led.c

См. документацию.

/**
 * Copyright (c) 2012, Roy van Dam <roy@vandam-innovations.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "led.h"

void assert_param(bool value) {
    if (value == false) {
        // XXX: Debug on failed assertion.
    }
}

volatile unsigned long system_tick_count = 0;

void SysTick_Handler(void) {
    system_tick_count++;
}

void SysTick_Delay(unsigned long ms) {
    unsigned long target_tick_count = system_tick_count + ms;

    // Handle timer overflow
    if (target_tick_count < system_tick_count)
        while (system_tick_count > target_tick_count);

    // Wait for time to pass
    while (system_tick_count < target_tick_count);
}

void Led_Init(LedId led) {
    GPIO_InitTypeDef GPIO_Context;

    RCC_APB2PeriphClockCmd(led_context[led].clock, ENABLE);

    GPIO_Context.GPIO_Pin = led_context[led].pin;
    GPIO_Context.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Context.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(led_context[led].port, &GPIO_Context);
}

void Led_Enable(LedId led) {
    led_context[led].port->BSRR = led_context[led].pin;
}
void Led_Disable(LedId led) {
    led_context[led].port->BRR = led_context[led].pin;
}

int main(void) {
    Led_Init(LED0);
    Led_Disable(LED0);

    Led_Init(LED1);
    Led_Disable(LED1);

    while(1) {
        Led_Enable(LED1);
        SysTick_Delay(500);
        Led_Disable(LED1);
        SysTick_Delay(500);
    }
}