I got it to work with an old version "AT-Firmware 1.1.0.0" from SDK 1.5.4.

$ esptool --port /dev/ttyUSB0 write_flash --flash_mode dout --flash_freq 26m --flash_size 4MB 0x000000 boot_v1.5.bin 0x001000 512+512/user1.1024.new.2.bin 0x03fc000 esp_init_data_default.bin 0x07e000 blank.bin 0x3fe000 ...

Today I got the bigger Flash-Devices "W25Q32BVSIG":

$ esptool.py --port /dev/ttyUSB0 --baud 115200 flash_id
esptool.py v3.3
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting...
Detecting chip type... ESP8266
Chip ...

Depends on your Terminal Programm, eg. the Arduino Serial Monitor works, but you can't get screen or minicom
to send Line Feed (LF; \n) instead of Carriage Return (CR; \r)

So I use the Arduine IDE or:
minicom --device /dev/ttyUSB0 --baudrate 112500 --noinit

AT Ctrl+M Ctrl+J (no Enter nor Return ...

Thanks for the link, but I don't have nerves left after the "only 5 minutes" to upload already took 3 days, and now also trying to compile.
I ordered bigger Flash devices, to solve the problems and even get more features
Thank you very much !

I tried:
$ esptool.py --port /dev/ttyUSB0 --baud 115200 flash_id
esptool.py v3.3
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: <secret>
Uploading stub...
Running stub...
Stub running...
Manufacturer: 5e
Device: 3214 ...

Same error

Looks better, but with the Settings

--flash_mode dio --flash_freq 80m --flash_size 2MB
0x8000 partition_table/partition-table.bin
0x9000 ota_data_initial.bin
0x0 bootloader/bootloader.bin
0x10000 esp-at.bin
0xF0000 at_customize.bin
0xFC000 customized_partitions/client_ca.bin
0x106000 ...

Hello
The Example shows how to flash an ESP32 and it works with my ESP32 :D
Now I have a few ESP-01 (not "S") and look for the Settings. :?:

Flash is a "T25S80, PB20s8, EE5502" recognised as 8Mbit.

But in v2.2.1.0_esp8266 are no server_cert.bin, server_key.bin, server_ca.bin ?
Do I have to make ...

Hello Q

I guess yes, because I also didn't find anything else.
There is no Library, it's all in Hardware. A Hardware UART that can switch into IrDA Mode by activate the Bit's in the Register.

Got it to work from 5mm up to 3 m with 3.3 Volt and up to 4 m with 5 Volt on the TFDU4101.

Hope that ...

Hello Bob,

I tried it first without any IrDA Code, just a wired serial connection with 5V TTL Levels. (Cross Rx->Tx and vice versa)

As that worked, I set it up with a normal LED to see if there is some activity, then I checked it with an Oscilloscope.

Then I set up the IR-LED with R1 = 100 Ohm ...