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Add initial GPIO API implementation.

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This currently includes a number of basic functions. Example usage:

 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
               GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
 gpio_set(GPIOB, GPIO4);
 gpio_clear(GPIOG, GPIO2 | GPIO9);
 gpio_toggle(GPIOA, GPIO7);
 reg16 = gpio_port_read(GPIOD);
 gpio_port_write(GPIOF, 0xc8fe);
This commit is contained in:
Uwe Hermann 2009-07-18 16:20:32 +02:00
parent d43224acfb
commit 3262983d27
2 changed files with 64 additions and 9 deletions
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10
include/libopenstm32/gpio.h
View File

@ -136,9 +136,13 @@
#define GPIO13 (1 << 13)
#define GPIO14 (1 << 14)
#define GPIO15 (1 << 15)
#define GPIO_ALL 0xffff
void gpio_set(unsigned int gpio);
void gpio_clear(unsigned int gpio);
void gpio_toggle(unsigned int gpio);
void gpio_set_mode(u32 gpioport, u8 mode, u8 cnf, u16 gpios);
void gpio_set(u32 gpioport, u16 gpios);
void gpio_clear(u32 gpioport, u16 gpios);
void gpio_toggle(u32 gpioport, u16 gpios);
u16 gpio_port_read(u32 gpioport);
void gpio_port_write(u32 gpioport, u16 data);
#endif

65
lib/gpio.c
View File

@ -18,19 +18,70 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Basic GPIO handling API.
*
* Examples:
* gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
* GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
* gpio_set(GPIOB, GPIO4);
* gpio_clear(GPIOG, GPIO2 | GPIO9);
* gpio_toggle(GPIOA, GPIO7);
* reg16 = gpio_port_read(GPIOD);
* gpio_port_write(GPIOF, 0xc8fe);
*
* TODO:
* - GPIO remapping support
*/
#include "libopenstm32.h"
void gpio_set(unsigned int gpio)
void gpio_set_mode(u32 gpioport, u8 mode, u8 cnf, u16 gpios)
{
/* TODO */
u16 i, movingbit = 1, offset = 0;
u32 crl = 0, crh = 0;
for (i = 0; i < 16; i++) {
if ((movingbit & gpios) != movingbit) {
movingbit <<= 1;
continue;
}
offset = (i < 8) ? (i * 4) : ((i - 8) * 4);
if (i < 8)
crl |= (mode << offset) | (cnf << (offset + 2));
else
crh |= (mode << offset) | (cnf << (offset + 2));
}
void gpio_clear(unsigned int gpio)
{
/* TODO */
GPIO_CRL(gpioport) = crl;
GPIO_CRH(gpioport) = crh;
}
void gpio_toggle(unsigned int gpio)
void gpio_set(u32 gpioport, u16 gpios)
{
/* TODO */
GPIO_BSRR(gpioport) = gpios;
}
void gpio_clear(u32 gpioport, u16 gpios)
{
GPIO_BRR(gpioport) = gpios;
}
/* TODO: Should work for multiple GPIOs? */
void gpio_toggle(u32 gpioport, u16 gpio)
{
if ((gpio_port_read(gpioport) & gpio) == gpio)
gpio_clear(gpioport, gpio);
else
gpio_set(gpioport, gpio);
}
u16 gpio_port_read(u32 gpioport)
{
return (u16)GPIO_IDR(gpioport);
}
void gpio_port_write(u32 gpioport, u16 data)
{
GPIO_ODR(gpioport) = data;
}