/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2018 hathach for Adafruit Industries * * 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. */ #include "lib/tinyusb/src/tusb.h" #include "py/objstr.h" #include "py/runtime.h" #include "supervisor/memory.h" #include "supervisor/usb.h" #if CIRCUITPY_USB_CDC #include "shared-bindings/usb_cdc/__init__.h" #endif #if CIRCUITPY_USB_HID #include "shared-bindings/usb_hid/__init__.h" #endif #if CIRCUITPY_USB_MIDI #include "shared-bindings/usb_midi/__init__.h" #endif #if CIRCUITPY_USB_MSC && CIRCUITPY_STORAGE #include "shared-bindings/storage/__init__.h" #endif #include "shared-bindings/microcontroller/Processor.h" // Table for collecting interface strings (interface names) as descriptor is built. // We reuse the same table after collection, replacing the char string pointers with le16 string pointers. #define MAX_INTERFACE_STRINGS 16 // slot 0 is always the Language ID typedef union { const char *char_str; const uint16_t *descriptor; } interface_string_t; static interface_string_t collected_interface_strings[MAX_INTERFACE_STRINGS]; static size_t collected_interface_strings_length; static uint8_t current_interface_string; static supervisor_allocation *device_descriptor_allocation; static supervisor_allocation *configuration_descriptor_allocation; static supervisor_allocation *string_descriptors_allocation; static const char manufacturer_name[] = USB_MANUFACTURER; static const char product_name[] = USB_PRODUCT; // Serial number string is UID length * 2 (2 nibbles per byte) + 1 byte for null termination. static char serial_number_hex_string[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH * 2 + 1]; static const uint8_t device_descriptor_template[] = { 0x12, // 0 bLength 0x01, // 1 bDescriptorType (Device) 0x00, 0x02, // 2,3 bcdUSB 2.00 0x00, // 4 bDeviceClass (Use class information in the Interface Descriptors) 0x00, // 5 bDeviceSubClass 0x00, // 6 bDeviceProtocol 0x40, // 7 bMaxPacketSize0 64 0xFF, 0xFF, // 8,9 idVendor [SET AT RUNTIME: lo,hi] #define DEVICE_VID_LO_INDEX (8) #define DEVICE_VID_HI_INDEX (9) 0xFF, 0xFF, // 10,11 idProduct [SET AT RUNTIME: lo,hi] #define DEVICE_PID_LO_INDEX (10) #define DEVICE_PID_HI_INDEX (11) 0x00, 0x01, // 12,13 bcdDevice 2.00 0xFF, // 14 iManufacturer (String Index) [SET AT RUNTIME] #define DEVICE_MANUFACTURER_STRING_INDEX (14) 0xFF, // 15 iProduct (String Index) [SET AT RUNTIME] #define DEVICE_PRODUCT_STRING_INDEX (15) 0xFF, // 16 iSerialNumber (String Index) [SET AT RUNTIME] #define DEVICE_SERIAL_NUMBER_STRING_INDEX (16) 0x01, // 17 bNumConfigurations 1 }; static const uint8_t configuration_descriptor_template[] = { 0x09, // 0 bLength 0x02, // 1 bDescriptorType (Configuration) 0xFF, 0xFF, // 2,3 wTotalLength [SET AT RUNTIME: lo, hi] #define CONFIG_TOTAL_LENGTH_LO_INDEX (2) #define CONFIG_TOTAL_LENGTH_HI_INDEX (3) 0xFF, // 4 bNumInterfaces [SET AT RUNTIME] #define CONFIG_NUM_INTERFACES_INDEX (4) 0x01, // 5 bConfigurationValue 0x00, // 6 iConfiguration (String Index) 0x80, // 7 bmAttributes 0x32, // 8 bMaxPower 100mA }; static void usb_build_device_descriptor(uint16_t vid, uint16_t pid) { device_descriptor_allocation = allocate_memory(align32_size(sizeof(device_descriptor_template)), /*high_address*/ false, /*movable*/ false); uint8_t *device_descriptor = (uint8_t *) device_descriptor_allocation->ptr; memcpy(device_descriptor, device_descriptor_template, sizeof(device_descriptor_template)); device_descriptor[DEVICE_VID_LO_INDEX] = vid & 0xFF; device_descriptor[DEVICE_VID_HI_INDEX] = vid >> 8; device_descriptor[DEVICE_PID_LO_INDEX] = pid & 