From f4bee40834e0858c5c78a5ccf6dc6a4a788a40dd Mon Sep 17 00:00:00 2001
From: Nico <nico-2006@web.de>
Date: Sat, 29 Nov 2014 20:27:32 +0100
Subject: [PATCH] Added USB-Serial function

Its now possible to also reprogram the main MCU with the HoodLoader2 in
the sketch itself. It might have some bugs/errors since the USB
implementation isn't that reliable.
---
 .../HoodLoader2_USB-Serial.ino                | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 examples/HoodLoader2/HoodLoader2_USB-Serial/HoodLoader2_USB-Serial.ino

diff --git a/examples/HoodLoader2/HoodLoader2_USB-Serial/HoodLoader2_USB-Serial.ino b/examples/HoodLoader2/HoodLoader2_USB-Serial/HoodLoader2_USB-Serial.ino
new file mode 100644
index 0000000..1dce7ff
--- /dev/null
+++ b/examples/HoodLoader2/HoodLoader2_USB-Serial/HoodLoader2_USB-Serial.ino
@@ -0,0 +1,51 @@
+/*
+ Copyright (c) 2014 NicoHood
+ See the readme for credit to other people.
+
+ HoodLoader2 USB-Serial
+
+ Transferes from USB to HW Serial and vice versa.
+ It also resets the main MCU on a DTR rise.
+ */
+
+void setup() {
+  // set main MCU by default active
+  pinMode(MAIN_MCU_RESET_PIN, OUTPUT);
+  digitalWrite(MAIN_MCU_RESET_PIN, HIGH);
+
+  // Start USB and HW Serial
+  Serial.begin(115200);
+  Serial1.begin(115200);
+}
+
+void loop() {
+  // USB -> Serial
+  for (int i = 0; i < USB_EP_SIZE; i++) {
+    // read maximum one EP_SIZE to not block
+    if (Serial.available())
+      Serial1.write(Serial.read());
+    else break;
+  }
+
+  // Serial -> USB
+  if (Serial1.available()) {
+    Serial.flush();
+    // send maximum one EP_SIZE to give the usb some time to flush the buffer
+    uint8_t buff[USB_EP_SIZE-1];
+    int i = 0;
+    for (i = 0; i < USB_EP_SIZE-1; i++) {
+      if (Serial1.available())
+        buff[i] = Serial1.read();
+      else break;
+    }
+    Serial.write(buff, i);
+  }
+
+  // reset the main mcu if DTR goes HIGH
+  static bool lastDTR = 0;
+  bool newDTR = (Serial.lineState()&CDC_CONTROL_LINE_OUT_DTR) ? 1 : 0;
+  if (lastDTR ^ newDTR)
+    digitalWrite(MAIN_MCU_RESET_PIN, lastDTR);
+  lastDTR = newDTR;
+}
+