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