RTEMS | Issuearm/raspberrypi: Serial port no input possible (#5260)

[Heinz Junkes (@junkes)]

Heinz Junkes commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5260#note_123248


If I define my own poll routine:

```
#define PL011_UART_BASE 0x3F201000
typedef int (*BSP_polling_getchar_function_type)(void);
extern BSP_polling_getchar_function_type BSP_poll_char;

static int pl011_poll_getchar(void)
{
  volatile uint32_t *regs = (volatile uint32_t *) PL011_UART_BASE;
  if (regs[0x18 / sizeof(uint32_t)] & (1 << 4)) { return -1; } // UART_FR_RXFE
  return (regs[0] & 0xFF);
}
```
and let this 'BSP_poll_char' point to :
```
  BSP_poll_char = pl011_poll_getchar;
```
the RTEMS shell reads the input automatically ("/dev/console" ?).
```
#if 1
//   debugger_config();
// Start an rtems shell before main, for debugging RTEMS system issues
    rtems_shell_init("SHLL", RTEMS_MINIMUM_STACK_SIZE * 4,
                     100, "/dev/console",
                     false, true,
                     NULL);
#endif
```
and I can read the input like this:
```
void *readInput(void * arg)
{
  char inputBuffer[MAX_INPUT] = {0};
  while (readActive) {
    printf("Task read new timing value\n");
    int i = 0;
    memset(inputBuffer,0,MAX_INPUT);
    do {
      inputBuffer[i++] = getchar();
      //printf("inputBuffer = %s\n", inputBuffer);
      //printf("inputBuffer[%d-1] = 0x%x\n", i, inputBuffer[i-1]);
    } while (i < MAX_INPUT-1 && inputBuffer[i-1] != 0x0a && inputBuffer[i-1] != 0x0d);
    inputBuffer[i-1] = 0;
    sscanf(inputBuffer,"%d", &newTimingValue);
    if(newTimingValue == 9876) readActive = 0;
    else printf(" New timing value = %d ms\n", newTimingValue);
  }
}
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5260#note_123248
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