DESK-MP1-L/Peripherals/GPIOs
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| 2023/08/02 | DESK-MP1-L-1.0.0 release | ||
Peripheral GPIOs[edit | edit source]
In ETRA SOM there is an I2C I/O Expander: in this way, ETRA can handle several pins in different ways and most of them can be configured as GPIOs. These GPIOs are available in J11 connector.
To configure and write/read the GPIOs you need to configure the I/O expander via I2C commands.
Accessing the peripheral[edit | edit source]
Usage with I2C command[edit | edit source]
Set all GPIO on output mode, all pins 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
