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sam3x: Add gpio_init convenience function.

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This commit is contained in:
Gareth McMullin 2013-05-01 13:17:21 -07:00 committed by Piotr Esden-Tempski
parent f311966f09
commit 614e26a3b1
2 changed files with 47 additions and 0 deletions
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13
include/libopencm3/sam3x/gpio.h
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@ -22,6 +22,19 @@
#include <libopencm3/sam3x/pio.h> #include <libopencm3/sam3x/pio.h>
/* flags may be or'd together, but only contain one of
* GPOUTPUT, PERIPHA and PERIPHB */
enum gpio_flags {
GPIO_FLAG_GPINPUT = 0,
GPIO_FLAG_GPOUTPUT = 1,
GPIO_FLAG_PERIPHA = 2,
GPIO_FLAG_PERIPHB = 3,
GPIO_FLAG_OPEN_DRAIN = 4,
GPIO_FLAG_PULL_UP = 8,
};
void gpio_init(u32 gpioport, u32 pins, enum gpio_flags flags);
static inline void gpio_set(u32 gpioport, u32 gpios) static inline void gpio_set(u32 gpioport, u32 gpios)
{ {
PIO_SODR(gpioport) = gpios; PIO_SODR(gpioport) = gpios;

34
lib/sam3x/gpio.c
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@ -19,6 +19,40 @@
#include <libopencm3/sam3x/gpio.h> #include <libopencm3/sam3x/gpio.h>
void gpio_init(u32 port, u32 pins, enum gpio_flags flags)
{
switch (flags & 3) {
case GPIO_FLAG_GPINPUT:
/* input mode doesn't really exist, so we make a high
* output in open-drain mode
*/
PIO_SODR(port) = pins;
flags |= GPIO_FLAG_OPEN_DRAIN;
/* fall through */
case GPIO_FLAG_GPOUTPUT:
PIO_OER(port) = pins;
PIO_PER(port) = pins;
break;
case GPIO_FLAG_PERIPHA:
PIO_ABSR(port) &= ~pins;
PIO_PDR(port) = pins;
break;
case GPIO_FLAG_PERIPHB:
PIO_ABSR(port) |= pins;
PIO_PDR(port) = pins;
}
if (flags & GPIO_FLAG_OPEN_DRAIN)
PIO_MDER(port) = pins;
else
PIO_MDDR(port) = pins;
if (flags & GPIO_FLAG_PULL_UP)
PIO_PUER(port) = pins;
else
PIO_PUDR(port) = pins;
}
void gpio_toggle(u32 gpioport, u32 gpios) void gpio_toggle(u32 gpioport, u32 gpios)
{ {
u32 odsr = PIO_ODSR(gpioport); u32 odsr = PIO_ODSR(gpioport);