//The example is developed by XiangJun Rong
//Development platform:CW10.2 and 56F84789 tower board
//The SPI is set up in mster mode, interrupt or DMA mode
//
//The code use both interrupt and DMA mode
//conclusion:connect GPIOC10(pin 22 of J502,MOSI), GPIOC9(pin20 of J502,SCK)
//GPIOC7(pin16 of J502),/SS pin, user can see SPI signals.
//
//



/*  freescale sample code  */



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

#include "derivative.h" /* include peripheral declarations */
void DMA_conpleteISR(void);
void SPI_Init(void);
void DMA_init();
void DMA1_interrupt_init(void);
void enable_spi(void);
void spi_isr(void);
void delay(void);

#define DMA_MODE 1

/* this macro attempt to enable watchdog module */
#if	defined (COP_CTRL)
	#define EnableWatchdog \
		COP_CTRL |= (0x2);
#elif defined ( COPCTL )
	#define EnableWatchdog \
		COPCTL |= (0x2);
#else
	#define EnableWatchdog	\
	printf(" no watchdog enable procedure\n");
#endif // #define EnableWatchdog

/* this macro attempt to disable watchdog module */
#if	defined (COP_CTRL)
	#define DisableWatchdog \
		COP_CTRL &= ~(0x2);
#elif defined ( COPCTL )
	#define DisableWatchdog \
		COPCTL &= ~(0x2);
#else
	#define DisableWatchdog	\
	printf(" no watchdog disable procedure\n");
#endif // #define DisableWatchdog

#define SIZE 16
unsigned int temp;
// prototypes                    

unsigned int array[SIZE]={
		0x3355,0x00FF,0x3355,0x00FF,0x3355,0x00FF,0x3355,0x00FF,0x3355,0x00FF,\
		0x3355,0x00FF,0x3355,0x00FF,0x3355,0x00FF
};


int main(void)
{
	DisableWatchdog;
#if DMA_MODE
	DMA_init();
	DMA1_interrupt_init();
	SPI_Init();
	INTC_IPR6=0x00;
	QSPI0_SPDSR|=0x4000; //enable SPI Transmitter DMA
	QSPI0_SPSCR&=0xFDFF; //clear the SPIRIE bit
	enable_spi();
#else
	SPI_Init();
	enable_spi();
#endif	

	asm(bfclr #$300,SR);
	QSPI0_SPDTR=0x3355;
	for(;;);
	return(0);

}

void SPI_Init(void)
{
	//enable SPI0 pin as SPI mode
	//enable SPI clock
	SIM_PCE1|=0x0380; //enable all SPI
	SIM_PCE0=0x007F;
	//100 package DSC
	//pin50:GPIOC7/SS0/TXD0
	//pin52:GPIOC8/MISO0/RXD0/XB_In9
	//pin53:GPIOC9/SCK0/XB_IN4
	//pin54:GPIOC10/MOSI0/XB_In5/MISO0
	GPIOC_PER=0x0780; //configure GPIOC7~10 as SPI0 pins
	SIM_GPSCL&=0x3FFF; //clear C7 bit,/SS0 will be SS0
	SIM_GPSCH&=0xFFC0; //clear C8/C8/C10 bits, C8 is MISO0,C9 is CLK0/C10 is MOSO0
	//enable SPI clock
	

	//configure the SPI control reg
	//set the SPI in master mode,
	QSPI0_SPSCR=0x8340; //master,MSB,enable Receiver Full interrupt,disable SPI, set CPHA bit
	QSPI0_SPDSR=0x05CF; //in master mode, the /SS pin can be connected to /SS of slave SPI
	QSPI0_SPWAIT=0x3FF;
	INTC_IPR6=0xc0; //set SPI0_Receiver interrupt priority
	return;
}
//DMA do the transfer function from memory buffer to SPI transmitter reg
void DMA_init()
{
	//initialize the DMA0
	//DMA0, 2, SPI0_RF Reciever Full, triggering source
	//DMA1, 2, SPI0_TE Transmit Empty,triggering source
	DMA_REQC=0x20000;  //set SPI0_TE trigger DMA
	DMA_SAR1=(long)&array[0]<<1;
	DMA_DAR1=(long)FQSPI0_SPDTR<<1;
	DMA_DSR_BCR1=0x04;
	DMA_DCR1=0x70642000;
}

void enable_spi(void)
{
	QSPI0_SPSCR|=0x20;
	return;
}

void DMA1_interrupt_init(void)
{
	//setting the priority of DMA1 interrupt
	INTC_IPR3=0x0030;
	//enable DMA interrupt
	DMA_DCR1|=0x80000000;
}

#pragma interrupt saveall
void DMA_conpleteISR(void)
{
	//clear interrupt
	DMA_DSR_BCR1=0x01000000;
	DMA_DSR_BCR1|=0x4;
	asm(nop);

}

#pragma interrupt saveall
void spi_isr(void)
{
	//clear interrupt
	temp=QSPI0_SPDRR;
	delay();	
	QSPI0_SPDTR=0x3355;
	asm(nop);


}

void delay(void)
{
	unsigned int i;
	for(i=0;i<1000;i++)
	{
		asm(nop);
		asm(nop);

	}	
}