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Scottl
Joined: 21 Feb 2005
Posts: 25
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| Pic12F683 Rebooting over and over Please Help! |
 Posted: Mon Nov 12, 2007 12:57 am |
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Everything seems to be working fine but after receiving data then sending the response back out the PIC seems to reboot again and again! Worked fine for days on my breadboard!
Can anyone look at my code and tell me if they see any problem?
| Code: |
#include <12F683.h>
#device adc=8
#define TOUCH_DEVICE PIN_A2
#fuses NOWDT,INTRC_IO, NOCPD, NOPROTECT, NOMCLR, NOPUT, NOBROWNOUT, NOIESO, NOFCMEN
#use delay(clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_A0,rcv=PIN_A1,bits=8,STREAM=COM_A)
#use rs232(baud=9600,parity=N,xmit=PIN_A4,rcv=PIN_A5,bits=8,STREAM=COM_B)
#rom 0x7FF = {0x3400}
#include<1wire.c>
#include<ds1820.c>
#include <string.h>
void main()
{
float temperature;
char string_a[4];
char string_b[10];
int command;
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
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);
delay_ms(1000);
while(1) {
fgets(string_a, COM_A);
command = string_a[1];
if (command == 19)
{
temperature = read();
fprintf(COM_A, "I%3.1f\r", temperature);
} else {
fprintf(COM_B, string_a);
fgets(string_b, COM_B);
fprintf(COM_A, string_b);
}
}
}
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This project must ship out for beta testing today! Please help!
Thanks in advance,
Scott |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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Scottl
Joined: 21 Feb 2005
Posts: 25
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| Posted: Mon Nov 12, 2007 1:49 am |
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PCWH Compiler
IDE 3.43
PCB 3.205
PCM 3.205
PCH 3.205
char string_a[20];
char string_b[40];
Let me see if this works
Thanks,
Scott |
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Scottl
Joined: 21 Feb 2005
Posts: 25
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| Posted: Mon Nov 12, 2007 1:54 am |
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| No Luck! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Nov 12, 2007 2:40 am |
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Comment out lines of code to see where the problem is.
First comment out the line that calls the DS1820 driver. Put in a new
line that loads a constant value into the 'temperature' variable.
See if the 'reset' problem goes away.
| Quote: |
while(1) {
fgets(string_a, COM_A);
command = string_a[1];
if (command == 19)
{
// temperature = read(); // Comment out this line
temperature = 24.5; // Add this line
fprintf(COM_A, "I%3.1f\r", temperature);
} else {
fprintf(COM_B, string_a);
fgets(string_b, COM_B);
fprintf(COM_A, string_b);
}
}
}
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Also read this thread about random resets:
http://www.ccsinfo.com/forum/viewtopic.php?t=27638&start=4 |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Mon Nov 12, 2007 3:55 am |
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Sending data over RS232 means the RS232 driver will draw a relative large current, depending on circuit design this might have all kind of side effects. The links provided by PCM Programmer are a good starting point.
As a side note, compiler version v3.205 is an unstable version. The v3.2xx compiler releases became more or less stable at version 3.220. Though it is unlikely that your compiler version is causing the resets it is known to have other problems that you will run into sooner or later.
Hint: A free version of the PCB compiler is supplied with MPLAB. |
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Scottl
Joined: 21 Feb 2005
Posts: 25
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| Posted: Mon Nov 12, 2007 8:46 am |
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I have tried your method and tested the following and it works! That is without the second port.
| Code: |
while(1) {
fgets(string_a, COM_A);
command = string_a[1];
if (command == 19)
{
// temperature = read(); // Comment out this line
temperature = 24.5; // Add this line
fprintf(COM_A, "I%3.1f\r", temperature);
} else {
//fprintf(COM_B, string_a);
//fgets(string_b, COM_B);
//fprintf(COM_A, string_b);
fprintf(COM_A, "Test\r");
}
}
} |
It is working but as soon as I try to use the second 232 port it stops working.
Thanks,
Scott |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Nov 12, 2007 12:30 pm |
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You're using two software UARTs. Each line of code that uses a soft
UART has to be fully completed before the program advances to the
next line of code.
When your program is sending RS232 characters with this line,
| Quote: | | fprintf(COM_A, "I%3.1f\r", temperature); |
then it can't advance to this line until it's done:
| Quote: | | fgets(string_b, COM_B); |
But, what if characters are coming into COM_B during that time ?
One or more of the characters will be missed. You also may get
garbled data, since the fgets() line may start execution in the middle
of a character. A data bit could be interpreted as a "start" bit.
(Because the start bit was missed while the fprintf() was in progress). |
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Scottl
Joined: 21 Feb 2005
Posts: 25
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| Posted: Mon Nov 12, 2007 3:57 pm |
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The user will request data from either ibutton or equipment on 232 port two. The handhelds should never connect to both at the same time!
Well I will have to take that back if it can be done it will be done by some user!
Maybe adding a small delay?
Scott |
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