/*  metrowerks sample code  */



#include <stdio.h>
#include <stdlib.h>

#define GPIO_C_Base 0xF310
#define GPIOC_DR GPIO_C_Base+1
#define GPIOC_DDR GPIO_C_Base+2
#define GPIOC_PER GPIO_C_Base+3


#define SPI0_Base 0xF2A0
#define SPI0_SPSCR SPI0_Base+0
#define SPI0_SPDSR SPI0_Base+1
#define SPI0_SPDRR SPI0_Base+2
#define SPI0_SPDTR SPI0_Base+3

#define IPR4 0xF1A4
#define IPR5 0xF1A5
#define GPIOE_PER 0xF333 
#define SIM_PCE 0xF35C


#define SIZE 10


// prototypes                    

void SPI_init();
void GPIO_init();
void set_GPIO();
void clear_GPIO();
void SPI_ISR();


//The example is developed under CW 56800/E version 8.1 and 56F8346EVM
// The SPI is configured as master mode,
//after running the code, user can see SPI signal from J14
//use GPIOC4 as the chip select enable pin for slave SPI device

int main(void)
{
	SPI_init();
	GPIO_init();
	asm(bfclr #$0300,SR); //interrupt enable
	asm(bfset #$0070,x:GPIOE_PER); //configure the GPIO_E4~7 as SPI0 port
	for(;;)
	{
		asm(nop);

	}

}



void SPI_init()
{
	asm
	{//	move.w #$C000,x:IPR4
		move.w #$0003,x:IPR5  //using transmit interrupt
		nop				//; Do nothing
		nop
		move.w #$000F,x:SPI0_SPDSR //;set data length to 16bit
		move.w #$3355,x:SPI0_SPDTR
//		move.w #$1320,x:SPI0_SPSCR //;writing control reg,using SPI receiver interrupt
		move.w #$1170,x:SPI0_SPSCR //;writing control reg,using SPI receiver interrupt
		bfset  #$FFFF,x:SIM_PCE
		nop
		rts
	}
}

void GPIO_init()
{
	*((unsigned int *)GPIOC_DDR) = 0x0010; //set GPIO_C4 as output mode
	*((unsigned int *)GPIOC_PER) = 0x0000; //clear GPIO_C4
	*((unsigned int *)GPIOC_DR)= 0x0010; //set the GPIOC4 to high
	return;
}

void set_GPIO()
{
	asm(bfset #$0010,x:GPIOC_DR);
	asm(nop);
	asm(rts);
}

void clear_GPIO()
{
	asm(bfclr #$0010,x:GPIOC_DR);
	asm(nop);
	asm(rts);
}

void SPI_ISR()
{
asm
{
	nop:
	move.w x:SPI0_SPDRR,x0 //;clear SPDF bit
	nop
    nop
    bfset	#$0010,X:GPIOC_DR
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop
   	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop 
  	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop  
 	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop   
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop    
    
 	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
    nop   
    
    
    bfclr	#$0010,X:GPIOC_DR
	nop
    move.w #$3344,x:SPI0_SPDTR
    nop
    rti
    }
}