example_28xgpio.c

dsp的一些例程

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	Example_28xGpio.c
//
// TITLE:	DSP28 Device GPIO test porgram. 
//		All the GPIO PORT pins IOs will toggle forever in an indefinite
//		loop
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.56| 06 May 2002 | S.S. | EzDSP Alpha Release
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################



#include "DSP28_Device.h"
#include "DSP28_Globalprototypes.h"

// Prototype statements for functions found within this file.
// interrupt void ISRTimer2(void);
void delay_loop(void);
void Gpio_select(void);

unsigned int var1 = 0;
unsigned int var2 = 0;
unsigned int var3 = 0;
unsigned int var4 = 0;
unsigned int var5 = 0;

void main(void)
{

// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
        // This function is found in the DSP28_SysCtrl.c file.
	InitSysCtrl();

// Step 2. Select GPIO for the device or for the specific application:
        // This function is found in the DSP28_Gpio.c file.
//	InitGpio(); skip this as this is for GPIO test

// Step 3. Initialize PIE vector table:
	// The PIE vector table is initialized with pointers to shell Interrupt 
        // Service Routines (ISR).  The shell routines are found in DSP28_DefaultIsr.c.
	// Insert user specific ISR code in the appropriate shell ISR routine in 
        // the DSP28_DefaultIsr.c file.

	// Disable and clear all CPU interrupts:
	DINT;
	IER = 0x0000;
	IFR = 0x0000;

	// Initialize Pie Control Registers To Default State:
        // This function is found in the DSP28_PieCtrl.c file.
	InitPieCtrl();

	// Initialize the PIE Vector Table To a Known State:
        // This function is found in DSP28_PieVect.c.
	// This function populates the PIE vector table with pointers
    // to the shell ISR functions found in DSP28_DefaultIsr.c.
	InitPieVectTable();	
	
// Step 4. Initialize all the Device Peripherals to a known state:
	// This function is found in DSP28_InitPeripherals.c
    // InitPeripherals(); skip this for GPIO tests
	
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
	
// Run GPIO test
	var1= 0x0000;		// sets GPIO Muxs as I/Os
	var2= 0xFFFF;		// sets GPIO DIR as outputs
	var3= 0x0000;		// sets the Input qualifier values
	
	Gpio_select();	
	// Toggle I/Os  using DATA register for ever
	while(1)
	{    
	GpioDataRegs.GPADAT.all    =0xAAAA;   
	GpioDataRegs.GPBDAT.all    =0xAAAA;     
	GpioDataRegs.GPDDAT.all    =0x0022;    
	GpioDataRegs.GPEDAT.all    =0x0002; 
	GpioDataRegs.GPFDAT.all    =0xAAAA;    
	GpioDataRegs.GPGDAT.all    =0x0020; 	   			  
    delay_loop();
    
    GpioDataRegs.GPADAT.all    =0x5555;     			
	GpioDataRegs.GPBDAT.all    =0x5555;     
	GpioDataRegs.GPDDAT.all    =0x0041;    // Four I/Os only
	GpioDataRegs.GPEDAT.all    =0x0005;    // ThreeI/Os only
	GpioDataRegs.GPFDAT.all    =0x5555;    
	GpioDataRegs.GPGDAT.all    =0x0010;    // Two  I/Os only
    delay_loop();	
    }
	
//	EALLOW;	// This is needed to write to EALLOW protected registers
//	PieVectTable.TINT2 = &ISRTimer2;
//	EDIS;   // This is needed to disable write to EALLOW protected registers
    

    // Enable INT14 which is connected to CPU-Timer 2:
//	IER |= M_INT14;

    // Enable global Interrupts and higher priority real-time debug events:
	
//	EINT;   // Enable Global interrupt INTM
//	ERTM;	// Enable Global realtime interrupt DBGM

// Step 6. IDLE loop. Just sit and loop forever (optional):	
//	for(;;);

} 	


// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:	
	// If local ISRs are used, reassign vector addresses in vector table as
    // shown in Step 5
/*
// Interrupt function template
interrupt void ISRTimer2(void)
{
	
}
*/


void delay_loop()
{
    short      i;
    for (i = 0; i < 1000; i++) {}
}

void Gpio_select(void)
{
	 EALLOW;
	 
	GpioMuxRegs.GPAMUX.all=var1;
    GpioMuxRegs.GPBMUX.all=var1;   
    GpioMuxRegs.GPDMUX.all=var1;
    GpioMuxRegs.GPFMUX.all=var1;		 
    GpioMuxRegs.GPEMUX.all=var1; 
    GpioMuxRegs.GPGMUX.all=var1;
										
    GpioMuxRegs.GPADIR.all=var2;		// GPIO PORTs  as output
    GpioMuxRegs.GPBDIR.all=var2;   		// GPIO DIR select GPIOs as output 
    GpioMuxRegs.GPDDIR.all=var2;
    GpioMuxRegs.GPEDIR.all=var2;		
    GpioMuxRegs.GPFDIR.all=var2; 
    GpioMuxRegs.GPGDIR.all=var2;

    GpioMuxRegs.GPAQUAL.all=var3;  		// Set GPIO input qualifier values
    GpioMuxRegs.GPBQUAL.all=var3;   
    GpioMuxRegs.GPDQUAL.all=var3;
    GpioMuxRegs.GPEQUAL.all=var3;
 
    EDIS;
     
}     
//===========================================================================
// No more.
//===========================================================================