add Serial1 on STEMMA connector

Author: ladyada

variants/trellis_m4/variant.cpp

@@ -63,10 +63,10 @@ const PinDescription g_APinDescription[]=
   { PORTA, 24, PIO_COM, PIN_ATTR_NONE, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_8 }, // USB/DM
   { PORTA, 25, PIO_COM, PIN_ATTR_NONE, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_9 }, // USB/DP
 
-  // 21..22 I2C pins (SDA/SCL)
+  // 21..22 I2C pins (SDA/SCL) or Serial1 Pins
   // ----------------------
-  { PORTB,  8, PIO_SERCOM_ALT, (PIN_ATTR_ANALOG|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), ADC_Channel2, PWM0_CH6, TCC0_CH6, EXTERNAL_INT_12 }, // SERCOM 2.0
-  { PORTB,  9, PIO_SERCOM_ALT, (PIN_ATTR_ANALOG_ALT|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), ADC_Channel1, PWM0_CH7, TCC0_CH7, EXTERNAL_INT_13 }, // SERCOM 2.1
+  { PORTB,  8, PIO_SERCOM_ALT, (PIN_ATTR_ANALOG|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), ADC_Channel2, PWM0_CH6, TCC0_CH6, EXTERNAL_INT_12 }, // SERCOM 4.0
+  { PORTB,  9, PIO_SERCOM_ALT, (PIN_ATTR_ANALOG_ALT|PIN_ATTR_PWM|PIN_ATTR_TIMER_ALT), ADC_Channel1, PWM0_CH7, TCC0_CH7, EXTERNAL_INT_13 }, // SERCOM 4.1
 
   // ----------------------
   // 23 - 28 QSPI (SCK, CS, IO0, IO1, IO2, IO3)
@@ -108,3 +108,22 @@ SERCOM sercom2( SERCOM2 ) ;
 SERCOM sercom3( SERCOM3 ) ;
 SERCOM sercom4( SERCOM4 ) ;
 SERCOM sercom5( SERCOM5 ) ;
+
+Uart Serial1( &sercom4, PIN_SERIAL1_RX, PIN_SERIAL1_TX, PAD_SERIAL1_RX, PAD_SERIAL1_TX ) ;
+
+void SERCOM4_0_Handler()
+{
+  Serial1.IrqHandler();
+}
+void SERCOM4_1_Handler()
+{
+  Serial1.IrqHandler();
+}
+void SERCOM4_2_Handler()
+{
+  Serial1.IrqHandler();
+}
+void SERCOM4_3_Handler()
+{
+  Serial1.IrqHandler();
+}

variants/trellis_m4/variant.h

@@ -124,8 +124,8 @@ static const uint8_t LINE_RIGHT = PIN_LINE_RIGHT;
  */
 
 // Serial1
-#define PIN_SERIAL1_RX       (0ul)
-#define PIN_SERIAL1_TX       (1ul)
+#define PIN_SERIAL1_RX       (22ul)
+#define PIN_SERIAL1_TX       (21ul)
 #define PAD_SERIAL1_RX       (SERCOM_RX_PAD_1)
 #define PAD_SERIAL1_TX       (UART_TX_PAD_0)
 
@@ -214,6 +214,8 @@ extern SERCOM sercom3;
 extern SERCOM sercom4;
 extern SERCOM sercom5;
 
+extern Uart Serial1;
+
 #endif
 
 // These serial port names are intended to allow libraries and architecture-neutral
@@ -233,6 +235,9 @@ extern SERCOM sercom5;
 //                            pins are NOT connected to anything by default.
 #define SERIAL_PORT_USBVIRTUAL      Serial
 #define SERIAL_PORT_MONITOR         Serial
+#define SERIAL_PORT_HARDWARE        Serial1
+#define SERIAL_PORT_HARDWARE_OPEN   Serial1
+
 
 #endif /* _VARIANT_MERTO_M4_ */