spitest.c

LPC23XX ARM的驱动程序库

/*****************************************************************************
 *   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
******************************************************************************/