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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#define GPIO_BASEDIR "/sys/class/gpio"
#define GPIO_EXPORT GPIO_BASEDIR "/export"
#define ENABLE_LEFT_PATH GPIO_BASEDIR "/gpio5/value"
#define ENABLE_RIGHT_PATH GPIO_BASEDIR "/gpio4/value"
#define ENABLE_VALUE "1"
void gpio_write(int port, const char *field, const char *value)
{
char path[256];
sprintf(path, "%s/gpio%d/%s", GPIO_BASEDIR, field);
int fd = open(path, O_WRONLY);
write(fd, value, strlen(value));
close(fd);
}
void enable_displays(void)
{
gpio_write(5, "value", "1");
gpio_write(4, "value", "1");
}
void gpio_init(void)
{
struct {
uint8_t port;
enum { in, out } direction;
uint8_t value;
} ports[] = {
{ 100, in },
{ 91, in },
{ 96, in },
{ 89, in },
{ 95, in },
{ 92, in },
{ 108, out, 0 },
{ 94, out, 0 },
{ 101, out, 0 }, /* 95, 92 */
{ 5, out },
{ 4, out },
{ 93, in },
{ 98, out, 1 },
{ 90, out, 1 }, /* 108, 94, 101 */
{ 88, in },
{ 0, out, 0 },
{ 1, out, 0 },
{ 2, out, 0 },
{ 3, out, 0 },
{ 6, out, 0 },
{ 28, out, 0 },
{ 29, out, 0 },
{ 30, out, 0 },
{ 33, out, 0 },
{ 37, out, 0 },
{ 38, out, 0 },
{ 47, out, 0 },
{ 48, out, 0 },
{ 49, out, 0 },
{ 50, out, 0 },
{ 51, out, 0 },
{ 52, out, 0 },
{ 53, out, 0 },
{ 54, out, 0 },
{ 55, out, 0 },
{ 56, out, 0 },
{ 57, out, 0 },
{ 58, out, 0 },
{ 59, out, 0 },
{ 60, out, 0 },
{ 61, out, 0 },
{ 62, out, 0 },
{ 63, out, 0 },
{ 64, out, 0 },
{ 65, out, 0 },
{ 66, out, 0 },
{ 67, out, 0 },
{ 68, out, 0 },
{ 69, out, 0 },
{ 70, out, 0 },
{ 71, out, 0 },
{ 72, out, 0 },
{ 73, out, 0 },
{ 74, out, 0 },
{ 75, out, 0 }, /* not enabled */
{ 78, out, 0 },
{ 79, out, 0 },
{ 86, out, 0 },
{ 87, out, 0 },
{ 97, out, 0 },
{ 99, out, 0 },
{ 104, out, 0 },
{ 105, out, 0 },
{ 106, out, 0 },
{ 107, out, 0 },
{ 109, out, 0 },
{ 110, out, 0 },
{ 111, out, 0 },
{ 112, out, 0 },
{ 113, out, 0 },
{ 114, out, 0 },
{ 115, out, 0 },
{ 116, out, 0 },
{ 117, out, 0 },
{ 118, out, 0 },
{ 119, out, 0 },
{ 120, out, 0 },
{ 121, out, 0 },
{ 122, out, 0 },
{ 135, out, 0 },
{ 137, out, 0 },
{ 138, out, 0 },
{ 140, out, 0 },
{ 144, out, 0 },
{ 145, out, 0 },
{ 146, out, 0 },
{ 147, out, 0 },
{ 148, out, 0 },
{ 149, out, 0 },
};
int gpio_export = open(GPIO_EXPORT, O_WRONLY);
for (int i = 0; i < sizeof(ports) / sizeof(ports[0]); i++) {
printf("enabling port %d\n", ports[i].port);
dprintf(gpio_export, "%d", ports[i].port);
}
close(gpio_export);
for (int i = 0; i < sizeof(ports) / sizeof(ports[0]); i++) {
gpio_write(ports[i].port, "direction", ports[i].direction == in ? "in" : "out");
}
for (int i = 0; i < sizeof(ports) / sizeof(ports[0]); i++) {
if (ports[i].direction == out) {
gpio_write(ports[i].port, "value", ports[i].value == 1 ? "1" : "0");
}
}
}
int main(int argc, char *argv[])
{
gpio_init();
enable_displays();
return 0;
}
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