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Using multiple LCDs

 
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Paulvk

Bascom Member



Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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PostPosted: Mon Apr 30, 2018 10:40 am    Post subject: Using multiple LCDs Reply with quote
Normally with bascom you use only one lcd but sometimes its nice to have more than one
Here I will show how to use four or more by switching the chip select lines with an analog switch IC.
Below is a circuit diagram to show how its done I will post some code when I have finished testing
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Paulvk

Bascom Member



Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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PostPosted: Sat May 12, 2018 5:30 am    Post subject: Reply with quote
Here are two LCDs displaying different information
this is data from my offgrid solar system
and code used to initialise the two LCDs
Regards Paul
Code:

'=====================================

 Glcd_cs1 Alias Portc.2
 Glcd_cs2 Alias Portc.3

   'select LCD two

            'Portd.7 = 0
          Reset Portd.7
            'Portd.6 = 1
          Set Portd.6

       'make both chip select 1
   Set Glcd_cs1
   Set Glcd_cs2
       'call initialise LCD from library
         !call _Init_lcd
       'make both chip select 0
   Reset Glcd_cs1
   Reset Glcd_cs2

     'select LCD one
             'Portd.7 = 0
            Reset Portd.7
            'Portd.6 = 0
             Reset Portd.6

       'make both chip select 1
   Set Glcd_cs1
   Set Glcd_cs2
      'call initialise LCD from library
         !call _Init_lcd
       'make both chip select 0
   Reset Glcd_cs1
   Reset Glcd_cs2
 
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jure_m

Bascom Member



Joined: 14 Jan 2005
Posts: 68
Location: Ljubljana
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PostPosted: Thu Jun 21, 2018 8:36 am    Post subject: Reply with quote
Hi Paul,

check if this is of any use for you.

I have used SPI because I wanted to drive LCD with 8-pin AVRs.

Best regards
Jure
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Paulvk

Bascom Member



Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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PostPosted: Thu Jun 21, 2018 11:59 am    Post subject: Reply with quote
Hello jure

Yes we have two solutions for character LCDs SPI & I2C
These are graphic LCDs it would be great to have the same for them
they use almost two ports.
Regards Paul
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