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timer_group: using isr callback in example

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morris
2021-02-01 14:10:15 +08:00
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commit face9518b2
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examples/peripherals/timer_group/README.md
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@@ -1,10 +1,51 @@
| Supported Targets | ESP32 |
| ----------------- | ----- |
# Example: timer_group
# 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](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.
## 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
@@ -14,23 +55,6 @@ This example uses the timer group driver to generate timer interrupts at two spe
* 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:
```
Example timer with auto reload
Group[0], timer[1] alarm event
------- EVENT TIME --------
Counter: 0x000000000000000a
Time : 0.00000200 s
-------- TASK TIME --------
Counter: 0x00000000000107ff
Time : 0.01351660 s
## Troubleshooting
Example timer without reload
Group[0], timer[0] alarm event
------- EVENT TIME --------
Counter: 0x00000000092ae316
Time : 30.76111800 s
-------- TASK TIME --------
Counter: 0x00000000092bd535
Time : 30.77351460 s
```
For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.