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F2808 Clock

Ramol Bosh
Prodigy 90 points
Other Parts Discussed in Thread: TMS320F2808

Hi all, I am new to TMS320F2808. I am having a problem with the output frequency of a simple waveform. I have created a square out of a simple logic using a sinewave. The frequency of the squarewave is only 220Hz. When I tried to increase the frequency using the IQMath library function the frequency changed to 780Hz. The question is F2808 operates at 10MHz, but why am I getting such low frequency output. Please help me. Thank you.

  • 0
    Prodigy 90 points

    I found the problem, but I do not have a solution for this. The problem is that, when I checked the clock frequency using the "On-Chip Flash Programmer" with "Frequency Test" option it is giving an output of 10kHz out of the configured GPIO pin. This value should be 100MHz which we will set as the system clock in the flash settings. Please help me with this. Thank you.

  • 0 in reply to Ramol Bosh
    Intellectual 260 points

    Read again the manual to sdflash.

    It states:

    User Options 2: Toggle Test pin select.  The toggle test toggles a selected pin
    at a known frequency in order to confirm proper configuration of the flash
    programming algorithms.  While the test runs, monitor the selected pin using an
    oscilloscope.  If the algorithms are configured correctly for your CPU rate then
    the pin will toggle near 10kHz (100µS +/- 10µS cycle time).  If the pin is toggling
    at a different rate, then the algorithms are not configured correctly.

    So there is everything all right with toggle test on your cpu.