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rogersan
Regular Member

Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 06:02pm 08 Apr 2016

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I have been using a 28 pin Micromite V5.1. Somehow the program has been corrupted so that the Console Tx Data (Pin 11) has become an input. The problem may have bee caused by using

OPTION LCDPANEL ILI9342, L, 2, 23, 6

More than once.

I got an error message

Error: Pin 2 is reserved on start up

Roger Sanderson

Bill.b

Senior Member

Joined: 25/06/2011
Location: Australia
Posts: 235

Posted: 06:18pm 08 Apr 2016

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Hi Roger

Have you tried to reinstall V5.1. I have found this is required if
I have stuffed up the LCD setup.

Bill

In the interests of the environment, this post has been constructed entirely from recycled electrons.

TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6266

Posted: 06:46pm 08 Apr 2016

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Is the display ILI9342 or ILI9341?
As far as I know, MMBasic requires a ILI9341 (but they could be interchangeable)

If you try and configure the LCDPANEL again without OPTION LCDPANEL DISABLE first,
you will get the pin reserved error message.

It doesn't normally cause any major problems.

You could try OPTION RESET to clear all options to their default.

Jim

VK7JH
MMedit

rogersan
Regular Member

Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 08:00pm 08 Apr 2016

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I am using the LCD Backpack board from Silicon Chip.

I tried a V4.6 B without an LCD display, to see if I could just get the Console Serial to work. I did get one sign on message but then nothing. Now the Console Tx (Pin 11) on that Micromite has become an input as well. Is the board somehow reprogramming the micromites?

I checked the 3.3 volt supply (from an MCP1700-3302E) with an oscilloscope, it looks clean but there is a rise time of about 300 microseconds. I do not know if this is causing any problems.

rogersan
Regular Member

Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 08:36pm 08 Apr 2016

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The LCD Backpack board from Silicon Chip has a reset switch that connects MCLR (pin 1) to ground (10 k ohm pull up resistor to 3.3 volts). I have been using this reset switch, perhaps this is causing the corruption.

MicroBlocks

Guru

Joined: 12/05/2012
Location: Thailand
Posts: 2209

Posted: 09:01pm 08 Apr 2016

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Check the capacitor at the VCAP pin. This is often the culprit of unexpected behavior.

Microblocks. Build with logic.

TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6266

Posted: 09:01pm 08 Apr 2016

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The reset shouldn't be a problem.

Can you check that there isn't an open circuit in the Tx line from the processor to the terminal. That's more likely than a corrupted chip.

The other common problem is with the capacitors.

Jim

VK7JH
MMedit

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