LPC1768: Change main clock from 12MHz to 16MHz

marcwetzel — Wed, 21 Feb 2018 19:04:52 GMT

Hi,

I have a self-made board with a LPC1768 @ 16 MHz and CAN here.

I started the project by using the provided LPC1769 (LPCOpen) examples.

I changed the XTal frequency (named OscRateIn) in board.c in the example code from 12MHz to 16MHz.

While testing with the CAN example inside I get the more transmission errors the higher the CAN Baudrate goes.

At 500kbit it is not usable at all.

It seems that changing only the OscRateIn is not all that I have to change.

Is there some way to fix this in software, or do I better use the example default osc frequency of 12 MHz

BR
Marc

Re: LPC1768: Change main clock from 12MHz to 16MHz

kerryzhou — Fri, 23 Feb 2018 07:39:38 GMT

Hi Marc Wetzel,

After you modify the board.c, do you build the lpc_board_nxp_lpcpresso_1769 at first, then build the periph_can?

If the lib file is modified, it need to build it at first.

After you build the lib and the periph project, then debug your board, the function Chip_CAN_SetBitRate.

Tell me the CANPclk , TSEG1, TSEG2 and BRP, I will calculate it.

Have a great day,
Kerry

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

topic Re: LPC1768: Change main clock from 12MHz to 16MHz in LPC Microcontrollers

LPC1768: Change main clock from 12MHz to 16MHz

Re: LPC1768: Change main clock from 12MHz to 16MHz