Adaptation for PCA9548 Nxp I2C switch
Fork of PCA9547 by
PCA9548A.cpp@9:2fcf9622c207, 2017-03-22 (annotated)
- Committer:
- franzle
- Date:
- Wed Mar 22 09:34:59 2017 +0000
- Revision:
- 9:2fcf9622c207
- Parent:
- PCA9547.cpp@8:c716fb3ccb8d
New Library for I2C switch
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
okano | 3:7e884a7805b1 | 1 | /** |
franzle | 9:2fcf9622c207 | 2 | * PCA9548A 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 | * |
franzle | 9:2fcf9622c207 | 8 | * PCA9548A: an I2C bus multiplexer control library |
okano | 1:47f2cf4c6619 | 9 | * |
franzle | 9:2fcf9622c207 | 10 | * PCA9548A 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 | * |
franzle | 9:2fcf9622c207 | 13 | * For more information about PCA9548A: |
franzle | 9:2fcf9622c207 | 14 | * http://www.nxp.com/documents/data_sheet/PCA9548A.pdf |
okano | 3:7e884a7805b1 | 15 | * |
okano | 1:47f2cf4c6619 | 16 | */ |
okano | 3:7e884a7805b1 | 17 | |
franzle | 9:2fcf9622c207 | 18 | #include "PCA9548A.h" |
okano | 0:662ab6a5aa97 | 19 | |
franzle | 9:2fcf9622c207 | 20 | PCA9548A::PCA9548A( 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 | |
franzle | 9:2fcf9622c207 | 27 | PCA9548A::PCA9548A( 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 | |
franzle | 9:2fcf9622c207 | 34 | PCA9548A::~PCA9548A() |
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 | |
franzle | 9:2fcf9622c207 | 40 | void PCA9548A::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 | |
franzle | 9:2fcf9622c207 | 47 | void PCA9548A::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 | } |