/**
  ******************************************************************************
  * @file    stm3210c_eval_ioe.c
  * @author  MCD Application Team
  * @version V4.5.0
  * @date    07-March-2011
  * @brief   This file includes the IO Expander driver for STMPE811 IO Expander 
  *          devices.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************  
  */ 

  /* File Info : ---------------------------------------------------------------
  
    Note:
    -----
    - This driver uses the DMA method for sending and receiving data on I2C bus
      which allow higher efficiency and reliability of the communication.  
  
    SUPPORTED FEATURES:
      - IO Read/write : Set/Reset and Read (Polling/Interrupt)
      - Joystick: config and Read (Polling/Interrupt)
      - Touch Screen Features: Single point mode (Polling/Interrupt)
      - TempSensor Feature: accuracy not determined (Polling).

    UNSUPPORTED FEATURES:
      - Row ADC Feature is not supported (not implemented on STM3210C-EVAL board)
  ----------------------------------------------------------------------------*/

/* Includes ------------------------------------------------------------------*/
#include "stm3210c_eval_ioe.h"

/** @addtogroup Utilities
  * @{
  */

/** @addtogroup STM32_EVAL
  * @{
  */ 

/** @addtogroup STM3210C_EVAL
  * @{
  */
    
/** @defgroup STM3210C_EVAL_IOE 
  * @brief  This file includes the IO Expander driver for STMPE811 IO Expander 
  *         devices.
  * @{
  */   

/** @defgroup STM3210C_EVAL_IOE_Private_TypesDefinitions
  * @{
  */ 
/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_IOE_Private_Defines
  * @{
  */ 
#define TIMEOUT_MAX             0x1000   /*<! The value of the maximal timeout for I2C waiting loops */

#define TS_CONVERSION_DELAY     0x10000  /*<! The application should wait before ADC end of conversion. 
                                              This delay depends on the system clock frequency, the value 0x10000
                                              is selected for system clock equal to 72 MHz. For lower frequencies
                                              please modify the delay accordingly. */
/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_IOE_Private_Macros
  * @{
  */ 
/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_IOE_Private_Variables
  * @{
  */ 
TS_STATE TS_State;              /*<! The global structure holding the TS state */

uint32_t IOE_TimeOut = TIMEOUT_MAX; /*<! Value of Timeout when I2C communication fails */

/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_IOE_Private_FunctionPrototypes
  * @{
  */ 
static uint16_t IOE_TS_Read_X(void);
static uint16_t IOE_TS_Read_Y(void);
static uint16_t IOE_TS_Read_Z(void);

static void IOE_GPIO_Config(void);
static void IOE_I2C_Config(void);
static void IOE_DMA_Config(IOE_DMADirection_TypeDef Direction, uint8_t* buffer);
static void IOE_EXTI_Config(void);

#ifndef USE_Delay
static void delay(__IO uint32_t nCount);
#endif /* USE_Delay*/
/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_IOE_Private_Functions
  * @{
  */ 


/**
  * @brief  Initializes and Configures the two IO_Expanders Functionalities 
  *         (IOs, Touch Screen ..) and configures all STM3210C-EVAL necessary
  *         hardware (GPIOs, APB clocks ..).
  * @param  None
  * @retval IOE_OK if all initializations done correctly. Other value if error.
  */
uint8_t IOE_Config(void)
{
  /* Configure the needed pins */
  IOE_GPIO_Config(); 
  
  /* Configure the I2C peripheral */
  IOE_I2C_Config();
  
  /* Read IO Expander 1 ID  */
  if(IOE_IsOperational(IOE_1_ADDR))
  {
    return IOE1_NOT_OPERATIONAL;
  }
  if(IOE_IsOperational(IOE_2_ADDR))
  {
    return IOE2_NOT_OPERATIONAL;
  }
  
  /* Generate IOExpander Software reset */
  IOE_Reset(IOE_1_ADDR); 
  IOE_Reset(IOE_2_ADDR);
  
  /* ---------------------- IO Expander 1 configuration --------------------- */
  /* Enable the GPIO, Touch Screen and ADC functionalities */
  IOE_FnctCmd(IOE_1_ADDR, IOE_IO_FCT | IOE_TS_FCT | IOE_ADC_FCT, ENABLE);
  /* Configure the VBAT pin in output mode pin*/
  IOE_IOPinConfig(IOE_1_ADDR, VBAT_DIV_PIN , Direction_OUT);  
  /* ENABLE the alternate function for IN1 pin */
  IOE_IOAFConfig(IOE_1_ADDR, VBAT_DIV_PIN, ENABLE);
  
  /* Apply the default state for the out pins */
  IOE_WriteIOPin(VBAT_DIV_PIN, BitReset);
  /* Configure the MEMS interrupt pins in Input mode */
  IOE_IOPinConfig(IOE_2_ADDR, (uint32_t)(MEMS_INT1_PIN | MEMS_INT2_PIN), Direction_IN); 
  
  /* ENABLE the alternate function for the Joystick pins */
  IOE_IOAFConfig(IOE_2_ADDR, (uint32_t)(MEMS_INT1_PIN | MEMS_INT2_PIN), ENABLE);
  /* Configure the IOs to detect Falling and Rising Edges */
  IOE_IOEdgeConfig(IOE_2_ADDR, (uint32_t)(MEMS_INT1_PIN | MEMS_INT2_PIN), (uint32_t)(EDGE_FALLING | EDGE_RISING));
  /* Touch Screen controller configuration */
  IOE_TS_Config();
  
  /* ------------------------------------------------------------------------ */
  
  /* ---------------------- IO Expander 2 configuration --------------------- */
  /* Enable the GPIO, Temperature Sensor and ADC functionalities */
  IOE_FnctCmd(IOE_2_ADDR, IOE_IO_FCT | IOE_TEMPSENS_FCT | IOE_ADC_FCT, ENABLE);
  
