Status: Assigned
Owner: robhamerling
Labels: Type-Defect Priority-Medium Component-External
New issue 137 by robhamerling: Error in
http://code.google.com/p/jallib/issues/detail?id=137
{ Reported by István Cserny }
There is an error in the file lib/lcd_hd44780_8.jal (this is in
jallib-pack-2.4n-0.6.0.zip)
In the procedure lcd_init() the underlined line (see the list below) is
unnecessary and wrong, therefore the LCDs can not work properly in 8-bit
mode. Please, remove this line! The correct parameter would be 0b0011_1000
but is is already sent in the previous command so it is unnecessary to sen
it again...
The same command is present also in the file lcd_hd44780_common.jal (the
first command in procedure _hd44780_init()). Wouldn't be better to move
that line into file lcd_hd44780_4.jal? It can be used for 4-bit mode only,
so there is no reason to use it in a "common" library.
8< ---- code snippet from lcd_hd44780_8.jal ----- >8
procedure lcd_init() is
-- first, init the interface
lcd_rs = LOW -- set to control char mode
delay_1ms(25) -- power-up delay (> 15 ms)
_lcd_write_command(0b0011_0000) -- function set
delay_1ms(5) -- > 4.1 milliseconds
_lcd_write_command(0b0011_0000) -- function set
delay_10us(10) -- > 100 us
_lcd_write_command(0b0011_0000) -- function set
delay_10us(4) -- > 37 us
_lcd_write_command(0b0011_1000) -- to 8-bit mode
delay_10us(4) -- > 37 us
_lcd_write_command(0b_0010_1000) -- 2 lines, 5x7 pattern
*******************************************************************
_lcd_write_command(0b_0001_1100) -- cursor move right
_lcd_write_command(0b_0000_1100) -- display on, cursor,blink off
_lcd_write_command(0b_0000_0110) -- cursor->right, no shift
lcd_clear_screen() -- clear screen
-- (incl switch to data char mode)
end procedure
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