spi_test.c

两片DSP2812完成简单的CAN通讯功能,并通过七段数码管的显示,内容为发送实验箱传送的数据。

#include "DSP28_Device.h"
//Relative to spi_receive,not use rightnow

//for ecan
//#define		LED1_ON		GpioDataRegs.GPFDAT.bit.GPIOF14=1
//#define		LED1_OFF	GpioDataRegs.GPFDAT.bit.GPIOF14=0

void mailbox_check(int32 T1,int32 T2,int32 T3);
void mailbox_read(int16 i);
void Gpio_select(void);
//for spi
unsigned int Spi_VarRx[100];
unsigned int i,j;
//-------------------------
//for ecan
unsigned int Led_Flag;
Uint32 ErrorCount;
Uint32 MessageReceiveCount;
 Uint32 TestMbox1;
 Uint32 TestMbox2;
 Uint32 TestMbox3;


extern unsigned int Int_Flag;

void main(void)
{
  unsigned int shownum;
    //countnum = 0;
	/*初始化系统*/
	InitSysCtrl();
	/* 关中断 */
	DINT;
	IER = 0x0000;
	IFR = 0x0000;
	/* 初始化PIE控制寄存器 */
	InitPieCtrl();
	/* 初始化PIE参数表 */
	InitPieVectTable();	
	/* 初始化外设寄存器 */
	InitPeripherals();
	//for ecan
	Gpio_select();/////////
	
		/*初始化SCIA寄存器*/
    InitECan();
	
	
    #if	Spi_Int
	EALLOW;	// This is needed to write to EALLOW protected registers
	PieVectTable.SPITXINTA = &SPITXINTA_ISR;
	PieVectTable.SPIRXINTA = &SPIRXINTA_ISR;
	EDIS;   // This is needed to disable write to EALLOW protected registers
	/* 设置IER寄存器 */
	IER |= M_INT6;
	#endif
	
	/* 开中断 */
	EINT;   // Enable Global interrupt INTM
	ERTM;	// Enable Global realtime interrupt DBGM
	Intensity(11);
	ScanLimit(7);
	DisplayTest();
	ShutDown(NO); 
	DecodeMode(0x0ff);
	while(1)
	{
	mailbox_read(5);
	MessageReceiveCount++;
	 if((Spi_TxReady() == 1))
	   {
	 	
	 	shownum=BIN2BCD(TestMbox1);
	 	ShowBCD(shownum);
	

	   }
	}
}

void Gpio_select(void)
{
	EALLOW;	
	GpioMuxRegs.GPFMUX.bit.CANTXA_GPIOF6=1;
	GpioMuxRegs.GPFMUX.bit.CANRXA_GPIOF7=1;
	GpioMuxRegs.GPFMUX.bit.XF_GPIOF14=0;
    GpioMuxRegs.GPFDIR.bit.GPIOF14=1; 
    EDIS;
     
} 

    	
/*读取邮箱中的内容*/
void mailbox_read(int16 MBXnbr)
{
   volatile struct MBOX *Mailbox;
   Mailbox = &ECanaMboxes.MBOX0 + MBXnbr;
   TestMbox1 = Mailbox->MDRL.all; // = 0x9555AAAn (n is the MBX number)
   TestMbox2 = Mailbox->MDRH.all; // = 0x89ABCDEF (a constant)
   TestMbox3 = Mailbox->MID.all;// = 0x9555AAAn (n is the MBX number)

}   // MSGID of a rcv MBX is transmitted as the MDL data.


void mailbox_check(int32 T1, int32 T2, int32 T3)
{

    int i;
    
    if((T1 != T3) || ( T2 != 0x89ABCDEF))
    {
       ErrorCount++;
       /* LED1_ON;
        for(i = 0; i < 0x5555; i++);
        LED1_OFF;
        for(i = 0; i < 0x5555; i++);*/
    }else
    {
//    LED1_ON;
    for(i = 0; i < 0x8000; i++);
    //LED1_OFF;
    for(i = 0; i < 0x8000; i++);
    }
}

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// No more.
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