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TJDesign
Joined: 20 Dec 2003
Posts: 1
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| 12C671 OTP vs 12F675 Flash |
 Posted: Sat Dec 20, 2003 4:54 pm |
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I'm having trouble making the 12C671 function properly, while the same code works fine with the 12F675 Flash part. I include either the Flash or the OTP info and comment out the other one to select which part to program. The programmer and the compiler both use the 12C671.h file for 12C671 and the 12LC671 which is what we are using.
I don't think that there is a problem with the Fuses but maybe there is. The two lines below are the possible fuses for the part.
//////// Fuses: LP,XT,HS,RC,NOWDT,WDT,NOPUT,PUT,PROTECT,PROTECT_75%
//////// Fuses: PROTECT_50%,NOPROTECT,MCLR,INTRC,NOMCLR,INTRC_IO,RC_IO
The part is programming with no errors and that when you power it up you can't get any output from the part. You can see that the part is running because the clock out signal is at 1 MHz.
Here is the .c file
| Code: |
// Note: use this include for PIC12C671 parts(note that these are commented out if programming a Flash part):
#include <12C671.h>
#use delay(clock=4000000)
#fuses INTRC,NOMCLR,NOPROTECT,NOPUT,NOWDT
// Note: use these include lines for programming PIC12F675 Flash parts: (note that these are commented out if programming an OTP part)
//#include <12F675.h>
//#use delay(clock=4000000)
//#fuses INTRC,NOWDT,NOMCLR,NOPROTECT,NOPUT,NOCPD,NOBROWNOUT
//
//compiled with PCW C Compiler Revision 1.3
//
int x = 0;
int y;
int rtcc_var = 216;
int dec_count = 0;
long total = 0;
long zero_point = 0;
long high_point = 0;
long count, half;
long lastcount = 0;
long avg;
int lookup;
int timer_value = 0;
short decrease = 0;
BYTE CONST table_one [256] = {0,0,1,1,2,2,3,3,4,4,
/*10*/5,5,6,6,7,7,8,8,9,9,
/*20*/10,11,12,13,14,15,16,17,18,19,/*30 */20,20,20,21,21,21,22,22,22,23,
/*40*/23,23,24,24,25,25,26,26,27,27,/*50 */28,28,29,29,30,30,31,31,32,32,
/*60*/33,34,34,35,36,36,37,37,38,38,/*70 */39,39,40,40,41,42,42,43,43,44,
/*80*/45,45,46,46,47,48,48,49,49,49,/*90 */50,50,50,51,51,52,52,53,53,54,
/*100*/54,55,55,56,56,57,57,58,58,59,/*110*/59,60,60,60,61,61,62,62,63,63,
/*120*/64,64,65,65,66,66,67,67,68,68,/*130*/69,69,70,70,70,71,71,72,72,73,
/*140*/73,74,74,75,75,76,76,77,77,78,/*150*/78,79,79,80,80,80,80,80,81,81,
/*160*/81,81,81,82,82,82,82,82,83,83,/*170*/83,83,83,84,84,84,84,84,85,85,
/*180*/85,85,85,86,86,86,86,86,87,87,/*190*/87,87,87,88,88,88,88,88,88,88,
/*200*/89,89,89,89,89,89,89,89,90,90,/*210*/90,90,90,91,91,91,92,92,93,93,
/*220*/93,94,94,95,95,95,96,96,97,97,/*230*/98,98,98,99,99,100,100,100,100,100,
/*240*/100,100,100,100,100,100,100,100,100,100,/*250*/100,100,100,100,100,100};
#priority EXT,RTCC
#int_RTCC
RTCC_isr() {
count++;
set_rtcc(rtcc_var);
}
#int_EXT
EXT_isr() { // got here from hardware interrupt from the Novatek processor
if (bit_test(timer_value,x)) { // test bit x of timer_value
output_high(PIN_A0); //if bit x=1 then output high to Novatek processor
} else {
output_low(PIN_A0); //else if bit x=0 then output low to Novtek processor
}
++x; // increment x
if (x==8) { // if x=8 then data has been sent
x = 0; // set x=0
}
}
void main() {
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_counters(RTCC_INTERNAL,RTCC_DIV_1);
// only needed for flash parts.
