AM2434: the speed of DFU-USB downloading is different on the different window PC

Hi Tan,

tan bao said:

I found that the speed of DFU-USB downloading  is different on the different window PC,There is a significant difference in speed. 

    The normal speed is 110 Kbit/s.  However, on some computers, the speed is only 30Kbit/s. 

the same zadig.exe and util-dfu tool, and the same usb_dfu_uniflash.py to download the same size file(32MB),  and the same am2434 device and the same usb cable.

This statement itself tells that there are no problem in the zadig.exe, dfu-util software as well the USB DFU driver provided by TI. So the problem is from the USB host used which in your case is the PC(either windows or Linux). This is not related to device drivers and hence out of support topic for TI. 

Regards,

Tushar

To work with DFU, we only need dfu-util binaries, zadig software. Please refer INSTALL_DFU_UTIL 

No additional configuration on the host side are required for increasing the DFU speed and such steps are also not mentioned in the SDK docs as well. Please refer TOOLS_FLASH_DFU_UNIFLASH 

Regards,

Tushar

Hi Kevin,

I have tried on my side as well. I was also getting the same ~28 KBps speed of dfu transfer. The ~113 KBps speed was on the U-boot DFU.

Meanwhile, I found a workaround for this issue, there is tud_dfu_get_timeout_cb API in the USB DFU Uniflash example which return the timeout value for wait before next DFU Download. This was done to perform the operation synchronously. As we are using memcpy to copy the data hence you can return the timeout as 0 as we don't need to wait. Memcpy operation are mostly synchronous.

Please update the code as below and rebuilt the DFU Uniflash. 

uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state)
{
  if ( state == DFU_DNBUSY )
  {
	  /* as of now we support only flash memory */ 
	//   return 1 ; 
  }
  return 0;
}

Once the DFU Uniflash is rebuilt, update the path in default_dfu_ospi.cfg file. 

Re-run the usb_dfu_uniflash script and let me know if you see improvements.

Regards,

Tushar 

Hi Tan,

Thank you for the confirmation. Marking the thread as resolved.

Regards,

Tushar