ITE IT8XXX2 series
The IT8XXX2 is a 32-bit RISC-V Micro-controller. And a highly integrated embedded controller with system functions. It is suitable for mobile system applications. The picture below is the IT81302 MECC board (also known as it8xxx2_evb) and its debug card.
The IT8XXX2 series contains different chip types(ex, it81302, it83202), and they support different hardware features. Listing the IT81302 hardware features as following:
RISC-V RV32IMAFC instruction set
4KB instruction cache size
60KB SDRAM in total
Built-in 32.768 kHz clock generator
PWM, eSPI, LPC, FLASH, UART, GPIO, Timer, Watchdog, ADC, JTAG
6 SMBus channels, with 3 DMA controllers, compatible with I2C
USB Type-c CC Logic
USB Power Delivery
Support KB scan
currently supports the following hardware features:
Other hardware features are not currently supported by Zephyr.
The default configuration can be found in the boards/riscv/it8xxx2_evb/it8xxx2_evb_defconfig Kconfig file.
Before using the it8xxx2_evb, some hardware rework is needed. The HW rework guide can be found in ITE’s website. https://www.ite.com.tw/uploads/product_download/IT81302_MECC_Rework_Guide_0927.pdf
Programming and debugging on it83202
Connect the Download Board to your host computer using the USB cable.
Connect the it8xxx2_evb to your host computer or a 5V1A USB power supply.
Connect the Download Board J5 to J8 on the it8xxx2_evb board.
Connect the USB to UART wire to it8xxx2_evb.
Be careful during connection! Use separate wires to connect I2C pins with pins on the it8xxx2_evb board. Wiring connection is described in the table below.
it8xxx2_evb J8 Connector
For USB to UART cable, connect the it8xxx2_evb as below:
USB to UART cable
it8xxx2_evb J5 Connector
Use the winflash tool to program a zephyr application to the it8xxx2 board flash.
Open winflash tool and make sure the order you open the switch is right. Fisrt, turn on the Download board switch. Second, turn on the it8xxx2_evb board switch. Then, configure your winflash tool like below.
Using winflash tool flash zephyr.bin into your ITE board. First, click
Loadbutton and select your zephyr.bin file. Second, click
runto flash the iamge into board.
At this point, you have flashed your image into ITE board and it will work if you turn on ITE board. You can use a terminal program to verify flashing worked correctly.
For example, open device manager to find the USB Serial Port(COM4) and use your terminal program to connect it(Speed: 115200).
Turn on the it8xxx2_evb board switch, you should see
"Hello World! it8xxx2_evb"sent by the board. If you don’t see this message, press the Reset button and the message should appear.
Run your favorite terminal program to listen for output. Under Linux the terminal should be
/dev/ttyUSB0. Do not close it.
$ minicom -D /dev/ttyUSB0 -b 115200
Open a second terminal window and use linux flash tool to flash your board.
$ sudo ~/itetool/ite -f build/zephyr/zephyr.bin
The source code of ITE tool can be downloaded here: https://www.ite.com.tw/uploads/product_download/itedlb4-linux-v106.tar.bz2
Split first and second terminal windows to view both of them. You should see
"Hello World! it8xxx2_evb"in the first terminal window. If you don’t see this message, press the Reset button and the message should appear.
Supporting uart debug, currently.
If the flash tool reports a failure, re-plug the 8390 Download board or power cycle the it8xxx2_evb board and try again.