add CDC-ECM/RNDIS/CDC-EEM network device class with example

src/class/net/net_device.h

@@ -0,0 +1,84 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Peter Lawrence
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef _TUSB_NET_DEVICE_H_
+#define _TUSB_NET_DEVICE_H_
+
+#include "common/tusb_common.h"
+#include "device/usbd.h"
+#include "class/cdc/cdc.h"
+#include "lwip/pbuf.h"
+#include "netif/ethernet.h"
+
+/* declared here, NOT in usb_descriptors.c, so that the driver can intelligently ZLP as needed */
+#define CFG_TUD_NET_ENDPOINT_SIZE ((CFG_TUSB_RHPORT0_MODE & OPT_MODE_HIGH_SPEED) ? 512 : 64)
+
+/* Maximum Tranmission Unit (in bytes) of the network, including Ethernet header */
+#define CFG_TUD_NET_MTU           (1500 + SIZEOF_ETH_HDR)
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Application API
+//--------------------------------------------------------------------+
+
+// client must provide this: initialize any network state back to the beginning
+void network_init_callback(void);
+
+// client must provide this: return false if the packet buffer was not accepted
+bool network_recv_callback(struct pbuf *p);
+
+// client must provide this: 48-bit MAC address
+extern const uint8_t network_mac_address[6];
+
+// indicate to network driver that client has finished with the packet provided to network_recv_callback()
+void network_recv_renew(void);
+
+// poll network driver for its ability to accept another packet to transmit
+bool network_can_xmit(void);
+
+// if network_can_xmit() returns true, network_xmit() can be called once
+void network_xmit(struct pbuf *p);
+
+//--------------------------------------------------------------------+
+// INTERNAL USBD-CLASS DRIVER API
+//--------------------------------------------------------------------+
+void netd_init             (void);
+void netd_reset            (uint8_t rhport);
+bool netd_open             (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t *p_length);
+bool netd_control_request  (uint8_t rhport, tusb_control_request_t const * request);
+bool netd_control_complete (uint8_t rhport, tusb_control_request_t const * request);
+bool netd_xfer_cb          (uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
+void netd_report           (uint8_t *buf, uint16_t len);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_NET_DEVICE_H_ */