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a110x: Add interrupt support and a suitable example

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Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>
This commit is contained in:
Jon Trulson
2015-03-25 12:58:02 -06:00
committed by John Van Drasek
parent 317ad35180
commit 4bb077e70b
4 changed files with 118 additions and 2 deletions
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22
src/a110x/a110x.cxx
View File

@ -31,8 +31,6 @@ using namespace std;
A110X::A110X(int pin)
{
mraa_init();
if ( !(m_gpio = mraa_gpio_init(pin)) )
{
cerr << __FUNCTION__ << ": mraa_gpio_init() failed" << endl;
@ -40,10 +38,14 @@ A110X::A110X(int pin)
}
mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
m_isrInstalled = false;
}
A110X::~A110X()
{
if (m_isrInstalled)
uninstallISR();
mraa_gpio_close(m_gpio);
}
@ -52,3 +54,19 @@ bool A110X::magnetDetected()
return (!mraa_gpio_read(m_gpio) ? true : false);
}
void A110X::installISR(void (*isr)(void *), void *arg)
{
if (m_isrInstalled)
uninstallISR();
// install our interrupt handler
mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_FALLING,
isr, arg);
m_isrInstalled = true;
}
void A110X::uninstallISR()
{
mraa_gpio_isr_exit(m_gpio);
m_isrInstalled = false;
}

20
src/a110x/a110x.h
View File

@ -50,7 +50,10 @@ namespace upm {
* whether it is detecting a magnetic field with south polarity
* perpendicular to the sensor element.
*
* An example showing a simple test for the presence of a field
* @snippet a110x.cxx Interesting
* An example demonstrating the use of an interrupt handler to count pulses
* @snippet a110x-intr.cxx Interesting
*/
class A110X {
public:
@ -71,7 +74,24 @@ namespace upm {
*/
bool magnetDetected();
/**
* Install an Interrupt Service Routine (ISR) to be called when
* the appropriate magnetic field is detected.
*
* @param fptr function pointer to function to be called on interrupt
* @param arg pointer to an object that will be supplied as an
* arguement to the ISR.
*/
void installISR(void (*isr)(void *), void *arg);
/**
* Uninstall the previously installed Interrupt Service Routine (ISR)
*
*/
void uninstallISR();
private:
bool m_isrInstalled;
mraa_gpio_context m_gpio;
};
}