Automatic script upload working, no buttons or fiddling

Add smarts to the UF2 uploader to potentially trigger a reboot if the
device passed in is /dev/tty* or COM*.  Will cause reboot to USB
bootloader and standard UF2 upload will happen w/o any user
intervention.

cores/rp2040/SerialUSB.cpp

@@ -122,6 +122,10 @@ static int64_t timer_task(__unused alarm_id_t id, __unused void *user_data) {
 void SerialUSB::begin(int baud) {
     (void) baud; //ignored
 
+    if (_running) {
+        return;
+    }
+
     tusb_init();
 
     irq_set_exclusive_handler(PICO_STDIO_USB_LOW_PRIORITY_IRQ, low_priority_worker_irq);
@@ -129,6 +133,8 @@ void SerialUSB::begin(int baud) {
 
     mutex_init(&usb_mutex);
     add_alarm_in_us(PICO_STDIO_USB_TASK_INTERVAL_US, timer_task, NULL, true);
+
+    _running = true;
 }
 
 void SerialUSB::end() {

cores/rp2040/SerialUSB.h

@@ -19,6 +19,8 @@ public:
     virtual size_t write(const uint8_t *p, size_t len) override;
     using Print::write;
     operator bool();
+private:
+    bool _running = false;
 };
 
 extern SerialUSB Serial;

cores/rp2040/main.cpp

@@ -1,9 +1,12 @@
+#include <Arduino.h>
+
 extern void setup();
 extern void loop();
 
 extern "C" {
 
 int main() {
+	Serial.begin();
 	setup();
 	while (1) loop();
 	return 0;

platform.txt

@@ -135,6 +135,6 @@ tools.uf2conv.upload.params.quiet=
 # First, potentially perform an erase or nothing
 # Next, do the binary upload
 # Combined in one rule because Arduino doesn't suport upload.1.pattern/upload.3.pattern
-tools.uf2conv.upload.pattern="{cmd}" "{runtime.platform.path}/system/uf2conv.py" --family RP2040 --deploy "{build.path}/{build.project_name}.uf2"
+tools.uf2conv.upload.pattern="{cmd}" "{runtime.platform.path}/system/uf2conv.py" --serial "{serial.port}" --family RP2040 --deploy "{build.path}/{build.project_name}.uf2"
 tools.uf2conv.upload.network_pattern="{cmd}" "{runtime.platform.path}/system/uf2conv.py" --family RP2040 --deploy "{build.path}/{build.project_name}.uf2"
 

system/uf2conv.py

@@ -32,7 +32,8 @@ import re
 import os
 import os.path
 import argparse
-
+import serial
+import time
 
 UF2_MAGIC_START0 = 0x0A324655 # "UF2\n"
 UF2_MAGIC_START1 = 0x9E5D5157 # Randomly selected
@@ -290,6 +291,7 @@ def main():
                         help='specify familyID - number or name (default: 0x0)')
     parser.add_argument('-C' , '--carray', action='store_true',
                         help='convert binary file to a C array, not UF2')
+    parser.add_argument('-s', '--serial', dest='serial', help='Serial port to reset before upload')
     args = parser.parse_args()
     appstartaddr = int(args.base, 0)
 
@@ -301,6 +303,17 @@ def main():
         except ValueError:
             error("Family ID needs to be a number or one of: " + ", ".join(families.keys()))
 
+    if args.serial:
+        if str(args.serial).startswith("/dev/tty") or str(args.serial).startswith("COM"):
+            try:
+                ser = serial.Serial(args.serial, 1200)
+                ser.dtr = False
+                print("Resetting "+str(args.serial))
+                # Probably should be smart and check for device appearance or something
+                time.sleep(10)
+            except:
+                pass
+
     if args.list:
         list_drives()
     else: