Posted on November 12, 2014 at 08:42Hello,
I am interested to make USB HID HOST which can communicate with custom hid device instead of mice or keyboard.
For that I have to send data to that custom hid device.
I have used below fuction for dataout
USBH_InterruptSendData (pdev, (unsigned char *)&HID_Machine.buff, HID_Machine.length, HID_Machine.hc_num_out);
I am only doing out transaction form Host(STM32) to device. Everything is perfect and working fine up to 14th frame but 15th frame get corrupted, I have analyzer showing ''child has an error''. So I am unable to understand the cause of issue, is it memory overflow at host?
If I continue data transmission with new data then host is sending old data packet onwards
I used dual core example for ST and modified USBH_HID_Handle() as below (Only two cases are shown here)
case HID_SEND_DATA:
while(USB_OTG_IsEvenFrame(pdev) == FALSE);
USBH_InterruptSendData (pdev, (unsigned char *)&HID_Machine.buff, HID_Machine.length, HID_Machine.hc_num_out);
HID_Machine.state = HID_BUSY;
HID_Machine.timer = HCD_GetCurrentFrame(pdev);
break;
case HID_BUSY:
if(( HCD_GetCurrentFrame(pdev) - HID_Machine.timer) >= HID_Machine.poll)
{
HID_Machine.state = HID_SEND_DATA;
//Retry++; //1
}
else if(HCD_GetURB_State(pdev , HID_Machine.hc_num_out) == URB_DONE) //last transaction was successful or not(USB request Block)
{
HID_Machine.state = HID_GET_DATA;
BD_Data_Sent_Flag=1;
}
else if(HCD_GetURB_State(pdev, HID_Machine.hc_num_out) == URB_STALL )
{
if( (USBH_ClrFeature(pdev, pphost, HID_Machine.ep_addr, HID_Machine.hc_num_out)) == USBH_OK)
{
HID_Machine.state = HID_SEND_DATA;
}
}
break;
#hid #host #stm32
