GPIO Example

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

GPIO functions

GPIO15: output
GPIO16: output
GPIO4: input, pulled up, interrupt from rising edge and falling edge
GPIO5: input, pulled up, interrupt from rising edge.

How to use example

Hardware Required

Connect GPIO15 with GPIO4
Connect GPIO16 with GPIO5

Configure the project

make menuconfig

Set serial port under Serial Flasher Options.

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

make -j4 flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

Generate pulses on GPIO15/16, that triggers interrupt on GPIO4/5

I (0) gpio: GPIO[15]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (0) gpio: GPIO[16]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (0) gpio: GPIO[4]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:1
I (0) gpio: GPIO[5]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:1
I (0) main: cnt: 0

I (1) main: cnt: 1

I (1) main: GPIO[4] intr, val: 1

I (1) main: GPIO[5] intr, val: 1

I (2) main: cnt: 2

I (2) main: GPIO[4] intr, val: 0

I (3) main: cnt: 3

I (3) main: GPIO[4] intr, val: 1

I (3) main: GPIO[5] intr, val: 1

I (4) main: cnt: 4

I (4) main: GPIO[4] intr, val: 0

I (5) main: cnt: 5

I (5) main: GPIO[4] intr, val: 1

I (5) main: GPIO[5] intr, val: 1

I (6) main: cnt: 6

I (6) main: GPIO[4] intr, val: 0