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espat: add README with information on how to flash ESP32 or ESP8266 with AT command set firmware.

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-06-26 11:23:38 +02:00
parent 59aece351a
commit 40d9287ac4
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espat/README.md
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# ESP-AT Driver
This package provides a driver to use a separate connected WiFi processor either the ESP8266 or the ESP32 from Espressif.
The way this driver works is by using the UART interface to communicate with the WiFi chip using the Espressif AT command set.
## ESP-AT Firmware Installation
In order to use this driver, you must have the ESP-AT firmware installed on the ESP8266/ESP32 chip.
### Installing on ESP32
The official repository for the ESP-AT for the ESP32 processor is located here:
https://github.com/espressif/esp32-at
Your best option is to follow the instructions in the official repo.
### Installing on ESP8266
The official repository for the AT command set firmware for the ESP8266 processor is located here:
https://github.com/espressif/ESP8266_NONOS_SDK
First clone the repo:
```shell
git clone https://github.com/espressif/ESP8266_NONOS_SDK.git
```
You will also need to install the Espressif `esptool` to flash this firmware on your ESP8266:
https://github.com/espressif/esptool
Once you have obtained the binary code, and installed `esptool`, you can flash the ESP8266.
Here is an example shell script that flashes a Wemos D1 Mini board:
```python
#!/bin/sh
SPToolDir="$HOME/.local/lib/python2.7/site-packages"
FirmwareDir="$HOME/Development/ESP8266_NONOS_SDK"
cd "$SPToolDir"
port=/dev/ttyUSB0
if [ ! -c $port ]; then
port=/dev/ttyUSB0
fi
if [ ! -c $port ]; then
echo "No device appears to be plugged in. Stopping."
fi
printf "Writing AT firmware to the Wemos D1 Mini in 3..."
sleep 1; printf "2..."
sleep 1; printf "1..."
sleep 1; echo "done."
echo "Erasing the flash first"
esptool.py --port $port erase_flash
esptool.py --port /dev/ttyUSB0 --baud 115200 \
write_flash -fm dio -ff 20m -fs detect \
0x0000 "$FirmwareDir/bin/boot_v1.7.bin" \
0x01000 "$FirmwareDir/bin/at/512+512/user1.1024.new.2.bin" \
0x3fc000 "$FirmwareDir/bin/esp_init_data_default_v05.bin" \
0x7e000 "$FirmwareDir/bin/blank.bin" \
0x3fe000 "$FirmwareDir/bin/blank.bin"
echo "Check the boot by typing: miniterm $port 74800"
echo " and then resetting. Use Ctrl-] to quit miniterm."
```