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| author | Tom Rix <Tom.Rix@windriver.com> | 2009-05-15 23:48:36 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2009-06-12 20:39:50 +0200 |
| commit | 0c872ecd01d6782ae9d37b6eb721404a4a48f356 (patch) | |
| tree | 522a36bcdfc4b52423c410de64e853384a84eb7a /doc | |
| parent | 376aee78dd66ae0dc4ce496cbe93ecc80aaad48e (diff) | |
OMAP3 Port kernel omap gpio interface.
Port version 2.6.27 of the linux kernel's omap gpio interface to u-boot.
The orignal source is in linux/arch/arm/plat-omap/gpio.c
See doc/README.omap3 for instructions on use.
Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.omap3 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/doc/README.omap3 b/doc/README.omap3 index 9ab09793e..e05e816df 100644 --- a/doc/README.omap3 +++ b/doc/README.omap3 @@ -84,6 +84,38 @@ For all other commands see help +Interfaces +========== + +gpio + +To set a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(N, 0); + omap_set_gpio_dataout(N, 1); + } + +To clear a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(N, 0); + omap_set_gpio_dataout(N, 0); + } + +To read a bit : + + if (!omap_request_gpio(N)) { + omap_set_gpio_direction(NULL, 1); + val = omap_get_gpio_datain(N); + omap_free_gpio(N); + } + if (val) + printf("GPIO N is set\n"); + else + printf("GPIO N is clear\n"); + + Acknowledgements ================ |