That's it !, Many thanks Williams It works perfect On Thursday, December 1, 2016 at 9:28:16 PM UTC-8, William Hermans wrote: > > *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 ! >
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