/**

  ******************************************************************************

  * @file    hw_config.c

  * @author  MCD Application Team

  * @version V4.0.0

  * @date    21-January-2013

  * @brief   Hardware Configuration & Setup

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>

  *

  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");

  * You may not use this file except in compliance with the License.

  * You may obtain a copy of the License at:

  *

  *        http://www.st.com/software_license_agreement_liberty_v2

  *

  * Unless required by applicable law or agreed to in writing, software 

  * distributed under the License is distributed on an "AS IS" BASIS, 

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  *

  ******************************************************************************

  */

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

#include "stm32_it.h"

#include "usb_lib.h"

#include "usb_prop.h"

#include "usb_desc.h"

#include "hw_config.h"

#include "usb_pwr.h"

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

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

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

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

ErrorStatus HSEStartUpStatus;

EXTI_InitTypeDef EXTI_InitStructure;

extern __IO uint32_t packet_sent;

extern __IO uint8_t Send_Buffer[VIRTUAL_COM_PORT_DATA_SIZE] ;

extern __IO  uint32_t packet_receive;

extern __IO uint8_t Receive_length;

uint8_t Receive_Buffer[64];

uint32_t Send_length;

static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);

/* Extern variables ----------------------------------------------------------*/

extern LINE_CODING linecoding;

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

/* Private functions ---------------------------------------------------------*/

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

* Function Name  : Set_System

* Description    : Configures Main system clocks & power

* Input          : None.

* Return         : None.

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

void Set_System(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

#if defined(USB_USE_EXTERNAL_PULLUP)

  GPIO_InitTypeDef  GPIO_InitStructure;

#endif /* USB_USE_EXTERNAL_PULLUP */ 

  /*!< At this stage the microcontroller clock setting is already configured, 

       this is done through SystemInit() function which is called from startup

       file (startup_stm32f10x_xx.s) before to branch to application main.

       To reconfigure the default setting of SystemInit() function, refer to

       system_stm32f10x.c file

     */   

  /* Enable the SYSCFG module clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  /* Enable USB_DISCONNECT GPIO clock */

  /* Configure USB pull-up pin */

#if defined(USB_USE_EXTERNAL_PULLUP)

  /* Enable the USB disconnect GPIO clock */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIO_DISCONNECT, ENABLE);

  /* USB_DISCONNECT used as USB pull-up */

  GPIO_InitStructure.GPIO_Pin = USB_DISCONNECT_PIN;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_Init(USB_DISCONNECT, &GPIO_InitStructure);  

#endif /* USB_USE_EXTERNAL_PULLUP */ 

   /* Configure the EXTI line 18 connected internally to the USB IP */

  EXTI_ClearITPendingBit(EXTI_Line18);

  EXTI_InitStructure.EXTI_Line = EXTI_Line18;

  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

  EXTI_InitStructure.EXTI_LineCmd = ENABLE;

  EXTI_Init(&EXTI_InitStructure); 

}

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

* Function Name  : Set_USBClock

* Description    : Configures USB Clock input (48MHz)

* Input          : None.

* Return         : None.

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

void Set_USBClock(void)

{

  /* Enable USB clock */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);

}

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

* Function Name  : Enter_LowPowerMode

* Description    : Power-off system clocks and power while entering suspend mode

* Input          : None.

* Return         : None.

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

void Enter_LowPowerMode(void)

{

  /* Set the device state to suspend */

  bDeviceState = SUSPENDED;

}

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

* Function Name  : Leave_LowPowerMode

* Description    : Restores system clocks and power while exiting suspend mode

* Input          : None.

* Return         : None.

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

void Leave_LowPowerMode(void)

{

  DEVICE_INFO *pInfo = &Device_Info;

  /* Set the device state to the correct state */

  if (pInfo->Current_Configuration != 0)

  {

    /* Device configured */

    bDeviceState = CONFIGURED;

  }

  else

  {

    bDeviceState = ATTACHED;

  }

    /*Enable SystemCoreClock*/

  SystemInit();

}

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

* Function Name  : USB_Interrupts_Config

* Description    : Configures the USB interrupts

* Input          : None.

