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Wangjialin ade7ee2092 gpio_driver: add per-pin interrupt handlers 1. add ISR handler apis so that users of different layers can hook their own isr handler on different GPIO. Audio project has different software layers, they need different gpio isr handler for layer instead of processing all GPIO interrupts in one handler. If this kind of calling a handler from isr is not proper, please kindly point out. 2. add gpio example code. 3. improve gpio.rst 4. add readme for gpio example Squashed commits: [278e50f] update: GPIO 1. coding style, add a space between conditional or loop keyword and an opening paren. 2. modify some return value and doc 3. use printf in example code Squashed commits: [efb23bb] minor change of comment		2016-12-29 11:16:32 +08:00
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main	gpio_driver: add per-pin interrupt handlers	2016-12-29 11:16:32 +08:00
Makefile	gpio_driver: add per-pin interrupt handlers	2016-12-29 11:16:32 +08:00
README.md	gpio_driver: add per-pin interrupt handlers	2016-12-29 11:16:32 +08:00

README.md

Example: GPIO

###This test code shows how to configure gpio and how to use gpio interrupt.

####GPIO functions:

GPIO18: output
GPIO19: output
GPIO4: input, pulled up, interrupt from rising edge and falling edge
GPIO5: input, pulled up, interrupt from rising edge.

####Test:

Connect GPIO18 with GPIO4
Connect GPIO19 with GPIO5
Generate pulses on GPIO18/19, that triggers interrupt on GPIO4/5