/* * This file is part of the libopencm3 project. * * Copyright (C) 2010 Gareth McMullin * * This library is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This library 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, see . */ #include #include #include #include #include "cdcacm.h" static const struct usb_device_descriptor dev = { .bLength = USB_DT_DEVICE_SIZE, .bDescriptorType = USB_DT_DEVICE, .bcdUSB = 0x0200, .bDeviceClass = USB_CLASS_CDC, .bDeviceSubClass = 0, .bDeviceProtocol = 0, .bMaxPacketSize0 = 64, .idVendor = 0x0483, .idProduct = 0x5740, .bcdDevice = 0x0200, .iManufacturer = 1, .iProduct = 2, .iSerialNumber = 3, .bNumConfigurations = 1, }; /* * This notification endpoint isn't implemented. According to CDC spec its * optional, but its absence causes a NULL pointer dereference in Linux * cdc_acm driver. */ static const struct usb_endpoint_descriptor comm_endp[] = {{ .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = 0x83, .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT, .wMaxPacketSize = 16, .bInterval = 255, }}; static const struct usb_endpoint_descriptor data_endp[] = {{ .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = 0x01, .bmAttributes = USB_ENDPOINT_ATTR_BULK, .wMaxPacketSize = 64, .bInterval = 1, }, { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = 0x82, .bmAttributes = USB_ENDPOINT_ATTR_BULK, .wMaxPacketSize = 64, .bInterval = 1, }}; static const struct { struct usb_cdc_header_descriptor header; struct usb_cdc_call_management_descriptor call_mgmt; struct usb_cdc_acm_descriptor acm; struct usb_cdc_union_descriptor cdc_union; } __attribute__((packed)) cdcacm_functional_descriptors = { .header = { .bFunctionLength = sizeof(struct usb_cdc_header_descriptor), .bDescriptorType = CS_INTERFACE, .bDescriptorSubtype = USB_CDC_TYPE_HEADER, .bcdCDC = 0x0110, }, .call_mgmt = { .bFunctionLength = sizeof(struct usb_cdc_call_management_descriptor), .bDescriptorType = CS_INTERFACE, .bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT, .bmCapabilities = 0, .bDataInterface = 1, }, .acm = { .bFunctionLength = sizeof(struct usb_cdc_acm_descriptor), .bDescriptorType = CS_INTERFACE, .bDescriptorSubtype = USB_CDC_TYPE_ACM, .bmCapabilities = 0, }, .cdc_union = { .bFunctionLength = sizeof(struct usb_cdc_union_descriptor), .bDescriptorType = CS_INTERFACE, .bDescriptorSubtype = USB_CDC_TYPE_UNION, .bControlInterface = 0, .bSubordinateInterface0 = 1, }, }; static const struct usb_interface_descriptor comm_iface[] = {{ .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bInterfaceNumber = 1, .bAlternateSetting = 0, .bNumEndpoints = 1, .bInterfaceClass = USB_CLASS_CDC, .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, .bInterfaceProtocol = USB_CDC_PROTOCOL_AT, .iInterface = 0, .endpoint = comm_endp, .extra = &cdcacm_functional_descriptors, .extralen = sizeof(cdcacm_functional_descriptors), }}; static const struct usb_interface_descriptor data_iface[] = {{ .bLength = USB_DT_INTERFACE_SIZE, .bDescriptorType = USB_DT_INTERFACE, .bInterfaceNumber = 0, .bAlternateSetting = 0, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_DATA, .bInterfaceSubClass = 0, .bInterfaceProtocol = 0, .iInterface = 0, .endpoint = data_endp, }}; static const struct usb_interface ifaces[] = {{ .num_altsetting = 1, .altsetting = data_iface, }, { .num_altsetting = 1, .altsetting = comm_iface, }}; static const struct usb_config_descriptor config = { .bLength = USB_DT_CONFIGURATION_SIZE, .bDescriptorType = USB_DT_CONFIGURATION, .wTotalLength = 0, .bNumInterfaces = 2, .bConfigurationValue = 1, .iConfiguration = 0, .bmAttributes = 0x80, .bMaxPower = 0x32, .interface = ifaces, }; static const char *usb_strings[] = { "Black Sphere Technologies", "CDC-ACM Demo", "DEMO", }; /* Buffer to be used for control requests. */ static uint8_t usbd_control_buffer[128]; static enum usbd_request_return_codes cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf, uint16_t *len, void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req)) { (void)complete; (void)buf; (void)usbd_dev; switch (req->bRequest) { case USB_CDC_REQ_SET_CONTROL_LINE_STATE: { /* * This Linux cdc_acm driver requires this to be implemented * even though it's optional in the CDC spec, and we don't * advertise it in the ACM functional descriptor. */ char local_buf[10]; struct usb_cdc_notification *notif = (void *)local_buf; /* We echo signals back to host as notification. */ notif->bmRequestType = 0xA1; notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE; notif->wValue = 0; notif->wIndex = 0; notif->wLength = 2; local_buf[8] = req->wValue & 3; local_buf[9] = 0; // usbd_ep_write_packet(0x83, buf, 10); return USBD_REQ_HANDLED; } case USB_CDC_REQ_SET_LINE_CODING: if (*len < sizeof(struct usb_cdc_line_coding)) return USBD_REQ_NOTSUPP; return USBD_REQ_HANDLED; } return USBD_REQ_NOTSUPP; } static void cdcacm_data_rx_cb(usbd_device *usbd_dev, uint8_t ep) { (void)ep; (void)usbd_dev; char buf[64]; int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64); if (len) { SEGGER_RTT_printf(0, "TX (%d): ", len); SEGGER_RTT_Write(0, buf, len); SEGGER_RTT_WriteString(0, "\n"); usbd_ep_write_packet(usbd_dev, 0x82, buf, len); } } static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue) { (void)wValue; (void)usbd_dev; usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb); usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL); usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL); usbd_register_control_callback( usbd_dev, USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE, USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT, cdcacm_control_request); } usbd_device *start_cdcacm(void) { usbd_device *usbd_dev; SEGGER_RTT_printf(0, "Configuring USB CDC-ACM device\n"); usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer)); usbd_register_set_config_callback(usbd_dev, cdcacm_set_config); return usbd_dev; }