It is easy and already disabled. My question is about RS485 and custom gpio to drive DE pin of RS485 chip.
2016-04-25 23:22 GMT+01:00 evilwulfie <[email protected]>: > read this. disabling I2C2 is not as easy as using an overlay > if you are not using capes sure but IMHO is always best to leave the > default things enabled and just work with overlays > > http://www.embedded-things.com/bbb/enable-canbus-on-the-beaglebone-black/ > > > > > > On 4/25/2016 2:09 PM, 'Artur Festyn' via BeagleBoard wrote: > > Honestly I don't know. I though this might be useful info :) > Three is no problem to disable I2C-2, but I am using those pins for CAN0. > That is why I want to use custom gpio to drive RS485 DE which doesn't work. > > 2016-04-25 21:56 GMT+01:00 William Hermans <[email protected]>: > >> *cat /proc/tty/driver/serial* >> >> *serinfo:1.0 driver revision:* >> *0: uart:8250 mmio:0x44E09000 irq:158 tx:2451 rx:0 RTS|CTS|DTR|DSR* >> *1: uart:8250 mmio:0x48022000 irq:159 tx:24 rx:0 CTS|DSR|CD|RI* >> *2: uart:8250 mmio:0x48024000 irq:160 tx:0 rx:0 CTS|DSR* >> *3: uart:unknown port:00000000 irq:0* >> *4: uart:8250 mmio:0x481A8000 irq:161 tx:2 rx:1 brk:1 CTS|DSR* >> >> *5: uart:unknown port:00000000 irq:0* >> >> What is this supposed to mean ? That says UART0 has RTS, CTS, etc, but >> they're not connected to anything. So the CTS on UART1 means nothing. >> Because it's connected to I2C-2, which I'm sure you would have all kinds of >> fun disabling I2C-2 . . . >> >> >> On Mon, Apr 25, 2016 at 1:14 PM, 'Artur Festyn' via BeagleBoard < >> <[email protected]>[email protected]> wrote: >> >>> cat /proc/tty/driver/serial >>> serinfo:1.0 driver revision: >>> 0: uart:8250 mmio:0x44E09000 irq:158 tx:2451 rx:0 RTS|CTS|DTR|DSR >>> *1: uart:8250 mmio:0x48022000 irq:159 tx:24 rx:0 CTS|DSR|CD|RI* >>> 2: uart:8250 mmio:0x48024000 irq:160 tx:0 rx:0 CTS|DSR >>> 3: uart:unknown port:00000000 irq:0 >>> 4: uart:8250 mmio:0x481A8000 irq:161 tx:2 rx:1 brk:1 CTS|DSR >>> 5: uart:unknown port:00000000 irq:0 >>> >>> >>> 2016-04-25 21:12 GMT+01:00 Artur Festyn < <[email protected]> >>> [email protected]>: >>> >>>> I can't use RTS/CTS pins on UART4 because I need HDMI. >>>> New RS485 patches suppose to help to use any gpio as RS485 RTS and in >>>> fact any gpio for any UART as RTS/CTS. >>>> >>>> >>>> >>>> >>>> 2016-04-25 21:00 GMT+01:00 evilwulfie < <[email protected]> >>>> [email protected]>: >>>> >>>>> 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? >>>>>> >>>>> -- >>>>> For more options, visit <http://beagleboard.org/discuss> >>>>> 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 <[email protected]> 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