spi_test.c

基于LPCEB2000-S的SPI程序

#define	LPCEB2000_I

/*********************************************************************************************
* File：	spi_test.c
* Author:	Embest w.h.xie
* Desc：	test spi bus
* History:	
*********************************************************************************************/

/*------------------------------------------------------------------------------------------*/
/*								include files												*/
/*------------------------------------------------------------------------------------------*/

#include   "target.h"

/*------------------------------------------------------------------------------------------*/
/*									define 													*/
/*------------------------------------------------------------------------------------------*/

#define	SPI_Client   P20

/*********************************************************************************************
* name:		time_dly
* func:		display code
* para:		dly			--in, delay value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  time_dly(uint32  dly)
{  
	uint32  i;

	for(; dly>0; dly--) 
		for(i=0; i<500; i++);
}

/*********************************************************************************************
* name:		sys_init
* func:		init the sys
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  sys_init()
{
	// allow PLL
	PLLCON = 1;
	VPBDIV = PLL_VPBDIV;
	PLLCFG = PLL_CFG;

	PLLFEED = 0xaa;
	PLLFEED = 0x55;
	while((PLLSTAT & (1 << 10)) == 0);
	PLLCON = 3;
	PLLFEED = 0xaa;
	PLLFEED = 0x55;

	// set MAM 2 CCLK
	MAMCR   = 0;
	MAMTIM  = MAM_TIM;
	MAMCR   = 2;

	// init all interrupt
	VICIntEnClr = 0xffffffff;
	VICVectAddr = 0;
	VICIntSelect = 0;
}

/*********************************************************************************************
* name:		spi_send
* func:		spi bus send byte
* para:		chr		--in,	send value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void spi_send(uint8 chr)			
{
	IOCLR0 = SPI_Client;

	// send 
	SPI0_SPDR  = chr;
	while( 0==(SPI0_SPSR & 0x80) );
	
	IOSET0	 = SPI_Client;
}

/*********************************************************************************************
* name:		Main
* func:		main fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/

int  main(void)
{
	uint8  i, j;

	// init GPIO , open SPI bus
	PINSEL0 = 0x00005500;
	PINSEL1 = 0x00000000;

	sys_init();
	
	IODIR0 = SPI_Client;

	// set master send
	SPI0_SPCCR = 0x80;
	SPI0_SPCR  = 0x30;

	// send data
	do {
		for (i=0; i<14 ; i++) {  
			j = i;
			if (i>7) {
				j = 14 - i;
			}
			spi_send(~(1 << j));
			time_dly(700);	  
		}
	} while(1);

}