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OMAP3530

Other Parts Discussed in Thread: OMAP3530

Hi,

  On our custom board we are trying to generate Clock on MCBSP with 2700bps data rate. But we were unable to do it after gone through details of the clock source for MCBSP.

Can we generate the clock for that data rate (2.7KHz) with MCBSP? And please reply for any more details regarding our query to support us.

Thank You

  • Do you desire to have the internal sample rate generator be used to create the clock for 2700Hz bit clock?  Or are you supplying this desired clock in another fashion?

    You are going to need to provide some more details on what you want structured.

    Also, if the McBSP internal sample rate generator is to be used, please also provide details on the reference clock frequency to the OMAP3530 as well as how you have the PLLs configured for the clock trees inside the OMAP3530.

  • Hi BrandonAzbell,

     Thanks for the support. Sorry for the delayed reply because of our new hardware.

    Now we are generating clock on GPIO pins based on the timer tick.I'm attaching the source file.

    5518.timer_test.c

    3051.timer_app.c

    timer_test.c is the code for toggling gpio for 2700KHz

    timer_app.c is the user space application to enable timer.

    we are facing problem with clock jitter. it is varying between 2695KHZ and 2710KHZ. We are looking for exact 2700KHZ on our application.

    My clock tree is

    SystemClock = 19.2 MHz
    DPLL_MULT_VALUE = 242
     DPLL_DIV_VALUE = 13
    CORE_DPLL_CLK = 663.771 MHz
     CORE_CLK = 331.8855 MHz
    L3_CLK = 165.9427 MHz

    Can we achieve 2700KHZ with MCBSP??