Now the RTC doesn't print correctly! (??:??:??)

[Sandman]

[Edit]
the program was compiled using IDE 3.36 and compiler version PCM 3.170
[/Edit]
I have been sweating over this for several days now...

I have CCS PIC development kit and for some reason all I get is garbage.

I have simplified the code 'till nothing is left but a simple printf command. It still doesn't do anything but FLOOD my serial input/output monitor (SIOW).

This is the header file code:
#include <16F877A.h>
#fuses HS, NOLVP, NOWDT, PUT
#use delay(clock=2000000)
#use rs232 (baud=9600, xmit=PIN_C6, rcv=PIN_C7)

And this is the main code:
void main()
{
// int hour, min, sec, last_sec;
printf("random text");
delay_ms(1000);

/*rtc_init();
rtc_set_datetime(0,0,0,0,hour,min);
printf("\r\nkljaf");
delay_ms(1000);
while(TRUE)
{
rtc_get_time(hour,min,sec);
if(sec!=last_sec)
{
printf("\r\nhejhopp");
display_bcd(hour); putc(':');
display_bcd(min); putc(':');
display_bcd(sec);
last_sec=sec;
}
if(kbhit() && (getc()=='S'))
set_time();
}*/
}


Now, why on earth does my output look like garbage? The SIOW is configured to listen to the rigth com-port at the correct baud and bit settings..
Oh, and yes, I am sure that I compile the right file and that I program it with the right hex file afterwards.

!!!WHY!!!

[rwyoung]

[Sandman]

[Edit]
In the code below, if I set the variables to the initial values as follows: hour=10, min=20
I still get 00:00:00 as my first and only "numerical" printout. The following is questionmarks. I also tried with a delay after setting the time, to allow the RTC to increase its timer to 1 or 2 seconds, but it still prints as 00:00:00.

I feel that I have exhausted all tests and trials and I can not for the life of me see why this doesnt work!

Now it doesn't even say 00:00:00 first.. it starts with the questionmarks right off the bat, and I have not even re-programmed the pic, just stopped it and re-set it. aargh

[/Edit]

Well, it wasn't VERY obvious, but I found out when I looked in SIOW that I had to change the display to ASCII and increase the font-size... I always assumed that it -was- set to ASCII.. So that took care of the printf statement...

Now, I get the text, but when I try to display the time from the RTC, I get 00:00:00 the first time I print it out, and for ALL consequtive printings, I get ??:??:?? though on another computer running the same program but on a PIC16F877 (not 877A) it prints <<:<<:<<....
The code is:

#include <16F877A.h>
#fuses HS, NOLVP, NOWDT, PUT
#use delay (clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)

#include <nju6355.c>

void display_bcd(byte n)
{
putc( (n/16)+'0');
putc( (n%16)+'0');
}

void main()
{
int hour=0, min=0, sec;

rtc_init();
rtc_set_datetime(0,0,0,0,hour,min);
while(TRUE)
{
printf("\r\nkjkep");
rtc_get_time(hour,min,sec);
delay_ms(10);
display_bcd(hour); putc(':');
delay_ms(10);
display_bcd(min); putc(':');
delay_ms(10);
display_bcd(sec);
delay_ms(10);
printf("\r\n");
delay_ms(500);
}
}


I think the nju6355.c is part of the CCS package, so I wont re-print it here unless told otherwise. (It's not that big, but it is created by CCS and should work?)

The code above is a "rip-off" from excercise 19 in the booklet that came with the development code. Even when following the code in the example to the letter, I still dont get the time printed out, just the questionmarks.

Anyone who knows if this is a normal problem?

[Dargar]

YES! I get to help someone!!

I had the same problem with my RTC, and it turned out that, at least in my copy, the nju6355.c lists B3 as the IO pin to connect to the RTC, but in the leaflet in the drawing, it tells you to connect B4 to the RTC IO..

So, either change the c file to B4 or take the wire that sits in B4 and move it to B3!

Good luck, and let me know if it helped!