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what can cause CyU3PUsbStart() to hang? | Cypress Semiconductor

what can cause CyU3PUsbStart() to hang?

Summary: 0 Replies, Latest post by akohlsmith on 06 Dec 2013 02:55 PM PST
Verified Answers: 0
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user_193124556's picture
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I have a bootloader in I2C which loads the main application image from I2C into RAM and calls CyFx3BootJumpToProgramEntry() to start the main application.  This works fine, but I have discovered that the main application hangs in CyU3PUsbStart().


My bootloader does not call any of the boot API USB functions, but it does use the UART.  When I am loading the application from the EEPROM into RAM I am following the recommended procedure for using a bounce buffer for ITCM accesses.


If I load the main application directly into RAM from the ROM bootloader (i.e. not using my I2C bootloader code) then it works fine and connects to USB every time. I'm at a loss to explain what could be going wrong to cause CyU3PUsbStart() to hang.



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