Difference between revisions of "DESK-MP1-L/Peripherals/GPIOs"
(Created page with "==Peripheral GPIOs == ETRA can handle external pins in many different ways and most of them can be configured as GPIOs. When a pin is set as a GPIO, it is possible to read it...") |
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| + | <section begin=History/> | ||
| + | {| style="border-collapse:collapse; " | ||
| + | !colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History | ||
| + | |- | ||
| + | !style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue Date | ||
| + | !style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes | ||
| + | |- | ||
| + | |style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|2023/08/02 | ||
| + | |style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|DESK-MP1-L-1.0.0 release | ||
| + | |- | ||
| + | |} | ||
| + | <section end=History/> | ||
| + | <section begin=Body/> | ||
| + | |||
==Peripheral GPIOs == | ==Peripheral GPIOs == | ||
| − | ETRA can handle | + | In [[ETRA_SOM | 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 === |
| − | Set all GPIO on output mode, all | + | ==== Usage with I2C command ==== |
| + | |||
| + | Set all GPIO on output mode, all pins low: | ||
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
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</pre> | </pre> | ||
| − | + | Set all pin to high, one by one: | |
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
| Line 40: | Line 55: | ||
</pre> | </pre> | ||
| − | + | Set all pin to high and set all to low one by one: | |
| + | |||
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xff | root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xff | ||
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</pre> | </pre> | ||
| − | + | Set GPIO input mode, disable debounce: | |
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
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</pre> | </pre> | ||
| − | Read input value | + | Read input value: |
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
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root@desk-mp1:~# i2cget -y 1 0x34 0x18 | root@desk-mp1:~# i2cget -y 1 0x34 0x18 | ||
</pre> | </pre> | ||
| + | |||
| + | ---- | ||
| + | |||
| + | [[Category:ETRA]] [[Category:ETRA_SBC]] | ||
Latest revision as of 11:14, 8 January 2024
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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
