I run the QEP modules in the PWMSS subsystems. All works well, unless I try to switch the Quadrature Count mode (QDECCTL:QSRC bits). My target is to change the mode dynamically (while the module is running). This works well when I switch from Quadrature-count mode to Up-count mode.
But when I switch the other way from Up-count mode to Quadrature-count mode, the Edge Caption Unit doesn't generate UPEVNT signals at low speed for a certain time. Then, after some time (or at high speed), it starts to work as expected. The down-time at low speed varies between 5 and about 500 Unit timeout events (at random). The TRM says The QCAPCTL register should not be modified dynamically (such as switching > CAPCLK > prescaling mode from QCLK/4 to QCLK/8). The capture unit must be disabled > before > changing the prescaler. > I don't change the prescaler (CCPS bits), just the binary divider (UPPS bits). But even if I disable the Edge Caption Unit before changing its configuration and re-enabling it, it doesn't work immediately. Did anybody see this issue yet? Or solved it? If so, how? Thanks in advance! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
