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61 lines
1.9 KiB
Markdown
61 lines
1.9 KiB
Markdown
# Example: General Purpose Timer
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This example uses the timer group driver to generate timer interrupts at two specified alarm intervals.
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## How to Use Example
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### Hardware Required
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* A development board with ESP 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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### Build and Flash
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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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```
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Timer Group with auto reload
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Group[0], timer[0] alarm event
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------- EVENT TIME --------
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Counter: 0x0000000000000008
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Time : 0.00000160 s
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-------- TASK TIME --------
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Counter: 0x0000000000004ed8
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Time : 0.00403680 s
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Timer Group without auto reload
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Group[1], timer[0] alarm event
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------- EVENT TIME --------
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Counter: 0x00000000017d7848
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Time : 5.00000160 s
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-------- TASK TIME --------
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Counter: 0x00000000017dcb32
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Time : 5.00424680 s
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Timer Group with auto reload
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Group[0], timer[0] alarm event
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------- EVENT TIME --------
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Counter: 0x0000000000000008
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Time : 0.00000160 s
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-------- TASK TIME --------
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Counter: 0x0000000000004dd4
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Time : 0.00398480 s
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```
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## Functionality Overview
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* Two timers are configured
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* Each timer is set with some sample alarm interval
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* On reaching the interval value each timer will generate an alarm
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* One of the timers is configured to automatically reload it's counter value on the alarm
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* The other timer is configured to keep incrementing and is reloaded by the application each time the alarm happens
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* Alarms trigger subsequent interrupts, that is tracked with messages printed on the terminal:
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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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