#include "main.h"

#include "stm32l100c_discovery.h"

#include "ssd1306.h"

// USB includes

#include "hw_config.h"

#include "usb_lib.h"

#include "usb_desc.h"

#include "usb_pwr.h"

#define LED_POWER GPIOB,GPIO_Pin_9

#define LED_STAT  GPIOA,GPIO_Pin_15

#define MAX_CS GPIOB,GPIO_Pin_12

// TODO: Grab buttonpresses with interrupts

#define SW_BTN  GPIOB, GPIO_Pin_3

#define SW_UP   GPIOB, GPIO_Pin_7

#define SW_DOWN GPIOB, GPIO_Pin_6

#define SW_LEFT GPIOB, GPIO_Pin_5

#define SW_RIGHT GPIOB, GPIO_Pin_4

// 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;

char* itoa(int16_t i, char b[]){

    char const digit[] = "0123456789";

    char* p = b;

    if(i<0){

        *p++ = '-';

        i *= -1;

    }

    uint16_t shifter = i;

    do{ //Move to where representation ends

        ++p;

        shifter = shifter/10;

    }while(shifter);

    *p = '\0';

    do{ //Move back, inserting digits as you go

        *--p = digit[i%10];

        i = i/10;

    }while(i);

    return b;

}

static __IO uint32_t TimingDelay;

// Move to header file

void init_gpio();

void init_spi();

void process();

void machine();

int main(void)

{

    // Init clocks

    SystemInit();

    init_gpio();

    // Init USB

    //Set_USBClock();

    //USB_Interrupts_Config();

    //USB_Init();

    GPIO_SetBits(LED_POWER);

    RCC_ClocksTypeDef RCC_Clocks;

    // SysTick end of count event each 1ms

    RCC_GetClocksFreq(&RCC_Clocks);

    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

    GPIO_ResetBits(LED_STAT);

    Delay(100);

    GPIO_SetBits(LED_POWER);

    Delay(500);

    GPIO_ResetBits(LED_POWER);

    init_spi();

    ssd1306_Init();

    ssd1306_block_write();

    ssd1306_DrawString("therm 0.1", 0, 40);

    ssd1306_DrawString("Status: Idle", 2, 40);

  //  ssd1306_block_write();

    ssd1306_test();

    uint8_t toggle = 0;

    int16_t temp = -231;

    while(1)

    {

        //ssd1306_block_write();

        // Process sensor inputs [TODO: 5hz?]

        process();

        // Run state machine [TODO: 50hz?]

        machine(); 

        // probably just passed the actual port

        // TODO: Grab buttonpresses with interrupts

        uint8_t sw_btn = GPIO_ReadInputDataBit(SW_BTN);

        //uint8_t sw_up = GPIO_ReadInputDataBit(SW_UP);

        //uint8_t sw_down = GPIO_ReadInputDataBit(SW_DOWN);

        //uint8_t sw_left = GPIO_ReadInputDataBit(SW_LEFT);

        //uint8_t sw_right = GPIO_ReadInputDataBit(SW_RIGHT);

        if(!sw_btn) {

            GPIO_ToggleBits(LED_STAT);

            if(!toggle) {

                GPIO_SetBits(GPIOB, GPIO_Pin_13);

                toggle = ! toggle;

            }

            else  {

                GPIO_ResetBits(GPIOB, GPIO_Pin_13);

                toggle = ! toggle;

            }    

        }

        GPIO_SetBits(LED_POWER);

        Delay(50);

        GPIO_ResetBits(LED_POWER);

        Delay(50);

    }

}

int32_t temp = 0;

int32_t setpoint = 0;

int32_t p = 1;

int32_t i = 1;

int32_t d = 1;

// Process things

void process()

{

    // 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);

    }

    else if(temp_pre & 0b0000000000000001) {

        ssd1306_DrawString("TC Fault", 3, 35);

    }

    else {

        ssd1306_DrawString("TempSense OK", 3, 35);

    }

    uint8_t sign = temp >> 15;// top bit is sign

    temp_pre = temp_pre >> 2; // Drop 2 lowest bits

    uint8_t frac = temp_pre & 0b11; // get fractional part

    frac *= 25; // each bit is .25 a degree, up to fixed point

    temp_pre = temp_pre >> 2; // Drop 2 fractional bits 

    int16_t temp = 0;

    if(sign) {

        temp = -temp_pre;

    }

    else {

        temp = temp_pre;

    }

    // Deassert CS

    Delay(1);

    GPIO_SetBits(MAX_CS);

    if(temp > 0) {

        GPIO_SetBits(LED_STAT);

