#include "stm32f4xx_rcc.h"
#include "led.h"
#include "lcd.h"

volatile uint32_t system_tick_cnt;

void system_tick_init(void)
{
    RCC_ClocksTypeDef rcc_clocks;

    system_tick_cnt = 0;
    RCC_GetClocksFreq(&rcc_clocks);
    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
    SysTick_Config(rcc_clocks.HCLK_Frequency / 1000);
}

void led_loop(void)
{
    static uint32_t tick = 0;

    if (system_tick_cnt - tick > 500) {
        led_toggle();
        tick = system_tick_cnt;
    }
}

void system_init(void)
{
    led_init();
    system_tick_init();
    lcd_init();
}

int main(void)
{
    system_init();
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
    SCB->VTOR = 0x08000000;
    __enable_irq();
    while (1) {
        led_loop();
        lcd_loop();
    }
    return 0;
}

void SysTick_Handler(void)
{
    system_tick_cnt++;
}