Yann Garcia / MCP23017_I2C

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependents:   MCP23017App

Embed: (wiki syntax)

« Back to documentation index

AbstractGpioExpender Class Reference
Public Types | Public Member Functions

AbstractGpioExpender Class Reference

This class describes a simplified interface for GPIO expender (e.g. More...

#include <AbstractGpioExpender.h>

Inherited by CMCP23017_I2C.

Public Types

enum  InterruptModes
 

Interrupt modes.

More...
enum  PullModes
 

Pull modes.

More...

Public Member Functions

virtual void reset ()=0
 Reset the device.
virtual void setupInterrupts (const unsigned char p_mirroring=0x00, const unsigned char p_openDrain=0x00, const unsigned char p_polarity=0x00)=0
 Setup device interrupt mechanism.
virtual int setupInterruptPin (const unsigned char p_gpioId, const InterruptModes p_mode=OnRising)=0
 Setup interrupt mode for a specific IO port.
virtual int setupPullPin (const unsigned char p_gpioId, const PullModes p_mode=PullOff)=0
 Setup pull mode for a specific IO port.
virtual int getLastInterruptPinAndValue (unsigned char *p_gpioId, unsigned char *p_value)=0
 Get interrupt information and clear it.
virtual void setIntrACallback (void(*p_fptr)(void))=0
 Attach a function to call when a interrupt occurs on the GPIOA input ports.
virtual void setIntrBCallback (void(*p_fptr)(void))=0
 Attach a function to call when a interrupt occurs on the GPIOB input ports.
virtual int read (const unsigned char p_gpioId, unsigned char *p_value)=0
 Read the specific GPIO port pin.
virtual int write (const unsigned char p_gpioId, const unsigned char p_value)=0
 Write value to the specific GPIO port pin.

Detailed Description

This class describes a simplified interface for GPIO expender (e.g.

Microchip MCP23x17)

Definition at line 47 of file AbstractGpioExpender.h.

Member Enumeration Documentation

enum InterruptModes

Interrupt modes.

Definition at line 51 of file AbstractGpioExpender.h.

enum PullModes

Pull modes.

Definition at line 59 of file AbstractGpioExpender.h.

Member Function Documentation

virtual int getLastInterruptPinAndValue ( unsigned char *  p_gpioId,
unsigned char *  p_value 
) [pure virtual]

Get interrupt information and clear it.

Parameters:
p_gpioIdThe IO port identifier where the interrupt occured
p_valueThe logic value on the pin port where the interrupt occured
Returns:
0 on success, -1 on wrong parameters and -2 otherwise

Implemented in CMCP23017_I2C.

virtual int read ( const unsigned char  p_gpioId,
unsigned char *  p_value 
) [pure virtual]

Read the specific GPIO port pin.

Parameters:
p_gpioIdThe GPIO port pin to be read
p_valueThe GPIO port pin value
Returns:
0 on success, -1 on wrong parameters and -2 otherwise

Implemented in CMCP23017_I2C.

virtual void reset (  ) [pure virtual]

Reset the device.

Implemented in CMCP23017_I2C.

virtual void setIntrACallback ( void(*)(void)  p_fptr ) [pure virtual]

Attach a function to call when a interrupt occurs on the GPIOA input ports.

Parameters:
p_fptrThe pointer to the "C" callback function

Implemented in CMCP23017_I2C.

virtual void setIntrBCallback ( void(*)(void)  p_fptr ) [pure virtual]

Attach a function to call when a interrupt occurs on the GPIOB input ports.

Parameters:
p_fptrThe pointer to the "C" callback function

Implemented in CMCP23017_I2C.

virtual int setupInterruptPin ( const unsigned char  p_gpioId,
const InterruptModes  p_mode = OnRising 
) [pure virtual]

Setup interrupt mode for a specific IO port.

Parameters:
p_gpioIdThe IO port identifier
p_modeThe interrupt mode
Returns:
0 on success, -1 on wrong parameters and -2 otherwise

Implemented in CMCP23017_I2C.

virtual void setupInterrupts ( const unsigned char  p_mirroring = 0x00,
const unsigned char  p_openDrain = 0x00,
const unsigned char  p_polarity = 0x00 
) [pure virtual]

Setup device interrupt mechanism.

Parameters:
p_mirroringSet to 0x00 to disable INTA/B mirroring, 0x01 otherwise. Default: 0x00
p_openDrainSet to 0x00 for active driver output, 0x01 for opn drain output. Default: 0x00
p_polaritySet to 0x00 for interrupt active low, 0x01 otherwise. Default: 0x00

Implemented in CMCP23017_I2C.

virtual int setupPullPin ( const unsigned char  p_gpioId,
const PullModes  p_mode = PullOff 
) [pure virtual]

Setup pull mode for a specific IO port.

Parameters:
p_gpioIdThe IO port identifier
p_modeThe interrupt mode
Returns:
0 on success, -1 on wrong parameters and -2 otherwise

Implemented in CMCP23017_I2C.

virtual int write ( const unsigned char  p_gpioId,
const unsigned char  p_value 
) [pure virtual]

Write value to the specific GPIO port pin.

Parameters:
p_gpioIdThe GPIO port pin to be written
p_valueThe GPIO port pin value
Returns:
0 on success, -1 on wrong parameters and -2 otherwise

Implemented in CMCP23017_I2C.

Generated on Tue Jul 12 2022 15:16:48 by  doxygen 1.7.2