    }

    char tempstr[9];

    itoa(temp_pre, tempstr);

    ssd1306_DrawString("Temp: ", 1, 40);

    ssd1306_DrawString("    ", 1, 70);

    ssd1306_DrawString(tempstr, 1, 70);

    itoa(frac, tempstr);

    ssd1306_DrawString("  ", 1, 90);

    ssd1306_DrawString(tempstr, 1, 90);

    // TODO: Add calibration offset (linear)

    // Perform PID calculations

    // Write output to SSR

}

enum state {

    STATE_IDLE = 0,

    STATE_SETP,

    STATE_SETI,

    STATE_SETD,

    STATE_PREHEAT_BREW,

    STATE_MAINTAIN_BREW,

    STATE_PREHEAT_STEAM,

    STATE_MAINTAIN_STEAM,

};

uint8_t state = STATE_IDLE;

// State machine

void machine()

{

    switch(state)

    {

        // Idle state

        case STATE_IDLE:

        {

            // Write text to OLED

            // [ therm :: idle ]

            ssd1306_DrawString("therm :: idle ", 0, 40);

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_SETP;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_SETP:

        {

            // Write text to OLED

            // [ therm :: set p ]

            // [ p = 12         ]

            ssd1306_DrawString("therm :: set p", 0, 40);

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_SETI;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_SETI:

        {

            // Write text to OLED

            // [ therm :: set i ]

            // [ i = 12         ]

            ssd1306_DrawString("therm :: set i", 0, 40);

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_SETD;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_SETD:

        {

            // Write text to OLED

            // [ therm :: set d ]

            // [ d = 12         ]

            ssd1306_DrawString("therm :: set d", 0, 40);

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            if(temp >= setpoint) {

                state = STATE_MAINTAIN_STEAM;

            }

        } break;

        case STATE_MAINTAIN_STEAM:

        {

            // Write text to OLED

            // [ therm : ready to steam ]

            // [ 30 => 120 C            ]

            ssd1306_DrawString("therm :: Sready", 0, 40);

            // Button handler

            if(!GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

        // Something is terribly wrong

        default:

        {

            ssd1306_DrawString("therm :: BAD BAD", 0, 40);

            state = STATE_IDLE;

        } break;

    }

}

/**

  * @brief  Inserts a delay time.

  * @param  nTime: specifies the delay time length, in 1 ms.

  * @retval None

  */

void Delay(__IO uint32_t nTime)

{

  TimingDelay = nTime;

  while(TimingDelay != 0);

}

/**

  * @brief  Decrements the TimingDelay variable.

  * @param  None

  * @retval None

  */

void TimingDelay_Decrement(void)

{

  if (TimingDelay != 0x00)

  { 

    TimingDelay--;

  }

}

void init_spi(void)

{

    SPI_InitTypeDef  SPI_InitStructure;

    // OLED IC

    SPI_Cmd(SPI1, DISABLE); 

    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);           /* Enable the SPI  */   

    // MAX IC

    SPI_Cmd(SPI2, DISABLE); 

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; // Andysworkshop

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; // From andysworkshop

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; // same

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI2, &SPI_InitStructure);

    SPI_Cmd(SPI2, ENABLE);           /* Enable the SPI */

}

void init_gpio(void) {

 GPIO_InitTypeDef GPIO_InitStruct;

  // Enable SPI clocks

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  // Enable GPIO clocks

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOA, ENABLE);

  // Enable DMA clocks (Is AHB even the right thing???)

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // EMZ TODO get the right ones

  /*Configure GPIO pin : PC */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;

  GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : PB */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_10|GPIO_Pin_12 

                          |GPIO_Pin_9;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;

  GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : PA */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;

  GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : PB */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6 

                          |GPIO_Pin_7;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;

  GPIO_Init(GPIOB, &GPIO_InitStruct);

  /** SPI1 GPIO Configuration  

  PA5   ------> SPI1_SCK

  PA7   ------> SPI1_MOSI

  */

  /*Enable or disable the AHB peripheral clock */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /*Configure GPIO pin : PA: MOSI,SCK */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;

  GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin alternate function */

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);

  /*Configure GPIO pin alternate function */

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

  /** SPI2 GPIO Configuration  

  PB13   ------> SPI2_SCK

  PB14   ------> SPI2_MISO

  PB15   ------> SPI2_MOSI

  */

  /*Enable or disable the AHB peripheral clock */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

// SPI PINSSS

  /*Configure GPIO pin : PB, MOSI, SCK */

  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;

  GPIO_Init(GPIOB, &GPIO_InitStruct);

 GPIO_InitTypeDef GPIO_InitStruct2;

// MISO

  GPIO_InitStruct2.GPIO_Pin = GPIO_Pin_14;

  GPIO_InitStruct2.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStruct2.GPIO_PuPd = GPIO_PuPd_NOPULL;