超微服务器740GP-TNRT(主板为X12DPG-QT6)在重启后,卡在开机界面"DXE -- USB Initialization"无法进入系统,右下角显示代码"68",同时无法进入BIOS,故几乎无法进行任何操作。 出现这种问题的具体原因不明,仅在超微官网"技术支持-网上支持-搜索FAQ(usb initialization)"中找到两个相关的cases(FAQ ID: 36147 & 36010...
· 链路初始化和流程控制(Link initialization and flow control); · 链路电源管理(Link power management); · 链路错误规则和恢复(Link error rules/recovery); · 复位(Resets); · LTSSM规范(LTSSM specifications)。 USB超高速协议层 该层主要实现下面的功能: · 数据包类型(Types of packets); · 数据包...
voidVirtual_Com_Port_Reset(void) {/*Set Virtual_Com_Port DEVICE as not configured 还没被配置*/pInformation->Current_Configuration =0;//当前配置为0/*Current Feature initialization*/pInformation->Current_Feature = Virtual_Com_Port_ConfigDescriptor[7];//需要总线供电/*Set Virtual_Com_Port DEVICE ...
The host issues standard USB requests to obtain a set of standard USB descriptors for the device. The relevant portions of those descriptors are given below. See the USB Specification for generic USB device initialization.Feedback Was this page helpful? Yes No Provide product feedback | Get he...
ESP_LOGI(TAG, "USB initialization"); const tinyusb_config_t tusb_cfg = { .device_descriptor = NULL, .string_descriptor = NULL, .external_phy = false, .configuration_descriptor = NULL, }; // 初始化TinyUSB驱动 ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg)); ...
链路初始化和流程控制(Link initialization and flow control) 链路电源管理(Link power management) 链路错误规则和恢复(Link error rules/recovery) 复位(Resets) LTSSM规范(LTSSM specifications) 7.1 字节序 【Byte Ordering】 包或链路命令的多字节字段以小端(little-endian)顺序在总线上搬移, 即最低有效字节(LSB)...
讲解了usb3链路层,并详细分析了link initialization和link training。讲解了LTSSM状态机,以及link management和flow control。最后,对SS/HS的切换过程做了介绍。 第七课. usb3 protocol level and controller 讲解了usb3的协议层,并针对usb3的数据格式以及传输类型,做了详细的讲解...
LOG_ERROR("libusbinitializationfailed:%s",libusb_strerror(err)); returnERROR_FAIL; } intnum_devices=libusb_get_device_list(ctx,&device_list); if(num_devices< 0) { LOG_ERROR("could not enumerate USB devices: %s", libusb_strerror(num_devices)); ...
This function is where pClassData is assigned to a Non-NULL value, but it is never called from the initialization routines. This causes me to hang up at while(hUsbDeviceFS.pClassData == NULL); in main.c . I realize USBD_CDC_Init is set up as a call back and is ma...
其实低功耗时link已经断路了,从低功耗回到正常状态需要重新training和initialization,但是都重来必然有等待时间,所以在浅睡的情况下,恢复链路可以发送快速训练ordered-set来代替,这就是FTS。 symbol4 rate ID,上面提到的速率协商,代表链路希望支持多块的速率。 symbol5 training control,控制位,表明这个TS1orTS2到底是...