hsb/S - Software/0 - HSB MRTS Kathode-MCP/3 - Implementation/0 - Code/Platform/src/gpio.c

// -----------------------------------------------------------------------------
/// @file  gpio.c
/// @brief Description
// -----------------------------------------------------------------------------
//  Micro-Key bv
//  Industrieweg 28, 9804 TG Noordhorn
//  Postbus 92, 9800 AB Zuidhorn
//  The Netherlands
//  Tel: +31 594 503020
//  Fax: +31 594 505825
//  Email: support@microkey.nl
//  Web: www.microkey.nl
// -----------------------------------------------------------------------------
/// $Revision$
/// $Author$
/// $Date$
//  (c) 2017 Micro-Key bv
// -----------------------------------------------------------------------------

/// @file gpio.c
/// @ingroup {group_name}


// -----------------------------------------------------------------------------
// Include files
// -----------------------------------------------------------------------------

#include "stm32f10x_gpio.h"

#include "gpio.h"
#include "Logger.h"

// -----------------------------------------------------------------------------
// Constant and macro definitions
// -----------------------------------------------------------------------------



// -----------------------------------------------------------------------------
// Type definitions
// -----------------------------------------------------------------------------


// -----------------------------------------------------------------------------
// File-scope variables
// -----------------------------------------------------------------------------



// -----------------------------------------------------------------------------
// Function declarations
// -----------------------------------------------------------------------------

static ErrorStatus write(const struct IODevice* self, const char* buffer, size_t length);
static ErrorStatus read(const struct IODevice* self, char* buffer, size_t length, size_t* actualLength);

// -----------------------------------------------------------------------------
// Function definitions
// -----------------------------------------------------------------------------


ErrorStatus GPIO_construct(struct Gpio* self, GpioDirection direction, T_PL_GPIO io)
{
   ErrorStatus returnValue = SUCCESS;
   if (!self->initialized)
   {
      returnValue = IODevice_construct(&self->device, read, write);
      if (returnValue == SUCCESS)
      {
         self->direction = direction;
         self->gpio = io;
         self->initialized = true;
      }
   }
   else
   {
      returnValue = ERROR;
   }


   return returnValue;
}


ErrorStatus GPIO_setValue(struct Gpio* self, bool value)
{
   ErrorStatus returnValue = SUCCESS;
   if (self->initialized)
   {
      if (self->direction == OUTPUT)
      {
         // Writing to output is valid
         if (value)
            {
               GPIO_SetBits(self->gpio.GPIO_Typedef, self->gpio.GPIO_InitStruct.GPIO_Pin);
               self->status = true;
            }
         else
         {
            {
               GPIO_ResetBits(self->gpio.GPIO_Typedef, self->gpio.GPIO_InitStruct.GPIO_Pin);
               self->status = false;
            }
         }
      }
      else
      {
         // Writing to input is invalid
         returnValue = ERROR;
      }
   }
   else
   {
      returnValue = ERROR;
   }
   return returnValue;
}


ErrorStatus GPIO_getValue(struct Gpio* self, bool* value)
{
   ErrorStatus returnValue = SUCCESS;
   if (self->initialized)
   {
      if (self->direction == OUTPUT)
      {
         // Reading an output is impossible - but returning its current status is valid
         if(GPIO_ReadOutputDataBit(self->gpio.GPIO_Typedef, self->gpio.GPIO_InitStruct.GPIO_Pin) != 0)
         {
            *value = true;
            self->status = true;
         }
         else
         {
            *value = false;
            self->status = false;
         }
      }
      else
      {
         // Read value on input
         if(GPIO_ReadInputDataBit(self->gpio.GPIO_Typedef, self->gpio.GPIO_InitStruct.GPIO_Pin) != 0)
         {

            *value = true;
            self->status = true;
         }
         else
         {
            *value = false;
            self->status = false;
         }
      }
   }
   else
   {
      returnValue = ERROR;
   }

   return returnValue;
}


static ErrorStatus write(const struct IODevice* self, const char* buffer, size_t length)
{
   ErrorStatus returnValue = SUCCESS;
   if (buffer[0] != 0)
   {
      returnValue = GPIO_setValue((struct Gpio*)self, true);
   }
   else
   {
      returnValue = GPIO_setValue((struct Gpio*)self, false);
   }

   return returnValue;
}


static ErrorStatus read(const struct IODevice* self, char* buffer, size_t length, size_t* actualLength)
{
   ErrorStatus returnValue = SUCCESS;
   bool value;

   (void)length;
   *actualLength = 1;
   returnValue = GPIO_getValue((struct Gpio*)self, &value);
   *buffer = (char)value;

   return returnValue;
}