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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. |
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| === Skills ===
| | == 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 |
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| === My ArmadeuS plans (APF28 based) ===
| | == 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 == |
| | | * [[RS-485]] for APF28/iMX28 mxs-auart and busybox stty patch |
| == RS-485 == | | * [[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. | |
| <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>.
| |
| <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
| |
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
