WLED/wled00/pin_manager.cpp
2020-11-15 12:41:51 +01:00

54 lines
1.1 KiB
C++

#include "wled.h"
/*
* Registers pins so there is no attempt for two interfaces to use the same pin
*/
void PinManagerClass::deallocatePin(byte gpio)
{
if (!isPinOk(gpio, false)) return;
byte by = gpio >> 3;
byte bi = gpio - 8*by;
bitWrite(pinAlloc[by], bi, false);
}
bool PinManagerClass::allocatePin(byte gpio, bool output)
{
if (!isPinOk(gpio, output)) return false;
if (isPinAllocated(gpio)) {
DEBUG_PRINT(F("Attempted duplicate allocation of pin "));
DEBUG_PRINTLN(gpio);
return false;
}
byte by = gpio >> 3;
byte bi = gpio - 8*by;
bitWrite(pinAlloc[by], bi, true);
return true;
}
bool PinManagerClass::isPinAllocated(byte gpio)
{
if (!isPinOk(gpio, false)) return true;
byte by = gpio >> 3;
byte bi = gpio - 8*by;
return bitRead(pinAlloc[by], bi);
}
bool PinManagerClass::isPinOk(byte gpio, bool output)
{
if (gpio < 6) return true;
if (gpio < 12) return false; //SPI flash pins
#ifdef ESP8266
if (gpio < 17) return true;
#else //ESP32
if (gpio < 34) return true;
if (gpio < 40 && !output) return true; //34-39 input only
#endif
return false;
}