[ARM] How to create a simple menu on FreRTOS ?

[bianchi77]

Guys,

Does anyone of you have experience on creating a simple menu on FreeRTOS ?
I want display a menu on 20x4 LCD,

Thanks

 

[Dan Mills]

Been there, done that, what did you want to know?

I used one thread for the LCD control, blocking on a queue so I could send lcd commands from the rest of the system without blocking while the lcd updated.
I used a second thread to run a 10ms keyboard read routine which did typematic rate and put the keypresses into a keyboard queue, the state machine for this is not hard.
Finally the menu thread blocked on the keyboard and did the usual state machine thing to parse the input and update the displays and system state as appropriate.

Nothing to it really, once you have the LCD and keyboard routines working correctly.

Regard, Dan.

 

[bianchi77]

I have LCD routine ready to go, but the keypad still on the way, how can I make them working on the task ?
I haven't made a lot of task inside it because I want to know how to relate between keypad (button) and LCD,

for example I have,

Menu A <<
Menu B
Menu C

and MCU waiting for the user for pushing the button selecting which Menu he wants,
Up and down button will scroll "<<" up and down and another button for selecting the menu.....any ideas ?
I have a task like this on freeRTOS

int main(void)
{
  prvSetupHardware();
  xTaskCreate( vLCDTask , ( signed char * ) NULL , LCD_TASK_STACK_SIZE , NULL , LCD_TASK_PRIORITY , NULL );

  /* Start the scheduler. */
  vTaskStartScheduler();	

  return 0;
}

for

#define LCD_TASK_STACK_SIZE			( configMINIMAL_STACK_SIZE )
#define LCD_TASK_PRIORITY			( tskIDLE_PRIORITY + 1 )

if I put +2, is it higher priority or lower ?

Thanks

 

[bianchi77]

I have created :

#define LCD_TASK_STACK_SIZE			( configMINIMAL_STACK_SIZE )
#define LCD_TASK_PRIORITY			( tskIDLE_PRIORITY + 1 )

#define LCD_RTC_TASK_STACK_SIZE			( configMINIMAL_STACK_SIZE )
#define LCD_RTC_TASK_PRIORITY			( tskIDLE_PRIORITY +0 )


 xTaskCreate( vLCDTask , ( signed char * ) NULL , LCD_TASK_STACK_SIZE , NULL , LCD_TASK_PRIORITY , NULL );
 xTaskCreate( vRTC_LCDTask , ( signed char * ) NULL , LCD_RTC_TASK_STACK_SIZE , NULL , LCD_RTC_TASK_PRIORITY , NULL );

but it's stopping on vRTC_LCDTask....any ideas, is it because of the priority ?