ATTiny2313/4313 Flowcode development board

[mnfisher]

I made a small ATTiny4313 dev board. The MCI can run at up to 20MHz (or 8MHz internal)

I breadboarded and it worked well, although the connection to the programmer was a little 'delicate'

So using an ElectroCookie solderable breadboard i set to make a version with an ICSP header.

This entailed cutting three tracks - and i also added a jumper to allow external power. Originally i had a 10K pull up resistor to pin 1 (reset) bit I removed, when testing failed. It seems okay on the internal pull-up but might be good to re-add.

PXL_20260527_133639488.MP~2.jpg (212.32 KiB) Viewed 186 times

[mnfisher]

I had most difficulty soldering the header pins - some melting has occurred on my VCC jumper

I hit two problems - it didn't work ( a biggy) - i checked the board carefully and I hadn't bridged the links in the power/ground rails..

Still no joy - and attaching a scope, I see that reset doesn't pull low. I removed the 10K resistor

Programming the chip separately (I knew the socket was a good idea) convinced me that the MCU was running okay (blinkie) - so I checked the wiring again!

Then I noticed that I had plugged the programmer cable into the UDP port - doh..

I wrote a small batch file for Flowcode (I used a Diamex programmer) - and all works well....

I'll post after I've polished it a bit... FC doesn't allow a USB port to be specified for ATTiny chips - and hardcoding it seems excessive ('USB' doesn't do it)

So I'll peek at the definition file (and maybe get some pointers from Steve?) to allow this to be set!

Martin

[mnfisher]

... and I forgot to connect VCC to pin 20...

Which took rather longer to notice than you'd hope

[Steve-Matrix]

Ben is more familiar with that part of FCD files than I am, but I think it's one or both of these 2 sections you need to pay attention to:

The first is the use of the batch files and the "UsesComm" and "$(comport)" of the <programmer> section within <build>.

The second is the <comminfo> entries which allow you to specify a VID/PID pairing

[mnfisher]

I think I'm almost there - I created a fcd file AT4313_Dev_Board - and copied across the 'programmer' lines from a device that has a COM port (I used Arduino Uno) - this seems good - with the proviso that 'upload configuration now' gives fuse memory is undefined. I've not altered the fuse settings - and only one byte is offered in configuration. Should there be a H(igh) and a L(ow) byte?

Martin

[Steve-Matrix]

Sorry, I don't know about this particular chip. But the "E-Blocks2 AVR Programmer" fcd might hold a clue. This one has the following section and maybe you need something similar:

Code: Select all

    <configuration address='0x0000' mult='1' progonly='1' >
        <format><byte address='Low' value='0xFF' /><byte address='High' value='0xDF' /><byte address='Extended' value='0xFF' /></format>
        <setting />
        <settings >
            <setting name='SUT_CKSEL' offset='0' mask='63' bits='6' hint='Select Clock Source' >
                <option name='Ext. Clock, Start-up time PWRDWN/RESET: 6 CK/14 CK + 0 ms' value='0' />
                <option name='Ext. Clock, Start-up time PWRDWN/RESET: 6 CK/14 CK + 4.1 ms' value='16' />

                ...etc...

[mnfisher]

Thanks, I'll have another rummage through the fcd files.

It all seems to work quite smoothly for programs which is good.

Auto-detect doesn't pick the com port, but manually selecting it is fine. Using a long name looks a bit odd on the 'quick start' buttons - so a better name is needed.

Martin