Difference between revisions of "User:JanosA"

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My hobby is programming embedded systems and creating my own small electronic boards.
 
My hobby is programming embedded systems and creating my own small electronic boards.
  
=== Skills ===
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== Skills ==
 
* Assembly programming: PIC 8bit family
 
* Assembly programming: PIC 8bit family
 
* C programming: PIC 8bit / PIC32MX family, Linux
 
* C programming: PIC 8bit / PIC32MX family, Linux
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* IP networking
 
* IP networking
  
=== My ArmadeuS plans (APF28 based) ===
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== My ArmadeuS plans (APF28 based) ==
 
* Creating an universal home automation hardware for my friends, with easy programming in perl or PHP. :)
 
* Creating an universal home automation hardware for my friends, with easy programming in perl or PHP. :)
 
* Datacenter temperature monitoring, with RS-485 and OneWire communications.
 
* Datacenter temperature monitoring, with RS-485 and OneWire communications.
 
* Data logger for Saia Sbus based intelligent power meters.
 
* Data logger for Saia Sbus based intelligent power meters.
  
 
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== My works comitted to ArmadeuS project ==
 
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* [[RS-485]] for APF28/iMX28 mxs-auart and busybox stty patch
== RS-485 ==
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* [[OneWire GPIO bus Master]] for APF28DEV
Informations and mini HOWTOs for my APF28/iMX28 mxs-auart and busybox stty patches moved to the main Wiki tree: [[RS-485]]
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== OneWire ==
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Informations and mini HOWTOs for my APF28DEV OneWire patch.
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=== Software installation ===
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* Recompile your Linux kernel with OneWire GPIO bus master (and some slave device) support.
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<pre class="host">
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$ make linux-menuconfig
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</pre>
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<pre class="config">
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Device Drivers  --->
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    <*> Dallas's 1-wire support  --->
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        1-wire Bus Masters  --->
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            <*> GPIO 1-wire busmaster
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        1-wire Slaves  --->
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            <*> Thermal family implementation
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</pre>
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<pre class="host">
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$ make
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</pre>
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* Reflash your Linux kernel
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=== Hardware Notes ===
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* Connect the OneWire slave directly to the APF28_DEV board J9 connector:
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  * Vcc 3.3V is pin 1 on J9 connector
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  * DQ is pin 31 on J9 (LCD_D18 / GPIO 1_18)
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  * GND is pin 39 on J9
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* Add an 1.2k pullup resistor between Vcc and DQ
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=== How it works ===
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The OneWire bus master driver every 10 seconds scan the bus for new slave devices.
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Each detected OneWire slave device have a sub-directory with it's unique ID in "/sys/devices/w1 bus master".
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The sub-directory format is <2 digit family ID>-<12 digit unique ID>.
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<pre class=apf>
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# ls -la /sys/devices/w1\ bus\ master/
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total 0
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drwxr-xr-x    4 root    root            0 Jan  1 01:06 .
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drwxr-xr-x    6 root    root            0 Jan  1 01:05 ..
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drwxr-xr-x    3 root    root            0 Jan  1 01:06 28-000001e68904
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lrwxrwxrwx    1 root    root            0 Jan  1 01:07 driver -> ../../bus/w1/drivers/w1_master_driver
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drwxr-xr-x    2 root    root            0 Jan  1 01:07 power
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lrwxrwxrwx    1 root    root            0 Jan  1 01:07 subsystem -> ../../bus/w1
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-rw-r--r--    1 root    root          4096 Jan  1 01:07 uevent
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-rw-rw-rw-    1 root    root          4096 Jan  1 01:07 w1_master_add
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_attempts
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_max_slave_count
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_name
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_pointer
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-rw-rw-rw-    1 root    root          4096 Jan  1 01:07 w1_master_pullup
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-rw-rw-rw-    1 root    root          4096 Jan  1 01:07 w1_master_remove
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-rw-rw-rw-    1 root    root          4096 Jan  1 01:07 w1_master_search
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_slave_count
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_slaves
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-r--r--r--    1 root    root          4096 Jan  1 01:07 w1_master_timeout
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</pre>
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You can list the detected slaves from this files:
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<pre class=apf>
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# cat /sys/devices/w1\ bus\ master/w1_master_slave_count
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1
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# cat /sys/devices/w1\ bus\ master/w1_master_slaves
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28-000001e68904
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</pre>
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Let's read the temperature: (The 28-xxx family is a DS18B20 temperature sensor in this example.)
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<pre class=apf>
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# cat /sys/devices/w1\ bus\ master/28-000001e68904/w1_slave
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dd 01 4b 46 7f ff 03 10 1e : crc=1e YES
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dd 01 4b 46 7f ff 03 10 1e t=29812
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</pre>
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The t=29812 means, the temperature is: 29.812°C
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Latest revision as of 14:39, 19 May 2013

About Me

I am IP Network and Datacenter engineer, currently I'm working for an Internet Service Provider in Hungary.

My hobby is programming embedded systems and creating my own small electronic boards.

Skills

  • Assembly programming: PIC 8bit family
  • C programming: PIC 8bit / PIC32MX family, Linux
  • Perl, PHP, Javascript, Html programming with MySQL
  • Linux system administration
  • RS-232/485 serial communications: Ascii, Modbus, Saia Sbus, etc.
  • IP networking

My ArmadeuS plans (APF28 based)

  • Creating an universal home automation hardware for my friends, with easy programming in perl or PHP. :)
  • Datacenter temperature monitoring, with RS-485 and OneWire communications.
  • Data logger for Saia Sbus based intelligent power meters.

My works comitted to ArmadeuS project