ArS / PCA9548A

Adaptation for PCA9548 Nxp I2C switch

Fork of PCA9547 by Tedd OKANO

PCA9548A.h@9:2fcf9622c207, 2017-03-22 (annotated)

Committer:
franzle
Date:
Wed Mar 22 09:34:59 2017 +0000
Revision:
9:2fcf9622c207
Parent:
PCA9547.h@6:33ef755248e0 
New Library for I2C switch

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okano 1:47f2cf4c6619 1 /**
franzle 9:2fcf9622c207 2 * PCA9548A library
okano 1:47f2cf4c6619 3 *
okano 1:47f2cf4c6619 4 * @author Tedd OKANO
okano 6:33ef755248e0 5 * @version 0.2
okano 6:33ef755248e0 6 * @date Feb-2015
okano 1:47f2cf4c6619 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 1:47f2cf4c6619 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 1:47f2cf4c6619 15 *
okano 1:47f2cf4c6619 16 */
okano 1:47f2cf4c6619 17
okano 0:662ab6a5aa97 18 #ifndef MBED_PCA9547_H
okano 0:662ab6a5aa97 19 #define MBED_PCA9547_H
okano 0:662ab6a5aa97 20
okano 0:662ab6a5aa97 21 #include "mbed.h"
okano 0:662ab6a5aa97 22
franzle 9:2fcf9622c207 23 /** PCA9548A class
okano 1:47f2cf4c6619 24 *
franzle 9:2fcf9622c207 25 * PCA9548A: an I2C bus multiplexer control library
okano 1:47f2cf4c6619 26 *
franzle 9:2fcf9622c207 27 * PCA9548A is an I2C multiplexer which enables to select 1:8 multiplexed I2C bus.
okano 1:47f2cf4c6619 28 * The multiplexer is useful for deviding I2C bus to avoiding slave address conflict and separating capacitive loads.
okano 1:47f2cf4c6619 29 *
franzle 9:2fcf9622c207 30 * For more informatioj about PCA9548A:
franzle 9:2fcf9622c207 31 * http://www.nxp.com/documents/data_sheet/PCA9548A.pdf
okano 1:47f2cf4c6619 32 *
okano 1:47f2cf4c6619 33 * Example:
okano 1:47f2cf4c6619 34 * @code
okano 1:47f2cf4c6619 35 * #include "mbed.h"
okano 1:47f2cf4c6619 36 * #include "LM75B.h"
franzle 9:2fcf9622c207 37 * #include "PCA9548A.h"
okano 1:47f2cf4c6619 38 *
franzle 9:2fcf9622c207 39 * PCA9548A mux( p28, p27, 0xE0 );
okano 5:f4f72501148a 40 *
okano 1:47f2cf4c6619 41 * int main()
okano 1:47f2cf4c6619 42 * {
okano 1:47f2cf4c6619 43 * mux.select( 0 );
okano 1:47f2cf4c6619 44 *
okano 1:47f2cf4c6619 45 * LM75B tmp0( p28, p27 ); // making instance after a branch of I2C bus (which is connecting the LM75B) enabled
okano 1:47f2cf4c6619 46 *
okano 1:47f2cf4c6619 47 * while(1) {
okano 1:47f2cf4c6619 48 * printf( "%.3f\r\n", tmp0.read() );
okano 1:47f2cf4c6619 49 * wait( 1.0 );
okano 1:47f2cf4c6619 50 * }
okano 1:47f2cf4c6619 51 * }
okano 1:47f2cf4c6619 52 * @endcode
okano 1:47f2cf4c6619 53 */
okano 1:47f2cf4c6619 54
franzle 9:2fcf9622c207 55 class PCA9548A
okano 0:662ab6a5aa97 56 {
okano 0:662ab6a5aa97 57 public:
okano 1:47f2cf4c6619 58
franzle 9:2fcf9622c207 59 /** Create a PCA9548A instance connected to specified I2C pins with specified address
okano 1:47f2cf4c6619 60 *
okano 1:47f2cf4c6619 61 * @param sda I2C-bus SDA pin
okano 1:47f2cf4c6619 62 * @param scl I2C-bus SCL pin
okano 1:47f2cf4c6619 63 * @param i2c_address I2C-bus address (default: 0xE0)
okano 1:47f2cf4c6619 64 */
franzle 9:2fcf9622c207 65 PCA9548A( PinName sda, PinName scl, char i2c_address = 0xE0 );
okano 0:662ab6a5aa97 66
okano 5:f4f72501148a 67 /** Create a PCA9546A instance connected to specified I2C pins with specified address
okano 5:f4f72501148a 68 *
okano 5:f4f72501148a 69 * @param &i2c_ I2C object (instance)
okano 5:f4f72501148a 70 * @param i2c_address I2C-bus address (default: 0xE0)
okano 5:f4f72501148a 71 */
franzle 9:2fcf9622c207 72 PCA9548A( I2C &i2c_, char i2c_address = 0xE0 );
okano 5:f4f72501148a 73
franzle 9:2fcf9622c207 74 /** Destructor of PCA9548A
okano 1:47f2cf4c6619 75 */
franzle 9:2fcf9622c207 76 ~PCA9548A();
okano 0:662ab6a5aa97 77
okano 1:47f2cf4c6619 78 /** Channel select
okano 1:47f2cf4c6619 79 *
okano 2:c3459a955c8c 80 * Enable and select a channel
okano 1:47f2cf4c6619 81 *
okano 1:47f2cf4c6619 82 * @param channel channel number
okano 1:47f2cf4c6619 83 */
okano 0:662ab6a5aa97 84 void select( char channel );
okano 0:662ab6a5aa97 85
okano 2:c3459a955c8c 86 /** Disabling all channels
okano 2:c3459a955c8c 87 *
okano 2:c3459a955c8c 88 * Disable all channels
okano 2:c3459a955c8c 89 */
okano 2:c3459a955c8c 90 void disable( void );
okano 2:c3459a955c8c 91
okano 0:662ab6a5aa97 92 private:
okano 5:f4f72501148a 93 I2C *i2c_p;
okano 5:f4f72501148a 94 I2C &i2c;
okano 5:f4f72501148a 95 char i2c_addr;
okano 0:662ab6a5aa97 96 };
okano 0:662ab6a5aa97 97
okano 0:662ab6a5aa97 98 #endif // MBED_PCA9547_H