Printf and Scanf

hanaabdelhakim · April 27, 2023, 11:10pm

I was trying to use printf/scanf in one of the tutorials instead of putch and my read since I fount it in the make file, but it didnt work. Can you please suggest how I can send and receive data using printf and scanf?

Thanks

jpthibault · April 28, 2023, 2:27pm

Are you looking for something like this?

github.com

newaetech/chipwhisperer/blob/develop/hardware/victims/firmware/simpleserial-trace/simpleserial-trace.c#L179


      
              ETM->TRACEIDR = 1; // Trace bus ID for TPIU
              ETM->FFLR = 0; // Stall processor when FIFO is full
              ETM->TEEVR = 0x000150a0;    // EmbeddedICE comparator 0 or 1 (DWT->COMP0 or DWT->COMP1)
              //ETM->TEEVR = 0x00000020;    // EmbeddedICE comparator 0 only
              //ETM->TEEVR = 0x00000021;    // EmbeddedICE comparator 1 only
              ETM->TESSEICR = 0xf; // set EmbeddedICE watchpoint 0 as a TraceEnable start resource.
              ETM->TECR1 = 0; // tracing is unaffected by the trace start/stop logic
              ETM_TraceMode();
          }
          
          
void print(const char *ptr)
          {
              while (*ptr != (char)0)
              {
                  putch(*ptr);
                  ptr++;
              }
          }
          
          

          
// Print a given string to ITM with 8-bit writes.

For “scanf”, look to any of our target firmware and how they usesimpleserial_get().