Mark, I got the latest PRUCookbook downloaded and when trying to make the hello.pru0.c program in 1.6, I got this error.
*debian@beaglebone:/var/lib/cloud9/PRUCookbook/docs/02start/code$ make TARGET=hello.pru0* */var/lib/cloud9/common/Makefile:29: MODEL=TI_AM335x_BeagleBone_Black,TARGET=hello.pru0* *- Stopping PRU 0* */bin/sh: 1: cannot create /dev/remoteproc/pruss-core0/state: Directory nonexistent* *Cannot stop 0* *CC hello.pru0.c* *"/var/lib/cloud9/common/prugpio.h", line 53: warning #1181-D: #warning directive: "Found am335x"* *LD /tmp/cloud9-examples/hello.pru0.o* *- copying firmware file /tmp/cloud9-examples/hello.pru0.out to /lib/firmware/am335x-pru0-fw* *cp: cannot create regular file '/lib/firmware/am335x-pru0-fw': Permission denied* */var/lib/cloud9/common/Makefile:180: recipe for target 'install' failed* *make: *** [install] Error 1* *rm /tmp/cloud9-examples/hello.pru0.o* Initially, I did not have a folder called /var/lib/cloud9/common. To remedy this I copied the contents of /var/lib/cloud9/PRUCookbook/docs/common to /var/lib/cloud9/common. Maybe this created a problem?Nevertheless, I found some other discussions that suggested updating the scripts and kernels from beagleboard.org/upgrade which I did. I am now running... Linux beaglebone 4.14.108-ti-r137 #1stretch SMP PREEMPT Tue Aug 25 01:48:39 UTC 2020 armv7l GNU/Linux And the output of version.sh is *debian@beaglebone:/$ sudo opt/scripts/tools/version.sh* *[sudo] password for debian:* *git:/opt/scripts/:[e4e4854ef8ff9ada5c85553376043ee7679167ca]* *eeprom:[A335BNLT00C04417BBBK1847]* *model:[TI_AM335x_BeagleBone_Black]* *dogtag:[BeagleBoard.org Debian Image 2018-10-07]* *bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot SPL 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500)]:[location: dd MBR]* *bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2018.09-00002-g0b54a51eee]:[location: dd MBR]* *bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot SPL 2018.03-00002-gac9cce7c6a (Apr 05 2018 - 13:07:46 -0500)]:[location: dd MBR]* *bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.03-00002-gac9cce7c6a]:[location: dd MBR]* *UBOOT: Booted Device-Tree:[am335x-boneblack-uboot-univ.dts]* *kernel:[4.14.108-ti-r137]* *nodejs:[v6.14.4]* */boot/uEnv.txt Settings:* *uboot_overlay_options:[enable_uboot_overlays=1]* *uboot_overlay_options:[uboot_overlay_addr0=/lib/firmware/BB-W1-P9.12-00A0.dtbo]* *uboot_overlay_options:[disable_uboot_overlay_video=1]* *uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo]* *uboot_overlay_options:[enable_uboot_cape_universal=1]* *pkg check: to individually upgrade run: [sudo apt install --only-upgrade <pkg>]* *pkg:[bb-cape-overlays]:[4.4.20180928.0-0rcnee0~stretch+20180928]* *pkg:[bb-customizations]:[1.20180815-0rcnee0~stretch+20180815]* *WARNING:pkg:[bb-usb-gadgets]:[NOT_INSTALLED]* *pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517]* *pkg:[kmod]:[23-2rcnee1~stretch+20171005]* *pkg:[librobotcontrol]:[1.0.3-git20181005.0-0rcnee0~stretch+20181005]* *pkg:[firmware-ti-connectivity]:[20170823-1rcnee1~stretch+20180328]* *groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep admin spi tisdk weston-launch xenomai]* *cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet]* *dmesg | grep remote* *[ 1.147260] remoteproc remoteproc0: wkup_m3 is available* *[ 1.231303] remoteproc remoteproc0: powering up wkup_m3* *[ 1.231426] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168* *[ 1.233981] remoteproc remoteproc0: remote processor wkup_m3 is now up* *[ 108.634522] remoteproc remoteproc1: 4a334000.pru is available* *[ 108.656634] remoteproc remoteproc2: 4a338000.pru is available* *dmesg | grep pru* *[ 108.019424] pruss 4a300000.pruss: creating PRU cores and other child platform devices* *[ 108.634522] remoteproc remoteproc1: 4a334000.pru is available* *[ 108.634642] pru-rproc 4a334000.pru: PRU rproc node /ocp/pruss_soc_bus@4a326004/pruss@0/pru@34000 probed successfully* *[ 108.656634] remoteproc remoteproc2: 4a338000.pru is available* *[ 108.656808] pru-rproc 4a338000.pru: PRU rproc node /ocp/pruss_soc_bus@4a326004/pruss@0/pru@38000 probed successfully* *dmesg | grep pinctrl-single* *[ 0.783913] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568* *dmesg | grep gpio-of-helper* *[ 0.796624] gpio-of-helper ocp:cape-universal: ready* *lsusb* *Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub* *END* Any ideas? On Wednesday, February 17, 2021 at 10:10:53 AM UTC-5 Mark A. Yoder wrote: > The PRUs can give you 10's of ns timing, which is more than good enough > for milliseconds, but might be over kill. > > I'd think using C on the ARM processor should be fast enough. I'd use > gpiod[1]. > > If you really want the ns timing of the PRUs, check out the PRU Cookbook[2] > > --Mark > > [1] https://github.com/starnight/libgpiod-example > [2] https://github.com/MarkAYoder/PRUCookbook > > On Tuesday, February 16, 2021 at 10:51:11 AM UTC-5 [email protected] > wrote: > >> Depending on how precise you need to be, I would go for the PRU-ICSS. >> They can control the GPIOs pretty easily. >> >> Le mardi 16 février 2021 à 10:03:47 UTC-5, [email protected] a >> écrit : >> >>> I have a BBB Wireless running Linux beaglebone 4.14.108-ti-r106 #1 SMP >>> PREEMPT Fri May 24 22:12:34 UTC 2019 armv7l GNU/Linux >>> >>> I am writing in C. >>> >>> I turn a valve on and then need to read some sensors for N milliseconds >>> and then turn the valve off. >>> >>> What's the best way to read milliseconds on the BBBw? I don't have a >>> RTC on this particular unit but could add one using I2C. I have an >>> Adafruit 4282 with a DS3231 RTC on it on another BBBw that I could use >>> temporarily to prove it works. What other options are available? >>> >>> >>> -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/5266905e-c18b-4c43-8f38-d7ad4877f037n%40googlegroups.com.
