How to received string in interrupt mode and which buffer i need to use for that

manoj0306 · July 18, 2024, 12:52pm

Hi ,

how to stored uart recieving data in interrupt mode byte by byte using Queue or any different mechanism for that to save recieving string into the buffer in interrupt mode

carlk3 · July 18, 2024, 4:33pm

Here’s one example:

github.com

carlk3/FreeRTOS-FAT-CLI-for-RPi-Pico/blob/7f9ede428c8c0a8f8362208ee3d53aebe5333f14/examples/command_line/src/stdio_cli.c#L32


      
          #include "hardware/rtc.h"
          #include "pico/util/datetime.h"
          //
          #include "command.h"
          #include "sd_card.h"
          #include "task_config.h"
          #include "unmounter.h"
          //
          #include "stdio_cli.h"
          
          static void callback(void *ptr) {
              TaskHandle_t task = ptr;
              myASSERT(task);
              /* The xHigherPriorityTaskWoken parameter must be initialized to pdFALSE as
               it will get set to pdTRUE inside the interrupt safe API function if a
               context switch is required. */
              BaseType_t xHigherPriorityTaskWoken = pdFALSE;
          
              /* Send a notification directly to the task to which interrupt processing is
               being deferred. */
              vTaskNotifyGiveIndexedFromISR(

github.com

carlk3/FreeRTOS-FAT-CLI-for-RPi-Pico/blob/7f9ede428c8c0a8f8362208ee3d53aebe5333f14/examples/command_line/src/stdio_cli.c#L91


      
          if (!rtc_running()) printf("RTC is not running.\n");
          datetime_t t = {0, 0, 0, 0, 0, 0, 0};
          rtc_get_datetime(&t);
          char datetime_buf[256] = {0};
          datetime_to_str(datetime_buf, sizeof(datetime_buf), &t);
          printf("%s\n", datetime_buf);
          printf("FreeRTOS+CLI> ");
          stdio_flush();
          
          for (;;) {
              uint32_t nv = ulTaskNotifyTakeIndexed(NOTIFICATION_IX_STDIO,  // uxIndexToWaitOn
                                                    pdTRUE,                 // xClearCountOnExit
                                                    portMAX_DELAY);         // xTicksToWait
              if (nv < 1) continue;
          
              for (;;) {
                  /* Get the character from terminal */
                  int cRxedChar = getchar_timeout_us(0);
                  if (PICO_ERROR_TIMEOUT == cRxedChar) {
                      break;
                  }

github.com

carlk3/FreeRTOS-FAT-CLI-for-RPi-Pico/blob/7f9ede428c8c0a8f8362208ee3d53aebe5333f14/examples/command_line/src/command.cpp#L696


      
                      if (0 == strcmp(cmds[i].command, cmdn)) {                

                          // run the command

                          (*cmds[i].function)(argc, argv);

                          break;

                      }

                  }

                  if (count_of(cmds) == i) printf("Command \"%s\" not found\n", cmdn);

              }

          }

          

          void process_stdio(int cRxedChar) {

              static char cmd[256];

              static size_t ix;

          

              if (!(0 < cRxedChar && cRxedChar <= 0x7F))

                  return;  // Not dealing with multibyte characters

              switch (cRxedChar) {

                  case 3:  // Ctrl-C

                      SYSTEM_RESET();

                      break;

                  case 27:  // Esc