0xFF; device_descriptor[DEVICE_PID_HI_INDEX] = pid >> 8; usb_add_interface_string(current_interface_string, manufacturer_name); device_descriptor[DEVICE_MANUFACTURER_STRING_INDEX] = current_interface_string; current_interface_string++; usb_add_interface_string(current_interface_string, product_name); device_descriptor[DEVICE_PRODUCT_STRING_INDEX] = current_interface_string; current_interface_string++; usb_add_interface_string(current_interface_string, serial_number_hex_string); device_descriptor[DEVICE_SERIAL_NUMBER_STRING_INDEX] = current_interface_string; current_interface_string++; } static void usb_build_configuration_descriptor(void) { size_t total_descriptor_length = sizeof(configuration_descriptor_template); // CDC should be first, for compatibility with Adafruit Windows 7 drivers. // In the past, the order has been CDC, MSC, MIDI, HID, so preserve that order. #if CIRCUITPY_USB_CDC if (usb_cdc_repl_enabled()) { total_descriptor_length += usb_cdc_descriptor_length(); } if (usb_cdc_data_enabled()) { total_descriptor_length += usb_cdc_descriptor_length(); } #endif #if CIRCUITPY_USB_MSC if (storage_usb_enabled()) { total_descriptor_length += storage_usb_descriptor_length(); } #endif #if CIRCUITPY_USB_HID if (usb_hid_enabled()) { total_descriptor_length += usb_hid_descriptor_length(); } #endif #if CIRCUITPY_USB_MIDI if (usb_midi_enabled()) { total_descriptor_length += usb_midi_descriptor_length(); } #endif // Now we now how big the configuration descriptor will be, so we can allocate space for it. configuration_descriptor_allocation = allocate_memory(align32_size(total_descriptor_length), /*high_address*/ false, /*movable*/ false); uint8_t *configuration_descriptor = (uint8_t *) configuration_descriptor_allocation->ptr; // Copy the template, which is the first part of the descriptor, and fix up its length. memcpy(configuration_descriptor, configuration_descriptor_template, sizeof(configuration_descriptor_template)); configuration_descriptor[CONFIG_TOTAL_LENGTH_LO_INDEX] = total_descriptor_length & 0xFF; configuration_descriptor[CONFIG_TOTAL_LENGTH_HI_INDEX] = (total_descriptor_length >> 8) & 0xFF; // Number interfaces and endpoints. // Endpoint 0 is already used for USB control, so start with 1. uint8_t current_interface = 0; uint8_t current_endpoint = 1; uint8_t *descriptor_buf_remaining = configuration_descriptor + sizeof(configuration_descriptor_template); #if CIRCUITPY_USB_CDC if (usb_cdc_repl_enabled()) { // Concatenate and fix up the CDC REPL descriptor. descriptor_buf_remaining += usb_cdc_add_descriptor( descriptor_buf_remaining, ¤t_interface, ¤t_endpoint, ¤t_interface_string, true); } if (usb_cdc_data_enabled()) { // Concatenate and fix up the CDC data descriptor. descriptor_buf_remaining += usb_cdc_add_descriptor( descriptor_buf_remaining, ¤t_interface, ¤t_endpoint, ¤t_interface_string, false); } #endif #if CIRCUITPY_USB_MSC if (storage_usb_enabled()) { // Concatenate and fix up the MSC descriptor. descriptor_buf_remaining += storage_usb_add_descriptor( descriptor_buf_remaining, ¤t_interface, ¤t_endpoint, ¤t_interface_string); } #endif #if CIRCUITPY_USB_HID if (usb_hid_enabled()) { descriptor_buf_remaining += usb_hid_add_descriptor( descriptor_buf_remaining, ¤t_interface, ¤t_endpoint, ¤t_interface_string, usb_hid_report_descriptor_length()); } #endif #if CIRCUITPY_USB_MIDI if (usb_midi_enabled()) { // Concatenate and fix up the MIDI descriptor. descriptor_buf_remaining += usb_midi_add_descriptor( descriptor_buf_remaining, ¤t_interface, ¤t_endpoint, ¤t_interface_string); } #endif // Now we know how many interfaces have been