Difference between revisions of "ROM-6881 How to use GPIO"
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Xingxing.li (talk | contribs) (Created page with " = Configuration = The RK3588 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" The numeric value of GPIO is calculated as foll...") |
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== ROM-6881 == | == ROM-6881 == | ||
| − | {| border="1" cellpadding="1" cellspacing="1" | + | {| border="1" cellpadding="1" cellspacing="1" style="width: 411px;" |
|- | |- | ||
| GPIO Number | | GPIO Number | ||
| − | | GPIO formed | + | | style="width: 123px;" | GPIO formed |
| − | | Numeric Representation | + | | style="width: 186px;" | Numeric Representation |
|- | |- | ||
| GPIO0 | | GPIO0 | ||
| − | | Ext-GPIO0 P00 | + | | style="width: 123px;" | Ext-GPIO0 P00 |
| − | | 493 | + | | style="width: 186px;" | 493 |
|- | |- | ||
| GPIO1 | | GPIO1 | ||
| − | | Ext-GPIO0 P01 | + | | style="width: 123px;" | Ext-GPIO0 P01 |
| − | | 494 | + | | style="width: 186px;" | 494 |
|- | |- | ||
| GPIO2 | | GPIO2 | ||
| − | | Ext-GPIO0 P02 | + | | style="width: 123px;" | Ext-GPIO0 P02 |
| − | | 495 | + | | style="width: 186px;" | 495 |
|- | |- | ||
| GPIO3 | | GPIO3 | ||
| − | | Ext-GPIO0 P03 | + | | style="width: 123px;" | Ext-GPIO0 P03 |
| − | | 496 | + | | style="width: 186px;" | 496 |
|- | |- | ||
| GPIO4 | | GPIO4 | ||
| − | | Ext-GPIO0 P04 | + | | style="width: 123px;" | Ext-GPIO0 P04 |
| − | | 497 | + | | style="width: 186px;" | 497 |
|- | |- | ||
| GPIO5 | | GPIO5 | ||
| − | | GPIO4_B5 | + | | style="width: 123px;" | GPIO4_B5 |
| − | | 141 | + | | style="width: 186px;" | 141 |
|- | |- | ||
| GPIO6 | | GPIO6 | ||
| − | | Ext-GPIO0 P05 | + | | style="width: 123px;" | Ext-GPIO0 P05 |
| − | | 498 | + | | style="width: 186px;" | 498 |
|- | |- | ||
| GPIO7 | | GPIO7 | ||
| − | | Ext-GPIO0 P06 | + | | style="width: 123px;" | Ext-GPIO0 P06 |
| − | | 499 | + | | style="width: 186px;" | 499 |
|- | |- | ||
| GPIO8 | | GPIO8 | ||
| − | | Ext-GPIO0 P07 | + | | style="width: 123px;" | Ext-GPIO0 P07 |
| − | | 500 | + | | style="width: 186px;" | 500 |
|- | |- | ||
| GPIO9 | | GPIO9 | ||
| − | | GPIO4_A0 | + | | style="width: 123px;" | GPIO4_A0 |
| − | | 128 | + | | style="width: 186px;" | 128 |
|- | |- | ||
| GPIO10 | | GPIO10 | ||
| − | | GPIO3_C0 | + | | style="width: 123px;" | GPIO3_C0 |
| − | | 112 | + | | style="width: 186px;" | 112 |
|- | |- | ||
| GPIO11 | | GPIO11 | ||
| − | | GPIO3_C1 | + | | style="width: 123px;" | GPIO3_C1 |
| − | | 113 | + | | style="width: 186px;" | 113 |
|} | |} | ||
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Here we take GPIO0 of ROM-6881 as an example. | Here we take GPIO0 of ROM-6881 as an example. | ||
| − | Export GPIO then you can use control GPIO from userr space through sysfs | + | Export GPIO then you can use control GPIO from userr space through sysfs. |
Export GPIO0 | Export GPIO0 | ||
| Line 85: | Line 85: | ||
Set GPIO value 0/1 if GPIO pin define is output | Set GPIO value 0/1 if GPIO pin define is output | ||
<pre># echo 1 > /sys/class/gpio/gpio493/value | <pre># echo 1 > /sys/class/gpio/gpio493/value | ||
| + | </pre> | ||
| + | |||
| + | |||
| + | Unexport GPIO0 | ||
| + | <pre># echo 493 > /sys/class/gpio/unexport | ||
</pre> | </pre> | ||
| Line 98: | Line 103: | ||
