2013-11-10 03:03 AM
Hello;
My question is about usb-hid protocol which is on stm32f2xx.I have already use hid communcation on my pic32 project.I just use control endpoint in order to send and receive data.No other endpoints are used.without a problem I have been using this code on my pic32.On the stm32fxx I tried to modificate description table as my needs. Even though it is said in this release library can handle only IN traffic, I am able to enable OUT traffic also.But there is a strange problem I couldn't understand.After 1024 data package send from HOST(computer) to device(stm32f2xx) , device doesn't respond and freeze,as I said that each package consists of 64 bytes.How can I make this straight ? Any help will be appreciated.{ USB On-The-Go host and device library - PAGE 39HID user interfaceThe USBD_HID_SendReport can be used by the application to send HID reports, the HID driver, in this release, handles only IN traffic. } #stm32fxx #usb #hid2013-11-19 02:42 AM
Behavior cannot be garanteed in not supported modes.
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2013-11-19 07:08 AM
> After 1024 data package send from HOST(computer) to device(stm32f2xx)
Do you mean, a) you've defined (more than) 1024-bytes Output (Feature) report, and you've sent it over Set_Report request in single call? OR b) you've defined shorter report, and sent a couple of reports over multiple Set_Report requests call? Because of stupid USB SIE design of Synopsis (ST bought it from Synopsis), which binds all IN endpoints into single FIFO, and ''transfer-oriented'' SIE design (not transaction-oriented), IN transfers on STM32F2/F4 easily get in trouble.> Even though it is said in this release library can handle only IN traffic It means HID interrupt IN. The stack doesn't implement HID interrupt OUT. But you may implement HID interrupt OUT endpoint easily, modifying usbd_hid_core.c STM32_USB-Host-Device_Lib_V2.1.0\Libraries\STM32_USB_Device_Library\Class\hid\src\usbd_hid_core.c Tsuneo2013-11-19 07:13 AM
> Behavior cannot be garanteed in not supported modes.
Yah, with this code quality of ST's stack, ''supported'' behavior would not be guaranteed ;-) Tsuneo