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peterl
Joined: 09 Oct 2009
Posts: 13
Location: SF,BG
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| 18F65j50 USB |
 Posted: Fri Aug 05, 2011 12:49 pm |
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Hi guys,
I am trying to make PC <> PIC communication with 18F65j50, but I can't set right frequency - 48MHz. The crystal wich is connected between RA6 and RA7 is 4MHZ. This is my code:
| Code: |
#include "18F65J50.h"
#FUSES NOWDT
#FUSES WDT128
#FUSES H4_SW
#FUSES NODEBUG
#FUSES NOXINST
#FUSES STVREN
#FUSES NOPROTECT
#FUSES FCMEN
#FUSES IESO
#FUSES MSSPMSK7
#FUSES RESERVED
#FUSES NOCPUDIV
#FUSES PLL5
#FUSES PMPDE
#use delay(clock=48000000)
//#include <pic18_usb.h>
//#include "usb_cdc.h"
void main ()
{
//usb_cdc_init();
//usb_init();
for(;;)
{
output_high(PIN_B0); //To see roughly what is frequency
delay_ms(1000);
output_low(PIN_B0);
delay_ms(1000);
}
}
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Led connected on PIN B0 flash too slowly. I think that frequency is still 4MHZ.
Thanks in advance. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Aug 05, 2011 2:03 pm |
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Post your compiler version, because there are differences in the fuses
between older versions and the current compiler version. |
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peterl
Joined: 09 Oct 2009
Posts: 13
Location: SF,BG
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| RE: |
| Posted: Fri Aug 05, 2011 2:21 pm |
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My compiler version is 4.084. I reduced code to this:
| Code: |
#include "18F65J50.h"
#FUSES H4_SW
#FUSES NOCPUDIV
#FUSES PLL1
#use delay(clock=4M)
void main ()
{
for(;;)
{
output_high(PIN_B0);
delay_ms(1000);
output_low(PIN_B0);
delay_ms(1000);
}
}
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The Led connected on PIN B0 is still flashing with exactly 1 second. Crystal is 4MHZ and capacitors is 20pf. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Aug 05, 2011 2:42 pm |
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Try this oscillator setup:
| Code: |
#include <18F65J50.h>
#fuses H4_SW, NOWDT
#use delay(clock=48M)
//============================
void main()
{
while(1);
} |
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peterl
Joined: 09 Oct 2009
Posts: 13
Location: SF,BG
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| RE: |
| Posted: Fri Aug 05, 2011 11:58 pm |
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Now interval is ~12 sec, PLL still not working.
C code:
| Code: |
#include "18F65J50.h"
#FUSES H4_SW
#FUSES NOWDT
#use delay(clock=48M)
void main ()
{
for(;;)
{
output_high(PIN_B0);
delay_ms(1000);
output_low(PIN_B0);
delay_ms(1000);
}
}
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ASM code:
| Code: |
CCS PCH C Compiler, Version 4.084 06-Aug-11 08:52
Filename: UPS-IARA.lst
ROM used: 114 bytes (0%)
Largest free fragment is 32646
RAM used: 6 (0%) at main() level
7 (0%) worst case
Stack: 1 locations
*
0000: GOTO 002C
.................... #include "18F65J50.h"
.................... //////// Standard Header file for the PIC18F65J50 device ////////////////
.................... #device PIC18F65J50
.................... #list
....................
....................
.................... #FUSES H4_SW
.................... #FUSES NOWDT
.................... #use delay(clock=48M)
0004: CLRF FEA
0006: MOVLW 07
0008: MOVWF FE9
000A: MOVF FEF,W
000C: BZ 002A
000E: MOVLW 0F
0010: MOVWF 01
0012: CLRF 00
0014: DECFSZ 00,F
0016: BRA 0014
0018: DECFSZ 01,F
001A: BRA 0012
001C: MOVLW 8F
001E: MOVWF 00
0020: DECFSZ 00,F
0022: BRA 0020
0024: NOP
0026: DECFSZ FEF,F
0028: BRA 000E
002A: RETLW 00
.................... void main ()
.................... {
002C: CLRF FF8
002E: BCF FD0.7
0030: CLRF FEA
0032: CLRF FE9
0034: BSF FC0.4
0036: MOVLW FF
0038: MOVWF FC1
003A: BCF FC0.4
003C: BCF FC2.6
003E: BCF FC2.7
0040: BSF FC0.4
0042: MOVWF FC2
0044: BCF FC0.4
0046: CLRF FD2
0048: CLRF FD1
.................... for(;;)
.................... {
.................... output_high(PIN_B0);
004A: BCF F93.0
004C: BSF F8A.0
.................... delay_ms(1000);
004E: MOVLW 04
0050: MOVWF 06
0052: MOVLW FA
0054: MOVWF 07
0056: RCALL 0004
0058: DECFSZ 06,F
005A: BRA 0052
.................... output_low(PIN_B0);
005C: BCF F93.0
005E: BCF F8A.0
.................... delay_ms(1000);
0060: MOVLW 04
0062: MOVWF 06
0064: MOVLW FA
0066: MOVWF 07
0068: RCALL 0004
006A: DECFSZ 06,F
006C: BRA 0064
.................... }
006E: BRA 004A
.................... }
0070: SLEEP
Configuration Fuses:
Word 1: F7AE NODEBUG NOXINST STVREN NOWDT NOPROTECT RESERVED NOCPUDIV PLL1
Word 2: FFC5 H4_SW WDT32768 FCMEN IESO RESERVED
Word 3: FD00 CCP2C1 MSSPMSK7 RESERVED PMPDE |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Aug 06, 2011 1:54 am |
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I'm staying up late so I might as well do this. One more thing needs to
be done. We need to set the PLLEN bit in the OSCTUNE register.
That's the "_SW" (software) part of it. See the 3 new lines in the
program below:
| Code: |
#include <18F65J50.h>
#fuses H4_SW, NOWDT
#use delay(clock=48M)
#byte OSCTUNE = getenv("SFR:OSCTUNE")
#bit PLLEN = OSCTUNE.6
//============================
void main()
{
PLLEN = 1;
while(1);
} |
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peterl
Joined: 09 Oct 2009
Posts: 13
Location: SF,BG
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| RE: |
| Posted: Sat Aug 06, 2011 4:19 am |
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Now it work  Thank you very much! |
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