main.c

This directory contains a code example that demonstrates the functionality of the general purpose t

/*****************************************************************************************/
//
// Name: 	BF561 EZ-KIT General Purpose Timers Example 	
//
/*****************************************************************************************

(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.

File Name:				main.c

Date Modified:			10/28/03		PK		Rev 1.0

Software:       		VisualDSP++3.5

Hardware:				BF561 EZ-KIT Board	Rev 1.0

Hardware Setup: 		On the EZ-KIT expansion interface J2, connect a wire
						across pins 57 and 58 (PF0 and PF1). This enables a
						timer loopback.

Purpose:				Demonstrates the functionality of the general purpose
						timers on the ADSP-BF561. Timer0 is configured as a
						PWM output and Timer1 is a pulse width capture input.
						The output of Timer0 is looped back to Timer1 which 
						measures the pulse width and period of the incoming
						waveform. An interrupt is generated at the end of
						each period and a period counter is incremented in
						an ISR. After 25 periods have expired, execution
						is halted.
				
******************************************************************************************/
					
#include "cdefBF561.h"
#include "ccblkfn.h"
#include <stdio.h>
#include <sys\exception.h>
#include "main.h"

// Timer Interrupt Handler Prototype

EX_INTERRUPT_HANDLER(Timer1_ISR);

char period_count;

// User program

void main() {
	period_count = 0;
	// unblock Core B if dual core operation is desired	
#ifndef RUN_ON_SINGLE_CORE
	*pSICA_SYSCR &= 0xFFDF; // clear bit 5 to unlock  
#endif

	// set Clocks
	Set_PLL( (short)(CORECLK/CLKIN), (short)(CORECLK/SYSCLK));			// sets Core clock to 600MHz (= 18 x 33MHz) and SCLK to 120MHz (=600Mhz / 5)  

	// initialise SDRAM
	InitSDRAM();

	// assign ISR to interrupt vector
	
	register_handler(ik_ivg10, Timer1_ISR);		// Timer0 ISR -> IVG 10

	// enable Timer1 interrupt
	
	*pSICA_IMASK1 = 0x10;

	// Initialize Timer0 for PWM Output mode
	
	*pTIMER0_CONFIG		= 0x9;
	asm("ssync;");
	*pTIMER0_PERIOD		= 0x00800000;
	*pTIMER0_WIDTH		= 0x00400000;
	
	// Initialize Timer1 for Pulse Width Count and Capture mode
	
	*pTIMER1_CONFIG		= 0x1A;
	asm("ssync;");
	
	// Enable Timers 0 and 1
	
	*pTMRS8_ENABLE = 0x0003;
	
	while(period_count <= 25)
		asm("nop;");
	
}		// main

EX_INTERRUPT_HANDLER(Timer1_ISR)
{
	// Clear Timer1 Interrupt
	
	*pTMRS8_STATUS = 0x0002;	
	
	// Increment Period Counter
	
	period_count +=1;
	
}