spi_main.c

飞思卡尔S12系Serial_Peripheral_Interphase_(SPI)应用范例

/* ======================================================================
 * Project:  SPI_Example    											*
 * file: 	 SPI_main.c													*
 * -------------------------------------------------------------------- *
 * Description:															*
*			SPI Communication between 2 boards					 		*
 *																		*
 * -------------------------------------------------------------------- *
 * Author:  Luis Fdo. Reynoso Covarrubias								*
 * 			Motorola Mexico FAE Team 									*
 * 																		*
 * Last Modification:  18/Dec/02										*
 * =====================================================================*/
#define SLAVE_SELECTED			//define MASTER_SELECTED if this program is for a Master, 
								//		 SLAVE_SELECTED if this is for a slave


#define __DECL__6812DP256_H__

#include <hidef.h>
#include <6812dp256.h>


#ifdef MASTER_SELECTED							

void main(void){ 
unsigned long delay = 0;
	PTP=0xFF;							// Turn off the Leds
	DDRP=0x80;							// Set PORTP as output

SPI0CR1=0xDE; 		/* SPI Interrupts enabled, Transmit Interrupt disabled, SPI enabled, Master Mode, SCK idles hisgh, SCK is issued at the beggining,
						SS output, Data is transferred most significant first*/
SPI0CR2=0x10;		/*Enable MODF Error, Output Buffer Disabled, SPI normally in Wait, Pin Mode Normal*/
SPI0BR=0x43;		// DSPI Module Clock Divisor= 80;  BaudRate=8MHz/80=>100KHz

	do
	{
	SPI0DR=0xAA;								// Send 1st Data
	PTP=0x00;
	while (SPIF_0==0) {};						// Wait until sent
	for (delay=0;delay<100000;delay++){};
	SPI0DR=0x55;								// Send 2nd data
	PTP=0xFF;
	while (SPIF_0==0) {};						// Wait until sent
	for (delay=0;delay<100000;delay++){};
	}while(1);								// Repeat forever
}

#endif


#ifdef SLAVE_SELECTED						
void main(void){ 
	PTP=0xFF;							// Turn off the Leds
	DDRP=0x80;							// Set PORTP as output

SPI0CR1=0xCE; 		/* SPI Interrupts enabled, Transmit Interrupt disabled, SPI enabled, Slave Mode, SCK idles hisgh, SCK is issued at the beggining,
						SS output, Data is transferred most significant first*/
SPI0CR2=0x00;		/*Enable MODF Error, Output Buffer Disabled, SPI normally in Wait, Pin Mode Normal*/
SPI0BR=0x43;		// DSPI Module Clock Divisor= 80;  BaudRate=8MHz/80=>100KHz
EnableInterrupts;	
	do
	{}while(1);
}


/*****************SPI_ISR****************************
*     			SPI Interrupt						*
*													*
****************************************************/
interrupt 19 void SPI_ISR(void)
{	
if (SPIF_0==1)
	{
	SPI0SR;
		if (SPI0DR==0xAA)					// 1st Data received
		{	PTP=0x00;							
		}
		else if (SPI0DR==0x55)				// 2nd Data received  (If both received, toggle)
		{	PTP=0xFF;
		}
	}
else
	SPI0SR;

} //int 19



#endif


/*
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*/