rs232 with 16 and 18 series

[christian]

Hi, I am having a problem with serial communication using any pic18f series chip, the following code works very well for all the 16f series i have tried

------------------------------------------------------------------------------------
//#include <18F452.h>
#include <16F877A.h>
#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP

#use rs232(DEBUGGER)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=pc)


char commandstring[30];
Int i;
Int buffer[];

#int_RDA
void RDA_isr()
{
fgets(commandstring, pc);
fprintf(pc,"%s\n", commandstring);
}


void main()
{
enable_interrupts(INT_RDA); // Enable Rx interrupt
enable_interrupts(GLOBAL); // Enable Global interrupts

while(1)
{

}


}
---------------------------------------------------------------------------

this same code wont work for my pic18f452, or 18f458. If i use an external interrupt the code works except that the first charater is screwed up (as expected), but i find this to be a very lousy way to do it.

Please if you can help me find out why the 18f series wont work with the above code plz reply. Thank you in advance

[PCM programmer]

I tested your code with PCH vs. 3.188 and it worked on a 18F452.
I'm running at 4 MHz, so I changed the fuse to XT.

What compiler version are you using ?

[christian]

Thanks for the reply, i'm using pch vs 3.211.

[PCM programmer]

I don't have that version. I didn't renew the maintenance for PCH
because vs. 3.188 works OK for me. Someone else will have to
test that version for you.

[Guest]

thank very much sir

[PCM programmer]

If you still have download rights, you should download vs. 3.191 and
try it.
http://www.ccsinfo.com/download.shtml

[ckielstra]

Christian,
Very likely your problem is hardware related. I can't remember anyone posting an RS-232 related problem caused by the compiler recently. Can you describe the circuit connected to C6 and C7? Are you using a MAX232 or similar circuit?

[Christian]

I wish i could say it was hardware related, 16f877 and 18f452 have the same pinouts, so i think its safe to rule that out

[ckielstra]

[Christian]

whats a list file? . btw thank you for your time

[ckielstra]

[Christian]

-----------------------------------------------------------------------
CCS PCM C Compiler, Version 3.211, 16465 20-Feb-05 19:54

Filename: C:\Program Files\PICC\Examples\checkin.LST

ROM used: 113 words (1%)
Largest free fragment is 2048
RAM used: 45 (26%) at main() level
46 (26%) worst case
Stack: 1 worst case (0 in main + 1 for interrupts)

