Hi,

Where can I find a sample gpio driver and related makefile to take a reference ? Thanks,

Regards

Hi. Most simple - to use the interface sysfs

Device Drivers ---> GPIO Support ---> [*] /sys/class/gpio/... (sysfs interface)

Example In userspace:

/bin/echo "60" > /sys/class/gpio/export
/bin/echo "out" > /sys/class/gpio/gpio60/direction
/bin/echo "0" > /sys/class/gpio/gpio60/value
/bin/echo "1" > /sys/class/gpio/gpio60/value

gpio60 == PWM2 - see arch/arm/mach-mx23/mx23_pins.h

#define PINID_PWM2 MXS_PIN_ENCODE(1, 28)
1 x 32 + 28 = 60

Regards

Hi,

Thank you for your reply. Actually, I need a kernel space driver to customize. Actually I am trying to make soft spi on GPIO. Do you have this kind of driver ? Thanks,

Regards,

Цитата

Hi. Most simple - to use the interface sysfs

Device Drivers ---> GPIO Support ---> [*] /sys/class/gpio/... (sysfs interface)

Example In userspace:

/bin/echo "60" > /sys/class/gpio/export
/bin/echo "out" > /sys/class/gpio/gpio60/direction
/bin/echo "0" > /sys/class/gpio/gpio60/value
/bin/echo "1" > /sys/class/gpio/gpio60/value

gpio60 == PWM2 - see arch/arm/mach-mx23/mx23_pins.h

#define PINID_PWM2 MXS_PIN_ENCODE(1, 28)
1 x 32 + 28 = 60

Regards

Цитата

Actually I am trying to make soft spi on GPIO. Do you have this kind of driver ?

I use the built in kernel driver

Device Drivers ---> SPI support ---> <*> GPIO-based bitbanging SPI Master

See my patch - there it is used it for touch panel ads7846(7843)