[beagleboard] Re: GPIO JAVA library for Beaglebone Black
On Tue, 29 Jun 2021 07:02:06 -0700 (PDT), in gmane.comp.hardware.beagleboard.user Radovan Chovan wrote: >Thanks for all your comments. > >Is there any mapping between /sys/class/gpio and schematic diagram of >Beaglebone Black board? > Does https://vadl.github.io/beagleboneblack/2016/07/29/setting-up-bbb-gpio provide any help. >I want to use pin P9_24 (UART1_TXD) and P9_26 (UART1_RXD). >https://beagleboard.org/static/beaglebone/BEAGLEBONE_SCHEM_A3.pdf (page >11/11) > P9_24 equates to GPIO15, but in raw pin numbering appears to be 97. As I recall, there are 32 GPIOs per "CHIP", so that might be the 4th CHIP (counting from 0), and the second GPIO (again, counting from 0) >>> divmod(97, 32) (3, 1) P9_26 -> GPIO14, raw 96... >>> divmod(96, 32) (3, 0) >>> HOWEVER, debian@beaglebone:~$ gpioinfo gpiochip0 - 32 lines: line 0: "MDIO_DATA" unused input active-high line 12: "UART1_CTSN" "P9_20" input active-high [used] line 13: "UART1_RTSN" "P9_19" input active-high [used] line 14: "UART1_RXD" "P9_26" input active-high [used] line 15: "UART1_TXD" "P9_24" input active-high [used] line 16: "GMII1_TXD3" unused input active-high indicates that it is CHIP0, and the "line" 14/15 map to the GPIOxx (so for, say, GPIO45 it becomes chip 1, line 13) The gpioinfo command is provided by installing the gpiod package. debian@beaglebone:~$ /opt/source/bb.org-overlays/tools/beaglebone-universal-io/config-pin -i p9_26 Pin name: P9_26 Function if no cape loaded: gpio Function if cape loaded: default gpio gpio_pu gpio_pd gpio_input uart can i2c pru_uart pruin Function information: gpio0_14 default gpio0_14 gpio0_14 gpio0_14 gpio0_14 uart1_rxd dcan1_tx i2c1_sda pru_uart pru1_in16 Kernel GPIO id: 14 PRU GPIO id: 46 debian@beaglebone:~$ /opt/source/bb.org-overlays/tools/beaglebone-universal-io/config-pin -i p9_24 Pin name: P9_24 Function if no cape loaded: gpio Function if cape loaded: default gpio gpio_pu gpio_pd gpio_input uart can i2c pru_uart pruin Function information: gpio0_15 default gpio0_15 gpio0_15 gpio0_15 gpio0_15 uart1_txd dcan1_rx i2c1_scl pru_uart pru0_in16 Kernel GPIO id: 15 PRU GPIO id: 47 debian@beaglebone:~$ (Unfortunately, that script doesn't tell one what "default" mode IS for the pin, but does have more capability than the compiled config-pin that replaces it) -- Dennis L Bieber -- For more options, visit 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/vfamdgl62j1dvk417rb59nf514fba0o9ug%404ax.com.
