*1-wire workflow:* *Hardware setup:*
Everything is directly connected via jumper wires, with no additional components. DS18B20 PIN1 connected to Beaglebone P9.1 (ground) DS18B20 PIN2 connected to Beaglebone P9.22 (1-wire data) DS18B20 PIN3 connected to Beaglebone P9.5 (Vdd 5v) Remove any currently loaded overlays that might be using P9_22, then reboot. Install git if need be: william@beaglebone:~/dev$ sudo apt-get install git git clone the bb.org-overlays repo: william@beaglebone:~/dev$ git clone https://github.com/beagleboard/bb.org-overlays Move into the source directory: william@beaglebone:~/dev$ cd ./bb.org-overlays/src/arm Find the file we're looking for: william@beaglebone:~/dev/bb.org-overlays/src/arm$ ls |grep W1 BB-W1-P9.12-00A0.dts Make a copy of the file while renaming it in one go: william@beaglebone:~/dev/bb.org-overlays/src/arm$ cp BB-W1-P9.12-00A0.dts BB-W1-P9.22-00A0.dts Edit copied 1-wire overlay source to suit our needs: william@beaglebone:~/dev/bb.org-overlays/src/arm$ diff BB-W1-P9.12-00A0.dts BB-W1-P9.22-00A0.dts 4c4 < * Virtual cape for onewire on connector pin P9.12 --- > * Virtual cape for onewire on connector pin P9.22 21c21 < part-number = "BB-W1-P9.12"; --- > part-number = "BB-W1-P9.22"; 27c27 < "P9.12"; --- > "P9.22"; 35c35 < BONE_P9_12 0x37 --- > BONE_P9_22 0x37 51c51 < gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>; --- > gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>; Backout to the base path: william@beaglebone:~/dev/bb.org-overlays/src/arm$ cd ../.. Build our newly created overlay: william@beaglebone:~/dev/bb.org-overlays$ make ./src/arm/BB-W1-P9.22-00A0.dtbo "Install" our overlay: william@beaglebone:~/dev/bb.org-overlays$ sudo cp ./src/arm/BB-W1-P9.22-00A0.dtbo /lib/firmware/ Load our overlay: william@beaglebone:~/dev/bb.org-overlays$ sudo sh -c "echo 'BB-W1-P9.22' > /sys/devices/platform/bone_capemgr/slots" Check if the overlay loaded: william@beaglebone:~/dev/bb.org-overlays$ cat /sys/devices/platform/bone_capemgr/slots 0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-W1-P9.22 william@beaglebone:~/dev/bb.org-overlays$ dmesg |grep W1 [ 2826.626795] bone_capemgr bone_capemgr: part_number 'BB-W1-P9.22', version 'N/A' [ 2826.626871] bone_capemgr bone_capemgr: slot #4: 'Override Board Name,00A0,Override Manuf,BB-W1-P9.22' [ 2826.641278] bone_capemgr bone_capemgr: slot #4: dtbo 'BB-W1-P9.22-00A0.dtbo' loaded; overlay id #0 Check to make sure kernel modules loaded or not: william@beaglebone:~/dev/bb.org-overlays$ lsmod |grep w1 w1_therm 4886 0 w1_gpio 3764 0 wire 35398 2 w1_gpio,w1_therm Check sysfs: william@beaglebone:~/dev/bb.org-overlays$ ls /sys/bus/w1/devices/ 28-00000647ddf6 w1_bus_master1 Read from our sensor: william@beaglebone:~/dev/bb.org-overlays$ cat /sys/bus/w1/devices/28-00000647ddf6/w1_slave 16 01 4b 46 7f ff 0a 10 98 : crc=98 YES 16 01 4b 46 7f ff 0a 10 98 t=17375 Pat self on back for job well done ! -- 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/CALHSORo6Yn3ORAM8V4VJbN%3D%2B6ZPEddPtFfQ4BTuvvmOH20%2Bs6Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
