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big_nige
Joined: 30 Nov 2009
Posts: 7
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| gets() not working with PIC18LF2550 |
 Posted: Fri Mar 19, 2010 11:06 pm |
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Hi All,
Using PCHL 4.101; 7/1/2009
gets() seems to be hanging and I am not sure what is going on.
Test code:
| Code: | #include <18F2550.h>
#fuses INTRC_IO,CPUDIV1,NOWDT,NOPROTECT
#use delay(clock=8MHZ,RESTART_WDT)
#use rs232(uart1, baud=57600)
void main() {
char cmd[30];
while (TRUE){
printf("enter string: ");
//cmd[0] = getc();
gets(cmd);
printf("you entered: %s(%x)\r\n", cmd, cmd[0]);
}
} |
this code locks up does not detect RETURN (0x0D).
test code 2:
| Code: | #include <18F2550.h>
#fuses INTRC_IO,CPUDIV1,NOWDT,NOPROTECT
#use delay(clock=8MHZ,RESTART_WDT)
#use rs232(uart1, baud=57600)
void main() {
char cmd[30];
while (TRUE){
printf("enter string: ");
cmd[0] = getc();
//gets(cmd);
printf("you entered: %s(%x)\r\n", cmd, cmd[0]);
}
} |
This code accepts characters fine, for example if you hit 'e' it prints out:
'you entered: e(65)'
And if you hit the enter key, it prints:
'you entered: (0D).
So my serial link is working, and the chip detects a return, but the gets() does not.
Any ideas?
Cheers,
Nigel |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Mar 21, 2010 2:00 pm |
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You're using the Linux version of the compiler. I don't think the version
numbers of the Linux compiler track with the Windows version. So I
don't think I can duplicate your environment.
Can you compile a stripped down version of your code, as shown below,
and post the .LST file. Then I can look at it and see if it's doing
something wrong.
| Code: |
#include <18F2550.h>
#fuses INTRC_IO,CPUDIV1,NOWDT,NOPROTECT
#use delay(clock=8MHZ,RESTART_WDT)
#use rs232(uart1, baud=57600)
//===============================
void main()
{
char cmd[30];
while(1)
{
gets(cmd);
printf("%s(%x)\r\n", cmd, cmd[0]);
}
} |
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big_nige
Joined: 30 Nov 2009
Posts: 7
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| Posted: Mon Mar 22, 2010 12:59 am |
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As requested:
| Code: | CCS PCH C Compiler, Version 4.101, 51450 22-Mar-10 17:56
Filename: /home/nigel/redearth/smseries/test_ccs.lst
ROM used: 218 bytes (1%)
Largest free fragment is 32550
RAM used: 34 (2%) at main() level
36 (2%) worst case
Stack: 1 locations
*
0000: GOTO 0060
.................... #include <18F2550.h>
.................... //////// Standard Header file for the PIC18F2550 device ////////////////
.................... #device PIC18F2550
.................... #list
....................
.................... #fuses INTRC_IO,CPUDIV1,NOWDT,NOPROTECT
.................... #use delay(clock=8MHZ,RESTART_WDT)
.................... #use rs232(uart1, baud=57600)
....................
.................... //===============================
.................... void main()
.................... {
0060: CLRF FF8
0062: BCF FD0.7
0064: CLRF FEA
0066: CLRF FE9
0068: MOVLW 70
006A: MOVWF FD3
006C: MOVF FD3,W
006E: BSF FB8.3
0070: MOVLW 22
0072: MOVWF FAF
0074: MOVLW 00
0076: MOVWF FB0
0078: MOVLW A6
007A: MOVWF FAC
007C: MOVLW 90
007E: MOVWF FAB
0080: MOVF FC1,W
0082: ANDLW C0
0084: IORLW 0F
0086: MOVWF FC1
0088: MOVLW 07
008A: MOVWF FB4
.................... char cmd[30];
....................
.................... while(1)
.................... {
.................... gets(cmd);
008C: CLRF FEA
008E: MOVLW 05
0090: MOVWF FE9
0092: DECF FE9,F
0094: BTFSS F9E.5
0096: BRA 0094
0098: MOVFF FAE,FEE
009C: MOVLW 0D
009E: SUBWF FEF,W
00A0: BNZ 0092
00A2: CLRF FEF
.................... printf("%s(%x)\r\n", cmd, cmd[0]);
00A4: CLRF FEA
00A6: MOVLW 05
00A8: MOVWF FE9
00AA: BRA 0004
00AC: MOVLW 28
00AE: BTFSS F9E.4
00B0: BRA 00AE
00B2: MOVWF FAD
00B4: MOVFF 05,23
00B8: MOVLW 57
00BA: MOVWF 24
00BC: BRA 001C
00BE: MOVLW 29
00C0: BTFSS F9E.4
00C2: BRA 00C0
00C4: MOVWF FAD
00C6: MOVLW 0D
00C8: BTFSS F9E.4
00CA: BRA 00C8
00CC: MOVWF FAD
00CE: MOVLW 0A
00D0: BTFSS F9E.4
00D2: BRA 00D0
00D4: MOVWF FAD
.................... }
00D6: BRA 008C
.................... }
00D8: SLEEP
Configuration Fuses:
Word 1: C827 INTRC_IO IESO FCMEN PLL12 CPUDIV1 USBDIV
Word 2: 1E3E BROWNOUT NOWDT BORV20 PUT WDT32768 VREGEN
Word 3: 8700 PBADEN CCP2C1 MCLR LPT1OSC
Word 4: 0081 STVREN NODEBUG NOLVP NOXINST
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTC NOWRTB
Word 7: 400F NOEBTR NOEBTRB |
Cheers,
Nigel |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Mar 22, 2010 1:47 am |
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I think gets() is buggy in your version. Try using get_string() in input.c
instead. The input.c file is in the CCS drivers directory. get_string()
requires that you supply the maximum buffer length. |
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big_nige
Joined: 30 Nov 2009
Posts: 7
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| Posted: Mon Mar 22, 2010 2:35 am |
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yeah - that fixed it.
I tried my own quick-and-dirty getc loop testing for ENTER key and it works too - so I would agree that there is a bug in the compiler somewhere.
Thanks for your help.
Nigel |
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