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Update README.md #75

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -276,7 +276,7 @@ Create a `main.cpp` and copy one of the example files into it. Remember to add `

# using FTDI
You will need something like this: https://www.adafruit.com/product/3309
To connect a usb->fdti module to your WVR, connect **D0** to **RX**, **D1** to **TX**, and **GND** to **GND**. Open the sketch examples/wvr_ftdi, where you will see ```wvr->useFTDI = true```. The ESP32 on the WVR needs to be booted into a special FTDI boot mode, to do this, ground **D6** and ground the small copper pad on the top of the WVR labeled "boot" (it's right next to the eMMC), and hit reset. You can release D6 and the boot pad now. The ESP32 is now in FTDI boot mode, and if you have a serial monitor attached the WVR, it should print ```waiting for download```. Now you can use the **UPLOAD** button in the Arduin IDE, at the end of flashing it will print "hard resetting", now restart the WVR. If you open the Arduino Serial Console, you will see some logs form the WVR boot process. With FTDI, you can also use ```./wvr.sh ftdi``` to flash, and Arduino Serial Monitor (or any Serial monitor app you like) to get logs from WVR
To connect a usb->fdti module to your WVR, connect **D0** to **TX**, **D1** to **RX**, and **GND** to **GND**. Open the sketch examples/wvr_ftdi, where you will see ```wvr->useFTDI = true```. The ESP32 on the WVR needs to be booted into a special FTDI boot mode, to do this, ground **D6** and ground the small copper pad on the top of the WVR labeled "TP1" (it's right next to the eMMC), and hit reset. You can release D6 and the boot pad now. The ESP32 is now in FTDI boot mode, and if you have a serial monitor attached the WVR, it should print ```waiting for download```. Now you can use the **UPLOAD** button in the Arduin IDE, at the end of flashing it will print "hard resetting", now restart the WVR. If you open the Arduino Serial Console, you will see some logs form the WVR boot process. With FTDI, you can also use ```./wvr.sh ftdi``` to flash, and Arduino Serial Monitor (or any Serial monitor app you like) to get logs from WVR

# hardware considerations
* **Pin D6** is a "strapping pin" for the ESP32, it corresponds to **GPIO_0** on the ESP32. This is a feature of ESP32 which **cannot be disabled**. If **D6** is held **LOW** at boot by external circuitry, the ESP32 will enter bootloader mode, and the firmware will not run, it will wait for upload until reset.
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