/*
 * RETRO TECH COMMUNITY
 * GAT Addon Firmware
 * by true
 *
 * code was made for different random addons I designed for dc32,
 * then adapted to each one. so things might be a mess.
 *
 * I had only a few hours on and off over a week to get the code done.
 * lots of shit was copied from demo code and adapted to work. certainly
 * isn't the best way to get this done.
 *
 * I know I could save some power, but seeing as all the badges burn it in
 * LEDs and almost nobody else power optimizes their badge code, who cares?
 *
 * sorry. wasn't procrastination I swear. all the ideas were last minute.
 */

#include <ch32v00x.h>
#include <stdint.h>

#include "src/adc.h"
#include "src/btn.h"
#include "src/config.h"
#include "src/i2c.h"
#include "src/led.h"
#include "src/rand.h"
#include "src/ui.h"


void systick_init(void)
{
    SysTick->CMP = (SystemCoreClock / 2000) - 1;    // we want a 2KHz interrupt
    SysTick->CNT = 0;                               // clear counter
    SysTick->CTLR = 0xF;                            // start counter in /1 mode, enable interrupts, auto-reset counter
    SysTick->SR = 0;                                // clear count comparison flag

    NVIC_EnableIRQ(SysTicK_IRQn);                   // enable interrupt
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    // configure core
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();

    // enable peripheral clocks
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_PWR   | RCC_APB1Periph_I2C1, ENABLE);
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO  | RCC_APB2Periph_GPIOA |
                            RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                            RCC_APB2Periph_ADC1  | RCC_APB2Periph_TIM1, ENABLE);

    // get saved settings
    i2c_init();
    userconf_load();

    // configure hardware
    adc_init();
    btn_init();
    led_init();

    // configure random
    tinymt32_init(&tinymt32_s, DBGMCU_GetCHIPID() | userconf.checksum);

    // configure UI
    ui_init();

    // configure systick interrupt
    systick_init();

    // do system shit
    while(1) {
        __WFI();

        // after sending LEDs, run our program
        // to update the LED buffer for next time
        // we have approx 7ms to render... plenty of time
        if ((ticnt & 0xf) == 3) {
            ui_render();
        }
    }
}