spitest.c

nxp lpc23/24xx spi keil例程

/*****************************************************************************
 *   spitest.c:  main C entry file for NXP LPC23xx/24xx Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2006.07.20  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC23xx.h"                        /* LPC23xx/24xx definitions */
#include "type.h"
#include "irq.h"
#include "spi.h"

BYTE SPICmd[BUFSIZE];
BYTE SPIWRData[BUFSIZE];
BYTE SPIRDData[BUFSIZE];

/*****************************************************************************
** Function name:		SPI0_Test
**
** Descriptions:		Test SPI0 as master interfacing with a Atmel 
**						SPI based Serial EEPROM 25080
**
** parameters:			None
** Returned value:		None
** 
*****************************************************************************/
void SPI0_Test( void )
{
  DWORD i, timeout;

  IOCLR0 = SPI0_SEL;
  /* The tested SPI device is a Atmel 25080 */
  SPICmd[0] = WREN;			/* set write enable latch */
  SPISend( SPICmd, 1 );
  IOSET0 = SPI0_SEL;

  for ( i = 0; i < DELAY_COUNT; i++ );	/* delay minimum 250ns */

  IOCLR0 = SPI0_SEL;
  SPICmd[0] = RDSR;	/* check status to see if write enabled is latched */
  SPISend( SPICmd, 1 );
  SPIReceive( SPIRDData, 1 );
  IOSET0 = SPI0_SEL;
  if ( SPIRDData[0] & (RDSR_WEN|RDSR_RDY) != RDSR_WEN ) 
			/* bit 0 to 0 is ready, bit 1 to 1 is write enable */
  {					
	while ( 1 );	/* Write enable can't be latched, permanent error */
  }

  for ( i = CMD_OFFSET; i < BUFSIZE; i++ )	/* Init RD and WR buffer */    
  {
	SPIWRData[i+CMD_OFFSET] = i;	/* leave three bytes for cmd and addrH and addrL */
	SPIRDData[i] = 0;
  }

  /* please note the first two bytes of WR and RD buffer is used for
  commands and offset, so only 2 through BUFSIZE is used for data read,
  write, and comparison. */
  IOCLR0 = SPI0_SEL;
  SPIWRData[0] = WRITE;	/* Write command is 0x02, low 256 bytes only */
  SPIWRData[1] = 0x00;	/* write address offset is 16 bit, 0x0000 */
  SPIWRData[2] = 0x00;	
  SPISend( SPIWRData, BUFSIZE );
  IOSET0 = SPI0_SEL;

  for ( i = 0; i < DELAY_COUNT; i++ );	/* delay, minimum 250ns */

  timeout = 0;
  while ( timeout < MAX_TIMEOUT )
  {
	IOCLR0 = SPI0_SEL;
	SPICmd[0] = RDSR;	/* check status to see if write cycle is done or not */
	SPISend( SPICmd, 1 );
	SPIReceive( SPIRDData, 1 );		/* Reuse RDData buffer cmd status */
	IOSET0 = SPI0_SEL;

	if ( (SPIRDData[0] & RDSR_RDY) == 0x00 )	/* bit 0 to 0 is ready */
	{
	  break;
	}
	timeout++;
  }
  if ( timeout == MAX_TIMEOUT )
  {
	while ( 1 );
  }

  for ( i = 0; i < DELAY_COUNT; i++ );	/* delay, minimum 250ns */
    
  IOCLR0 = SPI0_SEL;
  SPICmd[0] = READ;		/* Read command is 0x03, low 256 bytes only */
  SPICmd[1] = 0x00;		/* Read address offset is 0x0000 */
  SPICmd[2] = 0x00;
  SPISend( SPICmd, CMD_OFFSET ); 
  SPIReceive( SPIRDData+CMD_OFFSET, BUFSIZE-CMD_OFFSET );
  IOSET0 = SPI0_SEL;

  /* verifying, ignore the difference in the first three bytes */
  for ( i = CMD_OFFSET; i < BUFSIZE; i++ )
  {
	if ( SPIWRData[i] != SPIRDData[i] )
	{
	  while( 1 );			/* Verification failed */
	}
  }
  return;
}

/******************************************************************************
**   Main Function  main()
******************************************************************************/
int main (void)
{	    	
  SPIInit();		/* initialize SPI 0 */
  SPI0_Test();
  return 0;
}

/******************************************************************************
**                            End Of File
******************************************************************************/