5.39. CDC ACM Host

5.39.1. 概述

本示例工程展示USB CDC ACM HOST示例。

5.39.2. 硬件设置

  • 需要两块开发板，一块板子作为CDC ACM Host，另一块板子作为CDC ACM Device。

  • CDC ACM Device的sample的路径为：samples/cherryusb/device/cdc_acm/cdc_acm_vcom。Host即为本示例。

  • 将Host和Device的USB0端口相连接。

5.39.3. 运行现象

  • 将程序下载至开发板运行，使用串口调试助手查看输出log。

  • 按压Host开发板的PBUT或USER_KEYA按键，HOST将会发出“HPMicro”字符串给Device，Device收到后，将返回“HPMicro”字符串给Host。

Start usb host task...
[I/USB] EHCI HCIVERSION:0x0100
[I/USB] EHCI HCSPARAMS:0x010011
[I/USB] EHCI HCCPARAMS:0x0006
[I/USB] EHCI ppc:1, n_ports:1, n_cc:0, n_pcc:0
[I/USB] EHCI uses tt for ls/fs device
[I/usbh_hub] New high-speed device on Bus 0, Hub 1, Port 1 connected
[I/usbh_core] New device found,idVendor:34b7,idProduct:ffff,bcdDevice:0100
[I/usbh_core] The device has 1 bNumConfigurations
[I/usbh_core] The device has 2 interfaces
[I/usbh_core] Enumeration success, start loading class driver
[I/usbh_core] Loading cdc_acm class driver
[I/usbh_cdc_acm] Ep=01 Attr=02 Mps=512 Interval=00 Mult=00
[I/usbh_cdc_acm] Ep=81 Attr=02 Mps=512 Interval=00 Mult=00
[I/usbh_cdc_acm] Register CDC ACM Class:/dev/ttyACM0
[I/usbh_core] Loading cdc_data class driver
send length:8
receive length:8
receive data: HPMicro

send length:8
receive length:8
receive data: HPMicro

send length:8
receive length:8
receive data: HPMicro

send length:8
receive length:8
receive data: HPMicro