# GPTMR测量PWM

## 概述

pwm_measure示例工程演示了GPTMR测量PWM波的功能。

## 硬件设置

请参考具体开发板{ref}`引脚描述 <lab_board_resource>`部分的描述。
连接外部PWM至GPTMR输入捕获引脚。

## 运行现象

运行工程，示例执行GPTMR的测量PWM波的功能，若有PWM波输入，串口终端输出如下信息，分别是PWM波的频率和占空比。
```console
gptmr pwm measure test
[table_0]measured frequency: 1000.049987
[table_0]measured duty cycle: 50.00%
[table_1]measured frequency: 1000.049987
[table_1]measured duty cycle: 50.00%
[table_2]measured frequency: 1000.049987
[table_2]measured duty cycle: 50.00%
[table_3]measured frequency: 1000.049987
[table_3]measured duty cycle: 50.00%
[table_4]measured frequency: 1000.049987
[table_4]measured duty cycle: 50.00%
[table_5]measured frequency: 1000.049987
[table_5]measured duty cycle: 50.00%
[table_6]measured frequency: 1000.049987
[table_6]measured duty cycle: 50.00%
[table_7]measured frequency: 1000.049987
[table_7]measured duty cycle: 50.00%
[table_8]measured frequency: 1000.049987
[table_8]measured duty cycle: 50.00%
[table_9]measured frequency: 1000.059997
[table_9]measured duty cycle: 50.00%

```