int writeIntValueToFile(char* fileName, int value)
{
clearLastError();
char buff[50];
sprintf(buff, "%d", value);
return writeValueToFile(fileName, buff);
}
int
setPinDirection(unsigned int pin, const char *dir) {
char fullPath[250];
sprintf(fullPath, "/sys/class/gpio/gpio%u/direction", pin);
return writeValueToFile(fullPath, dir);
}
int
exportPin(unsigned int pin) {
char fullPath[250];
char fullValue[4];
sprintf(fullPath, "/sys/class/gpio/export");
sprintf(fullValue, "%u", pin);
return writeValueToFile(fullPath, fullValue);
}
int
setPinMode(unsigned int pin, unsigned int mode) {
char fullPath[250];
char fullValue[4];
switch(pin) {
case GPIO1_0:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad0");
break;
case GPIO1_1:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad1");
break;
case GPIO1_2:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad2");
break;
case GPIO1_3:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad3");
break;
case GPIO1_4:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad4");
break;
case GPIO1_5:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad5");
break;
case GPIO1_13:
sprintf(fullPath, "/sys/kernel/debug/omap_mux/gpmc_ad13");
break;
default:
fprintf(stderr, "Pin not recognized! Please inspect the 'angstrom/setPinMode' function.\n");
return -1;
break;
}
sprintf(fullValue, "%u", mode);
return writeValueToFile(fullPath, fullValue);
}
