diff options
Diffstat (limited to 'usb/usb_protocol.c')
| -rw-r--r-- | usb/usb_protocol.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/usb/usb_protocol.c b/usb/usb_protocol.c new file mode 100644 index 0000000..9f6323e --- /dev/null +++ b/usb/usb_protocol.c @@ -0,0 +1,161 @@ +/** + * \file + * + * \brief USB protocol implementation. + * + * This file contains the USB definitions and data structures provided by the + * USB 2.0 specification. + * + * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries. + * + * \asf_license_start + * + * \page License + * + * Subject to your compliance with these terms, you may use Microchip + * software and any derivatives exclusively with Microchip products. + * It is your responsibility to comply with third party license terms applicable + * to your use of third party software (including open source software) that + * may accompany Microchip software. + * + * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, + * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, + * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, + * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE + * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL + * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE + * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE + * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT + * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY + * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, + * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE. + * + * \asf_license_stop + */ + +#define CONF_NO_ASSERT_CHECK + +#include "usb_protocol.h" + +#ifdef CONF_NO_ASSERT_CHECK +#define _param_error_check(cond) +#define _desc_len_check() \ + if (usb_desc_len(desc) < 2) { \ + /* Encounter an invalid descriptor. */ \ + return NULL; \ + } +#else +#define _param_error_check(cond) ASSERT(cond) +#define _desc_len_check() ASSERT(usb_desc_len(desc) >= 2) +#endif + +uint8_t *usb_find_desc(uint8_t *desc, uint8_t *eof, uint8_t type) +{ + _param_error_check(desc && eof && (desc < eof)); + + while (desc < eof) { + _desc_len_check(); + if (type == usb_desc_type(desc)) { + return desc; + } + desc = usb_desc_next(desc); + } + return NULL; +} + +uint8_t *usb_find_iface_after(uint8_t *desc, uint8_t *eof, uint8_t iface_n) +{ + _param_error_check(desc && eof && (desc < eof)); + + while (desc < eof) { + _desc_len_check(); + if (USB_DT_INTERFACE == usb_desc_type(desc)) { + if (iface_n != desc[2]) { + return desc; + } + } + desc = usb_desc_next(desc); + } + return eof; +} + +uint8_t *usb_find_ep_desc(uint8_t *desc, uint8_t *eof) +{ + _param_error_check(desc && eof && (desc < eof)); + + while (desc < eof) { + _desc_len_check(); + if (USB_DT_INTERFACE == usb_desc_type(desc)) { + break; + } + if (USB_DT_ENDPOINT == usb_desc_type(desc)) { + return desc; + } + desc = usb_desc_next(desc); + } + return NULL; +} + +uint8_t *usb_find_cfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value) +{ + _param_error_check(desc && eof && (desc < eof)); + + desc = usb_find_desc(desc, eof, USB_DT_CONFIG); + if (!desc) { + return NULL; + } + while (desc < eof) { + _desc_len_check(); + if (desc[1] != USB_DT_CONFIG) { + break; + } + if (desc[5] == cfg_value) { + return desc; + } + desc = usb_cfg_desc_next(desc); + } + return NULL; +} + +uint8_t *usb_find_othspdcfg_desc(uint8_t *desc, uint8_t *eof, uint8_t cfg_value) +{ + _param_error_check(desc && eof && (desc < eof)); + + desc = usb_find_desc(desc, eof, USB_DT_OTHER_SPEED_CONFIG); + if (!desc) { + return NULL; + } + while (desc < eof) { + _desc_len_check(); + if (desc[1] != USB_DT_OTHER_SPEED_CONFIG) { + break; + } + if (desc[5] == cfg_value) { + return desc; + } + desc = usb_cfg_desc_next(desc); + } + return NULL; +} + +uint8_t *usb_find_str_desc(uint8_t *desc, uint8_t *eof, uint8_t str_index) +{ + uint8_t i; + + _param_error_check(desc && eof && (desc < eof)); + + for (i = 0; desc < eof;) { + desc = usb_find_desc(desc, eof, USB_DT_STRING); + if (desc) { + _desc_len_check(); + if (i == str_index) { + return desc; + } + i++; + desc = usb_desc_next(desc); + } else { + return NULL; + } + } + return NULL; +} |