  /* Configure the Audio Codec Reset pin in output mode pin*/
  IOE_IOPinConfig(IOE_2_ADDR, (uint32_t)(AUDIO_RESET_PIN), Direction_OUT);
  IOE_IOPinConfig(IOE_2_ADDR, (uint32_t)(MII_INT_PIN), Direction_IN);
      
  /* ENABLE the alternate function for IN1 pin */
  IOE_IOAFConfig(IOE_2_ADDR, (uint32_t)(AUDIO_RESET_PIN | MII_INT_PIN), ENABLE);
    
  /* Apply the default state for the out pins */
  IOE_WriteIOPin(AUDIO_RESET_PIN, BitReset);
  IOE_WriteIOPin(MII_INT_PIN, BitReset);
  /* Configure the Joystick pins in Input mode */
  IOE_IOPinConfig(IOE_2_ADDR, JOY_IO_PINS , Direction_IN); 
  
  /* ENABLE the alternate function for the Joystick pins */
  IOE_IOAFConfig(IOE_2_ADDR, JOY_IO_PINS, ENABLE);
  /* Configure the IOs to detect Falling and Rising Edges */
  IOE_IOEdgeConfig(IOE_2_ADDR, JOY_IO_PINS, (uint8_t)(EDGE_FALLING | EDGE_RISING));
  
  /* Temperature Sensor module configuration */
  IOE_TempSens_Config();
  /* ------------------------------------------------------------------------ */
  
  /* Configuration is OK */
  return IOE_OK; 
}

/**
  * @brief  Configures The selected interrupts on the IO Expanders.
  * @param  IOE_ITSRC_Source: the source of the interrupts. Could be one or a 
  *         combination of the following parameters:
  *   @arg  IOE_ITSRC_JOYSTICK: Joystick IO intputs.
  *   @arg  IOE_ITSRC_TSC: Touch Screen interrupts.
  *   @arg  IOE_ITSRC_INMEMS: MEMS interrupt lines.
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_ITConfig(uint32_t IOE_ITSRC_Source)
{   
  /* Configure the Interrupt output pin to generate low level (INT_CTRL) */
  IOE_ITOutConfig(Polarity_High, Type_Level);  
  
  /* Manage the Joystick Interrupts */  
  if (IOE_ITSRC_Source & IOE_ITSRC_JOYSTICK)
  {   
    /* Enable the Global interrupt */  
    IOE_GITCmd(IOE_2_ADDR, ENABLE);     
        
    /* Enable the Joystick pins to generate interrupt (GPIO_INT_EN) */
    IOE_IOITConfig(IOE_2_ADDR, IOE_JOY_IT, ENABLE);   
    
    /* Enable the Global GPIO Interrupt */
    IOE_GITConfig(IOE_2_ADDR, IOE_GIT_GPIO, ENABLE);    
    
    /* Read the GPIO_IT_STA to clear all pending bits if any */
    I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_INT_STA);    
    
    /* Enable the Joystick pins to generate interrupt */
    IOE_IOITConfig(IOE_2_ADDR, IOE_JOY_IT, ENABLE);  
    
    /* Read the GPIO_IT_STA to clear all pending bits if any */
    I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_INT_STA);     
  }

  /* Manage the MEMS Interrupts lines  */  
  if (IOE_ITSRC_Source & IOE_ITSRC_INMEMS)
  {   
    /* Enable the Global interrupt */  
    IOE_GITCmd(IOE_1_ADDR, ENABLE);     
        
    /* Enable the pins to generate interrupt (GPIO_INT_EN) */
    IOE_IOITConfig(IOE_1_ADDR, IOE_INMEMS_IT, ENABLE);   
    
    /* Enable the Global GPIO Interrupt */
    IOE_GITConfig(IOE_1_ADDR, IOE_GIT_GPIO, ENABLE);    
    
    /* Read the GPIO_IT_STA to clear all pending bits if any */
    I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_INT_STA);    
    
    /* Enable the pins to generate interrupt */
    IOE_IOITConfig(IOE_1_ADDR, IOE_INMEMS_IT, ENABLE);  
    
    /* Read the GPIO_IT_STA to clear all pending bits if any */
    I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_INT_STA);     
  }  
  
  /* Manage the Touch Screen Interrupts */  
  if (IOE_ITSRC_Source & IOE_ITSRC_TSC)
  {   
    /* Enable the Global interrupt */  
    IOE_GITCmd(IOE_1_ADDR, ENABLE);     
           
    /* Enable the Global GPIO Interrupt */
    IOE_GITConfig(IOE_1_ADDR, (uint8_t)(IOE_GIT_TOUCH | IOE_GIT_FTH | IOE_GIT_FOV), ENABLE);    
    
    /* Read the GPIO_IT_STA to clear all pending bits if any */
    I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_INT_STA); 
  }
  
  /* Configure the Interrupt line as EXTI source */
  IOE_EXTI_Config();    
  
  /* If all OK return IOE_OK */
  return IOE_OK;
}

/**
  * @brief  Writes a bit value to an output IO pin.
  * @param IO_Pin: The output pin to be set or reset. This parameter can be one 
  *        of the following values:
  *   @arg  AUDIO_RESET_PIN: Audio codec reset pin
  *   @arg  MII_INT_PIN: Ethernet Phy MII interrupt pin
  *   @arg  VBAT_DIV_PIN: Battery devider pin
  * @param BitVal: The value to be set. This parameter can be one of the
  *        following values: BitSet or BitReset. See IOE_BitVal_TypeDef.
  * @retval IOE_OK or PARAM_ERROR
  */
uint8_t IOE_WriteIOPin(uint8_t IO_Pin, IOE_BitValue_TypeDef BitVal)
{
  uint8_t DeviceAddr = 0;
  
  /* Get the IO expander Address according to which pin is to be controlled */
  if (IO_Pin & IO1_OUT_ALL_PINS)
  {
    DeviceAddr = IOE_1_ADDR;
  }
  else if (IO_Pin & IO2_OUT_ALL_PINS)
  {
    DeviceAddr = IOE_2_ADDR;
  }
  else
  {
    return PARAM_ERROR;
  }
  
