mirror of
https://github.com/zephyrproject-rtos/zephyr
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e18fcbba5a
Now that device_api attribute is unmodified at runtime, as well as all the other attributes, it is possible to switch all device driver instance to be constant. A coccinelle rule is used for this: @r_const_dev_1 disable optional_qualifier @ @@ -struct device * +const struct device * @r_const_dev_2 disable optional_qualifier @ @@ -struct device * const +const struct device * Fixes #27399 Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
66 lines
1.4 KiB
C
66 lines
1.4 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 <drivers/gpio.h>
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#include <drivers/uart.h>
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#include <device.h>
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#define RESET_PIN CONFIG_BOARD_NRF52840_GPIO_RESET_PIN
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/* Must be a pin from 17 to 23.
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* Only those can be connected to the nRF52840.
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*/
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BUILD_ASSERT(RESET_PIN > 16 && RESET_PIN < 24,
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"Selected pin is not connected to nRF52840");
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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 *port;
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port = device_get_binding(DT_LABEL(DT_NODELABEL(gpio0)));
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if (!port) {
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return -EIO;
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}
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/* Configure pin as output and initialize it to low. */
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err = gpio_pin_configure(port, RESET_PIN, GPIO_OUTPUT_LOW);
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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
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* pulled low again before running to main to ensure
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* that it won't send any data until the H4 device
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* is setup and ready to receive.
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*/
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err = gpio_pin_set(port, RESET_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 (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_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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