First, thanks for dedicated time; I saw You have edited the posts many times. And even You have prepered the hardware.
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I have made the hardware months ago and I have tested it under arduino with success. I know the I2C address (0x27 it is PFC8574T).
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The LCD_SAINSMART_I2C_2004 work like You said. The booting is a little bit longer (i was wondering if it is the ...end ) but I save about 20% percent of the mem of the anet MOBO - it's great :)
But at the end i have a problem: What really "-1" mean "not use"? If I have not declared (or set -1) some pins then they are not visible for marlin?
At the end: Everything work just flawless :) Thanks again for Your work. I have not make step by step like You wrote but now I understand thet part of marlin and it works:)
...
I have made the hardware months ago and I have tested it under arduino with success. I know the I2C address (0x27 it is PFC8574T).
...
The LCD_SAINSMART_I2C_2004 work like You said. The booting is a little bit longer (i was wondering if it is the ...end ) but I save about 20% percent of the mem of the anet MOBO - it's great :)
But at the end i have a problem: What really "-1" mean "not use"? If I have not declared (or set -1) some pins then they are not visible for marlin?
At the end: Everything work just flawless :) Thanks again for Your work. I have not make step by step like You wrote but now I understand thet part of marlin and it works:)