  /* Apply the bit value to the selected pin */
  if (BitVal == BitReset)
  {
    /* Set the register */
    I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_CLR_PIN, IO_Pin);
  }
  else
  {
    /* Set the register */
    I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_SET_PIN, IO_Pin);
  }
  
  return IOE_OK;
}


/**
  * @brief  Returns the status of the selected input IO pin.
  * @param IO_Pin: The input pin to be read. This parameter can be one 
  *  of the following values:
  *   @arg  MEMS_INT1_PIN: MEMS interrupt line 1.
  *   @arg  MEMS_INT2_PIN: MEMS interrupt line 2.
  *   @arg  JOY_IO_PINS: Joystick IO pins (use IOE_JoyStickGetState for these pins)  
  * @retval None
  */
uint8_t IOE_ReadIOPin(uint32_t IO_Pin)
{
  uint8_t DeviceAddr = 0;
  uint8_t tmp = 0;  
  if (IO_Pin & IO1_IN_ALL_PINS)
  {
    DeviceAddr = IOE_1_ADDR;
  }
  else if (IO_Pin & IO2_IN_ALL_PINS)
  {
    DeviceAddr = IOE_2_ADDR;
  }
  else 
  {
    return PARAM_ERROR;
  }
  
  /* Get all the Pins status */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_MP_STA);
  if ((tmp & (uint8_t)IO_Pin) != 0)
  {
    return BitSet;
  }  
  else 
  {
    return BitReset;
  }
}


/**
  * @brief  Returns the current Joystick status.
  * @param  None
  * @retval The code of the Joystick key pressed: 
  *   @arg  JOY_NONE
  *   @arg  JOY_SEL
  *   @arg  JOY_DOWN
  *   @arg  JOY_LEFT
  *   @arg  JOY_RIGHT
  *   @arg  JOY_UP
  */
JOYState_TypeDef
 IOE_JoyStickGetState(void)
{
  uint8_t tmp = 0;
  /* Read the status of all pins */
  tmp = (uint32_t)I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_MP_STA);
   
  /* Check the pressed keys */
  if ((tmp & JOY_IO_NONE) == JOY_IO_NONE)
  {
    return (JOYState_TypeDef) JOY_NONE;
  }
  else if (!(tmp & JOY_IO_SEL))
  {
    return (JOYState_TypeDef) JOY_SEL;
  }
  else if (!(tmp & JOY_IO_DOWN))
  {
    return (JOYState_TypeDef) JOY_DOWN;
  }
  else if (!(tmp & JOY_IO_LEFT))
  {
    return (JOYState_TypeDef) JOY_LEFT;
  }
  else if (!(tmp & JOY_IO_RIGHT))
  {
    return (JOYState_TypeDef) JOY_RIGHT;
  }
  else if (!(tmp & JOY_IO_UP))
  {
    return (JOYState_TypeDef) JOY_UP;
  }
  else
  { 
    return (JOYState_TypeDef) JOY_NONE;
  }
}

/**
  * @brief  Returns Status and positions of the Touch screen.
  * @param  None
  * @retval Pointer to TS_STATE structure holding Touch Screen information.
  */
TS_STATE* IOE_TS_GetState(void)
{
  uint32_t xDiff, yDiff , x , y, count;
  static uint32_t _x = 0, _y = 0;
  
  /* Check if the Touch detect event happenned */
  TS_State.TouchDetected = (I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CTRL) & 0x80);

  /* Wait till end of ADC conversion */
  for (count = TS_CONVERSION_DELAY; count > 0; count--);

  if(TS_State.TouchDetected) 
  {
    x = IOE_TS_Read_X();
    y = IOE_TS_Read_Y();
    xDiff = x > _x? (x - _x): (_x - x);
    yDiff = y > _y? (y - _y): (_y - y);       
    if (xDiff + yDiff > 5)
    {
      _x = x;
      _y = y;       
    }
  }  
  /* Update the X position */
  TS_State.X = _x;
    
  /* Update the Y position */  
  TS_State.Y = _y;

  /* Update the Z Pression index */  
  TS_State.Z = IOE_TS_Read_Z();  
  
  /* Clear the interrupt pending bit and enable the FIFO again */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x01);
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x00);
  
  /* Return pointer to the updated structure */
  return &TS_State; 
}

/**
  * @brief  Returns the temperature row value (in 16 bit format).
  * @param  None
  * @retval The temperature row value.
  */
uint32_t IOE_TempSens_GetData(void)
{  
  static __IO uint32_t tmp = 0;  
    
  /* Aquire data enable */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x03);
  
  /* Enable the TEMPSENS module */
  tmp = (uint32_t)((I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_DATA) & 0x03) << 8); 
  tmp |= (uint32_t)I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_DATA + 1); 
  
  tmp = (uint32_t)((33 * tmp * 100) / 751);
  tmp = (uint32_t)((tmp + 5) / 10);
  
  /* return the temprature row value */
  return tmp;
}

/**
  * @brief  Checks the selected Global interrupt source pending bit
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  Global_IT: the Global interrupt source to be checked, could be:
  *   @arg  Global_IT_GPIO : All IOs interrupt
  *   @arg  Global_IT_ADC : ADC interrupt
  *   @arg  Global_IT_TEMP : Temperature Sensor interrupts      
  *   @arg  Global_IT_FE : Touch Screen Controller FIFO Error interrupt
  *   @arg  Global_IT_FF : Touch Screen Controller FIFO Full interrupt      
  *   @arg  Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt     
  *   @arg  Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt   
  *   @arg  Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt      
  * @retval Status of the checked flag. Could be SET or RESET.
  */
FlagStatus IOE_GetGITStatus(uint8_t DeviceAddr, uint8_t Global_IT)
{
  __IO uint8_t tmp = 0;
 
  /* get the Interrupt status */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_STA);
    
  if ((tmp & (uint8_t)Global_IT) != 0)
  {
    return SET;
  }
  else
  {
    return RESET;
  }
}

