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main.c
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main.c
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/*
* Copyright (c) 2019 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <nrfx_gpiote.h>
#include <helpers/nrfx_gppi.h>
#if defined(DPPI_PRESENT)
#include <nrfx_dppi.h>
#else
#include <nrfx_ppi.h>
#endif
#include <logging/log.h>
LOG_MODULE_REGISTER(nrfx_sample, LOG_LEVEL_INF);
#define INPUT_PIN DT_GPIO_PIN(DT_ALIAS(sw0), gpios)
#define OUTPUT_PIN DT_GPIO_PIN(DT_ALIAS(led0), gpios)
static void button_handler(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
LOG_INF("GPIO input event callback");
}
void main(void)
{
LOG_INF("nrfx_gpiote sample on %s", CONFIG_BOARD);
nrfx_err_t err;
/* Connect GPIOTE_0 IRQ to nrfx_gpiote_irq_handler */
IRQ_CONNECT(DT_IRQN(DT_NODELABEL(gpiote)),
DT_IRQ(DT_NODELABEL(gpiote), priority),
nrfx_isr, nrfx_gpiote_irq_handler, 0);
/* Initialize GPIOTE (the interrupt priority passed as the parameter
* here is ignored, see nrfx_glue.h).
*/
err = nrfx_gpiote_init(0);
if (err != NRFX_SUCCESS) {
LOG_ERR("nrfx_gpiote_init error: %08x", err);
return;
}
nrfx_gpiote_in_config_t const in_config = {
.sense = NRF_GPIOTE_POLARITY_HITOLO,
.pull = NRF_GPIO_PIN_PULLUP,
.is_watcher = false,
.hi_accuracy = true,
.skip_gpio_setup = false,
};
/* Initialize input pin to generate event on high to low transition
* (falling edge) and call button_handler()
*/
err = nrfx_gpiote_in_init(INPUT_PIN, &in_config, button_handler);
if (err != NRFX_SUCCESS) {
LOG_ERR("nrfx_gpiote_in_init error: %08x", err);
return;
}
nrfx_gpiote_out_config_t const out_config = {
.action = NRF_GPIOTE_POLARITY_TOGGLE,
.init_state = 1,
.task_pin = true,
};
/* Initialize output pin. SET task will turn the LED on,
* CLR will turn it off and OUT will toggle it.
*/
err = nrfx_gpiote_out_init(OUTPUT_PIN, &out_config);
if (err != NRFX_SUCCESS) {
LOG_ERR("nrfx_gpiote_out_init error: %08x", err);
return;
}
nrfx_gpiote_in_event_enable(INPUT_PIN, true);
nrfx_gpiote_out_task_enable(OUTPUT_PIN);
LOG_INF("nrfx_gpiote initialized");
/* Allocate a (D)PPI channel. */
#if defined(DPPI_PRESENT)
uint8_t channel;
err = nrfx_dppi_channel_alloc(&channel);
#else
nrf_ppi_channel_t channel;
err = nrfx_ppi_channel_alloc(&channel);
#endif
if (err != NRFX_SUCCESS) {
LOG_ERR("(D)PPI channel allocation error: %08x", err);
return;
}
/* Configure endpoints of the channel so that the input pin event is
* connected with the output pin OUT task. This means that each time
* the button is pressed, the LED pin will be toggled.
*/
nrfx_gppi_channel_endpoints_setup(channel,
nrfx_gpiote_in_event_addr_get(INPUT_PIN),
nrfx_gpiote_out_task_addr_get(OUTPUT_PIN));
/* Enable (D)PPI channel. */
#if defined(DPPI_PRESENT)
err = nrfx_dppi_channel_enable(channel);
#else
err = nrfx_ppi_channel_enable(channel);
#endif
if (err != NRFX_SUCCESS) {
LOG_ERR("Failed to enable (D)PPI channel, error: %08x", err);
return;
}
LOG_INF("(D)PPI configured, leaving main()");
}