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Geps
Joined: 05 Jul 2010
Posts: 129
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| Firmware Won't Start Up After Power Cycling |
 Posted: Wed May 16, 2012 3:31 am |
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Hi,
I've got a bizarre problem that I'm at a loss to explain.
I have the following program that when programmed to the PIC works as intended. I then turn the unit off and on again and the text doesn't get transmitted. I've cleared out as much of my code as I can and as you can see it doesn't leave many places to go wrong.
Attached is the (#list) .lst file:
| Code: |
CCS PCH C Compiler, Version 4.125, 54981 16-May-12 10:20
Filename:
ROM used: 200 bytes (0%)
Largest free fragment is 55934
RAM used: 9 (0%) at main() level
10 (0%) worst case
Stack: 1 locations
*
00000: GOTO 0068
....................
.................... #include <18F4620.h>
.................... //////// Standard Header file for the PIC18F4620 device ////////////////
.................... #device PIC18F4620
.................... #list
....................
.................... #fuses H4, NOWDT, NOBROWNOUT, NOPUT, NOLVP, NOMCLR
.................... #USE delay(crystal=10Mhz, clock=40Mhz)
*
0001A: CLRF FEA
0001C: MOVLW 09
0001E: MOVWF FE9
00020: MOVF FEF,W
00022: BZ 0040
00024: MOVLW 0C
00026: MOVWF 01
00028: CLRF 00
0002A: DECFSZ 00,F
0002C: BRA 002A
0002E: DECFSZ 01,F
00030: BRA 0028
00032: MOVLW F7
00034: MOVWF 00
00036: DECFSZ 00,F
00038: BRA 0036
0003A: BRA 003C
0003C: DECFSZ FEF,F
0003E: BRA 0024
00040: GOTO 00BA (RETURN)
....................
.................... #BYTE port_b = 0xF81
.................... #zero_ram
....................
.................... #define BOOTLOADER_END (150*64)
.................... #build(reset=0x00:0x07)
.................... #org 0xEF, BOOTLOADER_END {}
....................
....................
.................... #define MCUADDRESS 0x12
.................... #define BOOTLOADER_NOT_PRESENT
....................
.................... #use RS232 (STREAM=DEBUGSERIAL, baud=115200, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
.................... void main() {
*
00068: CLRF FEA
0006A: CLRF FE9
0006C: CLRF 04
0006E: BSF FB8.3
00070: MOVLW 56
00072: MOVWF FAF
00074: MOVLW 00
00076: MOVWF FB0
00078: MOVLW A6
0007A: MOVWF FAC
0007C: MOVLW 90
0007E: MOVWF FAB
00080: MOVF FC1,W
00082: ANDLW C0
00084: IORLW 0F
00086: MOVWF FC1
00088: MOVLW 07
0008A: MOVWF FB4
0008C: CLRF FF8
0008E: BCF FD0.7
00090: MOVLW 7E
00092: MOVWF 00
00094: MOVLW 10
00096: MOVWF 01
00098: MOVLW 02
0009A: MOVWF FE9
0009C: MOVLW 00
0009E: MOVWF FEA
000A0: CLRF FEE
000A2: DECFSZ 00,F
000A4: BRA 00A0
000A6: DECFSZ 01,F
000A8: BRA 00A0
000AA: CLRF 05
000AC: CLRF 06
000AE: CLRF 07
.................... int8 ByteCount = 0x00;
.................... int8 TempByte = 0x00;
.................... int8 BitCount = 0x00;
....................
....................
.................... delay_ms(2000);
000B0: MOVLW 08
000B2: MOVWF 08
000B4: MOVLW FA
000B6: MOVWF 09
000B8: BRA 001A
000BA: DECFSZ 08,F
000BC: BRA 00B4
....................
.................... fprintf(DEBUGSERIAL, "Philips Starting\n");
000BE: MOVLW 08
000C0: MOVWF FF6
000C2: MOVLW 00
000C4: MOVWF FF7
000C6: BRA 0044
....................
.................... while(TRUE){}
000C8: BRA 00C8
....................
....................
....................
....................
000CA: SLEEP
Configuration Fuses:
Word 1: C600 H4 FCMEN IESO
Word 2: 1E19 NOPUT NOBROWNOUT BORV20 NOWDT WDT32768
Word 3: 0700 CCP2C1 PBADEN LPT1OSC NOMCLR
Word 4: 0081 STVREN NOLVP NOXINST NODEBUG
Word 5: C00F NOPROTECT NOCPB NOCPD
Word 6: E00F NOWRT NOWRTC NOWRTB NOWRTD
Word 7: 400F NOEBTR NOEBTRB |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Wed May 16, 2012 6:10 am |
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I would make sure the clock is running at the speed you expect. Can you put a scope on the serial and see if the baud rate is way off? Output a square wave and verify the speed with either a scope, or make it real slow and use a watch.
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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drh
Joined: 12 Jul 2004
Posts: 192
Location: Hemet, California USA
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| Posted: Wed May 16, 2012 8:21 am |
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Enable the Power Up Timer?
_________________
David |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Wed May 16, 2012 8:56 am |
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Is the programmer still attached when it works?.
Obvious thing would be something like a ground connection not made, but going through the programmer unit when it is present....
Best Wishes |
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Geps
Joined: 05 Jul 2010
Posts: 129
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| Posted: Thu May 17, 2012 1:52 am |
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Thanks guys,
After a couple more hours investigating it seems it was a faulty board that was drawing power from the USB cable. |
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