topic Re: Porting USB Stack example projects to CrossWorks in Kinetis Microcontrollers

Porting USB Stack example projects to CrossWorks

gaminn — Wed, 13 Mar 2013 19:29:26 GMT

Hello,

is there any information how to port existing projects in Freescale USB Stack 4.0.3 to Rowley CrossWorks for ARM? For example this project: Freescale USB Stack v4.0.3\Source\Device\app\hid\cw10\kinetis_k70 . I can build it in CrossStudio, however the enumeration fails. I did no modification to the original code, only startup code differs.

MCU clock is OK (120 MHz), ISRs are working.

Thanks

Re: Porting USB Stack example projects to CrossWorks

gaminn — Thu, 14 Mar 2013 12:10:30 GMT

We finally did it – the whole magic is that „LITTLE_ENDIAN“ symbol wasn’t defined for CrossStudio project. Codewarrior has it.

Re: Porting USB Stack example projects to CrossWorks

chuckh — Tue, 13 Aug 2013 20:53:51 GMT

I'm having similar issues porting to Atollic IDE. The LITTLE_ENDIAN was an issue, but I'm still having problems. I'm getting a USB error PIDERR. Any thoughts?

Re: Porting USB Stack example projects to CrossWorks

chuckh — Tue, 13 Aug 2013 21:59:55 GMT

Figured it out...it was a PLL thing plus the LITTLE_ENDIAN.

Re: Porting USB Stack example projects to CrossWorks

HagaiCohen — Sun, 22 Sep 2013 06:05:31 GMT

Hi,

Sorry for reviving this old thread but i have the same issue while writing my own stack,

when connecting USB, i get ERR Interrupt, ERRSTAT is 1 (PIDERR)

this is the only thread i found about this issue.

Currently i'm compiling the code with arm-none-eabi- toolchain, all i have to do is add #define LITTLE_ENDIAN ?

or how do i set this little-endian mentioned?

EDIT:

I tried both #define LITTLE_ENDIAN in the .c file

and -mlittle-endian in the gcc command line, no help.

also, there is a PLL mentioned, im pretty sure i'm using the right PLL, because reset interrupt is working, but what pll should be used?

Re: Porting USB Stack example projects to CrossWorks

chuckh — Mon, 23 Sep 2013 16:29:24 GMT

I added the define to my project settings. The PLL was because of how the clocks are configured. Make sure that the USB is getting a 48MHZ clock one way or another. It doesn't necessarily have to be the PLL, but it does have to be 48MHZ. I'm no expert, but I know that once I looked into how the clocks worked, I was able to also get it working without the PLL.