/*****************************************************************************\*              efs - General purpose Embedded Filesystem library              **          --------------------- -----------------------------------          **                                                                             ** Filename : lpc2000_spi.c                                                     ** Description : This  contains the functions needed to use efs for        **               accessing files on an SD-card connected to an LPC2xxx.        **                                                                             ** This library is free software; you can redistribute it and/or               ** modify it under the terms of the GNU Lesser General Public                  ** License as published by the Free Software Foundation; either                ** version 2.1 of the License, or (at your option) any later version.          **                                                                             ** This library is distributed in the hope that it will be useful,             ** but WITHOUT ANY WARRANTY; without even the implied warranty of              ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU           ** Lesser General Public License for more details.                             **                                                                             **                                                    (c)2005 Martin Thomas    **                                                                             *\*****************************************************************************//*	2006, Bertrik Sikken, modified for LPCUSB*//*****************************************************************************/#include "type.h"#include "usbdebug.h"#include "spi.h"/*****************************************************************************//* SPI0 (Serial Peripheral Interface 0) */#define S0SPCR         (*((volatile unsigned char *) 0xE0020000))#define S0SPSR         (*((volatile unsigned char *) 0xE0020004))#define S0SPDR         (*((volatile unsigned char *) 0xE0020008))#define S0SPCCR        (*((volatile unsigned char *) 0xE002000C))#define S0SPTCR        (*((volatile unsigned char *) 0xE0020010))#define S0SPTSR        (*((volatile unsigned char *) 0xE0020014))#define S0SPTOR        (*((volatile unsigned char *) 0xE0020018))#define S0SPINT        (*((volatile unsigned char *) 0xE002001C))/* General Purpose Input/Output (GPIO) */#define IOPIN0         (*((volatile unsigned long *) 0xE0028000))#define IOSET0         (*((volatile unsigned long *) 0xE0028004))#define IODIR0         (*((volatile unsigned long *) 0xE0028008))#define IOCLR0         (*((volatile unsigned long *) 0xE002800C))#define IOPIN1         (*((volatile unsigned long *) 0xE0028010))#define IOSET1         (*((volatile unsigned long *) 0xE0028014))#define IODIR1         (*((volatile unsigned long *) 0xE0028018))#define IOCLR1         (*((volatile unsigned long *) 0xE002801C))/* Pin Connect Block */#define PINSEL0        (*((volatile unsigned long *) 0xE002C000))#define PINSEL1        (*((volatile unsigned long *) 0xE002C004))#define PINSEL2        (*((volatile unsigned long *) 0xE002C014))// SP0SPCR  Bit-Definitions#define CPHA    3#define CPOL    4#define MSTR    5// SP0SPSR  Bit-Definitions#define SPIF	7#define SPI_IODIR      IODIR0#define SPI_SCK_PIN    4		/* Clock       P0.4  out */#define SPI_MISO_PIN   5		/* from Card   P0.5  in  */#define SPI_MOSI_PIN   6		/* to Card     P0.6  out */#define SPI_SS_PIN	   22		/* Card-Select P0.7 - GPIO out */#define SPI_PINSEL     PINSEL0#define SPI_SCK_FUNCBIT   8#define SPI_MISO_FUNCBIT  10#define SPI_MOSI_FUNCBIT  12#define SPI_SS_FUNCBIT    44#define SPI_PRESCALE_REG  S0SPCCR#define SELECT_CARD()   IOCLR0 = (1 << SPI_SS_PIN)#define UNSELECT_CARD() IOSET0 = (1 << SPI_SS_PIN)/*****************************************************************************//*****************************************************************************/// Utility-functions which does not toogle CS.// Only needed during card-init. During init// the automatic chip-select is disabled for SSPstatic U8 my_SPISend(U8 outgoing){	S0SPDR = outgoing;	while (!(S0SPSR & (1 << SPIF)));	return S0SPDR;}/*****************************************************************************/void SPISetSpeed(U8 speed){	speed &= 0xFE;	if (speed < SPI_PRESCALE_MIN) {		speed = SPI_PRESCALE_MIN;	}	SPI_PRESCALE_REG = speed;}void SPIInit(void){	U8 i;	DBG("spiInit for SPI(0)\n");	// setup GPIO	SPI_IODIR |= (1 << SPI_SCK_PIN) | (1 << SPI_MOSI_PIN) | (1 << SPI_SS_PIN);	SPI_IODIR &= ~(1 << SPI_MISO_PIN);	// reset Pin-Functions  	SPI_PINSEL &= ~((3 << SPI_SCK_FUNCBIT) | (3 << SPI_MISO_FUNCBIT) | (3 << SPI_MOSI_FUNCBIT));	SPI_PINSEL |= ((1 << SPI_SCK_FUNCBIT) | (1 << SPI_MISO_FUNCBIT) | (1 << SPI_MOSI_FUNCBIT));	PINSEL1 &= ~(3 << (SPI_SS_FUNCBIT - 32));	PINSEL1 |= (0 << (SPI_SS_FUNCBIT - 32));	// set Chip-Select high - unselect card	UNSELECT_CARD();	// enable SPI-Master	S0SPCR = (1 << MSTR) | (0 << CPOL);	// TODO: check CPOL	// low speed during init	SPISetSpeed(254);	/* Send 20 spi commands with card not selected */	for (i = 0; i < 21; i++) {		my_SPISend(0xff);	}}/*****************************************************************************//*****************************************************************************/U8 SPISend(U8 outgoing){	U8 incoming;	SELECT_CARD();	S0SPDR = outgoing;	while (!(S0SPSR & (1 << SPIF)));	incoming = S0SPDR;	UNSELECT_CARD();	return incoming;}void SPISendN(U8 * pbBuf, int iLen){	int i;	SELECT_CARD();	for (i = 0; i < iLen; i++) {		S0SPDR = pbBuf[i];		while (!(S0SPSR & (1 << SPIF)));	}	UNSELECT_CARD();}void SPIRecvN(U8 * pbBuf, int iLen){	int i;	SELECT_CARD();	for (i = 0; i < iLen; i++) {		S0SPDR = 0xFF;		while (!(S0SPSR & (1 << SPIF)));		pbBuf[i] = S0SPDR;	}	UNSELECT_CARD();}/*****************************************************************************/