spi.c

LF2407A上的SPI端口的测试程序

#include "SEED-DEC2407.h"
#include "SPI.h"  
#define Spi_Int	1
unsigned int j,spi_data[100];

void main()
{
	unsigned int i;
	i = 0;
	j = 0;
	DINT;
	SystemInit();
	SpiInit();
	#if	Spi_Int	
	*IFR = 0x3f;
	*IMR = 0x01;
	EINT; 
	#endif
	for(;;)
	{
		if(SpiTxReady() == TRUE)
		{
			*SPITXBUF = 0x55+j;
			for(i=0; i<0x1fff;i++);
		}
		
		#if	!Spi_Int
		if(SpiRxReady() == TRUE)
		{
			spi_data[j] = *SPIRXBUF; 
			j++; 
			if(j == 100)
			{
				j = 0;
			}   
		}
		#endif
	}
}

void SystemInit(void)
{
	WSGR = 0;	
	*WDCR = 0x68;
	*SCSR1 = 0x220;
}

void SpiInit(void)
{
	*MCRB = 0x3c;
	
	*SPICCR = 0x0f;
	*SPICTL = 0x07;
	*SPIBRR = 0x7f;
	*SPIPRI = 0x10;	
	*SPICCR = 0x8f; 
}

unsigned int SpiTxReady(void)
{
	if((*SPISTS & 0x20) == 0x20)
	{
		return(FALSE);
	}
	else
	{
		return(TRUE);
	}
}

unsigned int SpiRxReady(void)
{
	if((*SPISTS & 0x40) == 0x40)
	{
		return(TRUE);
	}
	else
	{
		return(FALSE);
	}
} 

interrupt void PHANTOM(void)
{

} 

interrupt void c_int1(void)
{
	unsigned int k;
	if((*PIVR & 0x05) == 0x05)
	{
		spi_data[j] = *SPIRXBUF; 
		j++; 
		if(j == 100)
		{
			j = 0;
		} 
	}
	*IFR = 0x01; 
	EINT;    
}