>From hardware you could use a 74HC04 to invert the signal. No need for an
additional enable line.
Cheers.
On Tue, Nov 25, 2014 at 1:27 PM, ja...@bigpond.net.au <ja...@bigpond.net.au>
wrote:
>
> Thanks Peter,
>
> I have exercised that option already before posting and somehow it didn't
> work.
>
> Changing the parameters (and recompiling) didn't change the default
> values, so my conclusion is that they might be
>
> somehow hard-coded in a kernel driver.
>
> Jan
> ------------------------------
> On 26/11/2014 12:34 AM Peter Gregory wrote:
>
> I don't know if this will help, but have you tried changing the polarity
> of the PWM pin in the device tree overlay?
>
> bs_pwm_test_P8_13 {
> compatible = "pwm_test";
> pwms = <&ehrpwm2 1 500000 0>;
> pwm-names = "PWM_P8_13";
>
> pinctrl-names = "default";
> pinctrl-0 = <&bs_pwm_P8_13_0xc>;
>
> enabled = <1>;
> duty = <0>;
> status = "okay";
> };
>
>
> The last numeric parameter of pwms <&ehrpwm2 1 500000 0> swaps the
> polarity of the PWM output.
> With the default duty cycle of 0, the pin will be low on power-up.
>
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