*
0000: MOVLW 00
0001: MOVWF 0A
0002: GOTO 056
0003: NOP
0004: MOVWF 7F
0005: SWAPF 03,W
0006: CLRF 03
0007: MOVWF 21
0008: MOVF 0A,W
0009: MOVWF 20
000A: CLRF 0A
000B: MOVF 04,W
000C: MOVWF 22
000D: MOVF 77,W
000E: MOVWF 23
000F: MOVF 78,W
0010: MOVWF 24
0011: MOVF 79,W
0012: MOVWF 25
0013: MOVF 7A,W
0014: MOVWF 26
0015: MOVF 7B,W
0016: MOVWF 27
0017: BCF 03.7
0018: BCF 03.5
0019: MOVLW 8C
001A: MOVWF 04
001B: BTFSS 00.5
001C: GOTO 01F
001D: BTFSC 0C.5
001E: GOTO 032
001F: MOVF 22,W
0020: MOVWF 04
0021: MOVF 23,W
0022: MOVWF 77
0023: MOVF 24,W
0024: MOVWF 78
0025: MOVF 25,W
0026: MOVWF 79
0027: MOVF 26,W
0028: MOVWF 7A
0029: MOVF 27,W
002A: MOVWF 7B
002B: MOVF 20,W
002C: MOVWF 0A
002D: SWAPF 21,W
002E: MOVWF 03
002F: SWAPF 7F,F
0030: SWAPF 7F,W
0031: RETFIE
0032: BCF 0A.3
0033: BCF 0A.4
0034: GOTO 035
....................
.................... //#include <18F452.h>
.................... #include <16F877A.h>
.................... //////// Standard Header file for the PIC16F877A device ////////////////
.................... #device PIC16F877A
.................... #list
....................
.................... #use delay(clock=20000000)
.................... #fuses HS,NOWDT,NOPROTECT,NOLVP
....................
.................... #use rs232(DEBUGGER)
.................... #use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=pc)
....................
....................
.................... char commandstring[30];
.................... Int i;
.................... Int buffer[];
....................
.................... #int_RDA
.................... void RDA_isr()
.................... {
.................... fgets(commandstring, pc);
0035: MOVLW 28
0036: MOVWF 04
0037: DECF 04,F
0038: INCF 04,F
0039: BTFSS 0C.5
003A: GOTO 039
003B: MOVF 1A,W
003C: MOVWF 00
003D: MOVLW 0D
003E: SUBWF 00,W
003F: BTFSS 03.2
0040: GOTO 038
0041: CLRF 00
.................... fprintf(pc,"%s\n", commandstring);
0042: MOVLW 28
0043: MOVWF 04
0044: MOVLW 00
0045: IORWF 00,W
0046: BTFSC 03.2
0047: GOTO 04E
0048: BTFSS 0C.4
0049: GOTO 048
004A: MOVF 00,W
004B: MOVWF 19
004C: INCF 04,F
004D: GOTO 044
004E: MOVLW 0A
004F: BTFSS 0C.4
0050: GOTO 04F
0051: MOVWF 19
.................... }
....................
....................
0052: BCF 0C.5
0053: BCF 0A.3
0054: BCF 0A.4
0055: GOTO 01F
.................... void main()
.................... {
0056: CLRF 04
0057: MOVLW 1F
0058: ANDWF 03,F
0059: BSF 03.5
005A: BSF 1F.0
005B: BSF 1F.1
005C: BSF 1F.2
005D: BCF 1F.3
005E: MOVLW 07
005F: BCF 03.5
0060: MOVWF 1F
0061: BSF 00.0
0062: MOVLW 81
0063: BSF 03.5
0064: MOVWF 19
0065: MOVLW 26
0066: MOVWF 18
0067: MOVLW 90
0068: BCF 03.5
0069: MOVWF 18
.................... enable_interrupts(INT_RDA); // Enable Rx interrupt
006A: BSF 03.5
006B: BSF 0C.5
.................... enable_interrupts(GLOBAL); // Enable Global interrupts
006C: MOVLW C0
006D: BCF 03.5
006E: IORWF 0B,F
....................
.................... while(1)
.................... {
....................
.................... }
006F: GOTO 06F
....................
....................
.................... }
....................
0070: SLEEP

Configuration Fuses:
Word 1: 3F7A HS NOWDT NOPUT NODEBUG NOPROTECT BROWNOUT NOLVP NOCPD NOWRT

-----------------------------------------------------------------------------

[ckielstra]

You posted the 16F877A list file which has no problems...
Please post the 18F452 list file.

[Christian]

sorry bout that

-----------------------------------------------------------
CCS PCH C Compiler, Version 3.211, 16465 21-Feb-05 09:01

Filename: C:\Program Files\PICC\Examples\checkin.LST

ROM used: 256 bytes (1%)
Largest free fragment is 32508
RAM used: 56 (4%) at main() level
58 (4%) worst case
Stack: 1 worst case (0 in main + 1 for interrupts)

