Retarget scanf stm32 atollic

[kostalexis]

Posted on October 17, 2011 at 18:59

Hi guys,

I am trying to retarget scanf for USART1 of STM32 using Atollic. I think the utilized toolchain makes use of _read_r for the scanf (please verify if possible). So I need a new definition of _read_r. Any ideas?I have looked at IAR's _read for keyboard I/O and tried to modify for Atollic (_read_r redirected to USART1) but no luck until now. Thanks!

[Tesla DeLorean]

Posted on October 17, 2011 at 20:59

http://mcu.cz/print.php?news.2265

1. int

   _read_r

   (

   void

   *reent, uint16_t fd,

   char

   *ptr, uint32_t len

   )

2. {

3.         uint32_t counter = len;

4.         USART_TypeDef *Usart;

6. if

   (

   fd == STDIN_FILENO

   )

   {

                          

   // stdin from UARTx

7.                 Usart = USART1;

8. }

   else

   {

9. return

   len;

10. }

11. while

    (

    counter-- >

    0

    )

    {

                             

    // Read the character to the buffer from UART

12. while

    (

    USART_GetFlagStatus

    (

    Usart, USART_FLAG_RXNE

    )

    == RESET

    )

    ;

13.                 *ptr = USART_ReceiveData

    (

    Usart

    )

    ;

14.                 ptr++;

15. }

16. return

    len;

17. }

[kostalexis]

Posted on October 18, 2011 at 09:59Thanks man!