Adaptation for PCA9548 Nxp I2C switch
Fork of PCA9547 by
PCA9547.cpp@8:c716fb3ccb8d, 2015-04-17 (annotated)
- Committer:
- okano
- Date:
- Fri Apr 17 03:34:23 2015 +0000
- Revision:
- 8:c716fb3ccb8d
- Parent:
- 6:33ef755248e0
- Parent:
- 7:995f209b8707
re-publishing to correct revision
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
okano | 3:7e884a7805b1 | 1 | /** |
okano | 3:7e884a7805b1 | 2 | * PCA9547 library |
okano | 1:47f2cf4c6619 | 3 | * |
okano | 3:7e884a7805b1 | 4 | * @author Tedd OKANO |
okano | 6:33ef755248e0 | 5 | * @version 0.2 |
okano | 6:33ef755248e0 | 6 | * @date Feb-2015 |
okano | 3:7e884a7805b1 | 7 | * |
okano | 3:7e884a7805b1 | 8 | * PCA9547: an I2C bus multiplexer control library |
okano | 1:47f2cf4c6619 | 9 | * |
okano | 3:7e884a7805b1 | 10 | * PCA9547 is an I2C multiplexer which enables to select 1:8 multiplexed I2C bus. |
okano | 3:7e884a7805b1 | 11 | * The multiplexer is useful for deviding I2C bus to avoiding slave address conflict and separating capacitive loads. |
okano | 1:47f2cf4c6619 | 12 | * |
okano | 4:3c0af4c37587 | 13 | * For more information about PCA9547: |
okano | 3:7e884a7805b1 | 14 | * http://www.nxp.com/documents/data_sheet/PCA9547.pdf |
okano | 3:7e884a7805b1 | 15 | * |
okano | 1:47f2cf4c6619 | 16 | */ |
okano | 3:7e884a7805b1 | 17 | |
okano | 0:662ab6a5aa97 | 18 | #include "PCA9547.h" |
okano | 0:662ab6a5aa97 | 19 | |
okano | 5:f4f72501148a | 20 | PCA9547::PCA9547( PinName sda, PinName scl, char i2c_address ) |
okano | 5:f4f72501148a | 21 | : i2c_p( new I2C( sda, scl ) ), i2c( *i2c_p ), i2c_addr( i2c_address ) |
okano | 0:662ab6a5aa97 | 22 | { |
okano | 0:662ab6a5aa97 | 23 | // do nothing. |
okano | 0:662ab6a5aa97 | 24 | // leave it in default state. |
okano | 5:f4f72501148a | 25 | } |
okano | 5:f4f72501148a | 26 | |
okano | 5:f4f72501148a | 27 | PCA9547::PCA9547( I2C &i2c_, char i2c_address ) |
okano | 5:f4f72501148a | 28 | : i2c_p( NULL ), i2c( i2c_ ), i2c_addr( i2c_address ) |
okano | 0:662ab6a5aa97 | 29 | { |
okano | 0:662ab6a5aa97 | 30 | // do nothing. |
okano | 0:662ab6a5aa97 | 31 | // leave it in default state. |
okano | 0:662ab6a5aa97 | 32 | } |
okano | 0:662ab6a5aa97 | 33 | |
okano | 0:662ab6a5aa97 | 34 | PCA9547::~PCA9547() |
okano | 0:662ab6a5aa97 | 35 | { |
okano | 5:f4f72501148a | 36 | if ( NULL != i2c_p ) |
okano | 5:f4f72501148a | 37 | delete i2c_p; |
okano | 0:662ab6a5aa97 | 38 | } |
okano | 0:662ab6a5aa97 | 39 | |
okano | 0:662ab6a5aa97 | 40 | void PCA9547::select( char channel ) |
okano | 0:662ab6a5aa97 | 41 | { |
okano | 0:662ab6a5aa97 | 42 | char data = 0x08 | channel; |
okano | 0:662ab6a5aa97 | 43 | |
okano | 5:f4f72501148a | 44 | i2c.write( i2c_addr, &data, 1 ); |
okano | 0:662ab6a5aa97 | 45 | } |
okano | 2:c3459a955c8c | 46 | |
okano | 2:c3459a955c8c | 47 | void PCA9547::disable( void ) |
okano | 2:c3459a955c8c | 48 | { |
okano | 2:c3459a955c8c | 49 | char data = 0x00; |
okano | 2:c3459a955c8c | 50 | |
okano | 5:f4f72501148a | 51 | i2c.write( i2c_addr, &data, 1 ); |
okano | 2:c3459a955c8c | 52 | } |