*
0000: GOTO 00DA
*
0008: MOVWF 05
000A: MOVFF FD8,06
000E: MOVF FE9,W
0010: MOVWF 07
0012: MOVF FEA,W
0014: MOVWF 08
0016: MOVF FE1,W
0018: MOVWF 09
001A: MOVF FE2,W
001C: MOVWF 0A
001E: MOVF FD9,W
0020: MOVWF 0B
0022: MOVF FDA,W
0024: MOVWF 0C
0026: MOVF FF3,W
0028: MOVWF 14
002A: MOVF FF4,W
002C: MOVWF 15
002E: MOVF FE0,W
0030: MOVWF 0D
0032: MOVLB 0
0034: MOVF 00,W
0036: MOVWF 0F
0038: MOVF 01,W
003A: MOVWF 10
003C: MOVF 02,W
003E: MOVWF 11
0040: MOVF 03,W
0042: MOVWF 12
0044: MOVF 04,W
0046: MOVWF 13
0048: BTFSS F9D.5
004A: GOTO 0054
004E: BTFSC F9E.5
0050: GOTO 0096
0054: MOVF 0F,W
0056: MOVWF 00
0058: MOVF 10,W
005A: MOVWF 01
005C: MOVF 11,W
005E: MOVWF 02
0060: MOVF 12,W
0062: MOVWF 03
0064: MOVF 13,W
0066: MOVWF 04
0068: MOVF 0D,W
006A: MOVWF FE0
006C: BSF 0D.7
006E: MOVF 07,W
0070: MOVWF FE9
0072: MOVF 08,W
0074: MOVWF FEA
0076: MOVF 09,W
0078: MOVWF FE1
007A: MOVF 0A,W
007C: MOVWF FE2
007E: MOVF 0B,W
0080: MOVWF FD9
0082: MOVF 0C,W
0084: MOVWF FDA
0086: MOVF 14,W
0088: MOVWF FF3
008A: MOVF 15,W
008C: MOVWF FF4
008E: MOVF 05,W
0090: MOVFF 06,FD8
0094: RETFIE 0
....................
.................... #include <18F452.h>
.................... //////// Standard Header file for the PIC18F452 device ////////////////
.................... #device PIC18F452
.................... #list
....................
.................... //#include <16F877A.h>
.................... #use delay(clock=20000000)
.................... #fuses HS,NOWDT,NOPROTECT,NOLVP
....................
.................... #use rs232(DEBUGGER)
.................... #use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=pc)
....................
....................
.................... char commandstring[30];
.................... Int i;
.................... Int buffer[];
....................
.................... #int_RDA
.................... void RDA_isr()
.................... {
.................... fgets(commandstring, pc);
0096: CLRF FEA
0098: MOVLW 17
009A: MOVWF FE9
009C: DECF FE9,F
009E: INCF FE9,F
00A0: BTFSS F9E.5
00A2: BRA 00A0
00A4: MOVFF FAE,FEF
00A8: MOVLW 0D
00AA: SUBWF FEF,W
00AC: BNZ 009E
00AE: CLRF FEF
.................... fprintf(pc,"%s\n", commandstring);
00B0: CLRF FEA
00B2: MOVLW 17
00B4: MOVWF FE9
00B6: MOVLW 00
00B8: IORWF FEF,W
00BA: BZ 00CC
00BC: BTFSS F9E.4
00BE: BRA 00BC
00C0: MOVFF FEF,FAD
00C4: INCF FE9,F
00C6: BTFSC FD8.2
00C8: INCF FEA,F
00CA: BRA 00B6
00CC: MOVLW 0A
00CE: BTFSS F9E.4
00D0: BRA 00CE
00D2: MOVWF FAD
.................... }
....................
....................
00D4: BCF F9E.5
00D6: GOTO 0054
.................... void main()
.................... {
00DA: CLRF FF8
00DC: BCF FD0.7
00DE: BSF 0D.7
00E0: CLRF FEA
00E2: CLRF FE9
00E4: BSF FC1.0
00E6: BSF FC1.1
00E8: BSF FC1.2
00EA: BCF FC1.3
00EC: BSF 00.0
00EE: MOVLW 81
00F0: MOVWF FAF
00F2: MOVLW 26
00F4: MOVWF FAC
00F6: MOVLW 90
00F8: MOVWF FAB
.................... enable_interrupts(INT_RDA); // Enable Rx interrupt
00FA: BSF F9D.5
.................... enable_interrupts(GLOBAL); // Enable Global interrupts
00FC: MOVLW C0
00FE: IORWF FF2,F
....................
.................... while(1)
.................... {
....................
.................... }
0100: BRA 0100
....................
....................
.................... }
....................
0102: SLEEP

Configuration Fuses:
Word 1: 2200 HS NOOSCSEN
Word 2: 0E0F BROWNOUT WDT128 NOWDT BORV20 NOPUT
Word 3: 0100 CCP2C1
Word 4: 0081 STVREN NODEBUG NOLVP
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTB NOWRTC
Word 7: 400F NOEBTR NOEBTRB

[Christian]

sorry bout that
--------------------------------------------

CCS PCH C Compiler, Version 3.211, 16465 21-Feb-05 09:01

Filename: C:\Program Files\PICC\Examples\checkin.LST

ROM used: 256 bytes (1%)
Largest free fragment is 32508
RAM used: 56 (4%) at main() level
58 (4%) worst case
Stack: 1 worst case (0 in main + 1 for interrupts)

