CODEWITHSUNDEEP
cembeddedtaskesp32freertos
Lawliet
Lawliet

Reputation: 77

FreeRTOS | Passing user entered character to a task

I was working on the ESP-32 with FreeRTOS, What I was trying to achieve is , I want to pass the character entered by the user to a task.. And the following piece of code is what I have written and which is not working as expected,

#include <stdio.h>

#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

void task(void* pvParameters){
  char* data;
  data = (char *) pvParameters;
  while (true)
  {
    printf("%s\n", data);
    vTaskDelay(2000 / portTICK_PERIOD_MS);
  }
}

void app_main(void){
  
  char c = 0;
  char * data = "Hello";
  while (c != '\n')
  {
    c = getchar();
    if(c != 0xff){
      data = &c ;
      printf(" The entered %c\n", c);
      printf(" The data entered %c\n", *data);
    }
    vTaskDelay(100/portTICK_PERIOD_MS);
  }
  xTaskCreate(task, "task1", 4096, (void*) data, 1, NULL);
}

What is the mistake I am making here.

Upvotes: 0

Views: 724

Answers (2)

Richard
Richard

Reputation: 3246

Is app_main() a task? If not you cannot call vTaskDelay() in it as the scheduler is not running there is nothing to delay.

Are you just trying to pass a stream of input characters to a task? If so then a stream buffer might be the most appropriate https://www.freertos.org/RTOS-stream-buffer-example.html

On the other hand, you might just be trying to pass one set of data to the task when the task is created?

Upvotes: 0

0___________
0___________

Reputation: 67820

For example usuing queues:

In the task you wait for the queue. In the user interface task you post the queue.

BTW your code is wrong in many other ways. Is full of UBs. I would advice to start from the C book, then learn how communication between task should be done and eventually to start with freeRTOS.

Upvotes: 1

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