固件库: PY32L020_Firmware V1.2.1
芯片: PUYA
源文件: PUYA/PY32L020_Firmware_V1.2.1/Projects/PY32L020-STK/Example/TIM/TIM1_InputCapture/Src/main.c
功能简介
本示例演示定时器输入捕获功能。当外部信号边沿到来时,定时器自动记录当前计数值,可以精确测量信号的脉宽和频率。
完整代码
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#include "main.h"
int main(void)
{
/* Reset of all peripherals, Initializes the Systick. */
HAL_Init();
/* Initialize LED */
BSP_LED_Init(LED_GREEN);
TimHandle.Instance = TIM1; /* TIM1 */
TimHandle.Init.Period = 8000 - 1; /* Period = 8000 - 1 */
TimHandle.Init.Prescaler = 3000 - 1; /* Prescaler = 3000 - 1 */
TimHandle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; /* ClockDivision = 0 */
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; /* Counter direction = Up */
TimHandle.Init.RepetitionCounter = 1 - 1; /* Repetition = 0 */
TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; /* Auto-reload register not buffered */
if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK) /* Initialize TIM1 */
{
APP_ErrorHandler();
}
/* Select the edge of the active transition on the TI1 channel: rising edge */
sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
/* Select the active input: IC1 = TI1FP1 */
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
/* Set input prescaler: prescaler is disabled */
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
/* Configure the input filter duration: no filter needed */
sICConfig.ICFilter = 0;
/* Configure the Input Capture of channel 1 */
if (HAL_TIM_IC_ConfigChannel(&TimHandle, &sICConfig, TIM_CHANNEL_1) != HAL_OK)
{
APP_ErrorHandler();
}
/* Start the Input Capture in interrupt mode */
if (HAL_TIM_IC_Start_IT(&TimHandle, TIM_CHANNEL_1) != HAL_OK)
{
APP_ErrorHandler();
}
while (1)
{
}
}
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代码讲解
板级初始化:初始化开发板上的 LED、按键等基础外设。
定时器配置:设置预分频器(PSC)和重装载值(ARR),定时时间 = (PSC+1) × (ARR+1) / 时钟频率。