/**
  * @brief  Clears the selected Global interrupt pending bit(s)
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  Global_IT: the Global interrupt to be cleared, could be any combination
  *         of the following values:   
  *   @arg  Global_IT_GPIO : All IOs interrupt
  *   @arg  Global_IT_ADC : ADC interrupt
  *   @arg  Global_IT_TEMP : Temperature Sensor interrupts      
  *   @arg  Global_IT_FE : Touch Screen Controller FIFO Error interrupt
  *   @arg  Global_IT_FF : Touch Screen Controller FIFO Full interrupt      
  *   @arg  Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt     
  *   @arg  Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt   
  *   @arg  Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt 
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_ClearGITPending(uint8_t DeviceAddr, uint8_t Global_IT)
{
  /* Write 1 to the bits that have to be cleared */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_STA, Global_IT); 

  /* If all OK return IOE_OK */
  return IOE_OK;
}

/**
  * @brief  Checks the status of the selected IO interrupt pending bit
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_IT: the IO interrupt to be checked could be IO_ITx Where x can be 
  *         from 0 to 7.             
  * @retval Status of the checked flag. Could be SET or RESET.
  */
FlagStatus IOE_GetIOITStatus(uint8_t DeviceAddr, uint8_t IO_IT)
{
  uint8_t tmp = 0;
 
  /* get the Interrupt status */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_STA);
  
  if ((tmp & (uint8_t)IO_IT) != 0)
  {
    return SET;
  }
  else
  {
    return RESET;
  }
}

/**
  * @brief  Clears the selected IO interrupt pending bit(s).
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_IT: the IO interrupt to be checked could be IO_ITx Where x can be 
  *         from 0 to 7.              
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_ClearIOITPending(uint8_t DeviceAddr, uint8_t IO_IT)
{
  /* Write 1 to the bits that have to be cleared */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_STA, IO_IT);  

  /* Clear the Edge detection pending bit*/
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_ED, IO_IT);

  /* Clear the Rising edge pending bit */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_RE, IO_IT);

  /* Clear the Falling edge pending bit */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_FE, IO_IT);  

  /* If all OK return IOE_OK */
  return IOE_OK;
}

/**
  * @brief  Checks if the selected device is correctly configured and 
  *         communicates correctly ont the I2C bus.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @retval IOE_OK if IOE is operational. Other value if failure.
  */
uint8_t IOE_IsOperational(uint8_t DeviceAddr)
{
  /* Return Error if the ID is not correct */
  if( IOE_ReadID(DeviceAddr) != (uint16_t)STMPE811_ID )
  {
    /* Check if a Timeout occured */
    if (IOE_TimeOut == 0)
    {
      return (IOE_TimeoutUserCallback());
    }
    else
    {
      return IOE_FAILURE; /* ID is not Correct */
    }
  } 
  else 
  {
    return IOE_OK; /* ID is correct */
  }
}

/**
  * @brief  Resets the IO Expander by Software (SYS_CTRL1, RESET bit).
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_Reset(uint8_t DeviceAddr)
{
  /* Power Down the IO_Expander */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL1, 0x02);

  /* wait for a delay to insure registers erasing */
  _delay_(2); 
  
  /* Power On the Codec after the power off => all registers are reinitialized*/
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL1, 0x00);
  
  /* If all OK return IOE_OK */
  return IOE_OK;    
}

/**
  * @brief  Reads the selected device's ID.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @retval The Device ID (two bytes).
  */
uint16_t IOE_ReadID(uint8_t DeviceAddr)
{
  uint16_t tmp = 0;

  /* Read device ID  */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, 0);
  tmp = (uint32_t)(tmp << 8);
  tmp |= (uint32_t)I2C_ReadDeviceRegister(DeviceAddr, 1);
  
  /* Return the ID */
  return (uint16_t)tmp;
}

/**
  * @brief  Configures the selcted IO Expander functionalities.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IOE_TEMPSENS_FCT: the functions to be configured. could be any 
  *         combination of the following values:
  *   @arg  IOE_IO_FCT : IO function
  *   @arg  IOE_TS_FCT : Touch Screen function
  *   @arg  IOE_ADC_FCT : ADC function
  *   @arg  IOE_TEMPSENS_FCT : Tempreature Sensor function
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_FnctCmd(uint8_t DeviceAddr, uint8_t Fct, FunctionalState NewState)
{
  uint8_t tmp = 0;
  
  /* Get the register value */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL2);
  
  if (NewState != DISABLE)
  {
    /* Set the Functionalities to be Enabled */    
    tmp &= ~(uint8_t)Fct;
  }
  else
  {
    /* Set the Functionalities to be Disabled */    
    tmp |= (uint8_t)Fct;  
  }
  
  /* Set the register value */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL2, tmp);
  
  /* If all OK return IOE_OK */
  return IOE_OK;    
}

/**
  * @brief  Configures the selected pin direction (to be an input or an output)
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_Pin: IO_Pin_x: Where x can be from 0 to 7.   
  * @param  Direction: could be Direction_IN or Direction_OUT.      
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_IOPinConfig(uint8_t DeviceAddr, uint8_t IO_Pin, uint8_t Direction)
{
  uint8_t tmp = 0;   
  
  /* Get all the Pins direction */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_DIR);
  
  if (Direction != Direction_IN)
  {
    tmp |= (uint8_t)IO_Pin;
  }  
  else 
  {
    tmp &= ~(uint8_t)IO_Pin;
  }
  
  /* Write the register new value */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_DIR, tmp);
  
  /* If all OK return IOE_OK */
  return IOE_OK;      
}

/**
  * @brief  Enables or disables the Global interrupt.
  * @param  DeviceAddr: The address of the IOExpander, could be :I OE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  NewState: could be ENABLE or DISABLE.        
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_GITCmd(uint8_t DeviceAddr, FunctionalState NewState)
{
  uint8_t tmp = 0;
  
  /* Read the Interrupt Control register  */
  I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_CTRL);
  
  if (NewState != DISABLE)
  {
    /* Set the global interrupts to be Enabled */    
    tmp |= (uint8_t)IOE_GIT_EN;
  }
  else
  {
    /* Set the global interrupts to be Disabled */    
    tmp &= ~(uint8_t)IOE_GIT_EN;
  }  
  
