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This file defines the interface to the lpc22xx SPI module.
Copyright (C) 2006 Embedded Artists AB (
This file may be included in software not adhering to the GPL.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef SPI_H
#define SPI_H
#include <config.h>
#include <common.h>
#include <asm/errno.h>
#include <asm/arch/hardware.h>
#define SPIF 0x80
#define spi_lock() disable_interrupts();
#define spi_unlock() enable_interrupts();
extern unsigned long spi_flags;
extern unsigned char spi_idle;
int spi_init(void);
static inline unsigned char spi_read(void)
unsigned char b;
PUT8(S0SPDR, spi_idle);
while (!(GET8(S0SPSR) & SPIF));
b = GET8(S0SPDR);
return b;
static inline void spi_write(unsigned char b)
PUT8(S0SPDR, b);
while (!(GET8(S0SPSR) & SPIF));
GET8(S0SPDR); /* this will clear the SPIF bit */
static inline void spi_set_clock(unsigned char clk_value)
PUT8(S0SPCCR, clk_value);
static inline void spi_set_cfg(unsigned char phase,
unsigned char polarity,
unsigned char lsbf)
unsigned char v = 0x20; /* master bit set */
if (phase)
v |= 0x08; /* set phase bit */
if (polarity) {
v |= 0x10; /* set polarity bit */
spi_idle = 0xFF;
} else {
spi_idle = 0x00;
if (lsbf)
v |= 0x40; /* set lsbf bit */
PUT8(S0SPCR, v);
#endif /* SPI_H */