is my code in the c file:

/**

  * @brief  Retargets the C library printf function to the USART.

  * @param  None

  * @retval None

  */

int __putchar(int ch){

    if (ch == '\n') {

        putchar('\r');

    }

    

    while (USART_GetFlagStatus(UART5, USART_FLAG_TXE) == RESET){

    };

    USART_SendData(UART5, (uint8_t)ch);

    while (USART_GetFlagStatus(UART5, USART_FLAG_TC) == RESET){

    };

    return ch;

}

 

and this from the .h file:

int __putchar(int ch);

 

 Do i need to define something in the setting to get rid of this error?

Best regards

Max

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• 

  Jon Elliott

  • March 30, 2021 13:21

  The prototype for __putchar is now:

  int __putchar(int ch, __printf_tag_ptr ptr);

  All you should need to do is add the ptr parameter to your __putchar function definition.

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  Max Pohl

  • March 30, 2021 13:47

  perfect that works!!

  thank you so much!

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