  /* Write Back the Interrupt Control register */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_CTRL, tmp);

  /* If all OK return IOE_OK */
  return IOE_OK;     
}

/**
  * @brief  Configures the selected source to generate or not a global interrupt
  * @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *        or IOE_2_ADDR.
  * @param Global_IT: the interrupt source to be configured, could be:
  *   @arg  Global_IT_GPIO : All IOs interrupt
  *   @arg  Global_IT_ADC : ADC interrupt
  *   @arg  Global_IT_TEMP : Temperature Sensor interrupts      
  *   @arg  Global_IT_FE : Touch Screen Controller FIFO Error interrupt
  *   @arg  Global_IT_FF : Touch Screen Controller FIFO Full interrupt      
  *   @arg  Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt     
  *   @arg  Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt   
  *   @arg  Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt 
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_GITConfig(uint8_t DeviceAddr, uint8_t Global_IT, FunctionalState NewState)
{
  uint8_t tmp = 0;
  
  /* Get the current value of the INT_EN register */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_EN);
  
  if (NewState != DISABLE)
  {
    /* Set the interrupts to be Enabled */    
    tmp |= (uint8_t)Global_IT;  
  }
  else
  {
    /* Set the interrupts to be Disabled */    
    tmp &= ~(uint8_t)Global_IT;
  }
  /* Set the register */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_EN, tmp);
  
  /* If all OK return IOE_OK */
  return IOE_OK;  
}

/**
  * @brief  Configures the selected pins to generate an interrupt or not.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_IT: The IO interrupt to be configured. This parameter could be any
  *         combination of the following values:
  *   @arg  IO_IT_x: where x can be from 0 to 7.
  * @param  NewState: could be ENABLE or DISABLE.  
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_IOITConfig(uint8_t DeviceAddr, uint8_t IO_IT, FunctionalState NewState)
{
  uint8_t tmp = 0;
 
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_EN);
  
  if (NewState != DISABLE)
  {
    /* Set the interrupts to be Enabled */    
    tmp |= (uint8_t)IO_IT;
  }
  else
  {
    /* Set the interrupts to be Disabled */    
    tmp &= ~(uint8_t)IO_IT;
  }
  
  /* Set the register */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_EN, tmp);
  
  /* If all OK return IOE_OK */
  return IOE_OK;   
}

/**
  * @brief  Configures the touch Screen Controller (Single point detection)
  * @param  None
  * @retval IOE_OK if all initializations are OK. Other value if error.
  */
uint8_t IOE_TS_Config(void)
{
  uint8_t tmp = 0;  
  
  /* Enable TSC Fct: already done in IOE_Config */
  tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_SYS_CTRL2);
  tmp &= ~(uint32_t)(IOE_TS_FCT | IOE_ADC_FCT);
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_SYS_CTRL2, tmp); 
  
  /* Enable the TSC gloabl interrupts */
  tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_INT_EN);
  tmp |= (uint32_t)(IOE_GIT_TOUCH | IOE_GIT_FTH | IOE_GIT_FOV);
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_EN, tmp); 
  
  /* Select Sample Time, bit number and ADC Reference */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_ADC_CTRL1, 0x49);
  
  /* Wait for ~20 ms */
  _delay_(2);  
  
  /* Select the ADC clock speed: 3.25 MHz */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_ADC_CTRL2, 0x01);
  
  /* Select TSC pins in non default mode */  
  tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_AF);
  tmp &= ~(uint8_t)TOUCH_IO_ALL;
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_AF, tmp); 
  
  /* Select 2 nF filter capacitor */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CFG, 0x9A);   
  
  /* Select single point reading  */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_TH, 0x01);
  
  /* Write 0x01 to clear the FIFO memory content. */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x01);
  
  /* Write 0x00 to put the FIFO back into operation mode  */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x00);
  
  /* set the data format for Z value: 7 fractional part and 1 whole part */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_FRACT_XYZ, 0x01);
  
  /* set the driving capability of the device for TSC pins: 50mA */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_I_DRIVE, 0x01);
  
  /* Use no tracking index, touchscreen controller operation mode (XYZ) and 
     enable the TSC */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CTRL, 0x01);
  
  /*  Clear all the status pending bits */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_STA, 0xFF); 
  
  /* Initialize the TS structure to their default values */ 
  TS_State.TouchDetected = TS_State.X = TS_State.Y = TS_State.Z = 0;
  
  /* All configuration done */
  return IOE_OK;  
}

/**
  * @brief  Configures and enables the Temperature sensor module.
  * @param  None
  * @retval IOE_OK if all initializations are OK. Other value if error.
  */
uint8_t IOE_TempSens_Config(void)
{
  __IO uint8_t tmp = 0;
  
  /* Enable Temperature Sensor Fct: already done in IOE_Config */
  tmp = I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_SYS_CTRL2);
  tmp &= ~(uint32_t)(IOE_TEMPSENS_FCT | IOE_ADC_FCT);
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_SYS_CTRL2, tmp);  
  
  /* Enable the TEMPSENS module */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x01);
  
  /* Aquire data enable */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x3);
  
  /* All configuration done */
  return IOE_OK;
}

/**
  * @brief  Configures the selected pin to be in Alternate function or not
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_Pin: IO_Pin_x, Where x can be from 0 to 7.   
  * @param  NewState: State of the AF for the selected pin, could be 
  *         ENABLE or DISABLE.       
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_IOAFConfig(uint8_t DeviceAddr, uint8_t IO_Pin, FunctionalState NewState)
{
  uint8_t tmp = 0;
  
  /* Get the current state of the GPIO_AF register */
  tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_AF);
  
  if (NewState != DISABLE)
  {
    /* Enable the selected pins alternate function */
    tmp |= (uint8_t)IO_Pin;
  }
  else
  {
    /* Disable the selected pins alternate function */   
    tmp &= ~(uint8_t)IO_Pin;   
  }
  
