reworked usb serial communication (#1766)

firmware/application/usb_serial_device_to_host.h

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "ch.h"
+#include "hal.h"
+
+#define USB_BULK_BUFFER_SIZE 64
+
+#ifndef USBSERIAL_BUFFERS_SIZE
+#define USBSERIAL_BUFFERS_SIZE 128
+#endif
+
+struct SerialUSBDriverVMT {
+    _base_asynchronous_channel_methods
+};
+
+struct SerialUSBDriver {
+    /** @brief Virtual Methods Table.*/
+    const struct SerialUSBDriverVMT* vmt;
+    InputQueue iqueue;                  /* Output queue.*/
+    OutputQueue oqueue;                 /* Input circular buffer.*/
+    uint8_t ib[USBSERIAL_BUFFERS_SIZE]; /* Output circular buffer.*/
+    uint8_t ob[USBSERIAL_BUFFERS_SIZE];
+};
+
+typedef struct SerialUSBDriver SerialUSBDriver;
+
+extern SerialUSBDriver SUSBD1;
+
+void init_serial_usb_driver(SerialUSBDriver* sdp);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+size_t fillOBuffer(OutputQueue* oqp, const uint8_t* bp, size_t n);
+#ifdef __cplusplus
+}
+#endif