added bridge example

Author: gbr1

Diff for: examples/bridge_firmware_updater/bridge_firmware_updater

@@ -0,0 +1,85 @@
+/*
+    This file is part of the Arduino_Alvik library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+    
+*/
+
+
+/*
+  You can use this sketch to make your Arduino Nano ESP32 an USB-to-serial adapter.
+  This allows to flash firmware into the Arduino Alvik Carrier via Arduino Nano ESP32.
+
+  Please refer to Arduino_AlvikCarrier library available at https://github.com/arduino-libraries/Arduino_AlvikCarrier
+*/
+
+
+
+
+#include "Arduino_Alvik.h"
+
+unsigned long baud = 115200;
+
+int rts = -1;
+int dtr = -1;
+
+
+static void onLineChange(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
+  if (event_base == ARDUINO_USB_CDC_EVENTS) {
+    arduino_usb_cdc_event_data_t * data = (arduino_usb_cdc_event_data_t*)event_data;
+    switch (event_id) {
+      case ARDUINO_USB_CDC_LINE_CODING_EVENT:
+        auto baud = data->line_coding.bit_rate;
+        Serial0.updateBaudRate(baud);
+        while (Serial0.available()) {
+          Serial0.read();
+        }
+        break;
+    }
+  }
+}
+
+void setup() {
+  Serial.onEvent(onLineChange);
+  Serial.enableReboot(false);
+  Serial.begin(baud);
+  Serial.setRxBufferSize(0);
+  Serial.setRxBufferSize(2048);
+  Serial0.setRxBufferSize(8192);
+  Serial0.setTxBufferSize(8192);
+  Serial0.begin(baud, SERIAL_8E1);
+  Serial0.flush();
+  pinMode(BOOT_STM32, OUTPUT);
+  pinMode(RESET_STM32, OUTPUT);
+  digitalWrite(BOOT_STM32,HIGH);
+  delay(1000);
+  digitalWrite(RESET_STM32,LOW);
+  delay(1000);
+  digitalWrite(RESET_STM32,HIGH);
+
+
+
+}
+
+void loop() {
+  int len = 0;
+  uint8_t auc_buffer[488];
+  while (Serial.available() && len < sizeof(auc_buffer)) {
+    auc_buffer[len++] = Serial.read();
+  }
+  if (len) {
+    Serial0.write(auc_buffer, len);
+  }
+
+  len = 0;
+  while (Serial0.available() && len < sizeof(auc_buffer)) {
+    auc_buffer[len++] = Serial0.read();
+  }
+  if (len) {
+    Serial.write(auc_buffer, len);
+  }
+}