Kévin Redon | 69b92d9 | 2019-01-24 16:39:20 +0100 | [diff] [blame] | 1 | /** |
| 2 | * \file |
| 3 | * |
| 4 | * \brief USB protocol implementation. |
| 5 | * |
| 6 | * This file contains the USB definitions and data structures provided by the |
| 7 | * USB 2.0 specification. |
| 8 | * |
| 9 | * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries. |
| 10 | * |
| 11 | * \asf_license_start |
| 12 | * |
| 13 | * \page License |
| 14 | * |
| 15 | * Subject to your compliance with these terms, you may use Microchip |
| 16 | * software and any derivatives exclusively with Microchip products. |
| 17 | * It is your responsibility to comply with third party license terms applicable |
| 18 | * to your use of third party software (including open source software) that |
| 19 | * may accompany Microchip software. |
| 20 | * |
| 21 | * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, |
| 22 | * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, |
| 23 | * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, |
| 24 | * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE |
| 25 | * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL |
| 26 | * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE |
| 27 | * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE |
| 28 | * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT |
| 29 | * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY |
| 30 | * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, |
| 31 | * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE. |
| 32 | * |
| 33 | * \asf_license_stop |
| 34 | */ |
| 35 | |
| 36 | #define CONF_NO_ASSERT_CHECK |
| 37 | |
| 38 | #include "usb_protocol.h" |
| 39 | |
| 40 | #ifdef CONF_NO_ASSERT_CHECK |
| 41 | #define _param_error_check(cond) |
| 42 | #define _desc_len_check() \ |
| 43 | if (usb_desc_len(desc) < 2) { \ |
| 44 | /* Encounter an invalid descriptor. */ \ |
| 45 | return NULL; \ |
| 46 | } |
| 47 | #else |
| 48 | #define _param_error_check(cond) ASSERT(cond) |
| 49 | #define _desc_len_check() ASSERT(usb_desc_len(desc) >= 2) |
| 50 | #endif |
| 51 | |
| 52 | uint8_t *usb_find_desc(uint8_t *desc, uint8_t *eof, uint8_t type) |
| 53 | { |
| 54 | _param_error_check(desc && eof && (desc < eof)); |
| 55 | |
| 56 | while (desc < eof) { |
| 57 | _desc_len_check(); |
| 58 | if (type == usb_desc_type(desc)) { |
| 59 | return desc; |
| 60 | } |
| 61 | desc = usb_desc_next(desc); |
| 62 | } |
| 63 | return NULL; |
| 64 | } |
| 65 | |
| 66 | uint8_t *usb_find_iface_after(uint8_t *desc, uint8_t *eof, uint8_t iface_n) |
| 67 | { |
| 68 | _param_error_check(desc && eof && (desc < eof)); |
| 69 | |
| 70 | while (desc < eof) { |
| 71 | _desc_len_check(); |
| 72 | if (USB_DT_INTERFACE == usb_desc_type(desc)) { |
| 73 | if (iface_n != desc[2]) { |
| 74 | return desc; |
| 75 | } |
| 76 | } |
| 77 | desc = usb_desc_next(desc); |
| 78 | } |
| 79 | return eof; |
| 80 | } |
| 81 | |
| 82 | uint8_t *usb_find_ep_desc(uint8_t *desc, uint8_t *eof) |
| 83 | { |
| 84 | _param_error_check(desc && eof && (desc < eof)); |
| 85 | |
| 86 | while (desc < eof) { |
| 87 | _desc_len_check(); |
| 88 | if (USB_DT_INTERFACE == usb_desc_type(desc)) { |
| 89 | break; |
| 90 | } |
| 91 | if (USB_DT_ENDPOINT == usb_desc_type(desc)) { |
| 92 | return desc; |
| 93 | } |
| 94 | desc = usb_desc_next(desc); |
| 95 | } |
| 96 | return NULL; |
| 97 | } |
| 98 | |
| 99 | uint8_t *usb_find_cfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value) |
| 100 | { |
| 101 | _param_error_check(desc && eof && (desc < eof)); |
| 102 | |
| 103 | desc = usb_find_desc(desc, eof, USB_DT_CONFIG); |
| 104 | if (!desc) { |
| 105 | return NULL; |
| 106 | } |
| 107 | while (desc < eof) { |
| 108 | _desc_len_check(); |
| 109 | if (desc[1] != USB_DT_CONFIG) { |
| 110 | break; |
| 111 | } |
| 112 | if (desc[5] == cfg_value) { |
| 113 | return desc; |
| 114 | } |
| 115 | desc = usb_cfg_desc_next(desc); |
| 116 | } |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | uint8_t *usb_find_othspdcfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value) |
| 121 | { |
| 122 | _param_error_check(desc && eof && (desc < eof)); |
| 123 | |
| 124 | desc = usb_find_desc(desc, eof, USB_DT_OTHER_SPEED_CONFIG); |
| 125 | if (!desc) { |
| 126 | return NULL; |
| 127 | } |
| 128 | while (desc < eof) { |
| 129 | _desc_len_check(); |
| 130 | if (desc[1] != USB_DT_OTHER_SPEED_CONFIG) { |
| 131 | break; |
| 132 | } |
| 133 | if (desc[5] == cfg_value) { |
| 134 | return desc; |
| 135 | } |
| 136 | desc = usb_cfg_desc_next(desc); |
| 137 | } |
| 138 | return NULL; |
| 139 | } |
| 140 | |
| 141 | uint8_t *usb_find_str_desc(uint8_t *desc, uint8_t *eof, uint8_t str_index) |
| 142 | { |
| 143 | uint8_t i; |
| 144 | |
| 145 | _param_error_check(desc && eof && (desc < eof)); |
| 146 | |
| 147 | for (i = 0; desc < eof;) { |
| 148 | desc = usb_find_desc(desc, eof, USB_DT_STRING); |
| 149 | if (desc) { |
| 150 | _desc_len_check(); |
| 151 | if (i == str_index) { |
| 152 | return desc; |
| 153 | } |
| 154 | i++; |
| 155 | desc = usb_desc_next(desc); |
| 156 | } else { |
| 157 | return NULL; |
| 158 | } |
| 159 | } |
| 160 | return NULL; |
| 161 | } |