Olimex Esp32 EVB¶
The Esp32 EVB device is one of the development board created by Olimex to evaluate the ESP-WROOM-32 module. Based on the ESP32 microcontroller, Olimex ESP32 EVB features 100Mb Ethernet Interface, Bluetooth LE, WiFi, Remote control IR, and CAN connectivity. The device can operate with single LiPo backup battery like UPS as it has an internal LiPo battery charger and a step-up converter. Two relays are also available to switch power appliances on and off.
The internal flash of the ESP32 module is organized in a single flash area with pages of 4096 bytes each. The flash starts at address 0x00000, but many areas are reserved for Esp32 IDF SDK and Zerynth VM. In particular:
|0x00009000||16Kb||Esp32 NVS area|
|0x0000D000||8Kb||Esp32 OTA data|
|0x0000F000||4Kb||Esp32 PHY data|
|0x00110000||1Mb||Zerynth VM (FOTA)|
|0x00290000||512Kb||Zerynth Bytecode (FOTA)|
|0x00310000||512Kb||Free for user storage|
Microcontroller: Tensilica 32-bit Single-/Dual-core CPU Xtensa LX6
Operating Voltage: 3.3V
Input Voltage: 7-12V
Digital I/O Pins (DIO): 36
Analog Input Pins (ADC): 4
Flash Memory: 4 MB
SRAM: 520 KB
Clock Speed: 240 Mhz
Wi-Fi: IEEE 802.11 b/g/n/e/i:
- Integrated TR switch, balun, LNA, power amplifier and matching network
- WEP or WPA/WPA2 authentication, or open networks
Power to the Olimex Esp32 EVB is supplied via the on-board USB Micro B connector or with an external power supply. The power source is selected automatically.
External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or throught the connector for a 3.7/4.2 V Li-Po battery. The adapter can be connected by plugging a 2.1 mm center-positive plug into the device’s power jack. The recommended range for external power supply is 7 to 12 volts.
Connect, Register, Virtualize and Program¶
The Olimex Esp32 EVB comes with a serial-to-usb chip on board that allows programming and opening the UART of the ESP32 module. The CH340 USB to UART chip is also connected to the boot pins of the module, allowing for a seamless virtualization of the device.
Drivers for the CH340 Module can be downloaded here in “Software” section and are needed for Windows and Mac platforms. In Linux systems, the Olimex Esp32 EVB should work out of the box.
For Linux Platform: to allow the access to serial ports the user needs read/write access to the serial device file. Adding the user to the group, that owns this file, gives the required read/write access:
- Ubuntu distribution –> dialout group
- Arch Linux distribution –> uucp group
Once connected on a USB port, if drivers have been correctly installed, the Olimex Esp32 EVB device is recognized by Zerynth Studio. The next steps are:
- Select the Olimex Esp32 EVB on the Device Management Toolbar (disambiguate if necessary);
- Register the device by clicking the “Z” button from the Zerynth Studio;
- Create a Virtual Machine for the device by clicking the “Z” button for the second time;
- Virtualize the device by clicking the “Z” button for the third time.
No user intervention on the device is required for registration and virtualization process
After virtualization, the Olimex Esp32 EVB is ready to be programmed and the Zerynth scripts uploaded. Just Select the virtualized device from the “Device Management Toolbar” and click the dedicated “upload” button of Zerynth Studio.
No user intervention on the device is required for the uplink process.
Firmware Over the Air update (FOTA)¶
The Firmware Over the Air feature allows to update the device firmware at runtime. Zerynth FOTA in the Olimex Esp32 EVB device is available for bytecode and VM.
Flash Layout is shown in table below:
|0x00010000||1Mb||Zerynth VM (slot 0)|
|0x00110000||1Mb||Zerynth VM (slot 1)|
|0x00210000||512Kb||Zerynth Bytecode (slot 0)|
|0x00290000||512Kb||Zerynth Bytecode (slot 1)|
For Esp32 based devices, the FOTA process is implemented mostly by using the provided system calls in the IDF framework. The selection of the next VM to be run is therefore a duty of the Espressif bootloader; the bootloader however, does not provide a failsafe mechanism to revert to the previous VM in case the currently selected one fails to start. At the moment this lack of a safety feature can not be circumvented, unless by changing the bootloader. As soon as Espressif relases a new IDF with such feature, we will release updated VMs.
Not all IDF features have been included in the Esp32 based VMs. In particular the following are missing but will be added in the near future:
- BLE support
- Touch detection support
- Real time clock support
- Watchdog support (however, global watchdog is active by default)