any reason you want to use uart1 ?
if you use uart4 you can use the whole uart tx rx and rts. trying to
bitbang rts for rs485 on uart1 sounds hard
On 4/25/2016 12:24 PM, 'Jan Kinkazu' via BeagleBoard wrote:
> So i compiled (bb-kernel, all patches) and installed 4.5.2-bone4
> I have modified am335-boneblack.dts and compiled it.
>
> #include "am335x-peripheral-ttyS1.dtsi"
> #include "am335x-bone-pinmux-ttyS1.dtsi"
>
> &am33xx_pinmux {
> uart1_pins: pinmux_uart1_pins {
> pinctrl-single,pins = <
> /* P9_23: uart1_de */
> BONE_P9_23 (PIN_OUTPUT_PULLDOWN | MUX_MODE7)
> >;
> };
> };
>
> &uart1 {
> pinctrl-names = "default";
> pinctrl-0 = <&uart1_pins>;
> status = "okay";
> rts-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
> rs485-rts-active-high;
> rs485-rx-during-tx;
> rs485-rts-delay = <1 1>;
> linux,rs485-enabled-at-boot-time;
> };
>
> RS485 doesn't work, what do I do wrong?
>
> Kind regards
>
>
> On Friday, 12 February 2016 15:33:40 UTC, Taceant Omnes wrote:
>
> I would like to use RS485 with the BBB.
>
> root@beaglebone:~/test# uname -a
> Linux beaglebone 4.1.15-ti-r40 #1 SMP PREEMPT Thu Jan 7 23:32:17 UTC
> 2016 armv7l GNU/Linux
>
> I am using the kernel above. Its source code is at
> https://github.com/RobertCNelson/linux-stable-rcn-ee/tree/4.1.15-ti-rt-r40
>
> <https://github.com/RobertCNelson/linux-stable-rcn-ee/tree/4.1.15-ti-rt-r40>
>
>
> ... however it does not include the changes in this patch:
>
> https://github.com/RobertCNelson/bb-kernel/blob/am33x-v3.8/patches/fixes/0007-omap-RS485-support-by-Michael-Musset.patch#L30
>
> <https://github.com/RobertCNelson/bb-kernel/blob/am33x-v3.8/patches/fixes/0007-omap-RS485-support-by-Michael-Musset.patch#L30>
>
>
> Which kernel should I use that includes the changes in the patch or
> something similar?
>
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