https://github.com/USU-Robosub/Poseidon/tree/remote-control/kernel/drivers/PWM
On Sunday, December 20, 2015, Daniel <[email protected]> wrote: > Dear TekuConcept， > > Could you please share your kernel module that enable Time Based Clocks of > PWMSS? > Thanks. > > 在 2015年4月16日星期四 UTC+8下午9:29:59，TekuConcept写道： >> >> >> - config-pin [pin] [state] will mux the pins to the PWM Subsystems >> - Modifying am33xx.dtsi under the dtb-rebuilder project such that: >> epwmss0, epwmss1, and epwmss2 status = "okay", and their children, >> ehrpwm0, >> ehrpwm1, and erhpwm2 status = "okay", will enable the system clocks for >> each subsystem. This equivalent to setting the following registers to the >> given values in their respective order: >> >> reg[0x44E00000] = 0x0 *# CM_PER_L4L3_CLKSTCTRL.CLKTRCTRL = NO_SLEEP* >> reg[0x44E000D4] = 0x2* # CM_PER_EPWMSS0_CLKCTRL.MODULEMODE = ENABLE* >> reg[0x44E000CC] = 0x2 *# CM_PER_EPWMSS1_CLKCTRL.MODULEMODE = ENABLE* >> reg[0x44E000D8] = 0x2* # CM_PER_EPWMSS2_CLKCTRL.MODULEMODE = ENABLE* >> >> - However, after all this, the PWM subsystems will still not work >> because the Time Based Clocks are not enabled. To enable them, one would >> need kernel elevated privileges: such as modifying the register through a >> simple kernel module. >> >> reg[0x44E10664] = 0x7 # CONTROL_MODULE.pwmss_ctrl = pwmss0_tbclken | >> (pwmss1_tbclken << 1) | (pwmss2_tbclken << 2) >> >> Using a simple kernel module I built for hardware debugging, I was able >> to confirmed this. (Look at ioremap & iounmap under kernel module >> development) >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/KMIXJPa4IQI/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected] > <javascript:_e(%7B%7D,'cvml','beagleboard%[email protected]');> > . > For more options, visit https://groups.google.com/d/optout. > -- 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.
