#include "main.h"

#include "ssd1306.h"

#include "config.h"

#include "eeprom_min.h"

#include "gpio.h"

#include "spi.h"

// USB includes

// TODO: Grab buttonpresses with interrupts

// USB Supporting Vars

extern __IO uint8_t Receive_Buffer[64];

extern __IO  uint32_t Receive_length ;

extern __IO  uint32_t length ;

uint8_t Send_Buffer[64];

uint32_t packet_sent=1;

uint32_t packet_receive=1;

enum tempunits {

    TEMP_UNITS_CELSIUS = 0,

    TEMP_UNITS_FAHRENHEIT,

};

// Globalish setting vars

uint8_t boottobrew = 0;

uint8_t temp_units = TEMP_UNITS_CELSIUS;

uint16_t windup_guard = 1;

uint16_t k_p = 1;

uint16_t k_i = 1;

uint16_t k_d = 1;

uint8_t ignore_tc_error  = 0;

// ISR ticks var

volatile uint32_t ticks = 0;

int16_t setpoint_brew = 0;

int16_t setpoint_steam = 0;

// State definition

enum state {

    STATE_IDLE = 0,

    STATE_SETP,

    STATE_SETI,

    STATE_SETD,

    STATE_SETSTEPS,

    STATE_SETWINDUP,

    STATE_SETBOOTTOBREW,

    STATE_SETUNITS,

    STATE_PREHEAT_BREW,

    STATE_MAINTAIN_BREW,

    STATE_PREHEAT_STEAM,

    STATE_MAINTAIN_STEAM,

    STATE_TC_ERROR

};

uint8_t state = STATE_IDLE;

static __IO uint32_t TimingDelay;

// Move to header file

void process();

void machine();

void restore_settings();

void save_settings();

void save_setpoints();

int main(void)

{

    // Init clocks

    SystemInit();

    // Init GPIO

    init_gpio();

    // Turn on power LED

    GPIO_SetBits(LED_POWER);

    // TODO: Awesome pwm of power LED (TIM4_CH4 or TIM11_CH1)

    // Configure 1ms SysTick (change if more temporal resolution needed) 

    RCC_ClocksTypeDef RCC_Clocks;

    RCC_GetClocksFreq(&RCC_Clocks);

    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

    // Init SPI busses

    init_spi();

    // Init OLED over SPI

    ssd1306_Init();

    ssd1306_clearscreen();

    // Check for problems on startup

    if(clock_fail) {

        //ssd1306_DrawStringBig("ERROR: Check Xtal", 2, 0);

        ssd1306_DrawStringBig("NO XTAL", 2, 0);

        delay(1000);

        ssd1306_clearscreen();

    }

    // Init USB

    //Set_System(); // hw_config.h

    //SYSCFG_USBPuCmd(ENABLE);

    //PowerOn();

    // Startup screen 

    ssd1306_DrawString("therm v0.1", 1, 40);

    ssd1306_DrawString("protofusion.org/therm", 3, 0);

    delay(1500);

    ssd1306_clearscreen();

    restore_settings();

    if(boottobrew)

      state = STATE_PREHEAT_BREW; // Go to brew instead of idle if configured thusly

    GPIO_ResetBits(LED_STAT);

    // Main loop

    while(1)

    {

        // Process sensor inputs

        process();

        // Run state machine

        machine(); 

    }

}

// Read temperature and update global temp vars

int32_t temp = 0;

uint8_t temp_frac = 0;

uint8_t state_resume = 0;

void update_temp() {

    // Assert CS

    GPIO_ResetBits(MAX_CS);

    delay(1);

    // This may not clock at all... might need to send 16 bits first

    SPI_I2S_SendData(SPI2, 0xAAAA); // send dummy data

    //SPI_I2S_SendData(SPI2, 0xAA); // send dummy data

    uint16_t temp_pre = SPI_I2S_ReceiveData(SPI2);

    if(temp_pre & 0b0000000000000010) {

        ssd1306_DrawString("Fatal Error", 3, 35);

        state = STATE_TC_ERROR;

    }

    else if(temp_pre & 0b0000000000000001 && !ignore_tc_error) {

        state_resume = state;

#ifndef __MAIN_H

#define __MAIN_H

void TimingDelay_Decrement(void);

void delay(__IO uint32_t nTime);

#endif /* __MAIN_H */