spi.c

本驱动程序是基于WinCE系统的s3c2410的SPI驱动源码

//======================================================================
// Name   : SPI.c
// Date   : 2007/03/12
// Author : Xu
// Comment: Driving MCP41010 
//          SPIMOSI0(GPE12) working is in master mode
//          SPICLK0(GPE13) is the master outpuc clock
//          GPG3 is master CS pin
// Version:
// History: 2007/03/12 Create
//======================================================================

#include <windows.h>
#include <types.h>
#include <tchar.h>
#include <cardserv.h>
#include <cardapi.h>
#include <tuple.h>
#include <devload.h>
#include <diskio.h>
#include <nkintr.h>
#include <oalintr.h>
#include <windev.h>
#include "s2410.h"

#define PUBLIC


volatile IOPreg * v_pIOPregs;
volatile SSPreg *v_pSSPregs;

BOOL SPI_InitAddrIO(VOID);
BOOL SPI_InitAddrSPI(void);


//======================================================================
// Name      : InitSPI
// Date      : 2007/03/12
// Author    : XuHaibo
// Parameters:
// Return    : 
// Comment   : 
// Version   :
// History   : 2007/03/12 Create
//======================================================================
void InitSPI(void) //init uart2
{
		unsigned int pclk = S2410PCLK;  // s2410.h define
		                                // #define S2410FCLK       	(203 * 1000 * 1000)		// 203MHz (FCLK).
                                    // #define PCLKDIV         	4						// P-clock (PCLK) divisor.
                                    // #define S2410PCLK       	(S2410FCLK / PCLKDIV)	// PCLK.

		
		// Set I/O is SPI interface
		// Config GPE12,13 is SPIMOSI0,SPICLK0
	  v_pIOPregs->rGPECON &= ~(0x0F << 24); 
	  v_pIOPregs->rGPECON |= (0x0A << 24);	
	  // Config GPG3 is Master SPI CS                                     
	  v_pIOPregs->rGPGCON &= ~(0x3 << 6);                          
	  v_pIOPregs->rGPGCON |= (0x1 << 6);
	  v_pIOPregs->rGPGUP &= ~(0x1 << 3);	
	  // Initialize CS is high      
	  v_pIOPregs->rGPGDAT |= (0x1 << 3);                             
	
    // Baudrate = PCLK/2/(Prescaler value + 1)
    // PCLK = 203000000/4 = 50750000 Hz
    // Prescaler value = 0x18 = 24
    // Baudrate = 50750000/2/(24 + 1) = 1015000 = 1.015MHz
    // MCP41010 max clock frequency is 10MHz
    v_pSSPregs->rSPPRE0 = 0x18;
    
    // Set SPCON0 to configure properly the SPI module.	
    // Master  
    // SCK enable
    // polling mode
    v_pSSPregs->rSPCON0 = 0x18;
    // 0 Tx Auto Garbage Data mode enable (TAGD):Decide whether the receiving data only needs or not.
    //                                           0 = normal mode, 1 = Tx auto garbage data mode
    //                                           NOTE: In normal mode, if you only want to receive data,
    //                                           you should transmit dummy 0xFF data.
    // 1,2 It is possible to operate the devices in SPI modes 0,0and 1,1. (MCP41010 datasheet)
    //     Set SPI mode is 0,0.
    // 3 Set S3C2410 is Master.
    // 4 SCK Enable (ENSCK)
    // 5,6 Determine how and by what SPTDAT is read/written.
    //     00 = polling mode, 01 = interrupt mode
    //     10 = DMA mode, 11 = reserved
    //     Set polling mode
}


//======================================================================
// Name      : InitSPI
// Date      : 2007/03/12
// Author    : XuHaibo
// Parameters:
// Return    : 
// Comment   : 
// Version   :
// History   : 2007/03/12 Create
//======================================================================
BOOL
SPI_InitAddrIO(VOID)
{
		BOOL	RetValue = TRUE;
		
		v_pIOPregs = (volatile IOPreg *)VirtualAlloc(0, sizeof(IOPreg), MEM_RESERVE, PAGE_NOACCESS);

		if (v_pIOPregs == NULL) 
		{
				
//			ERRORMSG(1,(TEXT("For SPI_IOPregs : VirtualAlloc failed!\r\n")));
			RetValue = FALSE;
		}
		else 
		{
			if (!VirtualCopy((PVOID)v_pIOPregs, (PVOID)(IOP_BASE), sizeof(IOPreg), PAGE_READWRITE | PAGE_NOCACHE)) 
			{
//				ERRORMSG(1,(TEXT("For SPI_IOPregs: VirtualCopy failed!\r\n")));
				RetValue = FALSE;
			}
		}
	
		if (!RetValue) 
		{
//			RETAILMSG (1, (TEXT("::: SPI_InitializeAddresses - Fail!!\r\n") ));
			if (v_pIOPregs) 
			{
				VirtualFree((PVOID) v_pIOPregs, 0, MEM_RELEASE);
			}
			v_pIOPregs = NULL;
		}
		else 
		{
			;
//			RETAILMSG (1, (TEXT("::: SPI_InitializeAddresses - Success\r\n") ));
		}

		return(RetValue);
}




//======================================================================
// Name      : InitSPI
// Date      : 2007/03/12
// Author    : XuHaibo
// Parameters:
// Return    : 
// Comment   : 
// Version   :
// History   : 2007/03/12 Create
//======================================================================
BOOL
SPI_InitAddrSPI(void)
{
		BOOL	RetValue = TRUE;

//		RETAILMSG (1, (TEXT("SPI_InitializeAddresses \r\n") ));

		v_pSSPregs = (volatile SSPreg *)VirtualAlloc(0, sizeof(UART2reg), MEM_RESERVE, PAGE_NOACCESS);
		if (v_pSSPregs == NULL) 
		{
//			ERRORMSG(1,(TEXT("For SPI_UART2regs : VirtualAlloc failed!\r\n")));
			RetValue = FALSE;
		}
		else 
		{
			if (!VirtualCopy((PVOID)v_pSSPregs, (PVOID)(UART2_BASE), sizeof(UART2reg), PAGE_READWRITE | PAGE_NOCACHE)) 
			{
//				ERRORMSG(1,(TEXT("For SPI_UART2regs: VirtualCopy failed!\r\n")));
				RetValue = FALSE;
			}
		}
	
		if (!RetValue) 
		{
//			RETAILMSG (1, (TEXT("::: SPI_InitializeAddresses - Fail!!\r\n") ));
			if (v_pSSPregs) 
			{
				VirtualFree((PVOID) v_pSSPregs, 0, MEM_RELEASE);
			}
			v_pSSPregs = NULL;
		}
		else 
		{
			;
//			RETAILMSG (1, (TEXT("SPI_InitializeAddresses - Success\r\n") ));
		}
		return(RetValue);
}