Allow re-setting identical pins without panic() (#1655)

Setting a pin to the current value is a no-op, not fatal.

Fixes #1652

cores/rp2040/SerialUART.cpp

@@ -40,6 +40,10 @@ bool SerialUART::setRX(pin_size_t pin) {
         return true;
     }
 
+    if (_rx == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Serial%d.RX while running", uart_get_index(_uart) + 1);
     } else {
@@ -57,6 +61,10 @@ bool SerialUART::setTX(pin_size_t pin) {
         return true;
     }
 
+    if (_tx == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Serial%d.TX while running", uart_get_index(_uart) + 1);
     } else {
@@ -74,6 +82,10 @@ bool SerialUART::setRTS(pin_size_t pin) {
         return true;
     }
 
+    if (_rts == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Serial%d.RTS while running", uart_get_index(_uart) + 1);
     } else {
@@ -91,6 +103,10 @@ bool SerialUART::setCTS(pin_size_t pin) {
         return true;
     }
 
+    if (_cts == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Serial%d.CTS while running", uart_get_index(_uart) + 1);
     } else {

libraries/SPI/src/SPI.cpp

@@ -206,6 +206,10 @@ bool SPIClassRP2040::setRX(pin_size_t pin) {
         return true;
     }
 
+    if (_RX == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set SPI%s.RX while running", spi_get_index(_spi) ? "1" : "");
     } else {
@@ -223,6 +227,10 @@ bool SPIClassRP2040::setCS(pin_size_t pin) {
         return true;
     }
 
+    if (_CS == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set SPI%s.CS while running", spi_get_index(_spi) ? "1" : "");
     } else {
@@ -240,6 +248,10 @@ bool SPIClassRP2040::setSCK(pin_size_t pin) {
         return true;
     }
 
+    if (_SCK == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set SPI%s.SCK while running", spi_get_index(_spi) ? "1" : "");
     } else {
@@ -257,6 +269,10 @@ bool SPIClassRP2040::setTX(pin_size_t pin) {
         return true;
     }
 
+    if (_TX == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set SPI%s.TX while running", spi_get_index(_spi) ? "1" : "");
     } else {

libraries/Wire/src/Wire.cpp

@@ -56,6 +56,10 @@ bool TwoWire::setSDA(pin_size_t pin) {
         return true;
     }
 
+    if (_sda == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Wire%s.SDA while running", i2c_hw_index(_i2c) ? "1" : "");
     } else {
@@ -73,6 +77,10 @@ bool TwoWire::setSCL(pin_size_t pin) {
         return true;
     }
 
+    if (_scl == pin) {
+        return true;
+    }
+
     if (_running) {
         panic("FATAL: Attempting to set Wire%s.SCL while running", i2c_hw_index(_i2c) ? "1" : "");
     } else {