Hello,
I have recently moved to SDCC and even more recently started using PIC18*,
more specifically 18f2550. I have two problems that I canät seem to figure
out;
1. Whenever power is applied, the device seems to start up in a random
state and doesn't seem to start running the program. Programming the
device seems so make the device do *something*, but that seems quite
random as well, at different times, flashing the device with the exacttly
same hef file seems to do different things each time.
I program the device while it is in the circuit, the ICSP lines are
dedicated to programming, and a standard ASCII LCD is attatched in 4-bit
mode.
I build the hex file using this Makefile:
CC=/usr/local/bin/sdcc
CFLAGS= -mpic16 -p18f2550 --pstack-model=large
all: main.hex
main.dos.hex: main.hex
#-unix2dos -n main.hex main.hex.dos
main.hex: main.c lcd.o
$(CC) $(CFLAGS) main.c lcd.o
lcd.o: lcd.c
$(CC) $(CFLAGS) -c lcd.c
clean:
-rm *.asm *.cod *.hex *.lst *.o
The relevant parts of the main.c is
#include <pic18fregs.h>
#include <delay.h>
#include "lcd.h"
#include "main.h"
typedef unsigned int config;
code char at __CONFIG1L _config0 = 0x20; //0b00100000
code char at __CONFIG1H _config1 = 0x08; //0b00001000
code char at __CONFIG2L _config2 = 0x18; //0b00011000
code char at __CONFIG2H _config3 = 0x00; //0b00000000
code char at __CONFIG3H _config4 = 0x00; //0b00000000
code char at __CONFIG4L _config5 = 0xc0; //0b11000000
code char at __CONFIG5L _config6 = 0x0f; //0b00001111
code char at __CONFIG5H _config7 = 0xc0; //0b11000000
code char at __CONFIG6L _config8 = 0x0f; //0b00001111
code char at __CONFIG6H _config9 = 0xe0; //b11100000
code char at __CONFIG7L _config10 = 0x0f; //0b00001111
code char at __CONFIG7H _config11 = 0x40; //0b01000000
void init(void)
{
CVRCON=0x00; //0b00000000
OSCCON=0xf7; //0b11110111
CCP1CON=0x00; //0b00000000
CCP2CON=0x00; //0b00000000
UCFG=0x00; //0b00000000
ADCON0=0x00; //0b00000000
ADCON1=0x0f; //0b00001111
CMCON=0x07; //0b00000000
TRISA=0x00; //0b00000000
TRISB=0xff; //0b11111111
TRISC=0xfe; //0b11111110
}
// Snipped the "boring" parts
void main(void)
{
init();
delay100ktcy(9);
LCDinit();
delay100ktcy(9);
LCDconfig();
while(1)
{
LCDputc(0x41); //This is just an example of a function in lcd.c
}
}
and then in lcd.c, the relevant function would be:
void LCDputc(unsigned char c)
{
RS=1;
RW=0;
EN=1;
delay1ktcy(9);
LATAbits.LATA0=(c>>7)&0x01;
LATAbits.LATA1=(c>>6)&0x01;
LATAbits.LATA2=(c>>5)&0x01;
LATAbits.LATA3=(c>>4)&0x01;
delay1ktcy(9);
EN=0;
delay1ktcy(9);
EN=1;
delay1ktcy(9);
LATAbits.LATA0=(c>>3)&0x01;
LATAbits.LATA1=(c>>2)&0x01;
LATAbits.LATA2=(c>>1)&0x01;
LATAbits.LATA3=c&0x01;
delay1ktcy(9);
EN=0;
delay1ktcy(9);
LATA=PORTA&0xf0;
}
...which brings me to problem nr...
2. When I call LCDputc(somechar);, the "somechar" never seems to reach the
function, the unsigned char c won't be what it is supposed to be.
Apparently I have missed something here... I have spent a lot of time
trying to figure this out, but I have been totally stuck...
SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.7.2
#4886 (Jul 23 2007) (UNIX), running on amd64/linux.
Thank you,
Robert Bergfors
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