76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* Copyright (c) 2023, Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "spi_nrfx_common.h"
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#include <zephyr/kernel.h>
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#include <nrfx_gpiote.h>
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int spi_nrfx_wake_init(uint32_t wake_pin)
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{
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nrfx_gpiote_input_config_t input_config = {
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.pull = NRF_GPIO_PIN_PULLDOWN,
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};
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uint8_t ch;
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nrfx_gpiote_trigger_config_t trigger_config = {
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.trigger = NRFX_GPIOTE_TRIGGER_HITOLO,
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.p_in_channel = &ch,
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};
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nrfx_err_t res;
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res = nrfx_gpiote_channel_alloc(&ch);
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if (res != NRFX_SUCCESS) {
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return -ENODEV;
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}
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res = nrfx_gpiote_input_configure(wake_pin,
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&input_config,
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&trigger_config,
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NULL);
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if (res != NRFX_SUCCESS) {
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nrfx_gpiote_channel_free(ch);
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return -EIO;
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}
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return 0;
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}
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int spi_nrfx_wake_request(uint32_t wake_pin)
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{
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nrf_gpiote_event_t trigger_event = nrfx_gpiote_in_event_get(wake_pin);
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uint32_t start_cycles;
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uint32_t max_wait_cycles =
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DIV_ROUND_UP(CONFIG_SPI_NRFX_WAKE_TIMEOUT_US *
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CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
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1000000);
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int err = 0;
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/* Enable the trigger (a high-to-low transition) without its interrupt.
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* The expected time to wait is quite short so it is not worth paying
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* the overhead of context switching to handle the interrupt.
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*/
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nrfx_gpiote_trigger_enable(wake_pin, false);
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/* Enable pull-up on the WAKE line. After the slave device sees the
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* WAKE line going high, it will force the line to go low. This will
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* be caught by the enabled trigger and the loop below waits for that.
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*/
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nrf_gpio_cfg_input(wake_pin, NRF_GPIO_PIN_PULLUP);
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start_cycles = k_cycle_get_32();
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while (!nrf_gpiote_event_check(NRF_GPIOTE, trigger_event)) {
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uint32_t elapsed_cycles = k_cycle_get_32() - start_cycles;
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if (elapsed_cycles >= max_wait_cycles) {
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err = -ETIMEDOUT;
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break;
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}
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}
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nrfx_gpiote_trigger_disable(wake_pin);
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nrf_gpio_cfg_input(wake_pin, NRF_GPIO_PIN_PULLDOWN);
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return err;
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}
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