*none: Disable interrupt on both edges | *none: Disable interrupt on both edges | ||
| − | + | '''GPIO Test''' | |
| − | |||
| − | |||
| − | + | GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1 | |
| − | + | *'''Export GPIO0 and GPIO1''' | |
| − | |||
| − | |||
| − | *Export GPIO0 and GPIO1 | ||
<pre># echo 493 > /sys/class/gpio/export | <pre># echo 493 > /sys/class/gpio/export | ||
# echo 494 > /sys/class/gpio/export | # echo 494 > /sys/class/gpio/export | ||
</pre> | </pre> | ||
| − | *Set GPIO0 | + | *'''Set GPIO0 to output and GPIO1 to input''' |
<pre># echo "out" > /sys/class/gpio/gpio493/direction | <pre># echo "out" > /sys/class/gpio/gpio493/direction | ||
| + | # echo "in" > /sys/class/gpio/gpio494/direction | ||
</pre> | </pre> | ||
| − | * | + | *'''Change GPIO0 to 1 and read GPIO1 value''' |
| − | |||
| − | |||
| − | |||
| − | |||
<pre># echo 1 > /sys/class/gpio/gpio493/value | <pre># echo 1 > /sys/class/gpio/gpio493/value | ||
# cat /sys/class/gpio/gpio494/value | # cat /sys/class/gpio/gpio494/value | ||
| Line 126: | Line 123: | ||
</pre> | </pre> | ||
| − | *Change GPIO0 to 0 and read GPIO1 value | + | *'''Change GPIO0 to 0 and read GPIO1 value''' |
<pre># echo 0 > /sys/class/gpio/gpio493/value | <pre># echo 0 > /sys/class/gpio/gpio493/value | ||
# cat /sys/class/gpio/gpio494/value | # cat /sys/class/gpio/gpio494/value | ||
0</pre> | 0</pre> | ||
Revision as of 06:44, 3 January 2024
Configuration
The RK3588 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>"
The numeric value of GPIO is calculated as follows:
32 x (gpio_bank) + gpio_bit
gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31
E.g. GPIO3_A0 becomes 96
ROM-6881
| GPIO Number | GPIO formed | Numeric Representation |
| GPIO0 | Ext-GPIO0 P00 | 493 |
| GPIO1 | Ext-GPIO0 P01 | 494 |
| GPIO2 | Ext-GPIO0 P02 | 495 |
| GPIO3 | Ext-GPIO0 P03 | 496 |
| GPIO4 | Ext-GPIO0 P04 | 497 |
| GPIO5 | GPIO4_B5 | 141 |
| GPIO6 | Ext-GPIO0 P05 | 498 |
| GPIO7 | Ext-GPIO0 P06 | 499 |
| GPIO8 | Ext-GPIO0 P07 | 500 |
| GPIO9 | GPIO4_A0 | 128 |
| GPIO10 | GPIO3_C0 | 112 |
| GPIO11 | GPIO3_C1 | 113 |
Test
Here we take GPIO0 of ROM-6881 as an example.
Export GPIO then you can use control GPIO from userr space through sysfs.
Export GPIO0
# echo 493 > /sys/class/gpio/export
Set GPIO direction to in/out
# echo "out" > /sys/class/gpio/gpio493/direction
Set GPIO value 0/1 if GPIO pin define is output
# echo 1 > /sys/class/gpio/gpio493/value
Unexport GPIO0
# echo 493 > /sys/class/gpio/unexport
Used as IRQ signal
Note:You have to configure GPIO to input
# echo "rising" > /sys/class/gpio/gpio493/edge
- rising: Trigger on rising edge
- falling: Trigger on falling edge
- both: Trigger on both edges
- none: Disable interrupt on both edges
GPIO Test
GPIO0 and GPIO1 are taken as an example: Connect GPIO0 and GPIO1
- Export GPIO0 and GPIO1
# echo 493 > /sys/class/gpio/export # echo 494 > /sys/class/gpio/export
- Set GPIO0 to output and GPIO1 to input
# echo "out" > /sys/class/gpio/gpio493/direction # echo "in" > /sys/class/gpio/gpio494/direction
- Change GPIO0 to 1 and read GPIO1 value
# echo 1 > /sys/class/gpio/gpio493/value # cat /sys/class/gpio/gpio494/value 1
- Change GPIO0 to 0 and read GPIO1 value
# echo 0 > /sys/class/gpio/gpio493/value # cat /sys/class/gpio/gpio494/value 0