Problem while Program ATTINY804 using USB-to-UART Device.

[krishank652]

Dear All,

I am trying to program ATTINY804 using CP2102(6-pin) USB 2.0 to TTL UART serial converter

CP2102 Adapter                           ATtiny804 MCU
+----------------+                      +-------------------------+
|                |                      |                         |
|    TX o--------+---[3.3 kΩ]---+------> UPDI                    | 
|                |              |       |                         |
|    RX o--------+--------------+       |                         |
|                |                      |                         |
|   GND o-------------------------------> GND                     |
|                |                      |                         |
|   VCC o-------------------------------> VCC                     |
|                |                      |                         |
+----------------+                      +-------------------------+

But still failed to upload my code in ATTINY804. Please tell me what thing I am missing.

Showing Error in Arduino IDE:

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "ATtiny3224/1624/1614/1604/824/814/804/424/414/404/214/204, ATtiny804, 20 MHz internal, 1.8V (5 MHz or less), Disabled/Disabled, EEPROM retained, Enabled (default timer), 8ms, Master or Slave (saves flash and RAM), Default (doesn't print floats, 1.4k flash use), PB0-2, PA3-5 (default), On all pins, with new implementation., Disabled (recommended), No delay before window "opens""

Sketch uses 4640 bytes (56%) of program storage space. Maximum is 8192 bytes.

Global variables use 142 bytes (27%) of dynamic memory, leaving 370 bytes for local variables. Maximum is 512 bytes.

avrdude: jtagmkII_getsync(): bad response to sign-on command: Unknown JTAG ICE mkII result code 0x01

An error occurred while uploading the sketch



This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

[hmeijdam]

You should use one of the SerialUPDI upload options, not the jtag2updi one.

[krishank652]

Dear @hmeijdam ,

I tried all available option of SerialUPDI. But still failed to upload code in ATTiny-804.

Available options are:

Can you tell me which option I need to choose for upload?

[hmeijdam]

Take the SerialUPDI - SLOW 57600 first. That one is least sensitive to imperfect hardware.

If that does not work I suggest you change your series resistor from 3.3K to something like 470 Ohm. So MUCH lower than 3.3K.

[krishank652]

Thanks, I added 1K Resistance instead of 3.3K. Its work for me.

Take the SerialUPDI - SLOW 57600 first. That one is least sensitive to imperfect hardware.