STM32定时器PWM输入捕获，利用TIM1计算脉冲频率及占空比。-This example shows how to use the TIM peripheral to measure the frequency and duty cycle of an external signal.

实现STM32单片机的各种功能，包括USART通信，pwm波的输出，及输入捕获，及SPI数据通信，I2C的FLASH数据读取。-STM32 microcontroller to achieve a variety of functions, including USART communications, pwm wave output, and input capture, and data communications SPI, I2C the FLASH data read.