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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