Hi all,
Now I could make P9_14 working as PWM, with a Python script importing
Adafruit_BBIO.PWM.
But for this to work, I need to enable the below line in uEnv.txt
cmdline=coherent_pool=1M net.ifnames=0 quiet cape_universal=enable
But enabling this line will make my other applications(including UARTs,
I2Cs) not working.
Any way to make all things working?
Thanks & Regards,
Sajeevan.K
On Thursday, July 13, 2017 at 10:06:18 AM UTC+5:30, sajeevan k wrote:
>
> Hi all,
>
> Let me make my question short.
>
> I could configure the pins P9_21 and P9_22 as PWM output using BB-PWM0
> overlay.
> But why it is not possible configure the the pins P9_14 & P9_16 and P8_13
> & P8_19 as PWM signals, by doing the same procedure with BB-PWM2 and
> BB-PWM1 overlays?
>
> Thanks & Regards,
> Sajeevan.K
>
> On Wednesday, July 12, 2017 at 5:30:15 PM UTC+5:30, sajeevan k wrote:
>>
>>
>> Hi all,
>>
>> I have already configured the pins P9_21 and P9_22 for PWM function using
>>
>> BB-PWM0 overlays.
>>
>>
>> But now I want to use these pins as UART and some other pins as PWM.
>>
>>
>> I tried to make P9_14(EHRPWM1A) & P9_16(EHRPWM1B). For this I used the
>> overlay BB-PWM1.
>>
>> A part of *BB-PWM1-00A0.dts* is shown here to confirm that BB-PWM1
>> corresponds to P9_14(EHRPWM1A) & P9_16(EHRPWM1B).
>>
>>
>>
>> fragment@0 {
>> target = <&am33xx_pinmux>;
>> __overlay__ {
>> pinctrl_spec: Panel_Pins {
>> pinctrl-single,pins = <
>> 0x48 0x06 /* (U14) gpmc_a2.ehrpwm1A */
>> 0x4c 0x06 /* (T14) gpmc_a3.ehrpwm1B */
>> >;
>> };
>> };
>> };
>>
>>
>>
>>
>> This is creating a folder pwmchip4 in /sys/class/pwm directory.
>>
>> Then with the following commands, pwm0 and pwm1 are created in
>> /sys/class/pwm/pwmchip4 directory.
>>
>>
>> sudo echo 0 > /sys/class/pwm/pwmchip4/export
>>
>> sudo echo 1 > /sys/class/pwm/pwmchip4/export
>>
>>
>>
>> And software written same as in the case of P9_21 and P9_22.
>>
>>
>> But PWM signals are not appearing in P9_14(EHRPWM1A) & P9_16(EHRPWM1B).
>>
>>
>>
>> I tried also P8_13(ehrpwm2B) & P8_19(ehrpwm2A) in the same way with
>> BB-PWM2 overlay.
>>
>> This is creating a folder pwmchip2 in /sys/class/pwm directory. These are
>> also not working.
>>
>>
>> I think I am missing something.
>>
>>
>>
>> Please help me to find out a solution.
>>
>>
>> Thanks in advance for the help.
>>
>>
>> Thanks & Regards,
>> Sajeevan.K
>>
>
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