We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
In Keil's Run Time Environment
I will only use USB Port I use it as virtual com.
When I coding USB Host Virtual com as usbh cdc acm, usart port included, why??
////////////////////////// extern ARM_DRIVER_USART Driver_USART9; #define ptrUART_USB (&Driver_USART9) ////////////////////////
In keil's "manage run time environment" configure mcu : stm32f207vc CMSIS : core RTOS : Keil RTX CMSIS Driver : USART(API) : CDC, USART USB Host(API) : Full Speed Device : CStartup, classic Device : common,Cortex,DMA,GPIO,RCC USB : Host :CDC
Hi Milorad Cvjetkovic
Thanks for your reply
//////////////////////////////////////////////////////////
I use sample program "">www.keil.com/.../host_cdc_tutorial.html"
My problem is "USBH_CDC_ACM_GetDeviceStatus" function is not working, May be can't detect usb device connection
How can I fix When I use keil debugger, i can't debug into.
In these sample i don't use MCBSTM32F400 board and STM32F407IGHx mcu I use stm32f207vct mcu and my own board equipped with USB
When I make cdc host and cdc device program using CubeMX, connect board each other via USB port using my board
usb detection, send data and receive : USBH_CDC_Transmit,USBH_CDC_Receive, CDC_Transmit_FS function working very good
Hi Hojin,
What is your CDC device that you want to communicate to with USB Host? Is it perhaps some USB Mobile Network adapter?
My ultimate goal is that my device can communicate with USB device that has vendor specific class but protocol of USB device is a serial, text-based protocol
that USB device only require but vendor specific class. 8 data bits; no parity bits; 1 stop bit; 19200 baud rate.
Does this "USBH CDC ACM Virtual Com Example" not support it ??? Do I must know if USB has vendor specific class protocol ?
Thanks.
you should take a look at following documentation page: www.keil.com/.../host_cust_tutorial.html
it explains how USB Host is used with Prolific PL2303 USB-to-UART dongle, that device also uses Vendor Specific class.
And yes, you can not use CDC for communicating with such a device as Vendor Specific means it is not standardized so you need to know the protocol, CDC device is standardized.