Here is my latest code:
- CODE: SELECT_ALL_CODE
//
// Author : Muhammad Abdullah bin Rosdi
// Project : Assignment Deposit Machine
// Project description : Interface SK40C with MD10C to control 2 DC motor
// in Sign-magnitude mode using PIC16F877A
// Compiler :
// Notes :
//
//Connection Summary:
// RC0-connected to DIR of right motor
// RC1-connected to PWM of right motor
// RC2-connected to PWM of left motor
// RC3-connected to DIR of left motor
//==============================================================================================
// include
//==============================================================================================
#include <pic.h>
// define
//==============================================================================================
// Oscillator Frequency.
//#define _XTAL_FREQ 20000000
// UART baud rate
//#define UART_BAUD 9600
// SK40C switches
#define SW1 RB0
#define SW2 RB1
// MD10C ports
#define MD10C_R_DIR RC0
#define SPEEDR CCPR2L
#define SPEEDF CCPR1L
#define MD10C_F_DIR RC3
// SK40C LED
#define LED1 RB6
#define LED2 RB7
/*******************************************************************************
* DEVICE CONFIGURATION WORDS *
*******************************************************************************/
// configuration
//==========================================================================
__CONFIG ( 0x3F32 ); //configuration for the microcontroller
// function prototype
//===========================================================================================
void delay(unsigned long data); //delay function
unsigned char uart_rec(void); //uart function (receive)
void uart_send(unsigned char data); //uart function (send)
void uart_str(const char *s); //uart function(string)
// main function
//===========================================================================================
void main(void)
{
//unsigned int received;
unsigned int send;
unsigned int a;
unsigned int b=0;
unsigned int c=1;
//set I/O input output
TRISB = 0b00000011; //configure PORTB I/O direction
TRISC = 0b10000000; //configure PORTC I/O direction
TRISD = 0b00000000; //configure PORTD I/O direction
//setup ADC
ADCON1 = 0b00000110; //set ADx pin digital I/O
//initialize UART
SPBRG = 129; // Configure the baud rate. Set to 9600
BRGH=1; //baud rate high speed option
TXEN=1; //enable transmission
TX9 =0; //8-bit transmission
RX9 =0; //8-bit reception
CREN=1; //enable reception
SPEN=1; //enable serial port
// initialize PWM
// Setup PWM
// Setting PWM frequency = 4.88khz
// using PIC16F877A with 20MHz Crystal
PR2 = 0xFF;
T2CKPS1 = 0;
T2CKPS0 = 1; // Timer 2 prescale = 4.
SPEEDF = 0;
SPEEDR = 0;
TMR2ON = 1; // Turn on Timer 2.
// Configure CCP1 module to operate in PWM mode.
CCP1M3 = 1;
CCP1M2 = 1;
// Configure CCP2 module to operate in PWM mode.
CCP2M3 = 1;
CCP2M2 = 1;
LED1=0;
LED2=0;
while(1)
{
//led1 for open, led2 for close
//sw1 for stop motor in open, sw2 for stop motor in close.
a = uart_rec();
if (SW1==1)
{
if (a == '0')//close front door
{
MD10C_F_DIR = 0;
SPEEDF = 220;
LED2 =1;
}
else if (a =='1') //open front door02
{
MD10C_F_DIR = 1;
SPEEDF = 220;
LED1 = 1;
}
else //if (a=='2')//open back door
{
MD10C_R_DIR = 1;
SPEEDR = 220;
LED1 = 1;
LED2 = 0;
delay(900000);
MD10C_R_DIR =0;
SPEEDR = 220;
LED1 = 0;
LED2 = 1;
delay(900000);
SPEEDR = 0;
}
}
else if (SW1==0) //stop motor
{
SPEEDF = 0;
LED1=0;
LED2=0;
uart_send(c);
}
}while(1) continue;
}
// Simple delay function
//=============================================================================================
void delay(unsigned long data)
{
for( ;data>0;data-=1);
}
// UART send function
//=============================================================================================
void uart_send(unsigned char data) //function to send out a byte via uart
{
while(TXIF==0); //wait for previous data to finish send out
TXREG=data; //send new data
}
// UART receive function
//=============================================================================================
unsigned char uart_rec(void) //receive uart value
{
unsigned char rec_data;
while(RCIF==0); //wait for data
rec_data = RCREG;
return rec_data; //return the data received
}
// UART string function
//=============================================================================================
void uart_str(const char *s)
{
while(*s)uart_send(*s++);
}
The task I want to do is simple, but yet I can't get it done. Using the above code, I can get the motor running when I send "1", "2" or "0", but whenver I press SW1, the motor won't stop.
I'm suspecting the problem is with my code. Can anyone suggest me on what to do?
