laelaps::LaeI2CMuxReset Class Reference

Laelaps I2C multiplexer reset class. More...

#include <laeGpio.h>

Inheritance diagram for laelaps::LaeI2CMuxReset:

Public Member Functions
	LaeI2CMuxReset ()
	Default constructor.
virtual	~LaeI2CMuxReset ()
	Destructor.
virtual void	sync ()
	Synchronized this with GPIO hardware state.
void	reset ()
	Reset the I2C mulitplex chip. More...
Public Member Functions inherited from laelaps::LaeGpio
	LaeGpio (const std::string &strTag, const int gpio, const LaeGpio::Direction dir)
	Default intialization constructor. More...
virtual	~LaeGpio ()
	Destructor.
virtual int	writeValue (const LaeGpio::TriState value)
	Write value to gpio. More...
virtual int	writeValue (const int value)
	Write value to gpio. More...
virtual int	readValue (int &value)
	Read current value of gpio. More...
int	hasValue () const
	Get the current shadowed gpio value. More...
bool	isConfigured () const
	Is the exported GPIO number configured to match this ojbect? More...

Static Public Attributes
static const int	TTrans = 10000
	signal transition time (usec)
static const int	TReboot = 10000
	reboot time (usec)

Additional Inherited Members
Public Types inherited from laelaps::LaeGpio
enum	TriState {   UNKNOWN = -1,   LOW = 0,   HIGH = 1 }
	GPIO tri-state value. More...
enum	Direction {   INPUT = GPIO_DIR_IN,   OUTPUT = GPIO_DIR_OUT }
	GPIO direction. More...
Protected Member Functions inherited from laelaps::LaeGpio
bool	checkConfig ()
	Check if the exported GPIO exists in /sys/class and that it has been configured to match this objects configuration. More...
Protected Attributes inherited from laelaps::LaeGpio
std::string	m_gpioTag
	identifying tag
int	m_gpioNum
	exported GPIO number
LaeGpio::Direction	m_gpioDir
	GPIO direction.
int	m_gpioVal
	shadowed value
bool	m_gpioCfg
	GPIO is [not] configured (correctly)

Detailed Description

Laelaps I2C multiplexer reset class.

Definition at line 303 of file laeGpio.h.

Member Function Documentation

void LaeI2CMuxReset::reset

(

)

Reset the I2C mulitplex chip.

The reset is caused by a high to low edge trigger.

Definition at line 309 of file laeGpio.cxx.

References laelaps::LaeGpio::hasValue(), laelaps::LaeGpio::isConfigured(), laelaps::LAE_OK, laelaps::LaeGpio::LOW, laelaps::LaeGpio::m_gpioVal, laelaps::LaeGpio::sync(), laelaps::LaeGpio::UNKNOWN, and laelaps::LaeGpio::writeValue().

{
  // lazy one-time synchronization
  if( m_gpioVal == LaeGpio::UNKNOWN )
  {
    sync();
  }

  // versions 2.1+ have reset line to watchdog sub-processor
  if( isConfigured() )
  {
    // transition high to low
    if( writeValue(1) == LAE_OK )
    {
      usleep(TTrans);
      writeValue(0);
      usleep(TTrans);

      if( hasValue() == LaeGpio::LOW )
      {
        usleep(TReboot);
      }
    }
  }
}

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The documentation for this class was generated from the following files:

• include/Laelaps/laeGpio.h
• sw/liblaelaps/laeGpio.cxx