*
0000: GOTO 00DA
*
0008: MOVWF 05
000A: MOVFF FD8,06
000E: MOVF FE9,W
0010: MOVWF 07
0012: MOVF FEA,W
0014: MOVWF 08
0016: MOVF FE1,W
0018: MOVWF 09
001A: MOVF FE2,W
001C: MOVWF 0A
001E: MOVF FD9,W
0020: MOVWF 0B
0022: MOVF FDA,W
0024: MOVWF 0C
0026: MOVF FF3,W
0028: MOVWF 14
002A: MOVF FF4,W
002C: MOVWF 15
002E: MOVF FE0,W
0030: MOVWF 0D
0032: MOVLB 0
0034: MOVF 00,W
0036: MOVWF 0F
0038: MOVF 01,W
003A: MOVWF 10
003C: MOVF 02,W
003E: MOVWF 11
0040: MOVF 03,W
0042: MOVWF 12
0044: MOVF 04,W
0046: MOVWF 13
0048: BTFSS F9D.5
004A: GOTO 0054
004E: BTFSC F9E.5
0050: GOTO 0096
0054: MOVF 0F,W
0056: MOVWF 00
0058: MOVF 10,W
005A: MOVWF 01
005C: MOVF 11,W
005E: MOVWF 02
0060: MOVF 12,W
0062: MOVWF 03
0064: MOVF 13,W
0066: MOVWF 04
0068: MOVF 0D,W
006A: MOVWF FE0
006C: BSF 0D.7
006E: MOVF 07,W
0070: MOVWF FE9
0072: MOVF 08,W
0074: MOVWF FEA
0076: MOVF 09,W
0078: MOVWF FE1
007A: MOVF 0A,W
007C: MOVWF FE2
007E: MOVF 0B,W
0080: MOVWF FD9
0082: MOVF 0C,W
0084: MOVWF FDA
0086: MOVF 14,W
0088: MOVWF FF3
008A: MOVF 15,W
008C: MOVWF FF4
008E: MOVF 05,W
0090: MOVFF 06,FD8
0094: RETFIE 0
....................
.................... #include <18F452.h>
.................... //////// Standard Header file for the PIC18F452 device ////////////////
.................... #device PIC18F452
.................... #list
....................
.................... //#include <16F877A.h>
.................... #use delay(clock=20000000)
.................... #fuses HS,NOWDT,NOPROTECT,NOLVP
....................
.................... #use rs232(DEBUGGER)
.................... #use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=pc)
....................
....................
.................... char commandstring[30];
.................... Int i;
.................... Int buffer[];
....................
.................... #int_RDA
.................... void RDA_isr()
.................... {
.................... fgets(commandstring, pc);
0096: CLRF FEA
0098: MOVLW 17
009A: MOVWF FE9
009C: DECF FE9,F
009E: INCF FE9,F
00A0: BTFSS F9E.5
00A2: BRA 00A0
00A4: MOVFF FAE,FEF
00A8: MOVLW 0D
00AA: SUBWF FEF,W
00AC: BNZ 009E
00AE: CLRF FEF
.................... fprintf(pc,"%s\n", commandstring);
00B0: CLRF FEA
00B2: MOVLW 17
00B4: MOVWF FE9
00B6: MOVLW 00
00B8: IORWF FEF,W
00BA: BZ 00CC
00BC: BTFSS F9E.4
00BE: BRA 00BC
00C0: MOVFF FEF,FAD
00C4: INCF FE9,F
00C6: BTFSC FD8.2
00C8: INCF FEA,F
00CA: BRA 00B6
00CC: MOVLW 0A
00CE: BTFSS F9E.4
00D0: BRA 00CE
00D2: MOVWF FAD
.................... }
....................
....................
00D4: BCF F9E.5
00D6: GOTO 0054
.................... void main()
.................... {
00DA: CLRF FF8
00DC: BCF FD0.7
00DE: BSF 0D.7
00E0: CLRF FEA
00E2: CLRF FE9
00E4: BSF FC1.0
00E6: BSF FC1.1
00E8: BSF FC1.2
00EA: BCF FC1.3
00EC: BSF 00.0
00EE: MOVLW 81
00F0: MOVWF FAF
00F2: MOVLW 26
00F4: MOVWF FAC
00F6: MOVLW 90
00F8: MOVWF FAB
.................... enable_interrupts(INT_RDA); // Enable Rx interrupt
00FA: BSF F9D.5
.................... enable_interrupts(GLOBAL); // Enable Global interrupts
00FC: MOVLW C0
00FE: IORWF FF2,F
....................
.................... while(1)
.................... {
....................
.................... }
0100: BRA 0100
....................
....................
.................... }
....................
0102: SLEEP

Configuration Fuses:
Word 1: 2200 HS NOOSCSEN
Word 2: 0E0F BROWNOUT WDT128 NOWDT BORV20 NOPUT
Word 3: 0100 CCP2C1
Word 4: 0081 STVREN NODEBUG NOLVP
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTB NOWRTC
Word 7: 400F NOEBTR NOEBTRB