DHCOR STM32MP1 Linux

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Linux Userspace Commands

Unsing the internal RTC

Read out the current date

# date

Set a specific system time

# date -s "2020-01-30 10:00:00"

Save the current system time to the RTC of the STM32MP1

# hwclock -w

When you allready have stored a date on the RTC and you want to read it out, use the next command. This command only gives back the time, but does not synchronize it with the system time. This is done in the next step.

# hwclock -r

The system time can be synchronised to the RTC by this command:

# ??????????????????

Unsing the internal RTC

At first the time needs to be set:

Display current time	# date
Change time	# date -s "2020-01-30 10:00:00"

Next save the current time to the internal RTC:

Save the current time to the hardware clock

# hwclock -w

RS-485 on picoITX

RS-485 device

DHCOM UART 2

/dev/ttySTM2

Compilation on target

gcc tty_rs485_test.c -o tty_rs485_test

Set tty device to raw mode

stty -F /dev/ttySTM2 115200 cs8 raw -echo

Send data with demo program

./tty_rs485_test /dev/ttySTM2

Receive data with demo program

./tty_rs485_test /dev/ttySTM2

Download example source code

• tty_rs485_test.c