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hwstar
Joined: 15 May 2010
Posts: 10
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| questions about pic16f1933 and 4X PLL |
 Posted: Sat May 15, 2010 5:29 pm |
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The following gets a compile error on PCM (linux version):
| Code: |
#include <16F1933.h>
#use delay(crystal=4.9152Mhz, clock=19.6608Mhz)
main()
{
for(;;){
}
}
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Output:
| Code: |
CCS PCM C Compiler
.
.
.
Compiling: test.c
1 Errors, 0 Warnings, Time: 1 Seconds
Error[99] test.c 2 : Option invalid No PLL
1 Errors, 0 Warnings.
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Compiler version: PCM compiler version 4.105;2/26/2010
The pic 16F1933 part has a selectable 4X PLL!
Also when I modify test.c as follows
| Code: |
#include <16F1933.h>
#use delay(crystal=4.9152Mhz)
main()
{
for(;;){
}
}
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It compiles just fine, however, looking at the list file, the PLL bit in the second config word is being turned on!:
| Code: |
Configuration Fuses:
Word 1: 3FC2 HS NOWDT PUT NOPROTECT MCLR NOCPD BROWNOUT IESO FCMEN NOCLKOUT
Word 2: 1733 NOWRT NOVCAP PLL STVREN BORV19 NOLVP NODEBUG |
Questions:
1. Why does the compiler think that the 16F1933 part doesn't have a PLL?
2. Why is the PLL bit being turned on by the compiler?
Steve |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat May 15, 2010 10:07 pm |
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I don't have the Linux version so I can't test it explicitly. Try telling the
compiler what to do, in the most simple, direct terms. Give it the HS fuse
to run the 4.9152 MHz crystal. Then enable the PLL circuit with the PLL
fuse. Then tell it what the final oscillator frequency will be, in the #use
delay() statement. See if this works:
| Code: |
#include <16F1933.H>
#fuses HS, PLL, NOWDT, PUT, NOLVP
#use delay(clock=19660800)
//=================================
void main()
{
while(1);
} |
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hwstar
Joined: 15 May 2010
Posts: 10
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| 16F1933 and 4x PLL |
| Posted: Sun May 16, 2010 11:37 am |
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After making a small change to the suggested test program, it appears to be setting the fuses correctly. The linux version is case sensitive on file names and needs a lower case h for the header files.:
| Code: |
#include <16F1933.h>
#fuses HS, PLL, NOWDT, PUT, NOLVP
#use delay(clock=19660800)
//=================================
void main()
{
while(1);
}
Fuse list from test.lst file:
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| Code: |
Configuration Fuses:
Word 1: 3FC2 HS NOWDT PUT NOPROTECT MCLR NOCPD BROWNOUT IESO FCMEN NOCLKOUT
Word 2: 1733 NOWRT NOVCAP PLL STVREN BORV19 NOLVP NODEBUG
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