This is the error I'm getting. I'm using CodeWarrior IDE version5.9.0, build 5294. I'm in an online class and this is for a lab to control a dc motor through PWM in a closed loop using an optical interrupter switch. I told my instructor I was having a problem and he sent me this code which is complete and should work, but now I'm having a linking error and he's ignoring my e-mails. I'm kind of a noob at CodeWarrior, but I think this should be an easy fix I think I just need to point these functions to the correct files(?). I just have no idea how to do it. Thanks!
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// encoder_period.c
// Display motor period measured by HC12 Timer to Hyperterminal
// Wytec HC12 Dev Board (24MHz eclk) using Codewarrior-
// Input: Port T pin 0 (PT0) - connects to Opto-interrupter output
// Open J24 to disconnect PT0 from 7-segment display
// Additional connections and ports as in motor_test.c above
// This program will not download to flash or start with the motor connected
#include <hidef.h>/* common defines and macros */
#include <mc9s12dg256.h>/* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"
#include "TERMIO.h"
#include <stdio.h>
//RAM variables
int rawvalue=0;// unreduced timer period count
void init_PLL();
void init_timer();
unsigned int get_period();
void motor_1speed(char);
void delay(int);
/************main************/
void main(){
init_PLL();// added - initialize PLL for 24 MHz CPU clock
EnableInterrupts;
HILO1_init();
TERMIO_Init();
SCI0BDL=156;// added to slow down baudrate to 9600 for hardware
init_timer();// configures input capture timer ch.0:...
// ... set main timer period = 5.33us
motor_1speed(133);//run motor at duty cycle passed into fcn as parameter
puts("started");//wait until this is displayed, then connect motor lead
for(;;){
rawvalue=get_period();//returns timer period count between 2 pulses
printf("period counts = %d\n\r",rawvalue);// send rawvalue to monitor
printf("RPM = %d\n\r",(rawvalue/80)*60);
delay(1000);//wait 1 sec. for rawvalue to be sent to monitor
}/* keep on */
}
void init_timer(){//configures input capture timer: main timer period = 5.33us
TSCR1=0x90;
TSCR2=0x06;
TIOS&=~0x01;
TCTL4=0x01;
}
unsigned int get_period(){//measures period between 2 timer ch. 0 input pulses
int event1;
int period;
TFLG1|=0x01;
while(!(TFLG1&0x01)){}
event1=TC0;
while(!(TFLG1&0x01)){}
period=TC0+event1;
return period;
}
void motor_1speed(char speed){ //init Port B; run motor at single speed (dutycounts)
DDRB|=0x03;
PORTB=0x01;
PWMCLK=0x01;
PWMSCLA=0x03;
PWMPOL=0x01;
PWMPER0=200;
PWMDTY0=speed;
PWME|=0x01;
}
void init_PLL(){// initializes phase-locked loop (hardware)for 24Mhz CPU clock
asm(sei);// for running board standalone w/out Codewarrior
CLKSEL&=~0x80;
PLLCTL|=0x40;
SYNR=0x05;
REFDV=0x01;
while((CRGFLG&0x08)==0){// wait here for lock
CRGFLG|=0x08;
}
CLKSEL|=0x80;
asm(cli);
} // use this function as is
void delay(int del){// delay for 'del' msecs
int i,j;
for(i=0;i<del;i++)
for(j=0;j<2000;j++);
}
/******* end of file **********/
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