spi.c

Taiwan sunplus develop spce3200, it is a test program ----- testboard source code

//#include "Sys_Define.h"

#define PCLK 0x00000001
#define PCSN 0x00008000
#define PSO 0x00001000
#define PSI 0x00000800
#define P_SPI_MODE_CTRL			(volatile unsigned int*)(0x88110000)
#define P_NAND_GPIO_SETUP		(volatile unsigned int*)(0x8820002C)		
#define P_NAND_GPIO_PULL		(volatile unsigned int*)(0x88200030)
#define P_SPI_INTERFACE_SEL		(volatile unsigned int*)(0x882000a4)
#define P_NAND_GPIO_INPUT		(volatile unsigned int*)(0x8820006c) 

void delay( unsigned short time )
{
	unsigned short i;
	for(i=0;i<time;i++);
}
//Following are the code for simulating SPI timing 
///////////////////////////////////////////////////////////////////////////////////////////////////////////
/****************************************************************************************
*  	Function: 
*  	Description: 	Initialize SPI,simulate SPI with software
*  	Syntax: 
*	Modify: 
*	Parameter:  	None
*  	Returns:    	None
*  	Notes: 
****************************************************************************************/
void InitSPI()											//Initialize SPI
{
	*P_SPI_INTERFACE_SEL &= ~0x00000100;				//Disable SPI	
	*P_SPI_MODE_CTRL = 0x0;	//Disable
	*P_NAND_GPIO_PULL |= 0x00009801;
	*P_NAND_GPIO_SETUP |= 0x90018000;
	*P_NAND_GPIO_SETUP &= ~0x08000000;
}

/****************************************************************************************
*  	Function: 
*  	Description: 	Send one byte data on signal line
*  	Syntax: 
*	Modify: 
*	Parameter:  	unsigned char ucData: One byte data to be sent
*  	Returns:    	None
*  	Notes: 
****************************************************************************************/
void putSPIchar(char ucData)
{
	unsigned char i;
	*P_NAND_GPIO_SETUP &= ~PCLK;						//Set clock line to 0
	for(i=8;i>0;)
	{
		i--;
		if( (ucData>>i) & 0x01 )
		{
			*P_NAND_GPIO_SETUP |= PSO;
		}
		else
		{
			*P_NAND_GPIO_SETUP &= ~PSO;
		}
		delay(80);  //60
		*P_NAND_GPIO_SETUP |= PCLK;
		delay(80);
		*P_NAND_GPIO_SETUP &= ~PCLK;
	}
}
/****************************************************************************************
*  	Function: 
*  	Description:	Receive one byte data on signal line
*  	Syntax: 
*	Modify: 
*	Parameter:		None
*  	Returns:		Data received
*  	Notes: 
****************************************************************************************/
unsigned char SPI_RB()
{
	unsigned char i,ucRxData;
	*P_NAND_GPIO_SETUP &= ~PCLK;						//Set clock line to 0
	for(i=8;i>0;i--)
	{		
		delay(10);
		ucRxData <<=1;
		*P_NAND_GPIO_SETUP |= PCLK;
		if( (*P_NAND_GPIO_INPUT) & PSI )
		{
			ucRxData |= 1;
		}
		delay(10);
		*P_NAND_GPIO_SETUP &= ~PCLK;
	}
	return ucRxData;
}
/****************************************************************************************
*  	Function: 
*  	Description:	Write SPI short address, that is, write one byte data to one byte address
*  	Syntax: 
*	Modify: 
*	Parameter:		unsigned char Address: Register address to be written
					unsigned char *DataPtr: Data poiter to be written
*  	Returns:		None
*  	Notes: 
****************************************************************************************/
void putSPIchar2(unsigned char Address, unsigned char Data)
{	
	*P_NAND_GPIO_SETUP &= ~PCSN;						//Set enable line to 0
	delay(10);
	
  	putSPIchar(Address);
  	
  	putSPIchar(Data);

	*P_NAND_GPIO_SETUP |= PCSN;							//Set enable line to 1
	
}

/****************************************************************************************
*  	Function: 
*  	Description:	Read SPI short address, that is, read one byte data from one byte address
*  	Syntax: 
*	Modify: 
*	Parameter:		unsigned char Address: Register address to be read
					unsigned char *DataPtr: Pointer of saving the read data
*  	Returns:		None
*  	Notes: 
****************************************************************************************/ 
unsigned char getSPIchar(unsigned char Address)
{ 	
 	unsigned char Data;

	*P_NAND_GPIO_SETUP &= ~PCSN;						//Set enable line to 0
	delay(10);
	
  	putSPIchar(Address);
  	
  	Data = SPI_RB();

	*P_NAND_GPIO_SETUP |= PCSN;							//Set enable line to 1
	return Data;
}