VERSION 1.9
J120 (38198-X)
MCU command set
mcu --adc
read the 4 voltage rails (power in, 5V, 3.3V, and 1.8V)
mcu --reset
reset TX1/TX2
mcu --poweron power on TX1/TX2
mcu --shutdown power off TX1/TX2
mcu --version
display firmware version
mcu --help
display list of command available
MCU firmware upgrade
The C source code for the MCU is available on request (Attolic TrueStudio project). Please contact us. The MCU
may be programmed with the ST/LINK programming adapter (SWCLK, SWDIO, GND). We recommend the use of
the STM32VLDISCOVERY discovery kit for STM32F100 Value line. It is available in the Auvidea online shop and at
digikey.com (497-10633-ND). To connect to the J120, please remove the 2 CN3 jumpers and connect SWCLK,
SWDIO and GND to the 4 pin CN2 header.
MCU firmware v1.1
This version of the MCU is limited to a UART baud rate of 38400 baud max. Please set the TX1/TX2 to 38400.
Please edit the file /boot/extlinux/extlinux.conf. Please replace 115200n8 by 38400n8.
TIMEOUT 30
DEFAULT primary
MENU TITLE p2371-2180 eMMC boot options
LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
FDT /boot/tegra210-jetson-auvidea-j90.dtb
APPEND fbcon=map:0 console=tty0 console=ttyS0,115200n8
MCU firmware v1.3
This version of the MCU uses the standard baud rate of 115200 baud. The firmware is installed on the J120 rev
7 and newer.
If your use case requires a direct connection to the UART0 of the TX1 and TX2 then there are the following
options:
1. please order a J120 without the MCU populated
2. if you have received a J120 with the MCU populated, the MCU may be bypassed. Please follow the
instructions in Appendix A.
AUVIDEA GMBH
TECHNICAL REFERENCE MANUAL
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