McBsp PSP driver CLK edge bug

Hi Jeremiah Ferguson,

First of all, yes this is the bug in the McBSP driver while configuring to receive data (it is fine with the transmit). This can be eliminated in two ways,

1. you can use the IOCTL "Mcbsp_IOCTL_SET_BCLK_POL" with appropriate argument ie either "Mcbsp_ClkPol_FALLING_EDGE" or "Mcbsp_ClkPol_RISING_EDGE".

2. In the function Mcbsp_localConfigureRcvChannel() in the file Mcbsp.c,

    replace,

    if (Mcbsp_ClkPol_RISING_EDGE == params->clkSetup->clkPolarity)
    {
        /* clock data sampled on rising edge                                  */
        instHandle->hwInfo.regs->PCR &= (~CSL_MCBSP_PCR_CLKRP_MASK);
    }
    else
    {
        /* clock data sampled on falling edge                                 */
        instHandle->hwInfo.regs->PCR |= (CSL_MCBSP_PCR_CLKRP_MASK);
    }

    with

    if (Mcbsp_ClkPol_RISING_EDGE == params->clkSetup->clkPolarity)
    {
        /* clock data sampled on rising edge                                  */
        instHandle->hwInfo.regs->PCR I= CSL_MCBSP_PCR_CLKRP_MASK;
    }
    else
    {
        /* clock data sampled on falling edge                                 */
        instHandle->hwInfo.regs->PCR &= (~CSL_MCBSP_PCR_CLKRP_MASK);
    }
 

    The driver needs to be compiled after this modification.

Please let me know the result, so that i can raise an IR (defect management) and can be fixed in the future release.

Thanks and Regards,

Sandeep K