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albertsm
Joined: 09 Apr 2004
Posts: 6321
Location: Holland
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 Posted: Tue Feb 03, 2026 11:27 am Post subject: |
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ok i will post a similar version for the v2x2 version so you can use both SPI interfaces.
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guyadams
Joined: 22 Nov 2006
Posts: 44
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| Posted: Tue Feb 03, 2026 11:38 am Post subject: |
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| albertsm wrote: | | ok i will post a similar version for the v2x2 version so you can use both SPI interfaces. |
Great - not that it matters but it was a case of being able to use either TWI interface. This design does not actually use both but I needed to use the second TWI for the display as the ADC inputs on PortC were already used...
Best r
Guy |
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albertsm
Joined: 09 Apr 2004
Posts: 6321
Location: Holland
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| Posted: Tue Feb 03, 2026 3:01 pm Post subject: |
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Ok this version is the same as the previous one except it supports dynamic LCD address.
In order to use that create a variable named I2C_Addr and assign it the value of your LCD. That is typical &H78
For the rest use the I2C_TWI-MULTI.lib with its instructions.
You use 1 LCD so you only set the _I2CCHANNEL to the second TWI.
Now i think of it : the LCD lib you have now should work with the second TWI too ( I2C_TWI-MULTI.lib)
So please try that first if that is right.
glcdSSD1306-I2C-TWI-option.lib
I2C_TWI-MULTI.lib
And use the lib you tested last. It should work.
Then you can download and test the attached lib.
Same test. NO variable named I2C_ADDR and see if it still works.
Then the last test would be to create I2C_ADDR and assign it with &H78 BEFORE you use config graphlcd.
It should work too.
For users that want to use 2 LCD with different address : the multi lib is needed and since the lib initialize 1 LCD you have to call initlcd twice (one time with the address loaded in I2C_addr)
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guyadams
Joined: 22 Nov 2006
Posts: 44
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| Posted: Tue Feb 03, 2026 3:27 pm Post subject: |
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| Quote: | So please try that first if that is right.
glcdSSD1306-I2C-TWI-option.lib
I2C_TWI-MULTI.lib |
This works like a charm - toggling _i2cchannel redirects the display correctly. I did notice that as long as one TWI is configured , then both ports work.
I will do the other test in a moment.....
| Code: | '-------------------------------------------------------------------------------
' SSD1306-I2C.BAS
' (c) MCS Electronics 1995-2020
' Sample to demo the 128x64 I2C OLED display
'
'-------------------------------------------------------------------------------
$regfile = "m328pbdef.dat"
$hwstack = 32
$swstack = 32
$framesize = 32
$crystal = 8000000
Config Clockdiv = 1 ' make sure the chip runs at 8 MHz
'Config Scl = Portc.5 ' used i2c pins
'Config Sda = Portc.4
'Config Twi = 400000 ' i2c speed
Config Scl1 = PortE.1 ' used i2c pins
Config Sda1 = PortE.0
Config Twi1 = 400000 ' i2c speed
I2cinit
Const cTWI = 1
'$lib "i2c_twi.lbx" ' we do not use software emulated I2C but the TWI
$lib "I2c_twi-multi.lib" ' we do not use software emulated I2C but the TWI
'$lib "glcdSSD1306-I2C.lib" ' override the default lib with this special one
$lib "glcdSSD1306-I2C-TWI-option.lib" ' override the default lib with this special one
Dim _i2cchannel as byte
_i2cchannel = 1 ' 0 for TWI0, 1 for TWI1
#if _build < 20784
Dim ___lcdrow As Byte , ___lcdcol As Byte ' dim these for older compiler versions
#endif
Config Graphlcd = Custom , Cols = 128 , Rows = 64 , Lcdname = "SSD1306"
Cls
Setfont Font8x8tt ' select font
Do
cls
Lcdat 1 , 1 , "BASCOM-AVR"
Lcdat 2 , 10 , "1995-2020"
Lcdat 8 , 5 , "MCS Electronics" , 1
Waitms 1000
Showpic 0 , 0 , Plaatje
Waitms 1000
Loop
End
$include "font8x8TT.font" ' this is a true type font with variable spacing
Plaatje:
$bgf "ks108.bgf" ' include the picture data |
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guyadams
Joined: 22 Nov 2006
Posts: 44
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| Posted: Tue Feb 03, 2026 3:41 pm Post subject: |
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And
| Quote: | Then you can download and test the attached lib.
Same test. NO variable named I2C_ADDR and see if it still works. |
This still works....
Finally
| Quote: | Then the last test would be to create I2C_ADDR and assign it with &H78 BEFORE you use config graphlcd.
It should work too. |
And this works too!
Thank you to all who contributed to fixing this!
Best r
Guy
This is how simple it now is to swap the SSD1306 from TWI port 0 where it might conflict with high ADC channel usage on Port C, to the second hardware TWI on Port E.
| Code: | Config Scl1 = PortE.1 ' used i2c pins
Config Sda1 = PortE.0
Config Twi1 = 400000 ' i2c speed
I2cinit
Const cTWI = 1
$lib "I2c_twi-multi.lib" ' we do not use software emulated I2C but the TWI
$lib "glcdSSD1306-I2C-TWI-option.lib" ' override the default lib with this special one
Dim _i2cchannel as byte
_i2cchannel = 1 ' 0 for TWI0, 1 for TWI1
Dim I2c_addr as byte
I2c_addr = &H78
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guyadams
Joined: 22 Nov 2006
Posts: 44
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| Posted: Tue Feb 03, 2026 3:49 pm Post subject: |
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Here is an image showing there has been and currently is the correct display activity after changing TWI channel. Obviously they are not running concurrently which is where the 2x2 library is used..
 [/img] |
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