Wire: fix mux on SCI9

Channel indexes are 0 based, so channel number is bigger than max channel index

Author: facchinm

libraries/Wire/Wire.cpp

@@ -230,7 +230,7 @@ bool TwoWire::cfg_pins(int max_index) {
   ioport_peripheral_t ioport_scl;
 
   if(IS_SCI(cfg_sda)) {
-    if(channel >= TWOWIRE_MAX_SCI_CHANNELS) {
+    if(channel >= TWOWIRE_MAX_SCI_CHANNELS) { // channels are 0 index based
       return false;
     }
     is_sci = true;
@@ -242,7 +242,7 @@ bool TwoWire::cfg_pins(int max_index) {
 
   }
   else {
-    if(channel >= TWOWIRE_MAX_I2C_CHANNELS) {
+    if(channel >= TWOWIRE_MAX_I2C_CHANNELS) { // channels are 0 index based
       return false;
     }
     is_sci = false;

libraries/Wire/Wire.h

@@ -58,8 +58,8 @@ using I2C_onTxCallback_f        = void (*)(void);
 
 #define I2C_BUFFER_LENGTH      256
 
-#define TWOWIRE_MAX_I2C_CHANNELS 2
-#define TWOWIRE_MAX_SCI_CHANNELS 9
+#define TWOWIRE_MAX_I2C_CHANNELS (3)  // IIC0 to IIC2
+#define TWOWIRE_MAX_SCI_CHANNELS (10) // SCI0 to SCI9
 
 #ifdef __cplusplus