/*
 * "Flames"
 * Boeing-inspired GAT Addon Firmware
 * by true
 *
 * version 0.0.1
 *
 * 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.
 *
 * notes:
 *
 * - last 2K of flash memory is reserved for configuration storage
 */

#include <ch32v20x.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/touch.h"
#include "src/ui.h"


void systick_init(void)
{
    SysTick->CMP = (SystemCoreClock / 1024) - 1;    // we want a 1024Hz 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
}

void gpio_init()
{
    GPIO_InitTypeDef gpio = {0};

    gpio.GPIO_Speed = GPIO_Speed_2MHz;

    // unused pins (PD0=SWI2C_SDA, PD1=NC)
    gpio.GPIO_Mode = GPIO_Mode_IPD;
    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_Init(GPIOD, &gpio);

    // unused PORTA pins (PA0=NC, PA1=NC, PA5=NC, PA9=NC, PA15=NC)
    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_5 | GPIO_Pin_9 | GPIO_Pin_15;
    GPIO_Init(GPIOA, &gpio);

    // unused PORTB pins (PB3=NC, PB4=SWI2C_SCL)
    gpio.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4;
    GPIO_Init(GPIOB, &gpio);

    // buttons (PA2=BTN_UP, PA3=BTN_DN)
    gpio.GPIO_Mode = GPIO_Mode_IPU;
    gpio.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_Init(GPIOA, &gpio);

    // lightsense cathode (PA4=LSENS_K)
    gpio.GPIO_Mode = GPIO_Mode_Out_PP;
    gpio.GPIO_Pin = GPIO_Pin_4;
    GPIO_Init(GPIOA, &gpio);

    // lightsense anode (PB4=LSENS_A)
    gpio.GPIO_Mode = GPIO_Mode_Out_PP;
    gpio.GPIO_Pin = GPIO_Pin_5;
    GPIO_Init(GPIOA, &gpio);

    // rear LED (6=T3C1, 7=T3C2)
    gpio.GPIO_Mode = GPIO_Mode_AF_PP;
    gpio.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_Init(GPIOA, &gpio);

    // rear LED (0=T3C3, 1=T3C4)
    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_Init(GPIOB, &gpio);

    // I2C SCL, SCA for on-board devices
    gpio.GPIO_Mode = GPIO_Mode_AF_OD;
    gpio.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_Init(GPIOB, &gpio);
}

int main(void)
{
    // configure core
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    SystemCoreClockUpdate();

    // enable peripheral clocks
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM3  | RCC_APB1Periph_I2C1  |
                            RCC_APB1Periph_PWR, ENABLE);
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO  | RCC_APB2Periph_GPIOA |
                            RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD |
                            RCC_APB2Periph_ADC1  | RCC_APB2Periph_ADC2, ENABLE);

    // configure gpio pins
    gpio_init();

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

    // configure hardware
    adc_init();         // configure ADC1 for lightsense, also configures ADC clock divider
    btn_init();         // configures hardware physical buttons
    led_init();         // configure matrix IC as well as boeing PWM

    // by default, top LED is in light sense mode
    adc_set_mode_lsens(LSENS_READING_IDLE);

    // 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
        if ((ticnt & 0x7) == 0) {
            ui_render();
        }
    }
}