gpio_application.c.c

dsp2812的GPIO的应用程序 通用输入输出接口的应用 寄存器的设置

//###########################################################################
//
// 文件名称：GPIO_application.c
//
// 功能描述：DSP28 GPIO - Port B7..B0  ： 8-Bit LED, 
//			CPU Timer0 ISR 周期 50 ms
//			看门狗使能，在定时器中断及主程序的循环中处理
//
//###########################################################################





#include "DSP281x_Device.h"

// Prototype statements for functions found within this file.

void Gpio_select(void);

void InitSystem(void);
interrupt void cpu_timer0_isr(void); // Prototype for Timer 0 Interrupt Service Routine

void main(void)
{
	unsigned int i;
	unsigned int LED[8]= {0x0001,0x0002,0x0004,0x0008,
	                      0x0010,0x0020,0x0040,0x0080};	
	
	InitSystem();		// Initialize the DSP's core Registers
	
	
	Gpio_select();		// Setup the GPIO Multiplex Registers
	
	InitPieCtrl();		// Function Call to init PIE-unit ( code : DSP281x_PieCtrl.c)
	
	InitPieVectTable(); // Function call to init PIE vector table ( code : DSP281x_PieVect.c )
	
	// re-map PIE - entry for Timer 0 Interrupt 
	EALLOW;  // This is needed to write to EALLOW protected registers
   	PieVectTable.TINT0 = &cpu_timer0_isr;
   	EDIS;    // This is needed to disable write to EALLOW protected registers
	
	InitCpuTimers();
	
	// Configure CPU-Timer 0 to interrupt every 50 ms:
	// 150MHz CPU Freq, 50000 祍econds interrupt period
    ConfigCpuTimer(&CpuTimer0, 150, 50000);
    
    // Enable TINT0 in the PIE: Group 1 interrupt 7
   	PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

	// Enable CPU INT1 which is connected to CPU-Timer 0:
    IER = 1;
    
	// Enable global Interrupts and higher priority real-time debug events:
   	EINT;   // Enable Global interrupt INTM
   	ERTM;   // Enable Global realtime interrupt DBGM
   	
   	CpuTimer0Regs.TCR.bit.TSS = 0;
   	
	while(1)
	{    
  	    for(i=0;i<14;i++)
  	    {
    		if(i<7) GpioDataRegs.GPBDAT.all = LED[i];
    	  	else  	GpioDataRegs.GPBDAT.all = LED[14-i]; 
    		
    		while(CpuTimer0.InterruptCount < 3); // wait for Timer 0
  			CpuTimer0.InterruptCount = 0;
    		EALLOW;
    		SysCtrlRegs.WDKEY = 0xAA;		// and serve watchdog #2		
	    	EDIS;
	    }
    }
} 	

void Gpio_select(void)
{
	EALLOW;
	GpioMuxRegs.GPAMUX.all = 0x0;	// all GPIO port Pin's to I/O
    GpioMuxRegs.GPBMUX.all = 0x0;   
    GpioMuxRegs.GPDMUX.all = 0x0;
    GpioMuxRegs.GPFMUX.all = 0x0;		 
    GpioMuxRegs.GPEMUX.all = 0x0; 
    GpioMuxRegs.GPGMUX.all = 0x0;			
										
    GpioMuxRegs.GPADIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPBDIR.all = 0x00FF;	// GPIO Port B15-B8 input , B7-B0 output
    GpioMuxRegs.GPDDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPEDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPFDIR.all = 0x0;	// GPIO PORT  as input
    GpioMuxRegs.GPGDIR.all = 0x0;	// GPIO PORT  as input

    GpioMuxRegs.GPAQUAL.all = 0x0;	// Set GPIO input qualifier values to zero
    GpioMuxRegs.GPBQUAL.all = 0x0;
    GpioMuxRegs.GPDQUAL.all = 0x0;
    GpioMuxRegs.GPEQUAL.all = 0x0;
    EDIS;
}     



void InitSystem(void)
{
   	EALLOW;
   	SysCtrlRegs.WDCR= 0x00AF;		// Setup the watchdog 
   									// 0x00E8  to disable the Watchdog , Prescaler = 1
   									// 0x00AF  to NOT disable the Watchdog, Prescaler = 64
   	SysCtrlRegs.SCSR = 0; 			// Watchdog generates a RESET	
   	SysCtrlRegs.PLLCR.bit.DIV = 10;	// Setup the Clock PLL to multiply by 5
    
   	SysCtrlRegs.HISPCP.all = 0x1; // Setup Highspeed Clock Prescaler to divide by 2
   	SysCtrlRegs.LOSPCP.all = 0x2; // Setup Lowspeed CLock Prescaler to divide by 4
      	
   	// Peripheral clock enables set for the selected peripherals.   
   	SysCtrlRegs.PCLKCR.bit.EVAENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.EVBENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SCIAENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SCIBENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.SPIENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.ECANENCLK=0;
   	SysCtrlRegs.PCLKCR.bit.ADCENCLK=0;
   	EDIS;
}

interrupt void cpu_timer0_isr(void)
{
    CpuTimer0.InterruptCount++;
   	// Serve the watchdog every Timer 0 interrupt
   	EALLOW;
	SysCtrlRegs.WDKEY = 0x55;		// Serve watchdog #1
	EDIS;

   // Acknowledge this interrupt to receive more interrupts from group 1
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
//===========================================================================
// End of SourceCode.
//===========================================================================