Trigger PWM using nrf_drv_pwm.h and then go to bootloader without interrupting PWM sequence

RE: Trigger PWM using nrf_drv_pwm.h and then go to bootloader without interrupting PWM sequence

Hung Bui — Wed, 20 Dec 2023 12:53:51 GMT

Hi Olof,
You can find this in the datasheet of the chip:

Any kind of reset would reset the peripherals. So there isn't any option that you can reset the chip without affecting the PWM peripheral.

What you are driving the PWM for ? Is it possible to have a short interrupt when switching to the bootloader from the application ?
You can try to start PWM right at the beginning of the bootloader so that there will be a very short interrupt in the PWM output, should be just a few ms.

If it's the hard requirement that it should not have any interrupt at all, you may want to think about jumping to the bootloader without doing a reset. But that would be quite more complex to be able to run the bootloader without resetting the chip.

RE: Trigger PWM using nrf_drv_pwm.h and then go to bootloader without interrupting PWM sequence

Olof Johnsson — Wed, 20 Dec 2023 08:35:59 GMT

Hi!

- nRF5_SDK_17.1.0

- (void)nrf_drv_pwm_simple_playback(&m_pwm1, &seq_green, 1, NRF_DRV_PWM_FLAG_STOP);

- nordic bootloader

- sd_nvic_SystemReset();

RE: Trigger PWM using nrf_drv_pwm.h and then go to bootloader without interrupting PWM sequence

Hung Bui — Tue, 19 Dec 2023 14:14:19 GMT

Hi Olof,

Could you give some more information on:

- Which SDK you are using ?

- How do you do the PWM sequence in your application now ?

- Do you use our bootloader or you are writing your own bootloader ?

- When you switch from the application to the bootloader, did you do a reset ?