Tedd OKANO / PCA9547

PCA9547: an I2C bus multiplexer control library. PCA9547 is an I2C multiplexer which enables to select 1:8 multiplexed I2C bus. The multiplexer is useful for deviding I2C bus to avoiding slave address conflict and separating capacitive loads. For more information about PCA9547: http://www.nxp.com/documents/data_sheet/PCA9547.pdf

Dependents:   pca9547_Hello m3Dpi

/media/uploads/okano/pca9547_connections.png

Information

For more information, please visit component page.

The PCA9547 is an octal bidirectional translating multiplexer controlled by the I2C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels.

pca9547

PCA9547.cpp@2:c3459a955c8c, 2014-07-01 (annotated)

Committer:
okano
Date:
Tue Jul 01 00:28:17 2014 +0000
Revision:
2:c3459a955c8c
Parent:
1:47f2cf4c6619
Child:
3:7e884a7805b1
disable function added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okano 1:47f2cf4c6619 1 /* Copyright (c) 2012 cstyles, MIT License
okano 1:47f2cf4c6619 2 *
okano 1:47f2cf4c6619 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
okano 1:47f2cf4c6619 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
okano 1:47f2cf4c6619 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
okano 1:47f2cf4c6619 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
okano 1:47f2cf4c6619 7 * furnished to do so, subject to the following conditions:
okano 1:47f2cf4c6619 8 *
okano 1:47f2cf4c6619 9 * The above copyright notice and this permission notice shall be included in all copies or
okano 1:47f2cf4c6619 10 * substantial portions of the Software.
okano 1:47f2cf4c6619 11 *
okano 1:47f2cf4c6619 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
okano 1:47f2cf4c6619 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
okano 1:47f2cf4c6619 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
okano 1:47f2cf4c6619 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
okano 1:47f2cf4c6619 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
okano 1:47f2cf4c6619 17 */
okano 0:662ab6a5aa97 18 #include "PCA9547.h"
okano 0:662ab6a5aa97 19
okano 0:662ab6a5aa97 20 PCA9547::PCA9547( PinName sda, PinName scl, char i2c_address ) : i2c( sda, scl ), _i2c_addr( i2c_address )
okano 0:662ab6a5aa97 21 {
okano 0:662ab6a5aa97 22 // do nothing.
okano 0:662ab6a5aa97 23 // leave it in default state.
okano 0:662ab6a5aa97 24 }
okano 0:662ab6a5aa97 25
okano 0:662ab6a5aa97 26 PCA9547::~PCA9547()
okano 0:662ab6a5aa97 27 {
okano 0:662ab6a5aa97 28
okano 0:662ab6a5aa97 29 }
okano 0:662ab6a5aa97 30
okano 0:662ab6a5aa97 31 void PCA9547::select( char channel )
okano 0:662ab6a5aa97 32 {
okano 0:662ab6a5aa97 33 char data = 0x08 | channel;
okano 0:662ab6a5aa97 34
okano 2:c3459a955c8c 35 i2c.write( _i2c_addr, &data, 1 );
okano 0:662ab6a5aa97 36 }
okano 2:c3459a955c8c 37
okano 2:c3459a955c8c 38 void PCA9547::disable( void )
okano 2:c3459a955c8c 39 {
okano 2:c3459a955c8c 40 char data = 0x00;
okano 2:c3459a955c8c 41
okano 2:c3459a955c8c 42 i2c.write( _i2c_addr, &data, 1 );
okano 2:c3459a955c8c 43 }