Hi Marcus, I was only general speaking. I just got my BBB and I'm not jet familiarwith the details of programming PWMs. But google gave me this answer:
http://www.phys-x.org/rbots/index.php ?option=com_content&view=article&id=106:lesson-3-beaglebone-black-pwm&catid =46:beaglebone-black&Itemid=81 Perhaps you can try this. 2013/10/2 Marcus Diogo <mvdiog...@gmail.com> > Hi Leonard, > > Wich drive are you using? > I try with python adafruit and did not work. > i can blink with gpio but pwm never work. > i use ubuntu precise, bbb, > > root@ubuntu-armhf:/home/ubuntu# echo 51 > /sys/class/gpio/export > root@ubuntu-armhf:/home/ubuntu# echo "out" > > /sys/class/gpio/gpio51/direction > /direction root@ubuntu-armhf:/home/ubuntu# echo "low" > > /sys/class/gpio/gpio51/direction > > but can i use the same step with pwm? > > root@ubuntu-armhf:/home/ubuntu# ls /sys/class/pwm > export pwmchip0 pwmchip2 pwmchip3 pwmchip5 pwmchip7 unexport > root@ubuntu-armhf:/home/ubuntu# ls /sys/class/pwm/pwmchip0 > base device npwm power subsystem uevent > > I try > > echo am33xx_pwm > /sys/devices/bone_capemgr.9/slots; > > echo bone_pwm_P8_19 > /sys/devices/bone_capemgr.9/slots; # EHRPWM2A > echo bone_pwm_P8_13 > /sys/devices/bone_capemgr.9/slots; # EHRPWM2B > echo bone_pwm_P9_14 > /sys/devices/bone_capemgr.9/slots; # EHRPWM1A > echo bone_pwm_P9_16 > /sys/devices/bone_capemgr.9/slots; # EHRPWM1B > > but i get. > > root@ubuntu-armhf:/home/ubuntu# ls /sys/devices/ocp.2/pwm_test_* > /sys/devices/ocp.2/pwm_test_P8_13.31: > modalias power subsystem uevent > > /sys/devices/ocp.2/pwm_test_P8_19.30: > modalias power subsystem uevent > > /sys/devices/ocp.2/pwm_test_P9_14.32: > modalias power subsystem uevent > > /sys/devices/ocp.2/pwm_test_P9_16.33: > modalias power subsystem uevent > > > > > > > > 2013/10/2 Tux Leonard <tuxl...@gmail.com> > >> You can use a PWM output to drive your servo. Set the PWM cycle frequency >> to 50hz and the duty cycle to 1.5 ms (~7% = center position). Varying the >> duty cycle +/- 0.5ms should drive your servo to left and right. >> Power the servo by an external power source not the GPIOs of the board. >> Am 02.10.2013 15:43 schrieb "서재필" <sjp890...@gmail.com>: >> >> Hello, BB group~ >>> >>> I'm figuring out how to control Servo motor by angle information with my >>> BB. >>> >>> I made a tracking sound c++ code and this code get some angle(degree) >>> information. And finally i got it with my BB. >>> >>> The next step is controlling Servo motor by this angle information. >>> >>> So I'm thinking of 2 methods. >>> >>> First one is using Arduino(send angle information to Arduino from BB), >>> and Second one is BB directly controls a Servo motor. >>> >>> But I don't know how to use gpio in BB and I wonder 2 methods I >>> thought are possible to implement coding by just using c++ in Angstrom >>> linux. >>> >>> Please give me any comments. >>> >>> It will be great help for me. >>> >>> Thanks. >>> >>> >>> >>> -- >>> 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 beagleboard+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> -- >> 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 beagleboard+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > > -- > Marcus de Vasconcelos Diogo da Silva > > "Uma montanha até um cego consegue desviar,mas é nas pedras menores que > nós muitas vezes tropeçamos e caimos!" > > -- > 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 beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
