TMS320F28377D: USB USB flash kernerls example

vladimir ki

Part Number: TMS320F28377D
Other Parts Discussed in Thread: C2000WARE

Hello,

Im running example F2837xD_usb_flash_kernels_cpu01 from C2000Ware_3_02_00_00 with build config DUAL from RAM on ControlCard R1.3. I have not made any changes

I'm surprised by the strange strange behavior.

When I run the example usb_ex4_dev_bulk before this, and then without turning off the power and without disconnecting the USB cable I start F2837xD_usb_flash_kernels_cpu01, then I see "TMS320F2837xD USB Boot Loader" which works
(I made sure applications are working command field
usb_flash_programmer.exe app_cpu1.dat kern_cpu2.dat app_cpu2.dat)
But when I boot F2837xD_usb_flash_kernels_cpu01 after clean RAM and inactive CPU device is not detected "Unknow device"

It doesn't even depend on the host. Same when I repeat the experiment with external power supply (not from USB) and insert the cord after starting the applications.

What does preloading and running the Generic Bulk Device do and what changes, after which the device "TMS320F2837xD USB Boot Loader" starts to be detected.
What needs to be changed to get the job done without this preloading.

My ultimate goal is to port F2837xD_usb_flash_kernels_cpu01 to flash and create a bootloader.

Best regards

over 5 years ago

0 vladimir ki over 5 years ago

Prodigy 100 points

I think I found the reason. These were commented lines

ClkCfgRegs.CLKSRCCTL1.bit.OSCCLKSRCSEL = 0x0; //Use INTOSC2 (~10 MHz)

and

ClkCfgRegs.CLKSRCCTL2.bit.AUXOSCCLKSRCSEL = 0x1;

I uncommented them and the example started to run.

But now the device is detected only after the second run of main () (the "Restart" in CCS Debug Session"). When you first start up after turning off the power, no device is detected at all. The host PC does not sense the connection at all. I would be grateful if you tell me why. I plan to check registers.

0 Siddharth Deshpande over 5 years ago in reply to vladimir ki

TI__Mastermind 36305 points

Hi ,

Is the code running from RAM or from Flash? Looks like the code is running from RAM since after turning off/on the power , the code does not work/execute.

Best Regards

Siddharth

0 vladimir ki over 5 years ago in reply to Siddharth Deshpande

Prodigy 100 points

I am sorry. I didn't say it correctly.

1) Turn off the power and turn on
2) Download the code to RAM
3) Run the code
It doesn't work! (PC doesn't sense the device at all)
4) Restart the code in this debug session
It's working! (device detected correctly)

Why it might not work the first time (3) and work the second time(4).

0 vladimir ki over 5 years ago in reply to vladimir ki

Prodigy 100 points

I think I found resolve my issue. If add delay in clock configuration in USB_Boot.c.

ClkCfgRegs.CLKSRCCTL2.bit.AUXOSCCLKSRCSEL = 0x1;

for(x = 0; x < 32767; x++)
{
asm(" NOP");
asm(" NOP");
}

ClkCfgRegs.AUXPLLMULT.all = 6;

If add this delay up by code or down by code, then example does not work. But I wonder why the delay is necessary.

I didn't make any other changes to the code. This is my USB_Boot.c

/cfs-file/__key/communityserver-discussions-components-files/171/5670.USB_5F00_Boot.c

0 Siddharth Deshpande over 5 years ago in reply to vladimir ki

TI__Mastermind 36305 points

Hi,

Glad that you were able to resolve the issue.

Best Regards

Siddharth

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TMS320F28377D: USB USB flash kernerls example