Using Timer 2 in GPIOTE sample on NRF SDK 11

[Ron]

I was playing around with the gpiote example under exaples/peripheral/gpiote. The example uses a timer, ppi, and gpiote to blink an led. By default, the app uses Timer 0 and that works well. If i were to change switch to Timer 1 or Timer 2 it doesn't seem to work. I did change the nrf_drv_config.h file to enable those extra timers. Is there something else I have to do to use either Timer 1 or Timer 2?

[Susheel Nuguru]

The value given in led_blinking_setup:nrf_drv_timer_extended_compare ->200 *1000 = 30D40 does not fit into 16-bit timer1 and timer2.

Change the values in nrf_drv_config.h to

#define TIMER1_CONFIG_FREQUENCY    NRF_TIMER_FREQ_125kHz
#define TIMER2_CONFIG_FREQUENCY    NRF_TIMER_FREQ_125kHz

and instead of writing 200 *1000 in led_blinking_setup:nrf_drv_timer_extended_compare you need to write 125000/2 = 0Xf424. So your LED will blink every half second.

[Ron]

Great thanks. I did try changing that count to adjust for 16 bits but I didn't think to change the frequency.