Hello,
I will start my GSOC project with a GPIO driver for the RPi BSP, and
part of the GPIO driver code will not be specific to the RPi but to any
board with a GPIO interface. With code reuse in mind and since I did not
found any "generic" API for the GPIO interface in the RTEMS code base, I
intend to propose here an initial *rough* draft of what this API may
look like.
To initialize the API:
rtems_gpio_initialize (struct gpio_config)
which would initialize the API with a specific GPIO peripheral
configuration: number of gpio pins, gpio register addresses, ...
To set a gpio pin as input or output (the direction would be a macro):
rtems_gpio_direction (int gpio, int direction)
To set a gpio pull resistor (either pull up/down or no pull resistor):
rtems_gpio_set_Pull (int gpio, int pull)
Some GPIO I/O:
rtems_gpio_set(int gpio)
rtems_gpio_clr (int gpio)
rtems_gpio_read_value (int gpio)
And interrupt management:
rtems_int_enable (int gpio, rtems_interrupt_level int)
rtems_int_disable (int gpio)
rtems_int_clear (int gpio)
Would appreciate some feedback on this.
--Andre Marques.
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