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Altera_Forum's avatar
Altera_Forum
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17 years ago

Does anyboy use "struct semaphore" and down(struct semaphore

Hello everyone, I use the latest version of nios2-linux(nios2-linux-20090730),when I test the driver nios2-linux/linux-2.6/drivers/char/altera_pio_button.c,I found that the function down(s...
Altera_Forum's avatar
Altera_Forum
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16 years ago

The pio port base should remapped to uncached. Try# define PIO_BUTTON_BASE (na_button_pio | 0x80000000)

I've never used that driver myself. It is just a personal taste. I prefer using gpio and input subsystem which supports polling instead of interrupt driven. Please see the example at linux-2.6/drivers/input/mouse/gpio_mouse.c .

http://www.nioswiki.com/gpio (http://www.nioswiki.com/gpio)

- Hippo