#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;

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_DrawString("Hello World!", 0, 10);

  //  ssd1306_block_write();

    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);

        }

        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()

{

    // Read MAX temp sensor

    GPIO_ResetBits(MAX_CS);

    // Assert CS

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

    uint8_t retval = 0;//SPI_I2S_ReceiveData(SPI2);

    // Deassert CS

    GPIO_SetBits(MAX_CS);

    if((!retval || (temp & 0x2) != 0))

        return; // Comms error - this is happening right now

    if((temp & 0x4)!= 0)

        return; // Open thermocouple

    temp = (temp & 0x7FF8) >> 5;

    // 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 ]

            // 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         ]

            // Button handler

            if(GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_SETI:

        {

            // Write text to OLED

            // [ therm :: set i ]

            // [ i = 12         ]

            // Button handler

            if(GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_SETD:

        {

            // Write text to OLED

            // [ therm :: set d ]

            // [ d = 12         ]

            // Button handler

            if(GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_PREHEAT_BREW:

        {

            // Write text to OLED

            // [ therm : preheating brew ]

            // [ 30 => 120 C             ]

            // Button handler

            if(GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            if(temp >= setpoint) {

                state = STATE_MAINTAIN_BREW;

            }

        } break;

        case STATE_MAINTAIN_BREW:

        {

            // Write text to OLED

            // [ therm : ready to brew ]

            // [ 30 => 120 C           ]

            // Button handler

            if(GPIO_ReadInputDataBit(SW_BTN)) {

                state = STATE_IDLE;

            }

            // Event Handler

            // N/A

        } break;

        case STATE_PREHEAT_STEAM:

        {

            // Write text to OLED

            // [ therm : preheating steam ]

            // [ 30 => 120 C           ]

            // 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            ]

/*******************************************************************************

* File Name          : ssd1306.c

* Author             : lxyppc

* Version            : V1.0

* Date               : 10-01-21

* Description        : ssd1306 operations

*                      the SSH1101A is compatible with ssd1306

*******************************************************************************/

/* Includes ------------------------------------------------------------------*/

#include "stm32l100c_discovery.h"

#include "bsp.h"

#include "ssd1306.h"

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

#define   SSD1306_PAGE_NUMBER           8

#define   SSD1306_COLUMN_NUMBER         128

#define   SSD1306_COLUMN_MARGIN_START   2

#define   SSD1306_COLUMN_MARGIN_END     2

#define   SSD1306_X_PIXEL   128

#define   SSD1306_Y_PIXEL   32

/* Private macro -------------------------------------------------------------*/

#define   ssd1306_Buffer    (_SSD1306_Buffer + SSD1306_COLUMN_MARGIN_START)

/* Private variables ---------------------------------------------------------*/

static  uint8_t  _SSD1306_Buffer[SSD1306_COLUMN_NUMBER*SSD1306_PAGE_NUMBER + SSD1306_COLUMN_MARGIN_START + SSD1306_COLUMN_MARGIN_END] = {0};

static  uint8_t  pageIndex = 0;

static  uint8_t  iS_SSD_On = 0;

static  uint8_t  pre_on = 0;

static  uint8_t  curContrast = 0xCC;

static  uint8_t  lastContrast = 0xCC;

/* Private function prototypes -----------------------------------------------*/

void  WriteCommand(unsigned char command);

void  WriteData(unsigned char data);

void  OnPageTransferDone(void);

unsigned long ssd1306_OFF(void);

unsigned long ssd1306_ON(void);

unsigned char* ssd1306_GetBuffer()

{

  return ssd1306_Buffer;

}

/*******************************************************************************

* Function Name  : WriteCommand

* Description    : Write command to the ssd1306

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void WriteCommand(unsigned char command)

{

  SSD_A0_Low();

  SPI_SendByte(command);

  SPI_Wait();

}

/*******************************************************************************

* Function Name  : WriteData

* Description    : Write data to the ssd1306

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void WriteData(unsigned char data)

{

  SSD_A0_High();

  SPI_SendByte(data);

  SPI_Wait();

}

/*******************************************************************************

* Function Name  : ssd1306_Init

* Description    : Initialize the ssd1306

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void ssd1306_Init(void)

{

  /* Generate a reset */

  SSD_Reset_Low();

  uint32_t i;

  for(i=5000; i>1; i--) 

  SSD_Reset_High();

  WriteCommand(0xAE);

  WriteCommand(0xD5);

  WriteCommand(0x80);

  WriteCommand(0xA8);

  WriteCommand(0x1F);

  WriteCommand(0xD3);

  WriteCommand(0x00);

  WriteCommand(0x40 | 0x00); // line #0

  WriteCommand(0x8D);

  WriteCommand(0x14); //10 or 14 if not externalvcc

  WriteCommand(0x20);

  WriteCommand(0x00);

  WriteCommand(0xA0 | 0x1); // segremap

  WriteCommand(0xC8); // comscandep

  WriteCommand(0xDA); // setcompins 

  WriteCommand(0x02);

  WriteCommand(0x81); // contrast

  WriteCommand(0x0F); // contrast value. 8f is a good one.

