programming : jtag2updi VS SerialUPDI #1145
PM04290
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0x1E 0x94 0x21 is an ATtiny1616 Now the question is, which one do you expect to have and which one is on the board? |
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It's so obvious.... |
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I usually use jtag2updi to program the attiny and it works perfectly; for a particular project I will have to program the ATtiny with an ESP32, my first attempts with the Adafjuit AVRprog library did not work, I wanted to check that my wiring was correct, so I tried with a SerialUPDI programmer via a USB module based on CH340; nothing works and none of the programmer configurations work.
I tried several resistance values, with or without diode. Currently, the best result is with a simple 1K resistor between TX and RX. I operate in 3.3v on both sides. below is the trace of what I can have at best... I don't know where to look anymore.
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