tldr: I'm trying to re-flash a previously working Adafruit Huzzah ESP8266 breakout module to use the latest AT firmware. The re-flash doesn't seem to be working and I'm getting rather confused. This is the first time I've re-flashed one of these modules.
What I did:
I installed the latest version of esptool.py using pip, and downloaded the latest Espressif AT firmware from github. With the Huzzah on a breadboard I grounded GPIO0 and connected the serial port header to my PC using a FTDI cable. VC on the cable is 5v. The red power light lit. I then ran the following commands:
esptool.py --port COM4 --baud 115200 write_flash -fm dio -fs 32m 0x00000 boot_v1.1.bin
esptool.py --port COM4 --baud 115200 write_flash -fm dio -fs 32m 0x01000 user1.bin
esptool.py --port COM4 --baud 115200 write_flash -fm dio -fs 32m 0x7C000 esp_init_data_default.bin
esptool.py --port COM4 --baud 115200 write_flash -fm dio -fs 32m 0x7E000 blank.bin
Each upload seemed to complete ok, but I found that I couldn't upload the next until I pressed the reset button on the module first, otherwise I got the error:
A fatal error occurred: Failed to connect to Espressif device: Timed out waiting for packet header
This doesn't seem right to me.
After uploading all 4 components as above I disconnected GPIO0 and cycled the power on the module. I then tried connecting using putty at 115200 baud but I get no echo back from the module, and it doesn't respond to commands.
- The module previously worked and I could connect to it with putty.
- If I reset it while connected to putty at 115200, I get a consistent pattern of garbage characters, so my guess is its alive but confused somehow.
- I've tried connecting at various baud rates: 9600, 14400, 19200, 38400, 57600, as well as 115200. Same result.
- I've found walkthroughs that show firmware like node.mcu being uploaded as a single binary. Should I be somehow merging the four bin files into one before uploading the the Huzzah?
What am I doing wrong here?