From 287250b32dc18c781e45c103b0b4e3e5917d6c2e Mon Sep 17 00:00:00 2001
From: John Robertson <jj.robertson@asu.edu>
Date: Thu, 19 Nov 2015 22:57:45 -0700
Subject: [PATCH] hcsr04: Pass reference to current object to ISR.

This will allow users to call ackEdgeDetected() on the object passed into the function pointer, instead of requiring them to have a global reference to the object.

Signed-off-by: JJ Robertson <jjrob13@gmail.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
---
 src/hcsr04/hcsr04.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hcsr04/hcsr04.cxx b/src/hcsr04/hcsr04.cxx
index b89ee0b5..f30e9d82 100644
--- a/src/hcsr04/hcsr04.cxx
+++ b/src/hcsr04/hcsr04.cxx
@@ -63,7 +63,7 @@ HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void *)) {
     }
 
     mraa_gpio_dir(m_echoPinCtx, MRAA_GPIO_IN);
-    mraa_gpio_isr(m_echoPinCtx, MRAA_GPIO_EDGE_BOTH, fptr, NULL);
+    mraa_gpio_isr(m_echoPinCtx, MRAA_GPIO_EDGE_BOTH, fptr, (void*)this);
 }
 
 HCSR04::~HCSR04 () {