EMAC I²C Programming - Revision history

Bserrano at 19:55, 14 April 2014

2014-04-14T19:55:09Z

2014-03-26T22:03:47Z

2014-03-26T21:56:34Z

2014-03-04T22:26:54Z

2013-12-30T21:02:01Z

Fixed formatting and grammar. Complete.

2013-12-27T01:07:41Z

2013-12-26T20:51:07Z

2013-12-26T20:07:20Z

2013-12-26T20:04:49Z

2013-12-19T01:11:27Z

‎Accessing the i2c-dev Interface

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-{{todo|SEOKWREV; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+);(03.04.14-16:25->BS-);(03.26.14-16:55->BS+)|Michael Welling|project=oe 4,oe 5,mw,md,mg,bs,SEOKWREV}}
+{{todo|SEOKWREV; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+);(03.04.14-16:25->BS-);(03.26.14-16:55->BS+);(04.14.14-14:55->BS+)|Michael Welling|project=oe 4,oe 5,mw,md,mg,bs,SEOKWREV}}
 {{#seo:
 |title=EMAC I²C Programming
 |titlemode=append
-|keywords=EMAC,I²C Programming,Accessing the i2c-dev Interface,Simple C Code Example
+|keywords=I²C Programming,i2c-dev Interface
 |description=Programming I²C device.
 }}

@@ Line 5: / Line 5: @@
 |titlemode=append
 |keywords=EMAC,I²C Programming,Accessing the i2c-dev Interface,Simple C Code Example
-|description=Your meta description
+|description=Programming I²C device.
 }}
 === Background Information ===

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-{{todo|SEOKWTODO; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+);(03.04.14-16:25->BS-)|Brian Serrano|project=oe 4,oe 5,mw,md,mg,bs,SEOKWTODO}}
+{{todo|SEOKWREV; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+);(03.04.14-16:25->BS-);(03.26.14-16:55->BS+)|Michael Welling|project=oe 4,oe 5,mw,md,mg,bs,SEOKWREV}}
 === Background Information ===
 I²C is a low-speed (400 kHz max.) two wire serial interface used to connect to a variety of sensor and I/O devices. The interface uses two bi-directional open-drain I/Os, SDA and SCL, to communicate to devices based on an address encoded within the data transmission. SDA is a data signal which sends and receives serially transmitted data. SCL is a clock signal which is used to determine when to latch data from the SDA line.

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-{{todo|Complete; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+)|Michael Welling|project=oe 4,oe 5,mw,md,mg,Complete}}
+{{todo|SEOKWTODO; (12.4.13-15:35->MD+);(12.26.13-14:05->MW+);(12.26.13-14:50->MG+);(03.04.14-16:25->BS-)|Brian Serrano|project=oe 4,oe 5,mw,md,mg,bs,SEOKWTODO}}
 === Background Information ===
 I²C is a low-speed (400 kHz max.) two wire serial interface used to connect to a variety of sensor and I/O devices. The interface uses two bi-directional open-drain I/Os, SDA and SCL, to communicate to devices based on an address encoded within the data transmission. SDA is a data signal which sends and receives serially transmitted data. SCL is a clock signal which is used to determine when to latch data from the SDA line.

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 === Accessing the i2c-dev Interface ===
-When the i2c-dev driver is properly loaded it exposes a device interface for each available I²C interface. Each interface will have an associated character device node at /dev/i2c-X, where X is replaced by a number representing the interface. This device node allows the user to access the I²C interface directly from a C program.
+When the i2c-dev driver is properly loaded it exposes a device interface for each available I²C interface. Each interface will have an associated character device node at <code>/dev/i2c-X</code>, where X is replaced by a number representing the interface. This device node allows the user to access the I²C interface directly from a C program.
-To open a I²C device node from a C program, use the standard <code>open</code> command as follows:
+To open an I²C device node from a C program, use the standard <code>open</code> command as follows:
 <syntaxhighlight lang="c">
 int fd;
@@ Line 23: / Line 23: @@
-Once the device is open, the I2C_SLAVE ioctl command is used to set the address of the slave I²C device:
+Once the device is open, the <code>I2C_SLAVE ioctl</code> command is used to set the address of the slave I²C device:
 <syntaxhighlight lang="c">

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 <syntaxhighlight lang="c">
 int ret;
 int addr = 0x0e;

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 === Accessing the i2c-dev Interface ===
 When the i2c-dev driver is properly loaded it exposes a device interface for each available I²C interface. Each interface will have an associated character device node at /dev/i2c-X, where X is replaced by a number representing the interface. This device node allows the user to access the I²C interface directly from a C program.
 <syntaxhighlight lang="c">
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      exit(0);
+}
 </syntaxhighlight>

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 <syntaxhighlight lang="c">
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include "i2c-dev.h"