  WriteCommand(0xD9);

  WriteCommand(0xF1); //22 or F1 if not externalvcc

  WriteCommand(0xDB);

  WriteCommand(0x40);

  WriteCommand(0xA4); // dispalyallon_resume

  WriteCommand(0xA6); // normaldisplay

  WriteCommand(0xAF); // display on 

  // Clear buffer

//  for(i=0;i<900;i++)

//    ssd1306_Buffer[i] = 0;

  /*************************************************

  // ssd1306 Initialization Command

  *************************************************/

 /* 

  // Lower Column Address

  WriteCommand(0x00); // Set Lower Column Address 

  GPIO_SetBits(GPIOA,GPIO_Pin_15);//turn on status LED

  // High Column Address

  WriteCommand(0x10); // Set Higher Column Address

  // Display Start Line

  WriteCommand(0x40); // Set Display Start Line 

#ifdef    DEBUG_BOARD

  curContrast = lastContrast = 0x30;

#else

  curContrast = lastContrast = 0xCF;

#endif

  // Contrast Control Register

  WriteCommand(0x81); // Set Contrast Control 

  WriteCommand(lastContrast); // 0 ~ 255 0x1f

  // Re-map

  WriteCommand(0xA1); // [A0]:column address 0 is map to SEG0 , [A1]: columnaddress 131 is map to SEG0 

  // Entire Display ON/OFF

  WriteCommand(0xA4); // A4=ON 

  // Normal or Inverse Display

  WriteCommand(0XA6); // Normal Display

  // Multiplex Ratio

  WriteCommand(0xA8); // Set Multiplex Ratio 

  WriteCommand(0x3f); // Set to 36 Mux

  // Set DC-DC

  WriteCommand(0xAD); // Set DC-DC 

  WriteCommand(0x8B); // 8B=ON, 8A=Off 

  // Display ON/OFF

  WriteCommand(0xAE); // AF=ON , AE=OFF

  // Display Offset

  WriteCommand(0xD3); // Set Display Offset 

  WriteCommand(0x00); // No offset 

  // Display Clock Divide

  WriteCommand(0xD5); // Set Clock Divide 

  WriteCommand(0x20); // Set to 80Hz 

  // Area Color Mode

  WriteCommand(0xD8); // Set Area Color On or Off

  WriteCommand(0x00); // Mono Mode 

  // COM Pins Hardware Configuration

  WriteCommand(0xDA); // Set Pins HardwareConfiguration 

  WriteCommand(0x12);

  // VCOMH

  WriteCommand(0xDB); // Set VCOMH 

  WriteCommand(0x00);

  // VP

  WriteCommand(0xD9); // Set VP 

  WriteCommand(0x22); // P1=2 , P2=2 

  // Set Common output scan direction

  WriteCommand(0xc8);// Set COM scan direction 

  // For SSD1306 Set the address mode

  WriteCommand(0x20);// Set address mode 

  WriteCommand(0x00);// Set address mode horizontal 

  // Set the page start address

  WriteCommand(0xb0);

  WriteCommand(0x00);

  WriteCommand(0x10);

  // Turn on the controller 

  pre_on = ssd1306_ON();

//  // Set Charge pump

//  WriteCommand(0x8D); // Set Charge pump 

//  WriteCommand(0x14); // 0x14=ON, 0x10=Off 

//  

//  // Turn on the display

//  WriteCommand(0xaf);

*/

}

void ssd1306_block_write(void)

{

  // Set col start addr to 0

  WriteCommand(0x21); 

  WriteCommand(0x00); 

#ifndef   ssd1306_H

#define   ssd1306_H

void  ssd1306_Init(void);

void  StartPageTransfer(void);

extern  const DeviceProp  ssd1306_Prop;

unsigned long ssd1306_DrawBlock(Pos_t x, Pos_t y, Pos_t cx, Pos_t cy, const unsigned char* data);

unsigned long ssd1306_IsOn(void);

unsigned long ssd1306_TurnOff(void);

unsigned long ssd1306_TurnOn(void);

unsigned char ssd1306_SetContrast(unsigned char contrast);

unsigned char ssd1306_GetContrast();

unsigned char* ssd1306_GetBuffer();

unsigned long ssd1306_DrawPoint(Pos_t x, Pos_t y, Color_t color);

void ssd1306_block_write(void);

void ssd1306_DrawChar(char ascii, unsigned char row, unsigned char xPos);

void ssd1306_DrawString(const char *dataPtr, unsigned char row, unsigned char xPos);

#endif