* Return         : None.

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

void USB_Interrupts_Config(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

  /* 2 bit for pre-emption priority, 2 bits for subpriority */

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  /* Enable the USB interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

  /* Enable the USB Wake-up interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = USB_FS_WKUP_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

}

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

* Function Name  : USB_Cable_Config

* Description    : Software Connection/Disconnection of USB Cable

* Input          : None.

* Return         : Status

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

void USB_Cable_Config (FunctionalState NewState)

{

  if (NewState != DISABLE)

  {

    STM32L15_USB_CONNECT;

  }

  else

  {

    STM32L15_USB_DISCONNECT;

  }  

}

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

* Function Name  : Get_SerialNum.

* Description    : Create the serial number string descriptor.

* Input          : None.

* Output         : None.

* Return         : None.

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

void Get_SerialNum(void)

{

  uint32_t Device_Serial0, Device_Serial1, Device_Serial2;

  Device_Serial0 = *(uint32_t*)ID1;

  Device_Serial1 = *(uint32_t*)ID2;

  Device_Serial2 = *(uint32_t*)ID3;

  Device_Serial0 += Device_Serial2;

  if (Device_Serial0 != 0)

  {

    IntToUnicode (Device_Serial0, &Virtual_Com_Port_StringSerial[2] , 8);

    IntToUnicode (Device_Serial1, &Virtual_Com_Port_StringSerial[18], 4);

  }

}

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

* Function Name  : HexToChar.

* Description    : Convert Hex 32Bits value into char.

* Input          : None.

* Output         : None.

* Return         : None.

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

static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)

{

  uint8_t idx = 0;

  for( idx = 0 ; idx < len ; idx ++)

  {

    if( ((value >> 28)) < 0xA )

    {

      pbuf[ 2* idx] = (value >> 28) + '0';

    }

    else

    {

      pbuf[2* idx] = (value >> 28) + 'A' - 10; 

    }

    value = value << 4;

    pbuf[ 2* idx + 1] = 0;

  }

}

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

* Function Name  : Send DATA .

* Description    : send the data received from the STM32 to the PC through USB  

* Input          : None.

* Output         : None.

* Return         : None.

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

uint32_t CDC_Send_DATA (uint8_t *ptrBuffer, uint8_t Send_length)

{

  /*if max buffer is Not reached*/

  if(Send_length < VIRTUAL_COM_PORT_DATA_SIZE)     

  {

    /*Sent flag*/

    packet_sent = 0;

    /* send  packet to PMA*/

    UserToPMABufferCopy((unsigned char*)ptrBuffer, ENDP1_TXADDR, Send_length);

    SetEPTxCount(ENDP1, Send_length);

    SetEPTxValid(ENDP1);

  }

  else

  {

    return 0;

  } 

  return 1;

}

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

* Function Name  : Receive DATA .

* Description    : receive the data from the PC to STM32 and send it through USB

* Input          : None.

* Output         : None.

* Return         : None.

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

uint32_t CDC_Receive_DATA(void)

{ 

  /*Receive flag*/

  packet_receive = 0;

  SetEPRxValid(ENDP3); 

  return 1 ;

}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

#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

/* Extern variables ----------------------------------------------------------*/

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;

void init_gpio();

void init_spi();

void process();

void machine();

int main(void)

{

    // Init clocks

    SystemInit();

    init_gpio();

    Set_USBClock();

    USB_Interrupts_Config();

    GPIO_SetBits(LED_POWER);

    USB_Init(); // freezes here... maybe clock issue?

    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_DrawPoint(3,3,1);

    ssd1306_DrawPoint(5,5,0);

    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);

//        SPI_I2S_SendData(SPI2,0xFA);

//        SPI_I2S_SendData(SPI1,0xFA);

        if(!GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_3)) {

            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;

            }