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esp-idf/examples/peripherals/timer_group
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laokaiyao 8b2331a810 driver/timer: only re-enable alarm in callback when auto reload is true 
closes https://github.com/espressif/esp-idf/issues/7001
2021-07-13 17:22:33 +08:00
..
main timer_group: using isr callback in example 2021-04-22 11:21:41 +08:00
CMakeLists.txt build_app: make multi target support readable 2020-04-09 16:40:57 +08:00
example_test.py driver/timer: only re-enable alarm in callback when auto reload is true 2021-07-13 17:22:33 +08:00
Makefile Whitespace: Automated whitespace fixes (large commit) 2020-11-11 07:36:35 +00:00
README.md timer_group: using isr callback in example 2021-04-22 11:21:41 +08:00

README.md

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.