Wow, I didn't know this list was still going!
I haven't used this series of LCD display, but I wonder if this link is
of any help?
http://esp8266-projects.org/2015/03/display-time-st7032i-i2c-lcd-display-html/
Colin
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On 04/07/2018 18:41:02, "a...@blueyonder.co.uk [piclist]"
wrote:
>[Attachment(s) <#TopText> from a...@blueyonder.co.uk
[piclist]
>included below]
>
>Has anyone had any experience using the erc802-1 series of serial (i2c)
>lcd modules ?
>
>I have not yet succeeded with getting mine to display anything and any
>suggestions would be most welcome. This is what I am doing -
>
>I am using the power-on reset with the reset input wired to +5v.
>
>In software I wait for about 50ms after switch on, then execute code
>which produces the clock (yellow) and data (blue) signals shown on the
>attached scope screenshot. This sequence is Start, slave address with
>write (01111100), followed by 'getack'.
>
>The getack routine switches the pic sda port to input (porta,4 open
>drain with 10k pullup), reads the sda bit (porta,4) and loops till it
>goes low.
>
>You can see from the scope trace that the data does not go low. The
>state shown on the left of the screen (sck high, sda high) continues
>indefinitely, and the prog hangs up at this point.
>
>I am beginning to wonder whether the module has been damaged. I have
>used the common parallel-data modules a lot, and when they are powered
>up without having been programmed they show a characteristic pattern on
>the screen - you can see the pixels, and some of the characters places
>on the first line appear blocked-out. But my serial module does not
>show this - it remains uniformly illuminated (grey) all over. Any
>ideas ?