DESK-MP1-L/Peripherals/GPIOs
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| 02/08/2023 | DESK-MP1-L-1.0.0 release | ||
Peripheral GPIOs[edit | edit source]
In ETRA SOM there is an I/O Expander driven via i2c, with this ETRA can handle external pins in many different ways and most of them can be configured as GPIOs, these GPIOs are present in the J11 connector.
There is no driver to configure and use these GPIOs, to configure and write/read the GPIOs you need to interact with I/O expander with i2c commands.
Accessing the peripheral[edit | edit source]
Usage with i2c command[edit | edit source]
Set all GPIO on output mode, all pin low
root@desk-mp1:~# i2cset -y 1 0x34 0x30 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x31 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x32 0x07
set all pin to high, one by one
root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x01 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x02 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x04 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x08 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x10 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x20 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x40 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x80 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x01 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x02 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x04 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x08 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x10 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x20 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x40 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x80 root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x01 root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x02 root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x04
set all pin to high and set all to low one by one
root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x07 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xfe root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xfd root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xfb root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xf7 root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xef root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xdf root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xbf root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0x7f root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xfe root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xfd root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xfb root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xf7 root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xef root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xdf root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0xbf root@desk-mp1:~# i2cset -y 1 0x34 0x2b 0x7f root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x06 root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x05 root@desk-mp1:~# i2cset -y 1 0x34 0x2c 0x03
set gpio input mode, disable debounce
root@desk-mp1:~# i2cset -y 1 0x34 0x30 0x00 root@desk-mp1:~# i2cset -y 1 0x34 0x31 0x00 root@desk-mp1:~# i2cset -y 1 0x34 0x32 0x00 root@desk-mp1:~# i2cset -y 1 0x34 0x27 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x28 0xff root@desk-mp1:~# i2cset -y 1 0x34 0x29 0x07
Read input value
root@desk-mp1:~# i2cget -y 1 0x34 0x16 root@desk-mp1:~# i2cget -y 1 0x34 0x17 root@desk-mp1:~# i2cget -y 1 0x34 0x18
