wimbeaumont Project / MCP23009

MCP23009 is a general IO I2C chip . This lib provide higher level interface ( set pin value, set io modes etc ) without need to have knowledge of the I2C registers

Dependents:   MCP23009tst

mcp23009.h@0:d829b4edd564, 2016-06-03 (annotated)

Committer:
wbeaumont
Date:
Fri Jun 03 12:40:49 2016 +0000
Revision:
0:d829b4edd564
Child:
1:9146d773a5a3
initial version not tested with hw

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wbeaumont 0:d829b4edd564 1 #ifndef MCP_23009_H
wbeaumont 0:d829b4edd564 2 #define MCP_23009_H
wbeaumont 0:d829b4edd564 3 #include "getVersion.h"
wbeaumont 0:d829b4edd564 4
wbeaumont 0:d829b4edd564 5 #include "stdbool.h"
wbeaumont 0:d829b4edd564 6
wbeaumont 0:d829b4edd564 7
wbeaumont 0:d829b4edd564 8 #include "dev_interface_def.h"
wbeaumont 0:d829b4edd564 9 #include "I2CInterface.h"
wbeaumont 0:d829b4edd564 10 #include "DACInterface.h"
wbeaumont 0:d829b4edd564 11
wbeaumont 0:d829b4edd564 12 #define VERSION_MCP23009_HDR "0.1"
wbeaumont 0:d829b4edd564 13
wbeaumont 0:d829b4edd564 14 /** MCP23009 class.
wbeaumont 0:d829b4edd564 15 * Used for interfacing with a mcp23009 8 bit io expander
wbeaumont 0:d829b4edd564 16 *
wbeaumont 0:d829b4edd564 17 * It has to be used with the https://developer.mbed.org/users/wbeaumont/code/DevInterfaces/ package
wbeaumont 0:d829b4edd564 18 * This includes the "virtual" I2CInterface class that is the interface to the I2C device
wbeaumont 0:d829b4edd564 19 * An implementation of the I2Cinterface class for the MBED can be found at
wbeaumont 0:d829b4edd564 20 * interrupt is not supported (yet )
wbeaumont 0:d829b4edd564 21 *
wbeaumont 0:d829b4edd564 22 * (C) Wim Beaumont Universiteit Antwerpen 2016
wbeaumont 0:d829b4edd564 23 *
wbeaumont 0:d829b4edd564 24 */
wbeaumont 0:d829b4edd564 25 class MCP23009 : public virtual getVersion {
wbeaumont 0:d829b4edd564 26
wbeaumont 0:d829b4edd564 27 public:
wbeaumont 0:d829b4edd564 28
wbeaumont 0:d829b4edd564 29
wbeaumont 0:d829b4edd564 30
wbeaumont 0:d829b4edd564 31
wbeaumont 0:d829b4edd564 32
wbeaumont 0:d829b4edd564 33 /** Create an mcp23009 I2C interface
wbeaumont 0:d829b4edd564 34 *
wbeaumont 0:d829b4edd564 35 * @param i2cinterface pointer to the I2C interface (proto type)
wbeaumont 0:d829b4edd564 36 * @param device_address_bits The 3bit address bits of the device ( set via an analogue value on the addresspin)
wbeaumont 0:d829b4edd564 37 */
wbeaumont 0:d829b4edd564 38 MCP23009(I2CInterface* i2cinterface, int device_address_bits );
wbeaumont 0:d829b4edd564 39
wbeaumont 0:d829b4edd564 40
wbeaumont 0:d829b4edd564 41 /** set IO pin to input or all , also set the pullup and poloarity ( default = no change
wbeaumont 0:d829b4edd564 42 * @param pinnr range 0 .. 8 if 8 all pins are set as input
wbeaumont 0:d829b4edd564 43 * @param pullup if positive pull up will be enabled 0 pull up will be disabled if negative no change
wbeaumont 0:d829b4edd564 44 * @param polarity if positive polaritye will be inverted 0 std polarity if negative no change
wbeaumont 0:d829b4edd564 45 * @return none zero in case of error
wbeaumont 0:d829b4edd564 46 */
wbeaumont 0:d829b4edd564 47 int set_as_input(int pinnr,int pullup, int polarity=-1 );
wbeaumont 0:d829b4edd564 48
wbeaumont 0:d829b4edd564 49 /** set IO pin to output
wbeaumont 0:d829b4edd564 50 * @param pinnr range 0 .. if 8 all pins are set as output
wbeaumont 0:d829b4edd564 51 * @param pullup if true pull up is enabled
wbeaumont 0:d829b4edd564 52 * @param polarity if true inverted polarity not yet tested if the polarity bit has effect on the output
wbeaumont 0:d829b4edd564 53 * @return none zero in case of error
wbeaumont 0:d829b4edd564 54 */
wbeaumont 0:d829b4edd564 55 int set_as_output(int pinnr ,int pullup,int polarity=-1 );
wbeaumont 0:d829b4edd564 56
wbeaumont 0:d829b4edd564 57 int status( int pinnr=8);
wbeaumont 0:d829b4edd564 58 int set( int pinnr , int value);
wbeaumont 0:d829b4edd564 59 protected:
wbeaumont 0:d829b4edd564 60 /** pointer to the I2C interface driver. */
wbeaumont 0:d829b4edd564 61 I2CInterface* _i2c_interface;
wbeaumont 0:d829b4edd564 62 /** The full i2c device address. */
wbeaumont 0:d829b4edd564 63 int _device_address;
wbeaumont 0:d829b4edd564 64 private :
wbeaumont 0:d829b4edd564 65 char data[5];
wbeaumont 0:d829b4edd564 66 int set_io_pin(bool input ,int pinnr,int pullup, int polarity );
wbeaumont 0:d829b4edd564 67 int pinmanipulation ( bool active , int pinnr );
wbeaumont 0:d829b4edd564 68 };
wbeaumont 0:d829b4edd564 69
wbeaumont 0:d829b4edd564 70 #endif