pulsetest.c

avrlib.rar ,一个学习AVR处理器十分有用的函数库.

//*****************************************************************************
// File Name	: pulsetest.c
// 
// Title		: example usage of pulse library functions
// Revision		: 1.0
// Notes		:	
// Target MCU	: Atmel AVR series
// Editor Tabs	: 4
// 
// Revision History:
// When			Who			Description of change
// -----------	-----------	-----------------------
// 29-Apr-2003	pstang		Created the program
//*****************************************************************************

 
//----- Include Files ---------------------------------------------------------
#include <avr/io.h>			// include I/O definitions (port names, pin names, etc)
#include <avr/interrupt.h>	// include interrupt support

#include "global.h"		// include our global settings
#include "uart.h"		// include uart function library
#include "rprintf.h"	// include printf function library
#include "timer.h"		// include timer function library (timing, PWM, etc)
#include "pulse.h"		// include pulse output support

void pulseTest(void);

//----- Begin Code ------------------------------------------------------------
int main(void)
{
	// initialize our libraries
	// initialize the UART (serial port)
	uartInit();
	// set the baud rate of the UART for our debug/reporting output
	uartSetBaudRate(9600);
	// initialize the timer system
	timerInit();
	// initialize rprintf system
	rprintfInit(uartSendByte);
	
	// run the test
	pulseTest();

	return 0;
}

void pulseTest(void)
{
	u16 i;

	// print a little intro message so we know things are working
	rprintf("\r\nWelcome to the pulse library test program!\r\n");

	// set pulse pins as output
	// ** these are the correct pins for most processors, but not all **
	sbi(DDRD, 4);
	sbi(DDRD, 5);

	// initialize pulse library
	pulseInit();


	// do logarithmic frequency sweep
	rprintf("Running logarithmic frequency sweep...\r\n");
	for(i=1; i<4000; i+=((i/5)+1))
	{
		// set the output frequency
		pulseT1ASetFreq(i);
		// - set the number of pulses to output
		// - number of pulses will be set to make each
		//   frequency last 1/5 of a second in time
		// ** make sure we don't request zero pulses
		// ** because this means run indefinitely
		pulseT1ARun( (i/5)+1 );
		// print a debug message
		rprintf("Output Freq = %dHz\r\n", i);
		// wait for pulses to finish being output
		while(pulseT1ARemaining());
	}


	// do simultaneous pulse output on OC1A and OC1B pins with different frequencies
	rprintfCRLF();
	rprintf("Running simultaneous output on OC1A and OC1B with different frequencies\r\n");
	rprintf("OC1A will be at  50Hz for 2 seconds (100 pulses)\r\n");
	rprintf("OC1B will be at 175Hz for 4 seconds (700 pulses)\r\n");
	// start OC1A output
	pulseT1ASetFreq(50);
	pulseT1ARun(100);
	// start OC1B output
	pulseT1BSetFreq(175);
	pulseT1BRun(700);
	// enter a debug loop as long as there are pulses remaining
	while(pulseT1ARemaining() | pulseT1BRemaining())
	{
		rprintf("OC1A has %d pulses remaining, OC1B has %d pulses remaining\r\n", pulseT1ARemaining(), pulseT1BRemaining());
		timerPause(100);
	}
	rprintf("done!\r\n");

}