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Hi,
I have been testing F2806x USB Bulk Device Example project 'usb_dev_bulk' from TI controlSUITE. The original project source SysCtrlInit() is modified to supply 120MHz to USB inteface and 80MHz to C28 core. The example seems to function as expected.
In some point i tried to send out constant byte stream of data through firmware transmit channel buffer (using USBBufferInfoGet(), USBBufferSpaceAvailable(), USBBufferDataWritten() ) and in the main loop the data is copied to the transmit buffer periodically with frequency that avoids buffer overflow. In current example it seems that the buffer do not empty enough quickly that achieves higher bitrates. The example win side console program 'usb_bulk_example.exe -e' reportst data rate of ~128Kbps.
The USB interface in F28069 is a Full-Speed 12Mbps device that should achieves at least 7Mbps?
Question, is it impossible to achieve several more Mbps than current 128Kbps with Bulk-type data transmission?
In the USB2.0 Specification there is noted that maximum allowed data packet size is 64 bytes where data is transmitted within 1ms frame. So is it impossible to reconfigure the example project in this way to enable more than one 64-byte (multiple of 64-bytes) data payload in 1ms frame?
For now i have experimenting with predefined value of '#define DATA_IN_EP_FIFO_SIZE USB_FIFO_SZ_64' -> '#define DATA_IN_EP_FIFO_SIZE USB_FIFO_SZ_512'
in file 'usbdbulk.c' and recompiled the usblib.lib. And now i can send more bytes than 64-byte with function 'USBDBulkPacketWrite(Device, Txbuffer, size, true)', and it seems that it transmit more than one 64-byte in 1ms frame. This modification works with MS Windows XP drivers, but in Win 7 64-bit, there the Device Manager reports "This device can not start (Code 10)". Did i reconfigurated something out of spec. that driver and hardware do not match with Win 7 drivers?
Default configuration of usb_dev_bulk (#define DATA_IN_EP_FIFO_SIZE USB_FIFO_SZ_512):
Device Descriptor:
bcdUSB: 0x0110
bDeviceClass: 0xFF
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x40 (64)
idVendor: 0x1CBE
idProduct: 0x0003
bcdDevice: 0x0100
iManufacturer: 0x01
0x0409: "Texas Instruments"
iProduct: 0x02
0x0409: "Generic Bulk Device"
iSerialNumber: 0x03
0x0409: "12345678"
bNumConfigurations: 0x01
ConnectionStatus: DeviceConnected
Current Config Value: 0x01
Device Bus Speed: Full
Device Address: 0x01
Open Pipes: 2
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x40 (64)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x40 (64)
bInterval: 0x00
Configuration Descriptor:
wTotalLength: 0x0020
bNumInterfaces: 0x01
bConfigurationValue: 0x01
iConfiguration: 0x05
0x0409: "Bulk Data Configuration"
bmAttributes: 0xC0 (Bus Powered Self Powered )
MaxPower: 0xFA (500 Ma)
Interface Descriptor:
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0xFF
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x04
0x0409: "Bulk Data Interface"
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x40 (64)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x40 (64)
bInterval: 0x00
Non-Default configuration of usb_dev_bulk (#define DATA_IN_EP_FIFO_SIZE USB_FIFO_SZ_512):
bcdUSB: 0x0110
bDeviceClass: 0xFF
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x40 (64)
idVendor: 0x1CBE
idProduct: 0x0003
bcdDevice: 0x0100
iManufacturer: 0x01
0x0409: "Texas Instruments"
iProduct: 0x02
0x0409: "Generic Bulk Device"
iSerialNumber: 0x03
0x0409: "12345678"
bNumConfigurations: 0x01
ConnectionStatus: DeviceConnected
Current Config Value: 0x01
Device Bus Speed: Full
Device Address: 0x01
Open Pipes: 2
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Configuration Descriptor:
wTotalLength: 0x0020
bNumInterfaces: 0x01
bConfigurationValue: 0x01
iConfiguration: 0x05
0x0409: "Bulk Data Configuration"
bmAttributes: 0xC0 (Bus Powered Self Powered )
MaxPower: 0xFA (500 Ma)
Interface Descriptor:
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0xFF
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x04
0x0409: "Bulk Data Interface"
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Marko,
Tallinn University of Technology,