  /* Write back the new valu in GPIO_AF register */  
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_AF, tmp);  

  /* If all OK return IOE_OK */
  return IOE_OK;
}

/**
  * @brief  Configures the Edge for which a transition is detectable for the
  *         the selected pin.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR.
  * @param  IO_Pin: IO_Pin_x, Where x can be from 0 to 7.   
  * @param  Edge: The edge which will be detected. This parameter can be one or a
  *         a combination of follwing values: EDGE_FALLING and EDGE_RISING .
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_IOEdgeConfig(uint8_t DeviceAddr, uint8_t IO_Pin, uint8_t Edge)
{
  uint8_t tmp1 = 0, tmp2 = 0;   
  
  /* Get the registers values */
  tmp1 = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_FE);
  tmp2 = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_RE);

  /* Disable the Falling Edge */
  tmp1 &= ~(uint8_t)IO_Pin;
  /* Disable the Falling Edge */
  tmp2 &= ~(uint8_t)IO_Pin;

  /* Enable the Falling edge if selected */
  if (Edge & EDGE_FALLING)
  {
    tmp1 |= (uint8_t)IO_Pin;
  }

  /* Enable the Rising edge if selected */
  if (Edge & EDGE_RISING)
  {
    tmp2 |= (uint8_t)IO_Pin;
  }

  /* Write back the registers values */
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_FE, tmp1);
  I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_RE, tmp2);
  
  /* if OK return 0 */
  return IOE_OK;
}

/**
  * @brief  Configures the Interrupt line active state and format (level/edge)
  * @param  Polarity: could be
  *   @arg  Polarity_Low: Interrupt line is active Low/Falling edge      
  *   @arg  Polarity_High: Interrupt line is active High/Rising edge      
  * @param  Type: Interrupt line activity type, could be one of the following values
  *   @arg  Type_Level: Interrupt line is active in level model         
  *   @arg  Type_Edge: Interrupt line is active in edge model           
  * @retval IOE_OK: if all initializations are OK. Other value if error.
  */
uint8_t IOE_ITOutConfig(uint8_t Polarity, uint8_t Type)
{
  uint8_t tmp = 0;
  
  /*  Get the register IOE_REG_INT_CTRL value */ 
  tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_INT_CTRL);
  
  /* Mask the polarity and type bits */
  tmp &= ~(uint8_t)0x06;
    
  /* Modify the Interrupt Output line configuration */
  tmp |= (uint8_t)(Polarity | Type);
  
  /* Set the register */
  I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_CTRL, tmp);
  
  
  /*  Get the register IOE_REG_INT_CTRL value */ 
  tmp = I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_INT_CTRL);
  /* Mask the polarity and type bits */
  tmp &= ~(uint8_t)0x06;
    
  /* Modify the Interrupt Output line configuration */
  tmp |= (uint8_t)(Polarity | Type);
  
  /* Set the register */
  I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_INT_CTRL, tmp);  
  
  /* If all OK return IOE_OK */
  return IOE_OK;  
}

/**
  * @brief  Writes a value in a register of the device through I2C.
  * @param  DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
  *         or IOE_2_ADDR. 
  * @param  RegisterAddr: The target register adress
  * @param  RegisterValue: The target register value to be written 
  * @retval IOE_OK: if all operations are OK. Other value if error.
  */
uint8_t I2C_WriteDeviceRegister(uint8_t DeviceAddr, uint8_t RegisterAddr, uint8_t RegisterValue)
{
  uint32_t read_verif = 0;  
  uint8_t IOE_BufferTX = 0;
  
  /* Get Value to be written */
  IOE_BufferTX = RegisterValue;
  
  /* Configure DMA Peripheral */
  IOE_DMA_Config(IOE_DMA_TX, (uint8_t*)(&IOE_BufferTX));
  
  /* Enable the I2C peripheral */
  I2C_GenerateSTART(IOE_I2C, ENABLE);
  
  /* Test on SB Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB) == RESET) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Transmit the slave address and enable writing operation */
  I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
  
  /* Test on ADDR Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
   
  /* Transmit the first address for r/w operations */
  I2C_SendData(IOE_I2C, RegisterAddr);
  
  /* Test on TXE FLag (data dent) */
  IOE_TimeOut = TIMEOUT_MAX;
  while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))  
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Enable I2C DMA request */
  I2C_DMACmd(IOE_I2C,ENABLE);
  
  /* Enable DMA TX Channel */
  DMA_Cmd(IOE_DMA_TX_CHANNEL, ENABLE);
  
  /* Wait until DMA Transfer Complete */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!DMA_GetFlagStatus(IOE_DMA_TX_TCFLAG))
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }  
  
  /* Wait until BTF Flag is set before generating STOP */
  IOE_TimeOut = 2 * TIMEOUT_MAX;
  while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))  
  {
  }
  
  /* Send STOP Condition */
  I2C_GenerateSTOP(IOE_I2C, ENABLE);
  
  /* Disable DMA TX Channel */
  DMA_Cmd(IOE_DMA_TX_CHANNEL, DISABLE);
  
  /* Disable I2C DMA request */  
  I2C_DMACmd(IOE_I2C,DISABLE);
  
  /* Clear DMA TX Transfer Complete Flag */
  DMA_ClearFlag(IOE_DMA_TX_TCFLAG);
  
#ifdef VERIFY_WRITTENDATA
  /* Verify (if needed) that the loaded data is correct  */
  
  /* Read the just written register*/
  read_verif = I2C_ReadDeviceRegister(DeviceAddr, RegisterAddr);
  /* Load the register and verify its value  */
  if (read_verif != RegisterValue)
  {
    /* Control data wrongly tranfered */
    read_verif = IOE_FAILURE;
  }
  else
  {
    /* Control data correctly transfered */
    read_verif = 0;
  }
#endif
  
  /* Return the verifying value: 0 (Passed) or 1 (Failed) */
  return read_verif;
}

