blink_any.c

/**
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "pico/stdlib.h"
#include "pico/binary_info.h"

#ifdef CYW43_WL_GPIO_LED_PIN
#include "pico/cyw43_arch.h"
#endif

// Set an LED_TYPE variable - 0 is default, 1 is connected to WIFI chip
// Note that LED_TYPE == 1 is only supported when initially compiled for
// a board with PICO_CYW43_SUPPORTED (eg pico_w), else the required
// libraries won't be present
bi_decl(bi_program_feature_group(0x1111, 0, "LED Configuration"));
#if defined(PICO_DEFAULT_LED_PIN)
    // the tag and id are not important as picotool filters based on the
    // variable name, so just set them to 0
    bi_decl(bi_ptr_int32(0x1111, 0, LED_TYPE, 0));
    bi_decl(bi_ptr_int32(0x1111, 0, LED_PIN, PICO_DEFAULT_LED_PIN));
#elif defined(CYW43_WL_GPIO_LED_PIN)
    bi_decl(bi_ptr_int32(0x1111, 0, LED_TYPE, 1));
    bi_decl(bi_ptr_int32(0x1111, 0, LED_PIN, CYW43_WL_GPIO_LED_PIN));
#else
    bi_decl(bi_ptr_int32(0x1111, 0, LED_TYPE, 0));
    bi_decl(bi_ptr_int32(0x1111, 0, LED_PIN, 25));
#endif

#ifndef LED_DELAY_MS
#define LED_DELAY_MS 250
#endif

// Perform initialisation
int pico_led_init(void) {
    if (LED_TYPE == 0) {
        // A device like Pico that uses a GPIO for the LED so we can
        // use normal GPIO functionality to turn the led on and off
        gpio_init(LED_PIN);
        gpio_set_dir(LED_PIN, GPIO_OUT);
        return PICO_OK;
#ifdef CYW43_WL_GPIO_LED_PIN
    } else if (LED_TYPE == 1) {
        // For Pico W devices we need to initialise the driver etc
        return cyw43_arch_init();
#endif
    } else {
        return PICO_ERROR_INVALID_DATA;
    }
}

// Turn the led on or off
void pico_set_led(bool led_on) {
    if (LED_TYPE == 0) {
        // Just set the GPIO on or off
        gpio_put(LED_PIN, led_on);
#ifdef CYW43_WL_GPIO_LED_PIN
    } else if (LED_TYPE == 1) {
        // Ask the wifi "driver" to set the GPIO on or off
        cyw43_arch_gpio_put(LED_PIN, led_on);
#endif
    }
}

int main() {
    int rc = pico_led_init();
    hard_assert(rc == PICO_OK);
    while (true) {
        pico_set_led(true);
        sleep_ms(LED_DELAY_MS);
        pico_set_led(false);
        sleep_ms(LED_DELAY_MS);
    }
}