Introduction To The ESP-Prog Board
Introduction to the ESP-Prog Board1. OverviewESP-Prog is one of Espressif’s development and debugging tools, with functions including automaticfirmware downloading, serial communication, and JTAG online debugging. ESP-Prog's automaticfirmware downloading and serial communication functions are supported on both the ESP8266 andESP32 platforms, while the JTAG online debugging is supported only on the ESP32 platform.ESP-Prog can easily connect to a PC with the use of only one USB cable. Then, the PC can identify theboard's downloading and JTAG interfaces (functions) by their port numbers.Given that the power supply voltage may vary on different user boards, either of the ESP-Proginterfaces can provide the 5V or the 3.3V power supply through pin headers, in order to ensurepower compatibility.2. System DiagramESP-Prog's overall functional block diagram is displayed below:
3. Hardware IntroductionThe figure below describes the areas of each function on the ESP-Prog board.3.1. PCB Layout and DimensionsESP-Prog's PCB layout is displayed below, showing the board's dimensions and its interfacemarkings. Please refer to Espressif website for the hardware resources including schematics, PCBreference design, BOM and other files. Top side
Bottom side3.2. Introduction to Functions3.2.1. The Working Mode of USB BridgeESP-Prog uses FT2232HL, which is provided by FTDI, as its USB Bridge Controller chip. The board canbe configured to convert the USB 2.0 interface to serial and parallel interfaces that support a widerange of industry standards. ESP-Prog uses FT2232HL's default dual-asynchronous serial interfacemode, 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 portnumber represents the Program interface, while the other one represents the JTAG interface.3.2.2. Communication InterfaceESP-Prog can connect to ESP32 user boards, using both the Program interface and the JTAGinterface. Users should connect the user board interfaces in a way that corresponds to the ESP-Progboard. Program InterfaceThe Program interface has six pins, including the UART interface (TXD, RXD), boot modeselection pin (ESPIO0) and reset pin (ESPEN). The design for the Program interface on theuser board should follow the reference provided in the figure below.
JTAG InterfaceThe design for the JTAG interface on the user board should follow the reference provided inthe figure below. Fool-proof DesignThe ESP-Prog board uses header connectors (DC3-6P / DC3-10P) which support reversecurrent circuitry protection. In such cases, it is recommended that users also use headerconnectors on their user boards, such as FTSH-105-01-S-DV-* or DC3-*P.Note: The flat cables used here are directional. Please use the cables provided by Espressif.3.2.3. Automatic Downloading FunctionESP-Prog supports automatic downloading. After connecting the Program interface of ESP-Prog tothe user board, the downloading program can download data or run programs automatically bycontrolling the states of the start-mode selection pin (ESPIO0) and reset pin (ESPEN), which sparesthe users from manually restarting the device and selecting the downloading modes. The twobuttons on the ESP-Prog board enable users to reset and control the boot mode of the devicemanually.The schematics of the automatic downloading circuit is displayed below.
3.2.4. Delay CircuitThe delay circuit of ESP-Prog includes the bus buffer, inverter, MOS tube, first-order RC circuit, andother components. This delay circuit ensures that the ESP32 chip can power up or reset itself, beforeconnecting with the JTAG signal, thus protecting the chip from the influence of JTAG on power-up orreset.3.2.5. LED Status Indication The red LED lights up when the system is connected to the 3.3V power;The green LED lights up when ESP-Prog is downloading data to ESP32;The blue LED lights up when ESP-Prog is receiving data from ESP32.3.2.6. Pin HeadersUsers can choose either the 3.3V or 5V power supply for the Program and JTAG interfaces, using thepin headers shown in the figure below.
Pin header to select power supplyThe pin header in the middle is the power input pin for each interface. When this pin isconnected to 5V, the power output of the interface is 5V. When this pin is connected to 3.3V,the power output of the interface is 3.3V. IO0 On/Off PinPin IO0 can be set to select ESP8266's and ESP32's boot modes. This pin can be used as acommon GPIO, after the chip is powered on. Users can then disconnect Pin IO0 manually toprotect the operation of the user board from the influence of ESP-Prog's automaticdownloading circuit.4. Step by Step Instruction1. Connect the ESP-Prog board and the PC USB port via a USB cable.2. Install the FT2232HL chip driver on your PC. The PC then detects the two ports of ESP-Prog,indicating that the driver has been installed successfully.3. Select the output power voltage for the Program / JTAG interfaces, using pin headers.4. Connect the ESP-Prog and ESP user boards with the gray flat cables provided by Espressif.5. Start automatic downloading or JTAG debugging, using the official software tools or scriptsprovided by Espressif.5. Useful Links Espressif's Official Website How to buy: espressif systems (WeChat Account), Purchase consulting ESP-Prog schematics, PCB reference design, BOM Introduction to the ESP32 JTAG Debugging Flash Download Tools (ESP8266 & ESP32) FT2232HL Chip ution/blob/master/documents/evaluation boards/ESP‐Prog guide en.md/621‐19
2. Install the FT2232HL chip driver on your PC. The PC then detects the two ports of ESP-Prog, indicating that the driver has been installed successfully. 3. Select the output power voltage for the Program / JTAG interfaces, using pin headers. 4. Connect the ESP-Prog and ESP user boards with the gr
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