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Allow SD card to operate on SPI0
This commit is contained in:
Martin Mueller
@@ -0,0 +1,192 @@
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/*****************************************************************************\
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* efs - General purpose Embedded Filesystem library *
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* --------------------- ----------------------------------- *
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* *
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* Filename : lpc2000_spi.c *
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* Description : This contains the functions needed to use efs for *
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* accessing files on an SD-card connected to an LPC2xxx. *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Lesser General Public *
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* License as published by the Free Software Foundation; either *
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* version 2.1 of the License, or (at your option) any later version. *
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* *
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* This library is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* (c)2005 Martin Thomas *
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* *
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\*****************************************************************************/
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/*
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2006, Bertrik Sikken, modified for LPCUSB
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*/
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/*****************************************************************************/
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#include "type.h"
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#include "usbdebug.h"
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#include "spi.h"
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/*****************************************************************************/
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/* General Purpose Input/Output (GPIO) */
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#define IOPIN0 (*((volatile unsigned long *) 0xE0028000))
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#define IOSET0 (*((volatile unsigned long *) 0xE0028004))
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#define IODIR0 (*((volatile unsigned long *) 0xE0028008))
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#define IOCLR0 (*((volatile unsigned long *) 0xE002800C))
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#define IOPIN1 (*((volatile unsigned long *) 0xE0028010))
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#define IOSET1 (*((volatile unsigned long *) 0xE0028014))
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#define IODIR1 (*((volatile unsigned long *) 0xE0028018))
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#define IOCLR1 (*((volatile unsigned long *) 0xE002801C))
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/* Pin Connect Block */
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#define PINSEL0 (*((volatile unsigned long *) 0xE002C000))
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#define PINSEL1 (*((volatile unsigned long *) 0xE002C004))
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#define PINSEL2 (*((volatile unsigned long *) 0xE002C014))
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/* SPI0 (Serial Peripheral Interface 0) */
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#define S0SPCR *(volatile unsigned int *)0xE0020000
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#define S0SPSR *(volatile unsigned int *)0xE0020004
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#define S0SPDR *(volatile unsigned int *)0xE0020008
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#define S0SPCCR *(volatile unsigned int *)0xE002000C
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#define S0SPTCR *(volatile unsigned int *)0xE0020010
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#define S0SPTSR *(volatile unsigned int *)0xE0020014
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#define S0SPTOR *(volatile unsigned int *)0xE0020018
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#define S0SPINT *(volatile unsigned int *)0xE002001C
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// SP0SPCR Bit-Definitions
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#define CPHA 3
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#define CPOL 4
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#define MSTR 5
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// SP0SPSR Bit-Definitions
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#define SPIF 7
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#define SPI_IODIR IODIR0
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#define SPI_IOSET IOSET0
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#define SPI_PINSEL PINSEL0
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#define SPI_SCK_PIN 4 /* Clock P0.4 out */
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#define SPI_MISO_PIN 5 /* from Card P0.5 in */
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#define SPI_MOSI_PIN 6 /* to Card P0.6 out */
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#define SPI_SS_PIN 7 /* Card-Select P0.7 - GPIO out */
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#define SPI_SCK_FUNCBIT 8
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#define SPI_MISO_FUNCBIT 10
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#define SPI_MOSI_FUNCBIT 12
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#define SPI_SS_FUNCBIT 14
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#define SPI_PRESCALE_REG S0SPCCR
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#define SPI_PRESCALE_MIN 8
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#define SELECT_CARD() IOCLR0 = (1<<SPI_SS_PIN)
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#define UNSELECT_CARD() IOSET0 = (1<<SPI_SS_PIN)
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/*****************************************************************************/
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/*****************************************************************************/
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// Utility-functions which does not toggle CS.
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// Only needed during card-init.
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static U8 my_SPISend(U8 outgoing)
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{
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S0SPDR = outgoing;
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while( !(S0SPSR & (1<<SPIF)) ) { ; }
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return S0SPDR;
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}
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/*****************************************************************************/
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void SPISetSpeed(U8 speed)
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{
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speed &= 0xFE;
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if (speed < SPI_PRESCALE_MIN) {
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speed = SPI_PRESCALE_MIN;
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}
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SPI_PRESCALE_REG = speed;
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}
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/*****************************************************************************/
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void SPIInit(void)
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{
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U8 i;
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DBG("spiInit for SPI(0)\n");
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// setup GPIO
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SPI_IODIR |= (1 << SPI_SCK_PIN) | (1 << SPI_MOSI_PIN) | (1 << SPI_SS_PIN);
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SPI_IODIR &= ~(1 << SPI_MISO_PIN);
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// set Chip-Select high - unselect card
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UNSELECT_CARD();
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SPI_PINSEL |= ( (1<<SPI_SCK_FUNCBIT) | (1<<SPI_MISO_FUNCBIT) |
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(1<<SPI_MOSI_FUNCBIT) );
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// enable SPI-Master
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S0SPCR = (1<<MSTR)|(0<<CPOL);
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// low speed during init
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SPISetSpeed(254);
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/* Send 20 spi commands with card not selected */
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for (i = 0; i < 21; i++) {
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my_SPISend(0xff);
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}
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// SPI clock 15MHz @60MHz PCLK
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SPISetSpeed(2);
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}
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/*****************************************************************************/
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/*****************************************************************************/
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U8 SPISend(U8 outgoing)
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{
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U8 incoming;
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SELECT_CARD();
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S0SPDR = outgoing;
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while( !(S0SPSR & (1<<SPIF)) ) ;
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incoming = S0SPDR;
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UNSELECT_CARD();
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return incoming;
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}
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void SPISendN(U8 * pbBuf, int iLen)
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{
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int i;
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U8 temp;
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SELECT_CARD();
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for (i = 0; i < iLen; i++) {
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S0SPDR = pbBuf[i];
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while( !(S0SPSR & (1<<SPIF)) ) ;
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temp = S0SPDR;
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}
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UNSELECT_CARD();
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}
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void SPIRecvN(U8 * pbBuf, int iLen)
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{
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int i;
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SELECT_CARD();
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for (i = 0; i < iLen; i++) {
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S0SPDR = 0xFF;
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while( !(S0SPSR & (1<<SPIF)) ) ;
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pbBuf[i] = S0SPDR;
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}
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UNSELECT_CARD();
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}
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/*****************************************************************************/
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