

Bottom side

3.2. Introduction to Functions

3.2.1. The Working Mode of USB Bridge

ESP-Prog uses FT2232HL, which is provided by FTDI, as its USB Bridge Controller chip. The board can

be configured to convert the USB 2.0 interface to serial and parallel interfaces that support a wide

range of industry standards. ESP-Prog uses FT2232HL's default dual-asynchronous serial interface

mode, allowing users to use the board easily by installing the FT2232HL driver on their PCs.

Note: The PC is able to identify the ESP-Prog's two ports by their port numbers. The bigger port

number represents the Program interface, while the other one represents the JTAG interface.

3.2.2. Communication Interface

ESP-Prog can connect to ESP32 user boards, using both the Program interface and the JTAG

interface. Users should connect the user board interfaces in a way that corresponds to the ESP-Prog

board.



Program Interface

The Program interface has six pins, including the UART interface (TXD, RXD), boot mode

selection pin (ESPIO0) and reset pin (ESPEN). The design for the Program interface on the

user board should follow the reference provided in the figure below.