Re: [beagleboard] Re: GPIO JAVA library for Beaglebone Black
At Tue, 29 Jun 2021 07:02:06 -0700 (PDT) beagleboard@googlegroups.com wrote: > > Thanks for all your comments. > > Is there any mapping between /sys/class/gpio and schematic diagram of > Beaglebone Black board? No. /sys/class/gpio just uses the GPIO numbers. The mapping of GPIO N.M is: N*32+M eg GPIO 2.05 is 69 > > I want to use pin P9_24 (UART1_TXD) and P9_26 (UART1_RXD). > https://beagleboard.org/static/beaglebone/BEAGLEBONE_SCHEM_A3.pdf (page > 11/11) If you want to use these pins as UART1, (the default), you can use /dev/ttyS1. Otherwise you should use config-pin to select the mode: For GPIO -- #0.15 for P9_24 and #0.14 for P9_26: config-pin P9_24 gpio config-pin P9_24 gpio_pu config-pin P9_24 gpio_pd config-pin P9_24 gpio_input config-pin P9_26 gpio config-pin P9_26 gpio_pu config-pin P9_26 gpio_pd config-pin P9_26 gpio_input For CAN (can1) config-pin P9_24 can config-pin P9_26 can For I2C (i2c1) config-pin P9_24 i2c config-pin P9_26 i2c > > Dátum: Å¡tvrtok 24. júna 2021, Ä as: 18:11:14 UTC+2, odosielateľ: Dennis > Bieber > > > On Thu, 24 Jun 2021 07:17:59 -0400 (EDT), in > > gmane.comp.hardware.beagleboard.user Robert Heller > > wrote: > > > > >At Thu, 24 Jun 2021 03:47:49 -0700 (PDT) beagleboard-/ > > jypxa39uh5...@public.gmane.org wrote: > > > > > >> > > >> I have complex Java application where using GPIO is only part of it. > > > > > >OK, probably the "easiest" (and Linux-only) way to add GPIO access is use > > the > > >sysfs interface. > > > > > At least until the Linux developers remove it... My understanding is > > that sysfs is currently "deprecated", the replacement being libgpiod -- a > > "character" device driver. > > > > Unfortunately, for libgpiod, JAVA probably needs an interface library > > to be created -- quick search finds > > https://github.com/mattjlewis/diozero (though there are some mentions of > > sysfs in the commentary, but perusing > > > > https://github.com/mattjlewis/diozero/blob/main/system-utils-native/src/main/c/com_diozero_internal_provider_builtin_gpio_NativeGpioDevice.c > > appears to be the libgpiod chip devices). > > > > There is also this one https://github.com/sgjava/java-periphery > > > > > > -- > > Dennis L Bieber > > > > > -- Robert Heller -- Cell: 413-658-7953 GV: 978-633-5364 Deepwoods Software-- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services hel...@deepsoft.com -- Webhosting Services -- For more options, visit 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/20210629143630.C4591220CD0%40sharky4.deepsoft.com.
Re: [beagleboard] Re: GPIO JAVA library for Beaglebone Black
On Tue, Jun 29, 2021 at 9:02 AM Radovan Chovan wrote: > > Thanks for all your comments. > > Is there any mapping between /sys/class/gpio and schematic diagram of > Beaglebone Black board? > > I want to use pin P9_24 (UART1_TXD) and P9_26 (UART1_RXD). > https://beagleboard.org/static/beaglebone/BEAGLEBONE_SCHEM_A3.pdf (page 11/11) Derek has this detail on these pdf's https://github.com/derekmolloy/boneDeviceTree/tree/master/docs https://github.com/derekmolloy/boneDeviceTree/blob/master/docs/BeagleboneBlackP9HeaderTable.pdf Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYi9moXCmnGQJgxUpJZEdgXezBSG%3DpSfZd6N%3DZ-CVyK1WA%40mail.gmail.com.
[beagleboard] Re: GPIO JAVA library for Beaglebone Black
Thanks for all your comments. Is there any mapping between /sys/class/gpio and schematic diagram of Beaglebone Black board? I want to use pin P9_24 (UART1_TXD) and P9_26 (UART1_RXD). https://beagleboard.org/static/beaglebone/BEAGLEBONE_SCHEM_A3.pdf (page 11/11) Dátum: štvrtok 24. júna 2021, čas: 18:11:14 UTC+2, odosielateľ: Dennis Bieber > On Thu, 24 Jun 2021 07:17:59 -0400 (EDT), in > gmane.comp.hardware.beagleboard.user Robert Heller > wrote: > > >At Thu, 24 Jun 2021 03:47:49 -0700 (PDT) beagleboard-/ > jypxa39uh5...@public.gmane.org wrote: > > > >> > >> I have complex Java application where using GPIO is only part of it. > > > >OK, probably the "easiest" (and Linux-only) way to add GPIO access is use > the > >sysfs interface. > > > At least until the Linux developers remove it... My understanding is > that sysfs is currently "deprecated", the replacement being libgpiod -- a > "character" device driver. > > Unfortunately, for libgpiod, JAVA probably needs an interface library > to be created -- quick search finds > https://github.com/mattjlewis/diozero (though there are some mentions of > sysfs in the commentary, but perusing > > https://github.com/mattjlewis/diozero/blob/main/system-utils-native/src/main/c/com_diozero_internal_provider_builtin_gpio_NativeGpioDevice.c > appears to be the libgpiod chip devices). > > There is also this one https://github.com/sgjava/java-periphery > > > -- > Dennis L Bieber > > -- For more options, visit 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/35d9167b-14d0-4aca-997f-769d5297330bn%40googlegroups.com.
