Differences

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--- en:i2c [2014/12/21 10:12] – fluktuacia
+++ en:i2c [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 38: / Line 38: @@
 ===== Convertors to connect I²C to PC =====
-Although I²C is quite popular bus suitable to connect different sensors over short distances, it is not usually found and readily available on regular computers with exception of [[http://www.paintyourdragon.com/?p=43|DCC leading out of free display port.]]
+Although I²C is quite popular bus suitable to connect different sensors over short distances, it is not usually found and readily available on regular computers. (([[http://www.paintyourdragon.com/?p=43|with exception of DCC leading out at free display port.]]))
 ==== USB interface ====
@@ Line 53: / Line 53: @@
 ==== USB HID ====
-For connections without the need for drivers designed for specific hardware [[http://en.wikipedia.org/wiki/USB_human_interface_device_class|USB HID]] specification can be used. MLAB has only one module that complies with this particular specification - [[cs:usbi2c|USBI2C01A]]. It can be operated using python or HIDAPI - see below.
+For connections without the need for drivers designed for specific hardware [[http://en.wikipedia.org/wiki/USB_human_interface_device_class|USB HID]] specification can be used. MLAB has only one module that complies with this particular specification - [[en:usbi2c|USBI2C01A]]. It can be operated using python or HIDAPI - see below.
@@ Line 62: / Line 62: @@
 ==== Ethernet to I²C  ====
-This type of convertor can be constructed using [[cs:eth|ETH01A]] and [[cs:stm32f10xrxt|STM32F10xRxT01A]] modules and controlled by Pymlab software package (see below).
+This type of convertor can be constructed using [[en:eth|ETH01A]] and [[en:stm32f10xrxt|STM32F10xRxT01A]] modules and controlled by Pymlab software package (see below).
 ===== I²C implementation in Linux systems =====
@@ Line 88: / Line 88: @@
   i2c-6	i2c       	i2c-tiny-usb at bus 001 device 030	I2C adapter
-Using //i2cdetect// software we can further search for I²C buses for example on [[cs:odroid-x2|Odroid-X2]], which has I²C output through GPIO.
+Using //i2cdetect// software we can further search for I²C buses for example on [[en:odroid-x2|Odroid-X2]], which has I²C output through GPIO.
   kaklik@radio-arm-0:~$ sudo i2cdetect -y 1
@@ Line 102: / Line 102: @@
   kaklik@radio-arm-0:~$
-The output above shows, that apart from system device with 0x10 address, there are to additional devices connected to the bus: 0x1e ([[cs:mag|MAG01A]]) and 0x70 ([[cs:i2chub|I2CHUB02A]]).
+The output above shows, that apart from system device with 0x10 address, there are to additional devices connected to the bus: 0x1e ([[en:mag|MAG01A]]) and 0x70 ([[en:i2chub|I2CHUB02A]]).
 ==== Communication with I²C devices ====
@@ Line 127: / Line 127: @@
 Reading from I²CHub is atypical as well, because the data registry is not addressed:
-  :~$ sudo i2cget -y 1 0x70
+  $ sudo i2cget -y 1 0x70
 xff
+==== Use of Linux kernel drivers ====
+Some I²C devices have their drivers directly in the linux kernel allowing an access directly through file system. It applies to following MLAB modules:
+  * [[en:usbi2c]]
+  * [[en:i2chub]]
+  * [[en:i2cspi]]
+Due to the fact that, in principle, I²C is not a [[http://en.wikipedia.org/wiki/Plug_and_play|plug-and-play]] bus, every connected device must be explicitly reported to the kernel. A general procedure of such connection is via a following command:
+  echo driver's_name i2c_adresa > /sys/bus/i2c/devices/i2c-X/new_device
+Linux kernel will take control of I²C device - such state can be seen in i2cdetect list labeled as UU. Details concerning the initialisation can be further found in [[http://en.wikipedia.org/wiki/Dmesg|dmesg]].
 ===== Other operating systems =====
@@ Line 137: / Line 150: @@
 ===== Related sites =====
-  * [[cs:usbi2c]]
+  * [[en:usbi2c]]
-  * [[cs:i2c-pic-usb|I2C-PIC-USB]] - Konvertor I²C na USB s PIC
+  * [[en:i2c-pic-usb|I2C-PIC-USB]] - Konvertor I²C na USB s PIC
-  * [[cs:i2c_avr_usb|I2C-AVR-USB]] - Konvertor I²C na USB s AVR
+  * [[en:i2c_avr_usb|I2C-AVR-USB]] - Konvertor I²C na USB s AVR
-  * [[cs:arm|Procesory architektury ARM ve stavebnici MLAB]]
+  * [[en:arm|Procesory architektury ARM ve stavebnici MLAB]]
-  * [[cs:odroid-x2]]
+  * [[en:odroid-x2]]
-  * [[cs:friendlyarm]]
+  * [[en:friendlyarm]]
-  * [[cs:i2chub]]
+  * [[en:i2chub]]
-  * [[cs:pymlab]]
+  * [[en:pymlab]]