spi_lpc214x.c

智林z2148开发板测试源码

/*----------------------------------------------------------------------------
 *      R T L  -  F l a s h   F i l e   S y s t e m
 *----------------------------------------------------------------------------
 *      Name:    SPI_LPC214X.C 
 *      Purpose: Serial Peripheral Interface Driver for Philips LPC214x
 *      Rev.:    V3.05 / 22-mar-2007
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2007 KEIL - An ARM Company. All rights reserved. 
 *---------------------------------------------------------------------------*/

#include <File_Config.h>
#include <LPC214x.H>                 /* LPC214x definitions                  */

/* SSPSR - bit definitions. */
#define TFE     0x01
#define TNF     0x02
#define RNE     0x04
#define RFF     0x08
#define BSY     0x10

/*----------------------------------------------------------------------------
 *      SPI Driver Functions
 *----------------------------------------------------------------------------
 *  Required functions for SPI driver module:
 *   - void spi_init ()
 *   - U8   spi_send (U8 outb)
 *   - void spi_hi_speed (BOOL on)
 *---------------------------------------------------------------------------*/

/*--------------------------- spi_init --------------------------------------*/

void spi_init (void) {
   /* Initialize and enable the SSP Interface module. */
   U32 i;

   /* SSEL is GPIO, output set to high. */
   IODIR0  |= 1<<20;
   IOSET0   = 1<<20;
   /* SCK1, MISO1, MOSI1 are SSP pins. */
   PINSEL1  = (PINSEL1 & ~0x000003FC) | 0x000000A8;

   /* Enable SPI in Master Mode, CPOL=1, CPHA=1 (Clock low-active). */
   SSPCR0 = 0x00C7;
   SSPCR1 = 0x0002;
   SSPCPSR = 0xFE;

   /* Send SPI Command with card not selected at 400 KBit. */
   for (i = 0; i < 16; i++) {
      spi_send (0xFF);
   }

   /* Enable SSP auto select. */
   PINSEL1 |= 0x00000200;
}


/*--------------------------- spi_hi_speed ----------------------------------*/

void spi_hi_speed (BOOL on) {
   /* Set a SPI clock speed to desired value. */

   if (on == __TRUE) {
      /* Max. 20 MBit used for Data Transfer. */
      SSPCPSR = 0x02;
   }
   else {
      /* Max. 400 kBit used in Card Initialization. */
      SSPCPSR = 0xFE;
   }
}


/*--------------------------- spi_send --------------------------------------*/

U8 spi_send (U8 outb) {
   /* Write and Read a byte on SPI interface. */
   U8 inb;

   /* Wait if TNF cleared, Tx FIFO is full. */
   while ((SSPSR & TNF) == 0);
   SSPDR = outb;
   /* Wait if RNE cleared, Rx FIFO is empty. */
   while ((SSPSR & RNE) == 0);
   inb = SSPDR;
   return (inb);
}


/*----------------------------------------------------------------------------
 * end of file
 *---------------------------------------------------------------------------*/