I have figured out a way to realize IR communication,it is same with the way to drive WS2812 with SPI.
[ I can use PWM peripheral and should use it,for I need to change the duty cycle sometime.I will update later. Can't use it : can't change the time interval. DMA does not support timer. I was stunned by myself. Though I can't change the duty cycle, I will use it at this moment. ]
I want to compose the time interval control together: you can only trigger once in many seconds.
I have studied the datasheet, no available mechanism to finish it,so ,I need hardware to support.
No way to disable a Pin with PPI/GPIOTE,the P-MOS switch will do the job,which can be controlled by GPIOTE.
The workflow:
set Pin_Trig IN with Pull
stop Timer_ShotDelay
Enable_Trig_Input
...... -> Pin_Trig low(event)
->PPI->(task)Disable_Trig_Input
->PPI->(task)SPIM TX {...... ->SPIM endTX(event)}
->PPI->(task)Timer_ShotDelay start ... ->Timer_ShotDelay timeout(event)
->PPI->(task)Enable_Trig_Input
Will it work?
Do I missed anything?
