69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Copyright (c) 2019 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 <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/uart.h>
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/kernel.h>
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#define RESET_NODE DT_NODELABEL(nrf52840_reset)
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#if DT_NODE_HAS_STATUS_OKAY(RESET_NODE)
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#define RESET_GPIO_CTRL DT_GPIO_CTLR(RESET_NODE, gpios)
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#define RESET_GPIO_PIN DT_GPIO_PIN(RESET_NODE, gpios)
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#define RESET_GPIO_FLAGS DT_GPIO_FLAGS(RESET_NODE, gpios)
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int bt_hci_transport_setup(const struct device *h4)
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{
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int err;
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char c;
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const struct device *const port = DEVICE_DT_GET(RESET_GPIO_CTRL);
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if (!device_is_ready(port)) {
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return -EIO;
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}
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/* Configure pin as output and initialize it to inactive state. */
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err = gpio_pin_configure(port, RESET_GPIO_PIN,
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RESET_GPIO_FLAGS | GPIO_OUTPUT_INACTIVE);
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if (err) {
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return err;
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}
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/* Reset the nRF52840 and let it wait until the pin is inactive again
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* before running to main to ensure that it won't send any data until
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* the H4 device is setup and ready to receive.
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*/
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err = gpio_pin_set(port, RESET_GPIO_PIN, 1);
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if (err) {
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return err;
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}
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/* Wait for the nRF52840 peripheral to stop sending data.
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*
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* It is critical (!) to wait here, so that all bytes
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* on the lines are received and drained correctly.
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*/
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k_sleep(K_MSEC(10));
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/* Drain bytes */
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while (h4 && uart_fifo_read(h4, &c, 1)) {
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continue;
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}
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/* We are ready, let the nRF52840 run to main */
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err = gpio_pin_set(port, RESET_GPIO_PIN, 0);
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if (err) {
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return err;
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}
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return 0;
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}
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#endif /* DT_NODE_HAS_STATUS_OKAY(RESET_NODE) */
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