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Guest
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| printf() problem with int8 using rs232 |
 Posted: Tue Feb 08, 2005 7:43 am |
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Greetings,
I'm usingThe PCH C Compiler, Version 3.216 with the IDE version 3.215. I'm setting up a few basic tests to get familiar with the tools and hardware. The 18F458 micro is bread-boarded w/ a crystal, rs232 interface chip, and header for ICP. I cannot seem to get the printf() to correctly work with integers. Inside the test code, I try using several specification formats in the printf(). The only one that appears to work at all is the hex display (%x). My test code and results are listed below. Any help would be most appreciated.
Results: (captured data from each type of printf specification)
%d -> 26662666
%u -> 26266662
%x -> 0a0a0a0a
| Code: | #include <18F458.h>
#device ICD=TRUE
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=10000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7, PARITY=N, BITS=8, STREAM=DEBUG)
#define RED_LED pin_B4
void main() {
int value = 10;
do {
output_high(RED_LED);
//printf("%d", value);
//printf("%U", value);
//printf("%c", value);
//printf("%x", value);
delay_ms(2000);
output_low(RED_LED);
delay_ms(2000);
} while (TRUE);
} |
| Code: | CS PCH C Compiler, Version 3.216, 27010 07-Feb-05 16:50
Filename: C:\PICTest\RS232Test.LST
ROM used: 358 bytes (1%)
Largest free fragment is 31578
RAM used: 7 (0%) at main() level
11 (1%) worst case
Stack: 2 locations
*
0000: GOTO 010A
....................
.................... #include <18F458.h>
.................... //////// Standard Header file for the PIC18F458 device ////////////////
.................... #device PIC18F458
.................... #list
....................
.................... #device ICD=TRUE
.................... #fuses HS,NOWDT,NOPROTECT,NOLVP
.................... #use delay(clock=10000000)
00E0: CLRF FEA
00E2: MOVLW 08
00E4: MOVWF FE9
00E6: MOVF FEF,W
00E8: BZ 0108
00EA: MOVLW 03
00EC: MOVWF 01
00EE: CLRF 00
00F0: DECFSZ 00,F
00F2: BRA 00F0
00F4: DECFSZ 01,F
00F6: BRA 00EE
00F8: MOVLW 3C
00FA: MOVWF 00
00FC: DECFSZ 00,F
00FE: BRA 00FC
0100: NOP
0102: NOP
0104: DECFSZ FEF,F
0106: BRA 00EA
0108: RETLW 00
.................... #use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7, PARITY=N, BITS=8, STREAM=DEBUG)
....................
.................... #define RED_LED pin_B4
....................
....................
.................... void main() {
....................
010A: CLRF FF8
010C: BCF FD0.7
010E: CLRF FEA
0110: CLRF FE9
0112: BSF FC1.0
0114: BSF FC1.1
0116: BSF FC1.2
0118: BCF FC1.3
011A: MOVLW 07
011C: MOVWF FB4
011E: MOVF F96,W
0120: MOVF FB4,W
0122: BCF FA1.6
0124: MOVLW 81
0126: MOVWF FAF
0128: MOVLW 22
012A: MOVWF FAC
012C: MOVLW 90
012E: MOVWF FAB
.................... int value = 10;
0130: MOVLW 0A
0132: MOVWF 06
....................
.................... do {
....................
.................... output_high(RED_LED);
0134: BCF F93.4
0136: BSF F8A.4
....................
.................... printf("%d", value);
0138: MOVFF 06,07
013C: MOVLW 18
013E: MOVWF 08
0140: BRA 002C
....................
.................... //printf("%U", value);
....................
.................... //printf("%c", value);
....................
.................... //printf("%x", value);
....................
.................... delay_ms(2000);
0142: MOVLW 08
0144: MOVWF 07
0146: MOVLW FA
0148: MOVWF 08
014A: RCALL 00E0
014C: DECFSZ 07,F
014E: BRA 0146
....................
.................... output_low(RED_LED);
0150: BCF F93.4
0152: BCF F8A.4
.................... delay_ms(2000);
0154: MOVLW 08
0156: MOVWF 07
0158: MOVLW FA
015A: MOVWF 08
015C: RCALL 00E0
015E: DECFSZ 07,F
0160: BRA 0158
....................
.................... } while (TRUE);
....................
.................... }
0162: BRA 0134
....................
0164: BRA 0164
Configuration Fuses:
Word 1: 2200 HS NOOSCSEN
Word 2: 0E0F BROWNOUT WDT128 NOWDT BORV20 NOPUT
Word 3: 0000
Word 4: 0001 STVREN DEBUG NOLVP
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTB NOWRTC
Word 7: 400F NOEBTR NOEBTRB
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valemike
Guest
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| Posted: Tue Feb 08, 2005 8:33 am |
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Cut and paste the following code and try it on your hardware and Hyperterminal. It works fine using the PICDEM-2 Plus.
Also, make sure the clock=xxxxxx is correct.
Make sure you have Hyperterminal set at:
bits per second: 9600
data bits: 8
parity: none
stop bits: 1
Flow Control: Hardware
| Code: |
#include <18F458.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include <stdlib.h>
void main(void)
{
unsigned long number;
int i;
printf ("\r\n\r\n\r\n");
srand(16);
for (i=0; i<20; i++)
{
number = rand();
number = number%16;
printf ("%ld\r\n", number);
}
}
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rwyoung
Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA
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| Posted: Tue Feb 08, 2005 9:00 am |
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So from your test code, are you expected to view the results on your RS232 port or with your ICSP debugging pod?
If you are expecting to stream data through the debugging pod, forget it. I just doesn't seem to work all that well.
Otherwise your code seems OK for writing to a serial port at 1200bps assuming you have a 10MHz crystal.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month! |
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jma_1
Joined: 08 Feb 2005
Posts: 147
Location: Wisconsin
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| problem solved |
| Posted: Tue Feb 08, 2005 2:26 pm |
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Greetings,
I changed my bread-board setup to use a 5MHz crystal, re-connected everything and printf() with int8 works works fine now (PC RX using rs232). Perhaps a 10MHz crystal isn't the best idea for bread-boarding  Thanks for the replies |
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