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en:c2_hardware_irq [2016/04/26 11:35] charles.park [Usage] |
en:c2_hardware_irq [2017/03/08 08:00] (current) odroid [Hardware GPIO-IRQ] |
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| **ODROID-C2** supports the GPIO interrupt of Edge trigger.\\ | **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.\\ | 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**__. \\ | ||
| + | If you use an eMMC without SD card, you can access full 8 GPIO IRQs once you [[http://forum.odroid.com/viewtopic.php?f=136&t=26055&p=182162#p182037|disable the SD functionality]]. | ||
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| + | You must use the **Linux Kernel 3.14.29-56 Apr** or higher to use the GPIO interrupt in the user-land. | ||
| ===== Usage ===== | ===== Usage ===== | ||
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| + | ===== Kernel driver GPIO IRQ Example code by crashoverride ===== | ||
| + | |||
| + | [[http://forum.odroid.com/viewtopic.php?f=112&t=18559|HC-SR04 kernel driver]] | ||
