examples/platform/nrfconnect/util/DFUTrigger.cpp

/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *    All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#ifndef CONFIG_BOARD_NRF52840DONGLE_NRF52840
#error "The command for triggerring the DFU is available for nRF52840 Dongle only"
#endif

#include <zephyr/drivers/gpio.h>
#include <zephyr/shell/shell.h>

namespace {
constexpr const char * kGPIOController = "GPIO_0";
constexpr gpio_pin_t kGPIOResetPin     = 19;

int cmd_dfu(const struct shell * shell, size_t argc, char ** argv)
{
    // nRF52840 Dongle contains immutable bootloader which supports the DFU over a serial port.
    // Normally, a user must press the Reset button to reboot into the bootloader, but it can
    // also be done programatically by setting an appropriate GPIO pin.

    const device * gpioController = device_get_binding(kGPIOController);

    if (!gpioController)
    {
        shell_fprintf(shell, SHELL_NORMAL, "Cannot find GPIO controller");
        return -ENOEXEC;
    }

    if (gpio_pin_configure(gpioController, kGPIOResetPin, GPIO_OUTPUT))
    {
        shell_fprintf(shell, SHELL_NORMAL, "Cannot configure GPIO reset pin");
        return -ENOEXEC;
    }

    if (gpio_pin_set_raw(gpioController, kGPIOResetPin, 0))
    {
        shell_fprintf(shell, SHELL_NORMAL, "Cannot set GPIO reset pin");
        return -ENOEXEC;
    }

    return 0;
}
} // namespace

SHELL_CMD_ARG_REGISTER(dfu, NULL, "Trigger DFU over serial port", cmd_dfu, 0, 0);