#include "eeprom_at25df021.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_spi.h"

/* Private variables ---------------------------------------------------------*/
SPI_InitTypeDef  SPI_InitStructure;

/*-----------------------------------------------------------------------------
ROUTINE NAME : SPI_Init
INPUT/OUTPUT : None

DESCRIPTION  : Configure the SPI peripheral

COMMENTS     :
-----------------------------------------------------------------------------*/

void SPI_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);


  /* Configure SPI1 pins: SCK, MISO and MOSI ---------------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);  
  GPIO_SetBits(GPIOA, GPIO_Pin_4);
  
  /* SPI1 configuration */
  SPI_I2S_DeInit(SPI1);
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

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

}            

 
     

/*-----------------------------------------------------------------------------
ROUTINE NAME : Chk_WP_Bit
INPUT/OUTPUT : None/Boolean

DESCRIPTION  : Return 'TRUE' if write is still in progress in the EEPROM (M95040)

COMMENTS     :
-----------------------------------------------------------------------------*/

/*void Chk_WP_Bit(void)
{
  u8 i;
  SPI_Cmd(SPI1, ENABLE);//SetBit(SPICR,6);  // spi enable

  GPIO_ResetBits(GPIOA,GPIO_Pin_4);
  //SPI_SendByte(RDSR);  
  //SPI_SendByte(RDSR); 
 
  while((SPI1->SR & SPI_I2S_FLAG_TXE) == RESET);       
  SPI1->DR=RDSR;
  while((SPI1->SR & SPI_I2S_FLAG_RXNE) == RESET);
  i=SPI1->DR;  
  while((SPI1->SR & SPI_I2S_FLAG_TXE) == RESET);       
  SPI1->DR=RDSR;
  while((SPI1->SR & SPI_I2S_FLAG_RXNE) == RESET);
  i=SPI1->DR;   
 
 GPIO_SetBits(GPIOA,GPIO_Pin_4);//SetBit(PADR,6);
 SPI_Cmd(SPI1, DISABLE);//ClrBit(SPICR,6);  // spi disable


 if(((SPI1->DR)|0xFE)==0xFE) return(TRUE);//(ValBit(SPIDR,0)) return(TRUE);
 else 
 return(FALSE);
}*/



     
/*-----------------------------------------------------------------------------
ROUTINE NAME : Read_EEPROM
INPUT/OUTPUT : u8 (adress) / u8 (data)

DESCRIPTION  : Return data located at the adress specified

COMMENTS     :
-----------------------------------------------------------------------------*/
 
void Read_EEPROM(u32 add)
{
  u32 data;

  SPI_Cmd(SPI1, ENABLE);//SetBit(SPICR,6);  // spi enable
  GPIO_ResetBits(GPIOA,GPIO_Pin_4);  
  SPI_SendByte(READ); 
  SPI_SendByte(add);  
  data=SPI_ReadByte();
  GPIO_SetBits(GPIOA,GPIO_Pin_4);  
  SPI_Cmd(SPI1, DISABLE);//ClrBit(SPICR,6);  // spi disable   
  return (data);  
}
 
                                
 
 
/*-----------------------------------------------------------------------------
ROUTINE NAME : Send_EEPROM
INPUT/OUTPUT : u8,u8 (adress,data) / None 

DESCRIPTION  : Send data byte to the adress specified

COMMENTS     :
-----------------------------------------------------------------------------*/

void Send_EEPROM(u32 add, u32 data)
{


  SPI_Cmd(SPI1, ENABLE);//SetBit(SPICR,6);  // spi enable
  GPIO_ResetBits(GPIOA,GPIO_Pin_4);//ClrBit(PADR,6);

  SPI_SendByte(WREN);
  GPIO_SetBits(GPIOA,GPIO_Pin_4);//SetBit(PADR,6);        

        
  GPIO_ResetBits(GPIOA,GPIO_Pin_4);//ClrBit(PADR,6);         
  SPI_SendByte(WRITE);
  SPI_SendByte(add);        
  SPI_SendByte(data);

  GPIO_SetBits(GPIOA,GPIO_Pin_4);//SetBit(PADR,6);
  SPI_Cmd(SPI1, DISABLE);//ClrBit(SPICR,6);  // spi disable  
 

}
 


/*******************************************************************************
* Function Name  : SPI_SendByte
* Description    : Sends a byte through the SPI interface and return the byte
*                  received from the SPI bus.
* Input          : byte : byte to send.
* Output         : None
* Return         : The value of the received byte.
*******************************************************************************/
void SPI_SendByte(u8 byte)
{
  /* Loop while DR register in not emplty */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

  /* Send byte through the SPI1 peripheral */
  SPI_I2S_SendData(SPI1, byte);

  /* Wait to receive a byte */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return the byte read from the SPI bus */
  return SPI_I2S_ReceiveData(SPI1);
}
/*******************************************************************************
* Function Name  : SPI_ReadByte
* Description    : Reads a byte from the SPI Flash.
*                  This function must be used only if the Start_Read_Sequence
*                  function has been previously called.
* Input          : None
* Output         : None
* Return         : Byte Read from the SPI Flash.
*******************************************************************************/
void SPI_ReadByte(void)
{
  return (SPI_SendByte(0x55));
}  


/*-----------------------------------------------------------------------------*/
 
void Delay_us(u16 us)
{
    while(us--);
}
/*-----------------------------------------------------------------------------
ROUTINE NAME : Delay_ms
INPUT/OUTPUT : ms

DESCRIPTION  : 

COMMENTS     :
-----------------------------------------------------------------------------*/

void Delay_ms(u16 ms)
{
    u16 i,j;
    for(i=0;i<ms;i++)
        {
    for(j=0;j<15;j++)
        {
    Delay_us(1);
        }
        }
    
}