EVM I2Croutines.c - Revision history

Cschalle: Fix spelling of category

2011-10-27T21:05:12Z

Fix spelling of category

Peter Huewe at 20:50, 27 October 2011

2011-10-27T20:50:21Z

Peter Huewe: moved I2Croutines.c to EVM I2Croutines.c: Consisten naming

2011-10-27T14:14:59Z

moved I2Croutines.c to EVM I2Croutines.c: Consisten naming

SpaceMonkey at 13:57, 22 May 2007

2007-05-22T13:57:29Z

SpaceMonkey at 13:55, 22 May 2007

2007-05-22T13:55:22Z

SpaceMonkey at 13:55, 22 May 2007

2007-05-22T13:55:02Z

New page

<block><pre>
//I2C Routines - Andrew Armstrong 2007

#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>

#define I2C_DEVICE "/dev/i2c/0"
#define I2C_SLAVE 0x0703

// Write to I2c

int i2c_read (int slaveaddr, unsigned char *buffer, int length)
{

int i2c_fd;
int red;

if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
{
printf( "Unable to open the i2c port!\n");
return 100;
}
if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
{
close( i2c_fd);
printf( "Unable to setup the i2c port!\n");
return 101;
}

red=read( i2c_fd, buffer, length);

close( i2c_fd);

return 0;
}

// Read From I2c

int i2c_write (int slaveaddr, unsigned char *buffer, int length)
{

int i2c_fd;

if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
{
printf( "Unable to open the i2c port!\n");
return 100;
}
if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
{
close( i2c_fd);
printf( "Unable to setup the i2c port!\n");
return 101;
}

write( i2c_fd, buffer, length);

waitz();

close( i2c_fd);

return 0;
}

//Write to a particular register
int i2c_write_reg (int slaveaddr, int xregister, int data)
{

int i2c_fd;
char dbuff[10];

if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
{
printf( "Unable to open the i2c port!\n");
return 100;
}
if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
{
close( i2c_fd);
printf( "Unable to setup the i2c port!\n");
return 101;
}

dbuff[0] = xregister;
dbuff[1] = data;

write( i2c_fd, dbuff, 2);

close( i2c_fd);

return 0;
}

//Read, but from a word address
int i2c_read_word (int slaveaddr, unsigned char *dregister, unsigned char *buffer, int length)
{

int i2c_fd;
int red;

if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
{
printf( "Unable to open the i2c port!\n");
return 100;
}
if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
{
close( i2c_fd);
printf( "Unable to setup the i2c port!\n");
return 101;
}

write( i2c_fd, dregister, 2);

red=read( i2c_fd, buffer, length);

close( i2c_fd);

return 0;
}

//Write, but to a word address
int i2c_write_word (int slaveaddr,unsigned char *dregister, unsigned char *buffer, int length)
{

int i2c_fd;
char output[20]; //18 byte buffer + 2 byte address
int i=0;

if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
{
printf( "Unable to open the i2c port!\n");
return 100;
}
if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
{
close( i2c_fd);
printf( "Unable to setup the i2c port!\n");
return 101;
}

output[0] = dregister[0];
output[1] = dregister[1];

for (i=2; i<length+2;i++)
{
output[i] = buffer[i-2];
}

write( i2c_fd, output, length+2);

close( i2c_fd);

return 0;
}

void main(void)
{

//blah

}

</pre></block>

@@ Line 170: / Line 170: @@
 </pre></code>
-[[Category:Davinci]]
+[[Category:DaVinci]]
 [[Category:Software]]
 [[Category:I2C]]

← Older revision		Revision as of 20:50, 27 October 2011
Line 169:		Line 169:

	</pre></code>		</pre></code>
		+
		+	[[Category:Davinci]]
		+	[[Category:Software]]
		+	[[Category:I2C]]

@@ Line 1: / Line 1: @@
-<pre>
+A bunch of various I2C routines I have had on occasion to use.
 //I2C Routines - Andrew Armstrong 2007
@@ Line 166: / Line 168: @@
+}
-</pre>
+</pre></code>

@@ Line 1: / Line 1: @@
-<block><pre>
+<pre>
 //I2C Routines - Andrew Armstrong 2007
@@ Line 166: / Line 166: @@
+}
-</pre></block>
+</pre>