exint.c

TMS320F2808 DSP芯片的接口控制源码

// TI File $Revision: /main/4 $
// Checkin $Date: December 3, 2004   13:54:58 $
//###########################################################################
//
// FILE:    Example_280xCpuTimer.c
//
// TITLE:   DSP280x Device Getting Started Program.
//
// ASSUMPTIONS:
//
//    This program requires the DSP280x header files.  
//
//    Other then boot mode configuration, no other hardware configuration
//    is required.   
//
//
//    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:
//
//    This program sets up GPIO3 as XINT1 and GPIO4 as XINT2. 
//
//    XINT1 input is synched to SYSCLKOUT
//    XINT2 has a long qualification - 6 samples at 510*SYSCLKOUT each.
//
//    GPIO34 will go high outside of the interrupts and low within the 
//    interrupts. This signal can be monitored on a scope.
//
//    Each interrupt is fired in sequence - XINT1 first and then XINT2 
//
//
//    Watch Variables:
//       Xint1Count for the number of times through XINT1 interrupt
//       Xint2Count for the number of times through XINT2 interrupt
//       LoopCount for the number of times through the idle loop
//
//###########################################################################
// $TI Release: DSP280x V1.30 $
// $Release Date: February 10, 2006 $
//###########################################################################


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

// Prototype statements for functions found within this file.
interrupt void cpu_timer2_isr(void);
interrupt void xint1_isr(void);
interrupt void xint2_isr(void);

const	Uint16	LedCode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF};
const	Uint16	Light[]  ={0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0x7F };
void   	SendData(Uint16	num,Uint16	data);
Uint16	LedCount = 0;
Uint16	LedCount1 = 0;
Uint16	TCounter = 0;
Uint16	ExtIntCounter =5; 
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();  

	SetCs(1);
	SetCs(0);

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

// Initialize the 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();
   InitPieCtrl();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.  
   EALLOW;  // This is needed to write to EALLOW protected registers
   PieVectTable.XINT1 = &xint1_isr;
   PieVectTable.XINT2 = &xint2_isr;
   PieVectTable.TINT2 = &cpu_timer2_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP280x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   InitCpuTimers();   // For this example, only initialize the Cpu Timers

// Configure CPU-Timer 2 to interrupt every second:
// 100MHz CPU Freq, 50ms  Period (in uSeconds)
   ConfigCpuTimer(&CpuTimer2, 100, 10000);

// Step 5. User specific code, enable interrupts:

// Enable XINT1 and XINT2 in the PIE: Group 1 interrupt 4 & 5
// Enable INT1 which is connected to WAKEINT:
   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;          // Enable the PIE block
   PieCtrlRegs.PIEIER1.bit.INTx4 = 1;          // Enable PIE Gropu 1 INT4
   PieCtrlRegs.PIEIER1.bit.INTx5 = 1;          // Enable PIE Gropu 1 INT5   
   IER |= M_INT1;                              // Enable CPU INT1

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

   EnableInterrupts();
// 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):

	SendData(0,0xFF);
	SendData(1,0xFF);
	
   	StartCpuTimer2();
	
	while(1)
	{
	}
} 


interrupt void cpu_timer2_isr(void)
{
	TCounter++;
	if	(TCounter>2*ExtIntCounter)
	{
		TCounter = 0;
		SendData(0,Light[LedCount1]);
		LedCount1++;
   		if (LedCount1>7)   LedCount1 = 0;
	}	
}

interrupt void xint1_isr(void)
{
	ExtIntCounter = 1;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
interrupt void xint2_isr(void)
{
	ExtIntCounter = 5;
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

//===========================================================================
// No more.
//===========================================================================