used. configuration_descriptor[CONFIG_NUM_INTERFACES_INDEX] = current_interface; // Did we run out of endpoints? if (current_endpoint - 1 > USB_NUM_EP) { mp_raise_RuntimeError(translate("Not enough USB endpoints")); } } // str must not be on the heap. void usb_add_interface_string(uint8_t interface_string_index, const char str[]) { if (interface_string_index > MAX_INTERFACE_STRINGS) { mp_raise_RuntimeError(translate("Too many USB interface names")); } collected_interface_strings[interface_string_index].char_str = str; collected_interface_strings_length += strlen(str); } static void usb_build_interface_string_table(void) { // Allocate space for the le16 String descriptors. // Space needed is 2 bytes for String Descriptor header, then 2 bytes for each character string_descriptors_allocation = allocate_memory(align32_size(current_interface_string * 2 + collected_interface_strings_length * 2), /*high_address*/ false, /*movable*/ false); uint16_t *string_descriptors = (uint16_t *) string_descriptors_allocation->ptr; uint16_t *string_descriptor = string_descriptors; // Language ID is always the 0th string descriptor. collected_interface_strings[0].descriptor = (uint16_t[]) { 0x0304, 0x0409, }; // Build the le16 versions of all the descriptor strings. // Start at 1 to skip the Language ID. for (uint8_t string_index = 1; string_index < current_interface_string; string_index++) { const char *str = collected_interface_strings[string_index].char_str; const size_t str_len = strlen(str); uint8_t descriptor_size = 2 + (str_len * 2); string_descriptor[0] = 0x0300 | descriptor_size; // Convert to le16. for (size_t i = 0; i <= str_len; i++) { string_descriptor[i + 1] = str[i]; } // Save ptr to string descriptor with le16 str. collected_interface_strings[string_index].descriptor = string_descriptor; // Move to next descriptor slot. string_descriptor += descriptor_size; } } // After boot.py runs, the USB devices to be used have been chosen, and the descriptors can be set up. // This is called after the VM is finished, because it uses storage_allocations. void usb_build_descriptors(void) { uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH]; common_hal_mcu_processor_get_uid(raw_id); for (int i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) { for (int j = 0; j < 2; j++) { uint8_t nibble = (raw_id[i] >> (j * 4)) & 0xf; serial_number_hex_string[i * 2 + (1 - j)] = nibble_to_hex_upper[nibble]; } } // Null-terminate the string. serial_number_hex_string[sizeof(serial_number_hex_string) - 1] = '\0'; current_interface_string = 1; collected_interface_strings_length = 0; usb_build_device_descriptor(USB_VID, USB_PID); usb_build_configuration_descriptor(); usb_build_interface_string_table(); } // Invoked when GET DEVICE DESCRIPTOR is received. // Application return pointer to descriptor uint8_t const *tud_descriptor_device_cb(void) { return (uint8_t *) device_descriptor_allocation->ptr; } // Invoked when GET CONFIGURATION DESCRIPTOR is received. // Application return pointer to descriptor // Descriptor contents must exist long enough for transfer to complete uint8_t const *tud_descriptor_configuration_cb(uint8_t index) { (void)index; // for multiple configurations return (uint8_t *) configuration_descriptor_allocation->ptr; } // Invoked when GET STRING DESCRIPTOR request is received. // Application return pointer to descriptor, whose contents must exist long enough for transfer to complete uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) { if (index > MAX_INTERFACE_STRINGS) { return NULL; } return collected_interface_strings[index].descriptor; }