/**
  * @brief  Reads a register of the device through I2C.
  * @param  DeviceAddr: The address of the device, could be : IOE_1_ADDR
  *         or IOE_2_ADDR. 
  * @param  RegisterAddr: The target register adress (between 00x and 0x24)
  * @retval The value of the read register (0xAA if Timout occured)   
  */
uint8_t I2C_ReadDeviceRegister(uint8_t DeviceAddr, uint8_t RegisterAddr)
{
  uint8_t IOE_BufferRX[2] = {0x00, 0x00};  
  
  /* Configure DMA Peripheral */
  IOE_DMA_Config(IOE_DMA_RX, (uint8_t*)IOE_BufferRX);
  
  /* Enable DMA NACK automatic generation */
  I2C_DMALastTransferCmd(IOE_I2C, ENABLE);
  
  /* Enable the I2C peripheral */
  I2C_GenerateSTART(IOE_I2C, ENABLE);
  
  /* Test on SB Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB)) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send device address for write */
  I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
  
  /* Test on ADDR Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send the device's internal address to write to */
  I2C_SendData(IOE_I2C, RegisterAddr);  
  
  /* Test on TXE FLag (data dent) */
  IOE_TimeOut = TIMEOUT_MAX;
  while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))  
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send START condition a second time */  
  I2C_GenerateSTART(IOE_I2C, ENABLE);
  
  /* Test on SB Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB)) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send IOExpander address for read */
  I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Receiver);
  
  /* Test on ADDR Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))   
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
    
  /* Enable I2C DMA request */
  I2C_DMACmd(IOE_I2C,ENABLE);
  
  /* Enable DMA RX Channel */
  DMA_Cmd(IOE_DMA_RX_CHANNEL, ENABLE);
  
  /* Wait until DMA Transfer Complete */
  IOE_TimeOut = 2 * TIMEOUT_MAX;
  while (!DMA_GetFlagStatus(IOE_DMA_RX_TCFLAG))
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }        
  
  /* Send STOP Condition */
  I2C_GenerateSTOP(IOE_I2C, ENABLE);
  
  /* Disable DMA RX Channel */
  DMA_Cmd(IOE_DMA_RX_CHANNEL, DISABLE);
  
  /* Disable I2C DMA request */  
  I2C_DMACmd(IOE_I2C,DISABLE);
  
  /* Clear DMA RX Transfer Complete Flag */
  DMA_ClearFlag(IOE_DMA_RX_TCFLAG);
  
  /* return a pointer to the IOE_Buffer */
  return (uint8_t)IOE_BufferRX[0];  
}


/**
  * @brief  Reads a buffer of 2 bytes from the device registers.
  * @param  DeviceAddr: The address of the device, could be : IOE_1_ADDR
  *         or IOE_2_ADDR. 
  * @param  RegisterAddr: The target register adress (between 00x and 0x24)
  * @retval A pointer to the buffer containing the two returned bytes (in halfword).  
  */
uint16_t I2C_ReadDataBuffer(uint8_t DeviceAddr, uint32_t RegisterAddr)
{  
  uint8_t tmp= 0;
  uint8_t IOE_BufferRX[2] = {0x00, 0x00};  
  
  /* Configure DMA Peripheral */
  IOE_DMA_Config(IOE_DMA_RX, (uint8_t*)IOE_BufferRX);
  
  /* Enable DMA NACK automatic generation */
  I2C_DMALastTransferCmd(IOE_I2C, ENABLE);
  
  /* Enable the I2C peripheral */
  I2C_GenerateSTART(IOE_I2C, ENABLE);
  
  /* Test on SB Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB)) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send device address for write */
  I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
  
  /* Test on ADDR Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send the device's internal address to write to */
  I2C_SendData(IOE_I2C, RegisterAddr);  
  
  /* Test on TXE FLag (data dent) */
  IOE_TimeOut = TIMEOUT_MAX;
  while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))  
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send START condition a second time */  
  I2C_GenerateSTART(IOE_I2C, ENABLE);
  
  /* Test on SB Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB)) 
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Send IOExpander address for read */
  I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Receiver);
  
  /* Test on ADDR Flag */
  IOE_TimeOut = TIMEOUT_MAX;
  while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))   
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }
  
  /* Enable I2C DMA request */
  I2C_DMACmd(IOE_I2C,ENABLE);
  
  /* Enable DMA RX Channel */
  DMA_Cmd(IOE_DMA_RX_CHANNEL, ENABLE);
  
  /* Wait until DMA Transfer Complete */
  IOE_TimeOut = 2 * TIMEOUT_MAX;
  while (!DMA_GetFlagStatus(IOE_DMA_RX_TCFLAG))
  {
    if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
  }        
  
  /* Send STOP Condition */
  I2C_GenerateSTOP(IOE_I2C, ENABLE);
  
  /* Disable DMA RX Channel */
  DMA_Cmd(IOE_DMA_RX_CHANNEL, DISABLE);
  
  /* Disable I2C DMA request */  
  I2C_DMACmd(IOE_I2C,DISABLE);
  
  /* Clear DMA RX Transfer Complete Flag */
  DMA_ClearFlag(IOE_DMA_RX_TCFLAG);
  
  /* Reorganize received data */  
  tmp = IOE_BufferRX[0];
  IOE_BufferRX[0] = IOE_BufferRX[1];
  IOE_BufferRX[1] = tmp;
  
  /* return a pointer to the IOE_Buffer */
  return *(uint16_t *)IOE_BufferRX;  
}

/**
  * @brief  Return Touch Screen X position value
  * @param  None
  * @retval X position.
  */
static uint16_t IOE_TS_Read_X(void)
{
  int32_t x, xr;
 
  x = I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_Y);
  
