CAN bootloader question

Ronnie

I use 2806x and 2803x CAN communication to update product application software, the total software includes boot program and application program, after power on, boot program is excuted first, and then jumps to application program. Both boot program and application program have CAN initialization.

But if I connect DSP with XDS100V2 emulator, after the program jumps to application program, it enters the following while loop in CAN initialization part.

// Wait until the CPU has been granted permission to change the configuration registers
  do
  {
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
  } while(ECanaShadow.CANES.bit.CCE != 1 );    // Wait for CCE bit to be set..

And if 2803x or 2806x DSP is not powered by XDS100V2 emulator but Switching Mode Power Supply in circuit board, everything goes where, That's why ? How to deal with it ?

over 7 years ago

0 Christopher Chiarella over 7 years ago

TI__Mastermind 30255 points

Hello

All you change is the power supply? As per the definition of the CCE bit, once it gets cleared, CANRX pin must be sensed high before you can set CCE bit to 1 again. Try checking your CANRX pin and make sure it is high in your failing senario.

Best regards
Chris

0 Ronnie over 7 years ago in reply to Christopher Chiarella

Intellectual 750 points

As per the definition of the CCE bit, once it gets cleared, CANRX pin must be sensed high before you can set CCE bit to 1 again.

But the CCE bit is read only, does it change to 1 automatically？

0 Christopher Chiarella over 7 years ago in reply to Ronnie

TI__Mastermind 30255 points

Yes, the IP will change it. The CPU must write to CANMC.CCR to request access to the configuration registers and then wait for CCE to change.

Best regards
Chris

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CAN bootloader question