FskErr FskGPIOPlatformSetDirection(FskGPIO gpio, GPIOdirection direction){
if (gpio->realPin >= FRONTOFFSET){
int pin = gpio->realPin - FRONTOFFSET;
int slaveAddy = 0;
if (pin < 8){
slaveAddy = 0x20;
}else{
slaveAddy = 0x21;
pin -= 8;
}
if (direction == in){
FskHardwarePinsDoMux(pin, slaveAddy, 4);
}else if(direction == out){
FskHardwarePinsDoMux(pin, slaveAddy, 5);
}
gpio->direction = direction;
return kFskErrNone;
}else{
FskErr err = kFskErrNone;
FILE *f = NULL;
char buffer[40];
char existingDirection;
if (undefined != direction) {
snprintf(buffer, 40, "/sys/class/gpio/gpio%d/direction", gpio->realPin);
f = fopen(buffer, "w+");
bailIfNoFile(f);
rewind(f);
fscanf(f, "%c", &existingDirection);
rewind(f);
if (direction == in && existingDirection != 'i'){
fprintf(f, "in");
}else if (direction == out && existingDirection != 'o'){
fprintf(f, "out");
}
fclose(f);
f = NULL;
}
if ( ((FskGPIOSysfs)gpio->platform)->valueFile != NULL) fclose(((FskGPIOSysfs)gpio->platform)->valueFile);
snprintf(buffer, 40, "/sys/class/gpio/gpio%d/value", gpio->realPin);
if (direction == in){
f = fopen(buffer, "r+");
}else if (direction == out){
f = fopen(buffer, "w+");
}
bailIfNoFile(f);
setbuf(f, NULL);
((FskGPIOSysfs)gpio->platform)->valueFile = f;
bail:
if (err){
gpio->direction = errorDir;
return err;
}else{
gpio->direction = direction;
return err;
}
}
}
FskErr createFrontAnalogNew(FskPinAnalog *pin, SInt32 number, const char *name)
{
FskErr err;
createFrontAnalog cfa = NULL;
err = FskMemPtrNewClear(sizeof(createFrontAnalogRecord), &cfa);
if (err) return err;
err = FskPinI2CNew(&cfa->i2c, 0, 0, I2CBUS);
if (err) {
FskMemPtrDispose(cfa);
return err;
}
cfa->pin = number - 51;
cfa->address = (cfa->pin < 8) ? a2dAddr1 : a2dAddr2;
cfa->pin = 7 - (cfa->pin & 7);
//@@ this is odd.... this makes it an analog pin. seems like we should be checking that it is an analog pin, rather than forcing it
FskHardwarePinsDoMux(cfa->pin, cfa->address, 3);
*pin = (FskPinAnalog)cfa;
return err;
}