  /* first correction */
  xr =  (x * 320) >> 12;
  /* second correction */
  xr = ((xr * 32)/29) - 17;
  
  if(xr <= 0)
    xr = 0;
  
  return (uint16_t)(xr); 
}

/**
  * @brief  Return Touch Screen Y position value
  * @param  None
  * @retval Y position.
  */
static uint16_t IOE_TS_Read_Y(void)
{
  int32_t y, yr;
  y= I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_X);
  
  yr= (y * 240) >> 12;
  yr = ((yr * 240) / 217) - 12;
  
  if(yr <= 0)
    yr = 0;
  
  return (uint16_t)(yr); 
}

/**
  * @brief  Return Touch Screen Z position value
  * @param  None
  * @retval Z position.
  */
static uint16_t IOE_TS_Read_Z(void)
{
  uint32_t z;
  z = I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_Z);
  
  
  if(z <= 0)
    z = 0;
  
  return (uint16_t)(z); 
}

/**
  * @brief  Initializes the GPIO pins used by the IO expander.
  * @param  None
  * @retval None
  */
static void IOE_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /* Enable IOE_I2C and IOE_I2C_PORT & Alternate Function clocks */
  RCC_APB1PeriphClockCmd(IOE_I2C_CLK, ENABLE);
  RCC_APB2PeriphClockCmd(IOE_I2C_SCL_GPIO_CLK | IOE_I2C_SDA_GPIO_CLK | IOE_IT_GPIO_CLK
                         | RCC_APB2Periph_AFIO, ENABLE);
  
  /* Reset IOE_I2C IP */
  RCC_APB1PeriphResetCmd(IOE_I2C_CLK, ENABLE);
  
  /* Release reset signal of IOE_I2C IP */
  RCC_APB1PeriphResetCmd(IOE_I2C_CLK, DISABLE);
  
  /* IOE_I2C SCL and SDA pins configuration */
  GPIO_InitStructure.GPIO_Pin = IOE_I2C_SCL_PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(IOE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

  /* IOE_I2C SCL and SDA pins configuration */
  GPIO_InitStructure.GPIO_Pin = IOE_I2C_SDA_PIN;
  GPIO_Init(IOE_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);  
  
  /* Set EXTI pin as Input PullUp - IO_Expander_INT */
  GPIO_InitStructure.GPIO_Pin = IOE_IT_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(IOE_IT_GPIO_PORT, &GPIO_InitStructure);
  
  /* Connect IO Expander IT line to EXTI line */
  GPIO_EXTILineConfig(IOE_IT_EXTI_PORT_SOURCE, IOE_IT_EXTI_PIN_SOURCE);
}


/**
  * @brief  Configure the I2C Peripheral used to communicate with IO_Expanders.
  * @param  None
  * @retval None
  */
static void IOE_I2C_Config(void)
{
  I2C_InitTypeDef I2C_InitStructure;
  
  /* IOE_I2C configuration */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0x00;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = IOE_I2C_SPEED;
  
  I2C_Init(IOE_I2C, &I2C_InitStructure);
}

/**
  * @brief  Configure the DMA Peripheral used to handle communication via I2C.
  * @param  None
  * @retval None
  */

static void IOE_DMA_Config(IOE_DMADirection_TypeDef Direction, uint8_t* buffer)
{
  DMA_InitTypeDef DMA_InitStructure;
  
  RCC_AHBPeriphClockCmd(IOE_DMA_CLK, ENABLE);
  
  /* Initialize the DMA_PeripheralBaseAddr member */
  DMA_InitStructure.DMA_PeripheralBaseAddr = IOE_I2C_DR;
  /* Initialize the DMA_MemoryBaseAddr member */
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buffer;
   /* Initialize the DMA_PeripheralInc member */
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  /* Initialize the DMA_MemoryInc member */
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  /* Initialize the DMA_PeripheralDataSize member */
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  /* Initialize the DMA_MemoryDataSize member */
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  /* Initialize the DMA_Mode member */
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  /* Initialize the DMA_Priority member */
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  /* Initialize the DMA_M2M member */
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  
  /* If using DMA for Reception */
  if (Direction == IOE_DMA_RX)
  {
    /* Initialize the DMA_DIR member */
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    
    /* Initialize the DMA_BufferSize member */
    DMA_InitStructure.DMA_BufferSize = 2;
    
    DMA_DeInit(IOE_DMA_RX_CHANNEL);
    
    DMA_Init(IOE_DMA_RX_CHANNEL, &DMA_InitStructure);
  }
   /* If using DMA for Transmission */
  else if (Direction == IOE_DMA_TX)
  { 
    /* Initialize the DMA_DIR member */
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    
    /* Initialize the DMA_BufferSize member */
    DMA_InitStructure.DMA_BufferSize = 1;
    
    DMA_DeInit(IOE_DMA_TX_CHANNEL);
    
    DMA_Init(IOE_DMA_TX_CHANNEL, &DMA_InitStructure);
  }
}

/**
  * @brief  Configures the IO expander Interrupt line and GPIO in EXTI mode.
  * @param  None        
  * @retval None
  */
static void IOE_EXTI_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
 
  /* Enable Button GPIO clock */
  RCC_APB2PeriphClockCmd(IOE_IT_GPIO_CLK | RCC_APB2Periph_AFIO, ENABLE);
  
  /* Configure Button pin as input floating */
  GPIO_InitStructure.GPIO_Pin = IOE_IT_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(IOE_IT_GPIO_PORT, &GPIO_InitStructure);  
  
  /* Connect Button EXTI Line to Button GPIO Pin */
  GPIO_EXTILineConfig(IOE_IT_EXTI_PORT_SOURCE, IOE_IT_EXTI_PIN_SOURCE);  
  
  /* Configure Button EXTI line */
  EXTI_InitStructure.EXTI_Line = IOE_IT_EXTI_LINE;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  /* Enable and set Button EXTI Interrupt to the lowest priority */
  NVIC_InitStructure.NVIC_IRQChannel = IOE_IT_EXTI_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

#ifndef USE_Delay
/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */
static void delay(__IO uint32_t nCount)
{
  __IO uint32_t index = 0; 
  for(index = (100000 * nCount); index != 0; index--)
  {
  }
}
#endif /* USE_Delay*/
/**
  * @}
  */ 

/**
  * @}
  */ 

/**
  * @}
  */  

/**
  * @}
  */ 

/**
  * @}
  */ 
   
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/