Differences

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--- en:c2_hardware_irq [2016/04/26 11:26]
charles.park [Usage]
+++ en:c2_hardware_irq [2017/03/02 11:05]
odroid [Hardware GPIO-IRQ]
@@ Line 3: / Line 3: @@
 **ODROID-C2** supports the GPIO interrupt of Edge trigger.\\
 The maximum number of interrupt is limited to 8 when you use the falling(Low) or rising(High) edge trigger.\\
-If you use the Both (rising and falling together) edge triggers, the maximum number is only 4.
+If you use the Both (rising and falling together) edge triggers, the maximum number is only 4. \\
-You must use the **Linux 3.14.29-56 Apr** or higher to use the GPIO interrupt in the user-land.
+Please note that SD card driver is using 2 interrupts to implement the card detection (insertion/remove) by default.\\
+So __**we can use only GPIO 6 IRQs**__.
+You must use the **Linux Kernel 3.14.29-56 Apr** or higher to use the GPIO interrupt in the user-land.
 ===== Usage =====
@@ Line 14: / Line 17: @@
 === GPIO Export ===
-echo [GPIO Number(Refer **[[en:c2_hardware|Expansion Connectors]]** )] > /sys/class/gpio/export
+echo [GPIO Number(Refer **[[en:c2_hardware#expansion_connectors]]** )] > /sys/class/gpio/export
-e.g) GPIOX.BIT21 Export (Header Pin Number 7)
+e.g) GPIOX.BIT21 Export (Pin Number 7)
 <code>
@@ Line 33: / Line 36: @@
 == Run ==
+"Usage: aml_gpio_irq [GPIO Number]"
 <code>
-sudo aml_gpio_irq_test [GPIO Number]
+sudo aml_gpio_irq_test 249
 </code>
@@ Line 288: / Line 293: @@
+===== Kernel driver GPIO IRQ Example code by crashoverride =====
+[[http://forum.odroid.com/viewtopic.php?f=112&t=18559|HC-SR04 kernel driver]]