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Flash problems to ESP8266 boards
Note to self: sometimes I cannot write to ESP8266 boards. The solution appeared to be to disconnect serial devices first (e.g. MH-Z19B), then flash
Or use Arduino 'Serial logger'. Use baud 74880 for boot loader, 115200 for programs running on the board (in my case). This gave me:
Once I found the board was running Micropython (i.e. ruling out HW problem), I found that I could connect but not write to the Micropython prompt.
Symptoms
- Typically freshly bought boards (Wemos D1 mini Pro) running micropython
- esptool.py reports: A fatal error occurred: Failed to connect to Espressif device: Timed out waiting for packet header
- Arduino reports: error: espcomm_open failed error: espcomm_upload_mem failed
- Cannot interact or write to Micropython REPL prompt, commands are not fed back (i.e. I only have RX no TX capability)
Diagnosing ESP8266 boards
To see what the board is doing, connect to USB, then run screen on the tty:
screen /dev/tty.usbserial-1420 {74880,115200}
Or use Arduino 'Serial logger'. Use baud 74880 for boot loader, 115200 for programs running on the board (in my case). This gave me:
21:32:09.624 -> OSError: [Errno 2] ENOENT 21:32:09.624 -> 21:32:09.624 -> MicroPython v1.9.4-8-ga9a3caad0 on 2018-05-11; ESP module with ESP8266 21:32:09.624 -> Type "help()" for more information. 21:32:09.624 -> >>>
Once I found the board was running Micropython (i.e. ruling out HW problem), I found that I could connect but not write to the Micropython prompt.
Solution
In my case the problem appeared to be that a sensor using the serial port blocked my input to the serial port for uploading. Disconnecting the sensor worked. HTH.Infrared remote control hell with an Intel NUC, Logitech Harmony, lirc, ir-keymap and Kodi
So I got a new (second hand) Harmony Remote and would like to control my AV setup with this. I document my findings in the jungle of IR control on Linux here.
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- Old situation: Kodi (on Intel NUC/Ubuntu 18.04) controlled via LIRC using Apple TV remote
- Desired situation: Samsung TV + Pioneer AV receiver + Kodi on NUC controlled with Logitech Harmony and Kodi also with the Apple TV remote.
- Harmony remote controls all devices
- AppleTV and Harmony can both navigate Kodi
- Harmony shuts down Kodi and NUC
- Kodi doesn't detect all keys from Apple TV remote (e.g. KEY_OK / KEY_MENU / KEY_BACKSPACE). Workaround: use KEY_DELETE and remap in Kodi's keyboard.xml
- Why does evtest show two IR event inputs?
- Why does Kodi have multiple keymaps?
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