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91 lines
3.4 KiB
Markdown
91 lines
3.4 KiB
Markdown
# Example: GPIO
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This test code shows how to configure GPIO and how to use it with interruption.
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## GPIO functions:
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| GPIO | Direction | Configuration |
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| ---------------------------- | --------- | ------------------------------------------------------ |
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| CONFIG_GPIO_OUTPUT_0 | output | |
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| CONFIG_GPIO_OUTPUT_1 | output | |
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| CONFIG_GPIO_INPUT_0 | input | pulled up, interrupt from rising edge and falling edge |
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| CONFIG_GPIO_INPUT_1 | input | pulled up, interrupt from rising edge |
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## Test:
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1. Connect CONFIG_GPIO_OUTPUT_0 with CONFIG_GPIO_INPUT_0
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2. Connect CONFIG_GPIO_OUTPUT_1 with CONFIG_GPIO_INPUT_1
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3. Generate pulses on CONFIG_GPIO_OUTPUT_0/1, that triggers interrupt on CONFIG_GPIO_INPUT_0/1
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**Note:** The following pin assignments are used by default, you can change them by `idf.py menuconfig` > `Example Configuration`.
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| | CONFIG_GPIO_OUTPUT_0 | CONFIG_GPIO_OUTPUT_1 | CONFIG_GPIO_INPUT_0 | CONFIG_GPIO_INPUT_1 |
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| --------------- | -------------------- | -------------------- | ------------------- | ------------------- |
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| ESP32-C2/ESP32H2| 8 | 9 | 4 | 5 |
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| All other chips | 18 | 19 | 4 | 5 |
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## How to use example
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Before project configuration and build, be sure to set the correct chip target using `idf.py set-target <chip_name>`.
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### Hardware Required
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* A development board with any Espressif SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for Power supply and programming
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* Some jumper wires to connect GPIOs.
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### Configure the project
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### Build and Flash
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Build the project and flash it to the board, then run the monitor tool to view the serial output:
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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As you run the example, you will see the following log:
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```
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I (317) gpio: GPIO[18]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
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I (327) gpio: GPIO[19]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
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I (337) gpio: GPIO[4]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:1
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I (347) gpio: GPIO[5]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:1
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Minimum free heap size: 289892 bytes
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cnt: 0
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cnt: 1
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GPIO[4] intr, val: 1
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GPIO[5] intr, val: 1
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cnt: 2
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GPIO[4] intr, val: 0
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cnt: 3
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GPIO[4] intr, val: 1
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GPIO[5] intr, val: 1
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cnt: 4
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GPIO[4] intr, val: 0
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cnt: 5
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GPIO[4] intr, val: 1
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GPIO[5] intr, val: 1
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cnt: 6
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GPIO[4] intr, val: 0
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cnt: 7
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GPIO[4] intr, val: 1
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GPIO[5] intr, val: 1
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cnt: 8
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GPIO[4] intr, val: 0
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cnt: 9
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GPIO[4] intr, val: 1
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GPIO[5] intr, val: 1
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cnt: 10
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...
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```
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## Troubleshooting
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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