Maple Mini, HD44780 with I2C don't work :(

[espruino-discuss3]

Posted at 2016-05-19 by dem9968

Hi!

I have chinese copy of Maple Mini with Espruino firmware 1v85.134. I'm trying to connect the LCD HD44780 with I2C (PCF8574T) and get and get the error :(

Wiring LCD -> Maple Mini:
GND -> GND
VCC -> Vcc
SDA -> PIN 15 (I2C1 SDA)
SDL -> PIN 16 (I2C1 SDL)

Code:

I2C1.setup({scl:B6, sda:B7});
var lcd = require("HD44780").connectI2C(I2C1);
lcd.print("Hello World!");

Error:

1v85.134 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
echo(0);
ERROR: Pin A2 is not capable of I2C1 SCL
Suitable pins are:
A12 undefined�(AF)
Uncaught Error: I2C device not responding
at line 2 col 13
g|4,g|4,g,g])
in function "a" called from line 1 col 7
a(51,1);a(50,1);a(40,1);a(12,1);a(6,1);a(1,1);return{write:a...
in function "h" called from line 2 col 15
g|4,g|4,g,g])})
in function "connectI2C" called from line 1 col 45
var lcd = require("HD44780").connectI2C(I2C1);
Uncaught Error: Field or method "print" does not already exist, and can't create it on undefined
at line 1 col 4
lcd.print("Hello World!");
=undefined

[espruino-discuss3]

Posted at 2016-05-19 by @gfwilliams

I think it's because the Maple uses a different set of pin names to the actual STM32 pins. You'd need to use D0..D33 (I think) - the mapping is this one: https://github.com/espruino/Espruino/blob/master/boards/MAPLEMINI.py#L63-97

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Posted at 2016-05-19 by dem9968

I tried to use I2C1.setup({scl:D16, sda:D15})... PD16 and PD15; P16 and P15; PB6 and PB7...
these values result in an error:

Uncaught ReferenceError: "PIN" is not defined

where PIN is D16, PD16, P16, PB6...