m5stamp-c3: add pin setting of UART

sago35 · deadprogram · commit 1deee3ec5a19 · 2022-04-07T07:16:27.000+02:00
diff --git a/src/machine/board_m5stamp_c3.go b/src/machine/board_m5stamp_c3.go
@@ -42,6 +42,9 @@ const (
 	SPIQ       = IO17
 	U0RXD      = IO20
 	U0TXD      = IO21
+
+	UART_TX_PIN = U0TXD
+	UART_RX_PIN = U0RXD
 )
 
 const (
