uart: use machine.Serial as the default output

examples/espat/espconsole/main.go

@@ -30,7 +30,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 )

examples/espat/mqttclient/main.go

@@ -36,7 +36,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 	topic   = "tinygo"

examples/espat/mqttsub/main.go

@@ -37,7 +37,7 @@ var (
 	tx   = machine.PA22
 	rx   = machine.PA23
 
-	console = machine.UART0
+	console = machine.Serial
 
 	adaptor *espat.Device
 	cl      mqtt.Client

examples/flash/console/console_example.go

@@ -20,7 +20,7 @@ var (
 	input [consoleBufLen]byte
 	store [storageBufLen]byte
 
-	console = machine.UART0
+	console = machine.Serial
 
 	dev *flash.Device
 

examples/gps/uart/main.go

@@ -10,7 +10,7 @@ import (
 func main() {
 	println("GPS UART Example")
 	machine.UART1.Configure(machine.UARTConfig{BaudRate: 9600})
-	ublox := gps.NewUART(&machine.UART1)
+	ublox := gps.NewUART(machine.UART1)
 	parser := gps.NewParser()
 	var fix gps.Fix
 	for {

examples/wifinina/connect/main.go

@@ -101,7 +101,7 @@ func printMacAddress() {
 
 // Wait for user to open serial console
 func waitSerial() {
-	for !machine.UART0.DTR() {
+	for !machine.Serial.DTR() {
 		time.Sleep(100 * time.Millisecond)
 	}
 }

examples/wifinina/ntpclient/main.go

@@ -92,7 +92,7 @@ func main() {
 
 // Wait for user to open serial console
 func waitSerial() {
-	for !machine.UART0.DTR() {
+	for !machine.Serial.DTR() {
 		time.Sleep(100 * time.Millisecond)
 	}
 }

examples/wifinina/tlsclient/main.go

@@ -77,7 +77,7 @@ func main() {
 
 // Wait for user to open serial console
 func waitSerial() {
-	for !machine.UART0.DTR() {
+	for !machine.Serial.DTR() {
 		time.Sleep(100 * time.Millisecond)
 	}
 }

examples/wifinina/webclient/main.go

@@ -74,7 +74,7 @@ func main() {
 
 // Wait for user to open serial console
 func waitSerial() {
-	for !machine.UART0.DTR() {
+	for !machine.Serial.DTR() {
 		time.Sleep(100 * time.Millisecond)
 	}
 }