This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

printf problem (nothing in Debug (printf) window)

Dafdouf Houssem over 15 years ago

Hi all,

I have nothing in the Debug (printf) window dialog when I use the printf instruction. (UART #x too)

Is there something to initialize, or include a specific header?
How the printf could be assigned to a specific port?

I'm simulating a simple programm running on an STM32 Âµc

thx

Parents

0 Thorsten de Buhr

over 15 years ago in reply to Dafdouf Houssem

np, have fun :-)

There is also a back channel implemented, where text typed in the ITM/Printf Viewer Window is sent to a memory location on the target (if a special Variable Name is found).

You may use it as follows:
(Example, if you don't use RTX, just use the ITMRx_Getc() )

#include <RTL.h>                      /* RTX kernel functions & defines      */
#include "itm_rx.h"
#include "rx_buffer.h"

volatile unsigned int ITM_RxBuffer;        // 0x5AA55AA5 is handshake value

// ITM Serial Window Input Watch and Init function
void ITMRx_InInit(void) {
  ITM_RxBuffer = 0x5AA55AA5;
}

int ITMRx_Getc(void) {
  int recChar=0;                                // zero is default if no new char recv

  if(ITM_RxBuffer != 0x5AA55AA5) {
    recChar = ITM_RxBuffer & 0xff;
    ITM_RxBuffer = 0x5AA55AA5;
  }
  return(recChar);
}

__task void ITMRx_GetcWatch(void) {
  int tmp;

  os_itv_set (1);    // 10 ms

  while(1) {
    tmp = ITMRx_Getc();
    if(tmp) itm_rxBuffer_putchar(tmp & 0xFF);               // write buffer
    os_itv_wait ();
  }
}

Note:
For usage with scanf() (fgetc() - retarget) you should add a blocking wrapper calling ITMRx_Getc(), because it returns 0 when no new char is avaiable.

BR,
/th.

Reply