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Pulse Width Modulation

by: Jack

Pulse Width Modulation ECE3720


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Pulse Width Modulation lab report code
Class Notes
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This 4 page Class Notes was uploaded by Jack on Monday April 4, 2016. The Class Notes belongs to ECE3720 at University of California - Santa Cruz taught by Staff in Spring 2016. Since its upload, it has received 40 views. For similar materials see in Electrical Engineering at University of California - Santa Cruz.

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Date Created: 04/04/16
Pulse Width Modulation (PWM) OBJECTIVE:  This lab objective is to intea DC motor with a Pulse Width Modulator, and connect the DC motor to the TD62003 driver chip and write a program to control the speed of the DC motor. EQUIPMENT USED: Freescale PBMCUSLK Student Learning Kit; Current Driver Chip (TD62003) ; Small DC Motor. PROCEDURE:  Firstly, I wired the motor and current driver and connect is to the specified PWM channel. The pin of TD62003 driver chip is shown below(figure 1). Then design a C program (shown in the code section) to control the speed of the DC motor, My TA have given us a template of the C code, which is include all initialized value. The part we need do is to write the loop and the interrupts, which can display the various speed on the LCD, and can use the port T to change the speed of the DC motor. In addition, I start the motor at the following duty: 0 % ; 25 %; 50 %; 75 %; 100 %. Figure 1: pin connection of TD62003 driver chip PROBLEMS:  During the lab, The problems I ran into first was that wrong connection to the connector of the Motorola chip because the digital is not clear on it. So there was no happen when press the port T. Then I corrected the wire connection, but there was something wrong make the LCD display nothing. I checked the code, and found in the loop I write all case to LCDPutChar(), so It can not display the string like “100”. When this was corrected, the program began working properly. CONCLUSION:  From this lab, I learned how to use the PWM to control the speed of the DC motor. For PWM is also a deeper understanding of the role, These are really useful to help me study the course. Code: #include <hidef.h>      /* common defines and macros */ #include <mc9s12dt256.h>     /* derivative information */ //#include "pbs12dslk.h" #include "lcd.h" #pragma LINK_INFO DERIVATIVE "mc9s12dt256" volatile unsigned char duty = 50; void main(void)  { int j,k; DDRP = 0x02;   DDRJ = 0x00;  PERJ = 0x80; PPSJ = 0x00; PIEJ = 0x80; PIFJ = 0x80; PTP_PTP1 = 1; PWMPRCLK = 0x07; PWMSCLA = 0x0F; PWMCLK_PCLK1 = 1; PWMPOL_PPOL1 = 1; PWMCAE_CAE1 = 0; PWMPER1 = 100;// just use 100 here, for now dont bother about the time period PWME_PWME1 = 1; PWMDTY1 = duty; //equals 50 LCDInit(); LCDClearDisplay(); LCDPutChar('5'); LCDPutChar('0'); EnableInterrupts; while (1) {    LCDClearDisplay();    switch(duty)    {     case 0:LCDPutChar('0');break;     case 25:LCDPutString("25");break;     case 50:LCDPutString("50");break;     case 75:LCDPutString("75");break;     case 100:LCDPutString("100");break;        }    for (j=0;j<=1000;j++)       for (k=0;k<=1000;k++);    }   } void interrupt 24 PORTJ_ISR() { DisableInterrupts; duty = duty + 25; if(duty > 100) { duty = 0; } PWMDTY1 = duty; PIFJ = 0x80; EnableInterrupts; }


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