Hi Rob,
I've often observed pseudo-vars don't behave the same as explicit
corresponding function call. Actually, I sometime tend not to trust them.
See for instance my post in jallist about "byte out black magic"
serial_hw_data = "a"
doesn't give the same results as
serial_hw_write("a")
in this context (which I did not clearly identified...).
For your problem, have you tried:
var byte v = line[i]
lcd = v
(just an idea/intuition...)
Cheers,
Seb
> >
> >> The API change of the lcd libs caused some errors in old samples.
> >> I volunteer to correct these (and replace some with new samples), unless
> >> you want to do it.
>
> > Thank you for volunteering, please correct/replace what you think is
> desireable.
>
> Before I start, I need to resolve an issue....
> After I made a minor change in my sample it doesn't work anymore as
> expected. See a (reduced) source below. I expect the first line to
> show 012...DEF (char by char), but in stead it is filled with 16 '0'
> characters. It looks like the index [i] is not used.
>
> When I change the statement
> lcd = line[i]
> into
> lcd_write_char(line[i])
> the expected 012...DEF is shown.
>
> Is this a compiler issue?
>
> Regards, Rob.
>
> > -- ------------------------------------------------------
> > include 16f877a -- target PICmicro
> > --
> > pragma target OSC HS -- HS crystal or resonator
> > pragma target clock 20_000_000 -- oscillator frequency
> > pragma target WDT disabled -- WDT off
> > -- pragma target MCLR external
> > --
> > enable_digital_io() -- disable analog I/O (if any)
> > --
> > const byte LCD_ROWS = 2 -- LCD with 2 lines
> > const byte LCD_CHARS = 16 -- and 16 characters per line
> > --
> > var byte lcd_dataport_low is portC_high
> > var byte lcd_dataport_high is portD_high
> > var bit lcd_en is pin_D3 -- data trigger
> > var bit lcd_rs is pin_D2 -- command/data select.
> > --
> > portC_high_direction = all_output
> > portD_high_direction = all_output
> > pin_D3_direction = output
> > pin_D2_direction = output
> > --
> > include lcd_hd44780_8
> > --
> > lcd_init() -- init the lcd controller
> > --
> > include delay -- fetch delay library
> > --
> > -- --- generate LCD screen activity ---------
> > var byte line[LCD_CHARS] = "0123456789ABCDEF"
> > var byte i
> > forever loop
> > lcd_clear_screen()
> > for LCD_CHARS using i loop
> > lcd = line[i] -- !! gives all 0
> > -- lcd_write_char(line[i]) -- !! give 012...DEF
> > delay_100ms(3) -- little pause
> > end loop
> > end loop
>
> --
> Rob Hamerling, Vianen, NL (http://www.robh.nl/)
>
> >
>
--
Sébastien Lelong
http://www.sirloon.net
http://sirbot.org
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