RE: nrf5340dk 8hmz clock output to gpio pin example via gpiote/ppi/timer

Håkon Alseth — Fri, 17 Sep 2021 10:03:53 GMT

Hi,

There was a couple of enable and the timer mode was incorrect. Here's a patched version of your sample:

void main(void)
{
	nrfx_gpiote_init(GPIOTE_INTERRUPT_PRIORITY);



	nrfx_err_t err;
	nrfx_gpiote_out_config_t out_config = NRFX_GPIOTE_CONFIG_OUT_TASK_TOGGLE(false);
	err = nrfx_gpiote_out_init(PIN, &out_config);
	if( err != NRFX_SUCCESS )
	{
      printk("err_code not 0 for nrf_drv_gpiote_in_init");
    }



	nrfx_timer_config_t timer_cfg = NRFX_TIMER_DEFAULT_CONFIG;
	timer_cfg.mode = NRF_TIMER_MODE_TIMER;
	timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
	err = nrfx_timer_init(&m_timer, &timer_cfg, NULL);
	ERROR_STATUS_CHECK(err)

    nrfx_timer_extended_compare(&m_timer, NRF_TIMER_CC_CHANNEL0, DIVIDER_COUNT, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, false);    

    uint8_t channel;
    err =  nrfx_dppi_channel_alloc(&channel);
    nrfx_gpiote_pin_t gpiote_mclk_sync_pin_out = PIN;

 	uint32_t gpiote_mclk_toggle_task_addr = nrfx_gpiote_out_task_addr_get(gpiote_mclk_sync_pin_out); 
	uint32_t timer_event_address = nrfx_timer_event_address_get(&m_timer, NRF_TIMER_EVENT_COMPARE0);
	printk("%x %x\n", gpiote_mclk_sync_pin_out, timer_event_address);

	nrfx_gppi_channel_endpoints_setup(channel, timer_event_address, gpiote_mclk_toggle_task_addr );
	nrfx_gppi_channels_enable(BIT(channel));
	nrfx_gpiote_out_task_enable(PIN);
	nrfx_timer_enable(&m_timer);
}

Kind regards,

Håkon