UPDI

Duval JP · Joined: 22 Jun 2004 Posts: 1191 Location: France

Hi
It's is working well for me : CP2102n VCC=5V with filtering/decoupling capacitors 1µf and 10nF

And

and

JP

ulfbc · Joined: 12 Mar 2019 Posts: 23

albertsm · Joined: 09 Apr 2004 Posts: 6125 Location: Holland

JP that is the AVRX series which can work on higher baud.
the xtiny is limited to 900 KHz. so i suggest 115200 baud first.
the protection resistor can be 1K. but only function is to protect the TX.

the voltage is also important. try 5V if possible.
and then of course : is the usb power used to power the circuit?
do all gnd and vcc have a connection?
you best provide more details. cp2102 works best for me.

my timeout is 30.

for the best hardware : get yourself a SNAP programmer from Microchip, it will be supported in the next update.

ulfbc · Joined: 12 Mar 2019 Posts: 23

now works fine with a FTDI232 Adapter

thanks to Przemek, JP and Marc

Regards
Ulf

ps:
and with CP2102 Adapter as well.

Both wit 1K Resistor between TX and TX

ulfbc · Joined: 12 Mar 2019 Posts: 23

The CP2102 is flashing faster. Both driven with 225kBd.

EDC · Joined: 26 Mar 2014 Posts: 1094

albertsm · Joined: 09 Apr 2004 Posts: 6125 Location: Holland

did not know. but for microchip they are the same. i do not see how i could get such a new pcb v2 to test?
does this snap has a different usb product id?
well my implementation should work anyway. i wonder about the resistor too. you still need to remove a resistor ? (forgot which one it was)

matjazs · Joined: 08 Nov 2016 Posts: 99

I bought this UPDI programmer
5893 Voltage UPDI Friend - USB Serial UPDI Programmer ESP32
https://vi.aliexpress.com/item/1005008126747614.html?spm=a2g0o.order_list.order_list_main.4.436c18020T4uHa&gatewayAdapt=glo2vnm

and tried to program my

programmista123 · Joined: 31 Jan 2018 Posts: 177

Hi,

Could you share programmer options screenshot?
Do you have any errors?

Duval JP · Joined: 22 Jun 2004 Posts: 1191 Location: France

interesting.

but is it faster than programming with a CP2102?

jp Wink

EDC · Joined: 26 Mar 2014 Posts: 1094

CH340 is not a speed demon Very Happy

but it is nomather if it is faster.
When you lock AVR with UPDI you need a 12V pulse to unlock it.
I think even SNAP cant do that.

On the shop site there is a link to oryginal design for this tool so I read documentation. 12V pulse is controlled by RTS signal. It must be low to drive PNP transistor.
Bascom can handle both DTR and RTS signals but only DTR can be inverted as option.
I dont know on which state is RTS signal "normally".
Maybe there is a permanent low state and this tool inject 12V over that PNP transistor so communication cannot be established.

Regardless I order one this little baby for tests Very Happy

matjazs · Joined: 08 Nov 2016 Posts: 99

JC · Joined: 15 Dec 2007 Posts: 616 Location: Cleveland, OH

Above Mark asked about the SNAP V1 and V2 VIDs.

I have both SNAP versions.
The new SNAP V2 has a small 3-Pin header on the SNAP PCB.
It is seen in the photo below, just below the microcontroller chip.
Shorting 1 and 2 is for PICs.
Shorting 2 and 3 is for AVRs.

I've used my SNAP V2 for SPI so far, but I've not yet tested it on an Xmega (PDI), or a UPDI chip.

When I plug the V1 and V2 SNAPs into my Windows PC, I see the following VID info in the Device Manager.

The LEFT info is V2, the RIGHT info is the V1 SNAP.

(The 3D case file / design was on Thingiverse, by ariz0na.)

JC

EDC · Joined: 26 Mar 2014 Posts: 1094

Okay, I got it today. I order it from linked store to be precise.
It is funny for me that it comes with three pin connector JST on the board and four pin plug ahahahaha. So the plug with the wires are useless.

Nomather that I solder a golpin connector (not attached) and connect it to my AVR128DB32 because it is the shortest way to me with this board.
Everything looks like working fine. I can connect and read FuseBits.

I will check the 12V function later.

Please check your connections if you have problem with this adapter. It is working for me.

EDC · Joined: 26 Mar 2014 Posts: 1094

Okay, I test it because Im curious about everything from the birth.

Bascom doing this well. Voltage stays at 5V with this tool.
Only when you config a RTS signal as HV programm then pulse is present at the begining of the sequence.
I set trigger (on oscilloscope) above 5V and rest of communication is 5V-0V shorting to ground.

Now I see that I measure something last time x1 not x10 probe today (This is my fault but not the case here).