Using TWI with PPI does not call the TWI handler.

RE: Using TWI with PPI does not call the TWI handler.

Neuro_Rouh — Wed, 26 May 2021 10:34:41 GMT

OOPS!

It seems that the problem is not due to the PPI channel, I had not notice that even in the normal mode, the I2C sometimes returns error, I dont know why!

After calling the ret_code_t err_code = nrf_drv_twi_rx(), I get ERROR 3 [NRF_ERROR_INTERNAL] , but sometimes it works fine, I should work a bit more on it while any recommendation is appreciated.

P.S. my target is an LM75 module.

RE: Using TWI with PPI does not call the TWI handler.

Neuro_Rouh — Wed, 26 May 2021 05:06:17 GMT

[quote userid="2111" url="~/f/nordic-q-a/75519/using-twi-with-ppi-does-not-call-the-twi-handler/311453#311453"]

Are you checking the error code from nrf_drv_ppi_channel_assign() and nrf_drv_ppi_channel_fork_assign()?

Are you calling nrf_drv_ppi_channel_enable() afterwards?

[/quote]

Yes I do, I dont have problem with the nrf_drv_ppi_channel_assign(), as my PPI channel triggers ADC channel , as it is supposed to.

and I have called the APP_ERROR_CHECK(err_code); after nrf_drv_ppi_channel_fork_assign(), no error pops up.

[quote userid="2111" url="~/f/nordic-q-a/75519/using-twi-with-ppi-does-not-call-the-twi-handler/311453#311453"]Maybe take a look at this example in general:[/quote]

The example you shared is basically on GPIOTE module, as I mentioned I have successfully connected a TIMER event to a SAADC task, so in general I know how to configure a PPI channel, respectfully I need a more specific help on configuring PPI to run a TWI task.

RE: Using TWI with PPI does not call the TWI handler.

Kenneth — Tue, 25 May 2021 12:31:59 GMT

Are you checking the error code from nrf_drv_ppi_channel_assign() and nrf_drv_ppi_channel_fork_assign()?

Are you calling nrf_drv_ppi_channel_enable() afterwards?

Maybe take a look at this example in general:
https://github.com/bjornspockeli/nRF52_ppi_timper_gpiote_example/blob/master/main.c