Jan/WLED_MM_Infinity
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

I2C: allow any GPIO on 8266 (experimental)

Browse Source 
as it turns out, also on 8266 any pin can be assigned to I2C. Only SPI pins are fixed, and GPIO16 should not be used as it does not support interrupts.
This commit is contained in:
Frank
2023-01-15 22:13:46 +01:00
parent 12cd6a2738
commit a320068bbe
4 changed files with 17 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
wled00/pin_manager.cpp
View File

@@ -518,16 +518,7 @@ bool PinManagerClass::isPinAllocated(byte gpio, PinOwner tag)
//
bool PinManagerClass::joinWire() { // shortcut in case no parameters provided
#ifdef ARDUINO_ARCH_ESP32
// ESP32 - i2c pins can be mapped to any GPIO
return joinWire(i2c_sda, i2c_scl);
#else
// ESP8266: I2C pins are fixed
if ((i2c_sda < 0) || (i2c_scl < 0))
return joinWire(i2c_sda, i2c_scl); // special case: -1 = disable i2c
else
return joinWire(4, 5); // normal case - use HW pins -> SDA = 4, SCL = 5
#endif
}
bool PinManagerClass::joinWire(int8_t pinSDA, int8_t pinSCL) {
@@ -570,19 +561,22 @@ bool PinManagerClass::joinWire(int8_t pinSDA, int8_t pinSCL) {
bool wireIsOK = true;
#ifdef ARDUINO_ARCH_ESP32 // ESP32 - i2c pins can be mapped to any GPIO
wireIsOK = Wire.setPins(pinSDA, pinSCL); // this will fail if Wire is initialised already (i.e. Wire.begin() called prior)
#else // 8266 - I2C pins are fixed
if((pinSDA != 4) || (pinSCL != 5)) { // fixed PINS: SDA = 4, SCL = 5
DEBUG_PRINT(F("PIN Manager: warning ESP8266 I2C pins are fixed. please use SDA="));
DEBUG_PRINTF("%d, SCL=%d !\n",4, 5);
return(false);
}
#else // 8266 - I2C pins are fixed -> actually they are not.
//if((pinSDA != 4) || (pinSCL != 5)) { // fixed PINS: SDA = 4, SCL = 5
// DEBUG_PRINT(F("PIN Manager: warning ESP8266 I2C pins are fixed. please use SDA="));
// DEBUG_PRINTF("%d, SCL=%d !\n",4, 5);
// return(false);
//}
#endif
if (wireIsOK == false) {
USER_PRINTLN(F("PIN Manager: warning - wire.setPins failed!"));
}
//wireIsOK = Wire.begin(); // this will fail if wire is already running
Wire.begin(); // returns void on 8266
#ifdef ARDUINO_ARCH_ESP32
wireIsOK = Wire.begin(pinSDA, pinSCL); // this will fail if wire is already running
#else
Wire.begin(pinSDA, pinSCL); // returns void on 8266
#endif
if (wireIsOK == false) {
USER_PRINTLN(F("PIN Manager: warning - wire.begin failed!"));