led.c

这是关DSP 2000的程序。主要是280**系列。

// TI File $Revision: /main/3 $
// Checkin $Date: December 3, 2004   13:39:29 $
//###########################################################################
//
// FILE:    Example_281xGpioToggle.c
//
// TITLE:   DSP280x Device GPIO toggle test program. 
//
// ASSUMPTIONS:
//
//    This program requires the DSP280x header files.  
//
//    ALL OF THE I/O'S TOGGLE IN THIS PROGRAM.  MAKE SURE
//    THIS WILL NOT DAMAGE YOUR HARDWARE BEFORE RUNNING THIS
//    EXAMPLE.
//
//    Monitor desired pins on an oscilloscope.
//
//    As supplied, this project is configured for "boot to SARAM" 
//    operation.  The 280x Boot Mode table is shown below.  
//    For information on configuring the boot mode of an eZdsp, 
//    please refer to the documentation included with the eZdsp,  
//
//       Boot      GPIO18     GPIO29    GPIO34
//       Mode      SPICLKA    SCITXDA
//                  SCITXB
//       -------------------------------------
//       Flash       1          1        1
//       SCI-A       1          1        0
//       SPI-A       1          0        1
//       I2C-A       1          0        0
//       ECAN-A      0          1        1        
//       SARAM       0          1        0  <- "boot to SARAM"
//       OTP         0          0        1
//       I/0         0          0        0 
//
//
// DESCRIPTION:
//
//     Three different examples are included. Select the example 
//     (data, set/clear or toggle) to execute before compiling using
//     the #define statements found at the top of the code.   
//
//
//     Toggle all of the GPIO PORT pins 
//        
//    The pins can be observed using Oscilloscope.  
// 
//
//###########################################################################
// $TI Release: DSP280x Header Files V1.60 $
// $Release Date: December 3, 2007 $
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File

// Select the example to compile in.  Only one example should be set as 1
// the rest should be set as 0.

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


void main(void)
{

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP280x_SysCtrl.c file.
   InitSysCtrl();
   
// Step 2. Initalize GPIO: 
// This example function is found in the DSP280x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example
 
// For this example use the following configuration:
   Gpio_select();	  

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts 
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.  
// This function is found in the DSP280x_PieCtrl.c file.
   InitPieCtrl();

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

// Initialize the PIE vector table with pointers to the shell Interrupt 
// Service Routines (ISR).  
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP280x_DefaultIsr.c.
// This function is found in DSP280x_PieVect.c.
   InitPieVectTable();

	
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP280x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
	
// Step 5. User specific code:
	
   led();


} 	

void delay_loop()
{
    short      i,j;
    for (i = 0; i < 10000; i++) {for(j=0;j<100;j++);}
}


void led(void)
{ 
   // Example 1:
   // Toggle I/Os using DATA registers

   for(;;)
   {   
       GpioDataRegs.GPADAT.all    =0x00800000; //扩展的LED发光二极管使用的是GPIO23，通过对这一位的控制
	                                           //可控制发光二极管两伙灭
         
       delay_loop();

       GpioDataRegs.GPADAT.all    =0x00000000; 
           
       delay_loop();	
    }
}




void Gpio_select(void)
{

   
    EALLOW;
	GpioCtrlRegs.GPAMUX1.all = 0x00000000;  // All GPIO
	GpioCtrlRegs.GPAMUX2.all = 0x00000000;  // All GPIO
	GpioCtrlRegs.GPAMUX1.all = 0x00000000;  // All GPIO
    GpioCtrlRegs.GPADIR.all = 0xFFFFFFFF;   // All outputs
    GpioCtrlRegs.GPBDIR.all = 0x0000000F;   // All outputs
    EDIS;
     
}     
//===========================================================================
// No more.
//===========================================================================