Example: General Purpose Timer

This example uses the timer group driver to generate timer interrupts at two specified alarm intervals.

How to Use Example

Hardware Required

A development board with ESP SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
A USB cable for Power supply and programming

Build and Flash

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(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

Timer Group with auto reload
Group[0], timer[0] alarm event
------- EVENT TIME --------
Counter: 0x0000000000000008
Time   : 0.00000160 s
-------- TASK TIME --------
Counter: 0x0000000000004ed8
Time   : 0.00403680 s
Timer Group without auto reload
Group[1], timer[0] alarm event
------- EVENT TIME --------
Counter: 0x00000000017d7848
Time   : 5.00000160 s
-------- TASK TIME --------
Counter: 0x00000000017dcb32
Time   : 5.00424680 s
Timer Group with auto reload
Group[0], timer[0] alarm event
------- EVENT TIME --------
Counter: 0x0000000000000008
Time   : 0.00000160 s
-------- TASK TIME --------
Counter: 0x0000000000004dd4
Time   : 0.00398480 s

Functionality Overview

Two timers are configured
Each timer is set with some sample alarm interval
On reaching the interval value each timer will generate an alarm
One of the timers is configured to automatically reload it's counter value on the alarm
The other timer is configured to keep incrementing and is reloaded by the application each time the alarm happens
Alarms trigger subsequent interrupts, that is tracked with messages printed on the terminal:

Troubleshooting

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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