Output when overlay enabled but no devices found.
/sys/devices/w1_bus_master1/w1_master_add: write device
id xx-xxxxxxxxxxxx to add slave
/sys/devices/w1_bus_master1/w1_master_attempts: 61
/sys/devices/w1_bus_master1/w1_master_max_slave_count: 10
/sys/devices/w1_bus_master1/w1_master_name: w1_bus_master1
/sys/devices/w1_bus_master1/w1_master_pointer: 0xdf1eda70
/sys/devices/w1_bus_master1/w1_master_pullup: 1
/sys/devices/w1_bus_master1/w1_master_remove: write device
id xx-xxxxxxxxxxxx to remove slave
/sys/devices/w1_bus_master1/w1_master_search: -1
/sys/devices/w1_bus_master1/w1_master_slave_count: 0
/sys/devices/w1_bus_master1/w1_master_slaves: not found.
/sys/devices/w1_bus_master1/w1_master_timeout: 10
On Saturday, August 30, 2014 1:01:18 PM UTC+2, Michaël Vaes wrote:
>
> Hi -
>
> I'm stuck getting my DS18B20 temperature sensor working on my Beaglebone
> Black. I installed and loaded the DTC overlay but Im not getting the '28-*'
> files in my '/sys/devices/w1_bus_master1/' directory.
>
> *Wiring*
> https://dl.dropboxusercontent.com/u/97513059/ds18b20-temperature-sensor.pdf
>
> *Software*
> Debian 7.6
> Kernel: 3.8.13-bone50
>
> *My sensor:* http://www.mouser.com/ds/2/256/DS18B20-28978.pdf
> *My DTS file:* http://pastebin.com/ma7qd6HK
>
> *Latest version of dtc: *https://raw.githubusercontent.com/RobertCNelson/
> tools/master/pkgs/dtc <http://goog_1232883269>.sh
>
> *Install*
> root@bbb:~# cat one-wire-temp-sensor_p8-11.sh
> #!/bin/bash
> #
> # BBB One Wire Temperature sensor (DS18B20)
> #
>
> sName='w1';
> sInput=$sName'.dts';
> sOutput=${sName:0:16}'-00A0.dtbo';
>
>
> # Build
> /usr/local/bin/dtc -O dtb -o "$sOutput" -b 0 -@ "$sInput";
> cp $sOutput /lib/firmware/;
> echo "$sName" > /sys/devices/bone_capemgr.9/slots;
>
> *GPIO's*
> Pin P8.11 gets high, when I test the voltage it's 3.3VDC.
> root@bbb:~# cat /sys/kernel/debug/gpio
> GPIOs 0-31, gpio:
> gpio-6 (mmc_cd ) in lo
>
> GPIOs 32-63, gpio:
> gpio-45 (w1 ) in hi
> gpio-52 (eMMC_RSTn ) out lo
> gpio-53 (beaglebone:green:usr) out lo
> gpio-54 (beaglebone:green:usr) out lo
> gpio-55 (beaglebone:green:usr) out hi
> gpio-56 (beaglebone:green:usr) out lo
>
> GPIOs 64-95, gpio:
>
> GPIOs 96-127, gpio:
>
> *Overlays*
> HDMI disabled, w1 overlay loaded
> root@bbb:~# cat /sys/devices/bone_capemgr.9/slots
> 0: 54:PF---
> 1: 55:PF---
> 2: 56:PF---
> 3: 57:PF---
> 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
> 5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
> 6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
> 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART1
> 8: ff:P-O-L Override Board Name,00A0,Override Manuf,w1
>
> *dmesg*
> root@bbb:~# dmesg | tail -n11
> [ 167.078501] bone-capemgr bone_capemgr.9: part_number 'w1', version
> 'N/A'
> [ 167.078681] bone-capemgr bone_capemgr.9: slot #8: generic override
> [ 167.078726] bone-capemgr bone_capemgr.9: bone: Using override eeprom
> data at slot 8
> [ 167.078775] bone-capemgr bone_capemgr.9: slot #8: 'Override Board
> Name,00A0,Override Manuf,w1'
> [ 167.079020] bone-capemgr bone_capemgr.9: slot #8: Requesting part
> number/version based 'w1-00A0.dtbo
> [ 167.079067] bone-capemgr bone_capemgr.9: slot #8: Requesting firmware
> 'w1-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
> [ 167.082029] bone-capemgr bone_capemgr.9: slot #8: dtbo 'w1-00A0.dtbo'
> loaded; converting to live tree
> [ 167.082504] bone-capemgr bone_capemgr.9: slot #8: #2 overlays
> [ 167.089775] of_get_named_gpio_flags exited with status 45
> [ 167.089820] of_get_named_gpio_flags: can't parse gpios property
> [ 167.097793] bone-capemgr bone_capemgr.9: slot #8: Applied #2 overlays.
>
> *Tryouts without success*
>
> - Reboots :o)
> - Using another temperature sensor
> - Updating the OS
> - Changing the DTS file to use another pin like 'P9.22'
> -
>
> http://hipstercircuits.com/dallas-one-wire-temperature-reading-on-beaglebone-black-with-dto/
> - Changing 'gpios = <&gpio2 13 0>;' to 'gpios = <&gpio1 13 0>;'
>
> *What concerns me and where I cannot seem to get rid of in dmesg</b*
> ...
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