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talhahs
Joined: 14 Oct 2010
Posts: 14
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| DC motors with L293D not running.. |
 Posted: Sun Jan 09, 2011 3:18 pm |
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Hi all, what could make this code from not running properly??
H bridge: L293D
2 DC motors connected to each side of L293D.
It waits for corresponding character from VB app before taking the action.
| Code: | #include "C:\Documents and Settings\Talha\My Documents\codes_CCS\VB_DC motor all directions\vb_motor_all directns.h"
#define LEFT_CONTROL_2A PIN_C0 //2A of L293D
#define LEFT_CONTROL_1A PIN_C1 //1A
#define LEFT_MOTOR PIN_C2 //1,2EN
#define LED PIN_D1
#define RIGHT_MOTOR PIN_D4 //3,4EN
#define RIGHT_CONTROL_4A PIN_D5 //4A
#define RIGHT_CONTROL_3A PIN_D6 //3A
void backward()
{ output_low(LEFT_CONTROL_1A);
output_high(LEFT_CONTROL_2A);
output_low(RIGHT_CONTROL_3A);
output_high(RIGHT_CONTROL_4A);
output_high(LEFT_MOTOR);
output_high(RIGHT_MOTOR);
}
void forward()
{ output_high(LEFT_CONTROL_1A);
output_low(LEFT_CONTROL_2A);
output_high(RIGHT_CONTROL_3A);
output_low(RIGHT_CONTROL_4A);
output_high(LEFT_MOTOR);
output_high(RIGHT_MOTOR);
}
void left()
{
output_high(LEFT_CONTROL_1A);
output_low(LEFT_CONTROL_2A);
output_high(RIGHT_CONTROL_4A);
output_low(RIGHT_CONTROL_3A);
output_high(LEFT_MOTOR);
output_high(RIGHT_MOTOR);
}
void right()
{
output_low(LEFT_CONTROL_1A);
output_high(LEFT_CONTROL_2A);
output_high(RIGHT_CONTROL_3A);
output_low(RIGHT_CONTROL_4A);
output_high(LEFT_MOTOR);
output_high(RIGHT_MOTOR);
}
void reset()
{
output_low(LED);
output_low(LEFT_CONTROL_1A);
output_low(LEFT_CONTROL_2A);
output_low(RIGHT_CONTROL_4A);
output_low(RIGHT_CONTROL_3A);
output_low(LEFT_MOTOR);
output_low(RIGHT_MOTOR);
delay_ms(100);
}
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
char cmd;
do{
if(kbhit())
{ cmd=getch();
output_high(LED);
switch (cmd)
{
case '0': //backward
printf("backward");
reset();
backward();
break;
case '1': //forward
printf("forward");
reset();
forward();
break;
case '2': //left
printf("left");
reset();
left();
break;
case '3': //right
printf("right");
reset();
right();
break;
case '4': //stop
printf("stop");
reset();
break;
}
}
} while(1) ;
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Jan 09, 2011 3:29 pm |
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Post this file:
| Quote: | | vb_motor_all directns.h |
We need to see the #include line for your PIC, the #fuses, #use delay(),
#use rs232(), etc.
Also post your CCS compiler version. |
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talhahs
Joined: 14 Oct 2010
Posts: 14
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| Posted: Mon Jan 10, 2011 2:05 am |
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Compiler version: PCWHD 4.104
| Code: | #include <16F877A.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES RESERVED //Used to set the reserved FUSE bits
#use delay(clock=12000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8) |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19496
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| Posted: Mon Jan 10, 2011 3:34 am |
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Glaring thing, you _must_ have 'errors' in your RS232 definition.
Generally, this should _always_ be used, unless _you_ are handling UART errors yourself.
In your case, not having it, will almost certainly hang the UART. Problem is the long delays. You have delays for the prints, and long timing delays in the code. If more than two characters arrive in any of these, the UART _will_ be hung....
Best Wishes |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Mon Jan 10, 2011 6:52 am |
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Do you have a MAX232 or equal on the serial I/O lines?
Serial cable is wired correctly?
Are you sure the VB program is sending an ASCII 0...4 ?
Have you tried hyperterminal or another terminal software package?
Try a loopback echo program to be sure..even have the PIC do it, before executing the case code...
I'd add a case 'else' statement to turn off the motors for invalid commands. |
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