usb: add support for feather_rp2040 and pico

Author: sago35

src/machine/board_feather_rp2040.go

@@ -60,3 +60,14 @@ const (
 	// Default Serial In Bus 1 for SPI communications
 	SPI1_SDI_PIN = GPIO12 // Rx
 )
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Adafruit Feather RP2040"
+	usb_STRING_MANUFACTURER = "Adafruit"
+)
+
+var (
+	usb_VID uint16 = 0x239A
+	usb_PID uint16 = 0x80F1
+)

src/machine/board_pico.go

@@ -64,3 +64,14 @@ const (
 	// Default Serial In Bus 1 for SPI communications
 	SPI1_SDI_PIN = GPIO12 // Rx
 )
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Raspberry Pi Pico"
+	usb_STRING_MANUFACTURER = "Raspberry Pi"
+)
+
+var (
+	usb_VID uint16 = 0x2E8A
+	usb_PID uint16 = 0x0003
+)

src/machine/usb.go

@@ -1,5 +1,5 @@
-//go:build sam || nrf52840
-// +build sam nrf52840
+//go:build sam || nrf52840 || rp2040
+// +build sam nrf52840 rp2040
 
 package machine
 

src/machine/usb_descriptor.go

@@ -1,5 +1,5 @@
-//go:build sam || nrf52840
-// +build sam nrf52840
+//go:build sam || nrf52840 || rp2040
+// +build sam nrf52840 rp2040
 
 package machine
 

src/runtime/runtime_rp2040.go

@@ -5,8 +5,8 @@ package runtime
 
 import (
 	"device/arm"
-
 	"machine"
+	"machine/usb/cdc"
 )
 
 // machineTicks is provided by package machine.
@@ -76,6 +76,8 @@ func machineInit()
 func init() {
 	machineInit()
 
+	cdc.EnableUSBCDC()
+	machine.USB.Configure(machine.UARTConfig{})
 	machine.Serial.Configure(machine.UARTConfig{})
 }
 

targets/feather-rp2040.json

@@ -2,7 +2,8 @@
     "inherits": [
         "rp2040"
     ],
-    "serial": "uart",
+    "serial": "usb",
+    "serial-port": ["acm:239a:80f1"],
     "build-tags": ["feather_rp2040"],
     "linkerscript": "targets/feather-rp2040.ld",
     "extra-files": [

targets/pico.json

@@ -3,7 +3,8 @@
         "rp2040"
     ],
     "build-tags": ["pico"],
-    "serial": "uart",
+    "serial": "usb",
+    "serial-port": ["acm:2e8a:0003"],
     "linkerscript": "targets/pico.ld",
     "extra-files": [
         "targets/pico-boot-stage2.S"