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80 lines
3.8 KiB
Markdown
80 lines
3.8 KiB
Markdown
| Supported Targets | ESP32-S2 |
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| ----------------- | -------- |
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# Matrix Keyboard Example (based on Dedicated 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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## Overview
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This example mainly illustrates how to drive a common matrix keyboard using the dedicated GPIO APIs, including:
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* Manipulate the level on a group of GPIOs
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* Trigger edge interrupt
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* Read level on a group of GPIOs
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Dedicated GPIO is designed to speed up CPU operations on one or a group of GPIOs by writing assembly codes with Espressif customized instructions (please refer TRM to get more information about these instructions).
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This matrix keyboard driver is interrupt-driven, supports a configurable debounce time. GPIOs used by row and column lines are also configurable during driver installation stage.
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## How to use example
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### Hardware Required
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This example can run on any target that has the dedicated feature (e.g. ESP32-S2). It's not necessary for your matrix board to have pull-up resisters on row/column lines. The driver has enabled internal pull-up resister by default. A typical matrix board should look as follows:
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```
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row_0 +--------+-------------------+------------------------------+-----------------+
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| + | + | +
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| +-+-+ | +-+-+ ...... | +-+-+
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. +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
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. | | |
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. . | . | . |
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. | . | ...... . |
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. | . | . |
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. | . | . |
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row_n +--------+-------------------+------------------------------+-----------------+
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| + | | + | | + |
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| +-+-+ | | +-+-+ | ...... | +-+-+ |
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+-----+ +-----+ +-----+ +-----+ +-----+ +-----+
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+ + +
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col_0 col_1 ...... col_m
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```
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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```
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I (2883) example: press event, key code = 0002
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I (3003) example: release event, key code = 0002
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I (5053) example: press event, key code = 0001
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I (5203) example: release event, key code = 0001
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I (6413) example: press event, key code = 0000
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I (6583) example: release event, key code = 0000
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I (7963) example: press event, key code = 0003
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I (8113) example: release event, key code = 0003
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I (8773) example: press event, key code = 0103
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I (8923) example: release event, key code = 0103
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I (9543) example: press event, key code = 0203
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I (9683) example: release event, key code = 0203
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```
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