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Defining Timer0 to 8bit on 18F452

 
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Kari
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Defining Timer0 to 8bit on 18F452
PostPosted: Mon Dec 29, 2003 4:25 am     Reply with quote
Even if I define Timer0 to 8bit,
"setup_timer_0(RTCC_EXT_H_TO_L|RTCC_8_BIT);"
"printf(lcd_putc,"%03u",get_rtcc());" is not working. Compiler says "print format type is invalid". GET_RTCC() returns still long int because "printf(lcd_putc,"%03lu",get_rtcc());" is working. Is there something else to remember to define RTCC to 8bit?

PCWH is 3.180

Regards Kari, Finland
Ttelmah
Guest
Re: Defining Timer0 to 8bit on 18F452
PostPosted: Mon Dec 29, 2003 5:25 am     Reply with quote
Kari wrote:
Even if I define Timer0 to 8bit,
"setup_timer_0(RTCC_EXT_H_TO_L|RTCC_8_BIT);"
"printf(lcd_putc,"%03u",get_rtcc());" is not working. Compiler says "print format type is invalid". GET_RTCC() returns still long int because "printf(lcd_putc,"%03lu",get_rtcc());" is working. Is there something else to remember to define RTCC to 8bit?

PCWH is 3.180

Regards Kari, Finland

'u', only supports an integer (8 bit). You have told the compiler to return a 16bit value for 'get_rtcc'. You need to use 'lu'.

Best Wishes
Kari
Guest
PostPosted: Mon Dec 29, 2003 5:58 am     Reply with quote
I have defined timer0 to work in 8-bit mode with this line:
setup_timer_0(RTCC_EXT_H_TO_L|RTCC_8_BIT);

Register value from asm listing is correct (0xF0).

Kari
Ttelmah
Guest
PostPosted: Mon Dec 29, 2003 7:20 am     Reply with quote
Kari wrote:
I have defined timer0 to work in 8-bit mode with this line:
setup_timer_0(RTCC_EXT_H_TO_L|RTCC_8_BIT);

Register value from asm listing is correct (0xF0).

Kari

You are operating the timer in 8bit 'mode', but the _function_, returns a 16bit value, because the timer supports this. Hence you either have to use a long declaration, or retrieve the low byte only.
This would work:
printf(lcd_putc,"%03u",(int8)get_rtcc());

Best Wishes
Kari
Guest
PostPosted: Mon Dec 29, 2003 7:44 am     Reply with quote
Ok thanks, now I know it. I am moving from 16f877 to 18f452 and looking for easiest way to change code for it.

kari
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