dsp28_ev.c

C语言编写的DSP例程,是一个跑马灯程序 希望对初学者有用

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Ev.c
//
// TITLE:	DSP28 Event Manager Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release
//  0.56| 20 May 2002 | L.H. | No change
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"

//---------------------------------------------------------------------------
// InitEv: 
//---------------------------------------------------------------------------
// This function initializes to a known state.
//
void InitEv(void)
{
 // Initialize EVA Timer 1:
    // Setup Timer 1 Registers (EV A)
    EvaRegs.GPTCONA.all = 0;
   
    // Set the Period for the GP timer 1 to 0x2000;
    EvaRegs.T1PR = 3750;       // Period=0.0001s=0.1ms adc fad=10kHz/s  internal oscil frequency=75MHz/2
    EvaRegs.T1CMPR = 0x0000;     // Compare Reg
   
    // Enable Period interrupt bits for GP timer 1
    // Count up, x1, internal clk, enable compare, use own period
    
//    EvaRegs.EVAIMRA.bit.T1PINT = 1;
//    EvaRegs.EVAIFRA.bit.T1PINT = 1;

    // Clear the counter for GP timer 1
    EvaRegs.T1CNT = 0x0000;
    EvaRegs.T1CON.all = 0x1142;//连续增模式，2分频=37.5MHz，自身使能，使能定时器，内部时钟，当计数器为零使能定时器操作，选用自身周期寄存器

    // Start EVA ADC Conversion on timer 1 Period interrupt
    EvaRegs.GPTCONA.bit.T1TOADC = 2;

}	
	
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// No more.
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