rtl8720dn: refactor by bringing this driver more in line with wifinina and espat

Signed-off-by: deadprogram <ron@hybridgroup.com>

rtl8720dn/adapter.go

@@ -1,25 +1,57 @@
 package rtl8720dn
 
 import (
+	"machine"
 	"time"
 
 	"tinygo.org/x/drivers/net"
 )
 
-func (r *RTL8720DN) ConnectToAccessPoint(ssid, pass string, timeout time.Duration) error {
+type Driver struct {
+	*RTL8720DN
+}
+
+// New returns a new RTL8720DN driver. The UART that is passed in
+// will be reconfigured at the baud rate required by the device.
+func New(uart *machine.UART, tx, rx, en machine.Pin) *Driver {
+	enable(en)
+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx, BaudRate: 614400})
+
+	return &Driver{
+		RTL8720DN: &RTL8720DN{
+			port:  &UARTx{UART: uart},
+			seq:   1,
+			sema:  make(chan bool, 1),
+			debug: false,
+		},
+	}
+}
+
+func (d *Driver) Configure() error {
+	net.UseDriver(d)
+
+	_, err := d.Rpc_tcpip_adapter_init()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (d *Driver) ConnectToAccessPoint(ssid, pass string, timeout time.Duration) error {
 	if len(ssid) == 0 {
 		return net.ErrWiFiMissingSSID
 	}
 
-	return r.ConnectToAP(ssid, pass)
+	return d.ConnectToAP(ssid, pass)
 }
 
-func (r *RTL8720DN) Disconnect() error {
-	_, err := r.Rpc_wifi_disconnect()
+func (d *Driver) Disconnect() error {
+	_, err := d.Rpc_wifi_disconnect()
 	return err
 }
 
-func (r *RTL8720DN) GetClientIP() (string, error) {
-	ip, _, _, err := r.GetIP()
+func (d *Driver) GetClientIP() (string, error) {
+	ip, _, _, err := d.GetIP()
 	return ip.String(), err
 }