MG32F10x Standard Peripherals Firmware Library
|
*************** (C) COPYRIGHT 2020 - 2023 megawin Technology *************** * @file TIM/TIM_PWM_Input/readme.txt * @author megawin Application Team * @version V0.1.10 * @date 05-January-2023 * @brief Description of the TIM_PWM_Input example. ****************************************************************************** * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, MEGAWIN SHALL NOT BE HELD LIABLE FOR ANY DIRECT, * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM * THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. ******************************************************************************
This example shows how to use the TIM peripheral to measure the frequency and duty cycle of an external signal.
The system clock works at 96Mhz and is generated through PLL configuration. The PLL clock source is an external 8Mhz crystal oscillator. The frequency division ratio of APB1 is 1, and the frequency division ratio of APB2 is 1.
The TIMXCLK frequency is set to SystemCoreClock(Hz),the Prescaler is 0,so the TIM1 counter clock is SystemCoreClock(Hz).
SystemCoreClock is set to 96MHz。
TIM1 is configured in PWM Input Mode: the external signal is connected to TIM1 Channel1 used as input pin.
To measure the frequency and the duty cycle we use the TIM1 CC1 interrupt request,
so In the TIM1_IRQHandler routine, the frequency and the duty cycle of the external signal are computed.
The "Frequency" variable contains the external signal frequency:
Frequency = TIM1 counter clock / (TIM1_CCR1 + 1),unit:Hz,
The "DutyCycle" variable contains the external signal duty cycle:
DutyCycle = ((float)(IC2Value + 1) * 100) / (IC1Value + 1);
The minimum frequency value to measure is92Hz。
In order to make the program work, you must do the following :
Run the example