Interrupt on both PWM edges

RE: Interrupt on both PWM edges

machfax — Wed, 20 Dec 2017 15:12:07 GMT

Jorgen, thnak you I will do it tomorrow, I have to work on the statemachine and after I will implement this PPI with DMA, thanks in advance

RE: Interrupt on both PWM edges

Jørgen Holmefjord — Wed, 20 Dec 2017 14:47:58 GMT

Yes, PPI should work for this. Please have a look at the PPI example in the SDK for details on how to configre PPI.

RE: Interrupt on both PWM edges

machfax — Wed, 20 Dec 2017 09:42:32 GMT

Yes PPI sorry. I think I need to use the PPI to do this. right?

RE: Interrupt on both PWM edges

Jørgen Holmefjord — Tue, 19 Dec 2017 21:26:15 GMT

What do you mean by DMA? EasyDMA is used for peripherals to have direct access to data in memory. Did you mean PPI?

RE: Interrupt on both PWM edges

machfax — Tue, 19 Dec 2017 13:12:35 GMT

Hi Jorgen

Thank you for the information. I think I need to use the DMA functuion like this:

NRF_PWM[x]->EVENTS_PWMPeriod -> NRF_TIMER[y]->TASKS_START NRF_TIMER[y]->EVENTS_COMPARE[0] -> NRF_SAADC->TASKS_START NRF_TIMER[y]->EVENTS_COMPARE[1] ->NRF_SAADC->TASKS_START

Did anybody know an example to configure the EasyDMA for this events above. Or can somebody tell me wehere is the discription to set the EasyDMA Mode correctly.

Thanks a lot

RE: Interrupt on both PWM edges

Jørgen Holmefjord — Tue, 19 Dec 2017 12:50:08 GMT

Hi,

The available events from the PWM peripheral is described here. As you see, there are no event on rising or falling edge. However, you should be able to achieve this using GPIOTE. The GPIOTE peripheral can be configured to trigger interrupts on rising edge, falling edge, or both (toggle). Please checkout the GPIOTE example in the SDK.

Note that you most likely will have to use one extra pin for the GPIOTE, and physically connect this to the PWM signal. I don't think it is possible to configure GPIOTE to trigger interrupts on a pin configured as output.

Best regards,

Jørgen