I have a question related to quitting the scheduler loop in the Xtensa FreeRTOS port: Freertos doc says that in order to quit the RTOS scheduling loop vTaskEndScheduler must be called Please see https://www.freertos.org/a00133.html vTaskEndScheduler is implemented in term of vPortEndScheduler Xtensa port has this implementation for vPortEndScheduler void vPortEndScheduler( void ) { /* It is unlikely that the Xtensa port will get stopped. If required simply disable the tick interrupt here. */ } Having ask my HW buddy, the tick interrupt for us is interrupt 2 and 3, ~~~ Interrupt | Type |Level | BInterrupt | Pin Source ———-+——–+——+————+———– 0 | Level | 1 | 0 | Tied low 1 | Edge | 3 | 1 | Tied low 2 | Timer.0| 2 | | Internal 3 | Timer.1| 3 | | Internal ~~~ so I did something like this ~~~ void vPortEndScheduler( void ) { /* It is unlikely that the Xtensa port will get stopped. If required simply disable the tick interrupt here. */ uint32_t ints = xthal_get_intenable(); __dsp_printf(“1) xthal_get_intenable 0x%xn”, ints);

xt_ints_off(1 << 2);
xt_ints_off(1 << 3);
ints = xthal_get_intenable();
__dsp_printf("2) xthal_get_intenable 0x%xn", ints);

} ~~~ that gives me ~~~ 1) xthalgetintenable 0x4 2) xthalgetintenable 0x0 ~~~ So it would seem that the interrupt is OFF. Unfortunately_frxt_dispatch keeps running. Am I making a mistake? Would it be possible to have you guys double check this, please? Thanks in advance guido

Hi guido, I have implemented ending the scheduler for several microcontrollers. Basically I’m using a combination of setjmp and longjmp. I have documented it in https://mcuoneclipse.com/2019/01/20/freertos-how-to-end-and-restart-the-scheduler/ which has links to the implementation on GitHub. I think you can do the same for your port. I hope this helps, Erich

Hello Erich! Thanks so much for the very detail and well documented work you did: I tested on my xtensa hifi4 and does work OK! Thank you so much guido