//setup_comparator(NC_NC_NC_NC);
set_tris_a(0b00000110);
port_a_pullups(true);
enable_interrupts(global);
ext_int_edge(L_TO_H);
output_low(PIN_A0);
delay_ms(500);
// get zero point
if (!input(PIN_A1)) { // if input is low wait for high
while (!input(PIN_A1)) {}
} else { // if input is high wait for low and then wait until it flips high
while (input(PIN_A1)) {}
while (!input(PIN_A1)) {}
}
count = 0;
set_rtcc(rtcc_var); // restart the counting process
enable_interrupts(INT_RTCC);
while (input(PIN_A1)) {}
disable_interrupts(INT_RTCC);
zero_point = count;
zero_point = (zero_point - 7) * 2;
enable_interrupts(INT_EXT);
while (true) { // loop forever
while (x==0) { // if external interrupt has triggered (x>0) wait until data is sent and x=0 again
// we don't want the data being sent to change in the middle of sending it
avg = 0;
if (!input(PIN_A1)) { // if input is low, wait for high
while (!input(PIN_A1)) {}
} else { // now that input is high, wait for low, then high again
while (input(PIN_A1)) {}
while (!input(PIN_A1)) {}
}
count = 0;
set_rtcc(rtcc_var);
enable_interrupts(INT_RTCC);
while (input(PIN_A1)) { // while input is high start counter
if (x > 0) {break;}
}
disable_interrupts(INT_RTCC);
if (x > 0) {break;}
count = count * 2;
avg = (count + lastcount) / 2;
high_point = zero_point - 256;
if (avg >= zero_point) {
timer_value = 0;
} else if (avg <= high_point) {
timer_value = 100;
} else {
lookup = zero_point - avg; // now get the table output value
timer_value = table_one [lookup];
}
lastcount = count; // keep old count for average
} // while x==0
} // while true
} // main
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jspencer
Joined: 22 Dec 2003
Posts: 57
Location: Boise, ID USA
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| Helping on project |
| Posted: Mon Dec 22, 2003 10:43 am |
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I am working on this project with TJDesign. We think that the problem either lies in the Fuses or the setup of the part. The other thing that I've seen a few posts on is that the file names are fairly long and we may need to put the project in a directory closer to the root.
If someone can pick something out that looks wrong in the fuses or part setup that would be great  . We've been through it several times and tried different combinations of fuses and various other things with no luck  . The part appears to be working, because the clock out is running at 1 MHz, but we just can't get any output from the part.
We don't want to try to program anymore parts without getting a fresh pair of eyes to look over the code and see if something stand out. We've already gone through a half dozen parts and that starts adding up after a while.
Any help, thoughts or ideas would be great  .
Thanks,
jspencer |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Dec 22, 2003 11:22 am |
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| Quote: | | //compiled with PCW C Compiler Revision 1.3 |
What's the version of your compiler ? The version given above
is likely the IDE version. The compiler version can be found at
the top of the .LST file. |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Mon Dec 22, 2003 1:36 pm |
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Have checked the code and it seems Ok. Regarding the #fuses configurations, what I would do to test it is to toggle a pin and watch it with a scope if the program pass by the points I expected, these is a good aproach to the real world.
| Quote: |
The part appears to be working, because the clock out is running at 1 MHz, but we just can't get any output from the part.
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This do not warranty that the program is running, just a sample of the clock activity.
regards,
Humberto |
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jspencer
Joined: 22 Dec 2003
Posts: 57
Location: Boise, ID USA
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| Compiler Version |
| Posted: Mon Dec 22, 2003 5:32 pm |
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The Compiler Version is:
PCW V3.176
IDE V3.24
I may have found an issue in my code. I was working on it today just using a 12F675 and on an older part the program worked fine. On new parts(3) that we just purchased, it wouldn't work. I stripped the code down and just did some basic toggling of the output and it worked fine on the new parts. So I just need to add sections of the code back in until it quits working and hopefully I'll find what I'm looking for. |
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