I2C LCD

[midali]

Nothing on LCD: I2CWRITE SDA, SCL,com,$40, x
In ST7036 manual I not found how I can display a decimal number.

[richard]

I2CWRITE SDA, SCL,com,$40,"hello"

looks like incorrect syntax , should be like this

I2CWRITE SDA, SCL,com,[$40,"hello"]

to display x (assume pbp3)

buff var byte[16]

ARRAYWRITE buff,[dec3 x]
I2CWRITE SDA, SCL,com,[$40,str buff"]

[/CODE]

[Heckler]

Now that I think about it you probably will need to include a "Modifer" before your variable.

Otherwise your LCD display may think the number is some sort of control character or it may be a non displayable character.


from the PBP manual...

An assortment of string-formatting modifiers is available for use within the item list
of this command. These modifiers can be used to format string output that includes
numeric values converted from variables:
Output Modifiers for Formatting Strings
Modifier Operation
{I}{S}DEC{1..10} Send decimal digits
{I}{S}BIN{1..32} Send binary digits
{I}{S}HEX{1..8} Send hexadecimal digits
REP char\count Send character c repeated n
times
STR ArrayVar{\count} Send string of n characters
See section 2.11 for details on string-formatting modifiers.

[midali]

Now display the x value on LCD , like "hello 012" .

In main loop, the text is scrolling from right to left on 2 lines.

SCL   VAR PORTC.0
SDA   var PORTC.1
Reset var PORTC.2    
x     var byte   :x=12
com   con $78
buff  var byte[16]
pause 100
HIGH Reset

goto StartProgram
'********************************************************************************
'=============Initializing LCD==========
ST7036Init:
I2CWRITE SDA,SCL,com,[$00,$38]'function set
pause 1
I2CWRITE SDA,SCL,com,[$00,$39]'function set
pause 1
I2CWRITE SDA,SCL,com,[$00,$14]'internal OSC
pause 1
I2CWRITE SDA,SCL,com,[$00,$6A]'follower control
pause 1
I2CWRITE SDA,SCL,com,[$00,$0C]'display on/off
pause 1
here:
I2CWRITE SDA,SCL,com,[$00,$01]'clear display
pause 1
I2CWRITE SDA,SCL,com,[$00,$06]'entry mode set
pause 1
Return
'********************************************************************************
startProgram:
ARRAYWRITE buff,[dec3 x]

gosub  ST7036Init

I2CWRITE SDA, SCL,com,[$40,"hello  ",str buff\x]

Main:
'I2CWRITE SDA, SCL,com,[$40,"hello  ",str buff\x]
pause 1000
goto Main

Thank you very much for your help!

[richard]

I2CWRITE SDA, SCL,com,[$40,"hello ",str buff\x]

is incorrect

I2CWRITE SDA, SCL,com,[$40,"hello ",str buff]

or

I2CWRITE SDA, SCL,com,[$40,"hello ",str buff\3 ]

is whats required.


The "\x" ( length specifier) if used is the number or chr's in the the string {buff in this case } to send (12 {the value of x} is inappropriate), a null terminated string (as created by arraywrite ) needs no length parameter to be specified if you wish to send the entire string

[midali]

Now I understand arrays variable. Thank you for your patience and explanation!

[zoltanh]

Hi,

I am just curious. Did you manage to run LCD with the pinout from MIDAS? I mean the pinout you mentioned at beginning of this thread.