topic Re: Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive? in Kinetis Microcontrollers

Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive?

rhana — Tue, 12 Aug 2014 19:08:32 GMT

Hello,

I have been able to build the example project "MK20DX256VLL7_msd_mfs_generic_host" from USB 4.1.1 in codewarrior 10.6 and I can load it onto the board through the debugger. I am using the TWR-K20D72M. I have disconnected the TWR-ELEV and TWR-SER (so im just using it as stand alone.) Jumpers J16 1&2 and 5&6 are connected. J2 1&2 and also J20 1&2 are set.

There is no USB activity. A USB stick is plugged into the device and there is no illumination, there is no blinking of any kind, it appears as though the USB port is dead. Would this indicate the USB stick is incompatible? Do I need to try a couple other USB sticks until I find one that works?

Can you suggest how I would debug this? What should I be looking at? Where should I start ?(the hardware looks fine, resistors are in the right places, power is being sent to the micro-AB connector.)

Thanks.

Re: Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive?

rhana — Tue, 12 Aug 2014 22:24:32 GMT

Update

So I tried putting the TWR-SER board on. The Program will run until a Data-Stick is inserted. Next the debugger will break in "vectors.c" at the following line

void Cpu_Interrupt(void)

{

printf("\n\rISR is entered on vector number 0x%x\n\r", (*(volatile uint8_t*)(0xE000ED04)));

}

and it prints out the following message in Hyperterminal:

"ISR is entered on vector number 0x3"

Any clues on this?

Re: Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive?

rhana — Tue, 12 Aug 2014 23:29:02 GMT

This post helped:

Trouble with HOST HID examples

https://community.freescale.com/message/332222#332222

Re: Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive?

jeremyzhou — Thu, 14 Aug 2014 08:27:45 GMT

Hi Robert，

Thank you very mcuh for your focus on Freescale Kinetis product. I'm glad to provide service for you.

I'm glad to learn that you had sloved your problem.

However If you have any furher questions, please feel free to contact with me.
Have a great day,
Ping

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