stm32f103c8t6测电容
时间: 2023-09-27 17:10:14 浏览: 43
要测量电容,您可以使用STM32的定时器模块来测量电容充电或放电的时间,并根据电容的值计算出电容的大小。下面是一个简单的示例代码,用于测量一个电容的值:
```c
#include "stm32f10x.h"
#define CAP_CHARGE_PIN GPIO_Pin_0
#define CAP_CHARGE_PORT GPIOA
#define CAP_DISCHARGE_PIN GPIO_Pin_1
#define CAP_DISCHARGE_PORT GPIOA
#define CAP_MEASURE_PIN GPIO_Pin_2
#define CAP_MEASURE_PORT GPIOA
void TIM2_IRQHandler(void);
volatile uint16_t cap_value; //电容值
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
//设置GPIO
GPIO_InitStructure.GPIO_Pin = CAP_CHARGE_PIN | CAP_DISCHARGE_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(CAP_CHARGE_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = CAP_MEASURE_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(CAP_MEASURE_PORT, &GPIO_InitStructure);
//设置TIM2
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1; //1us定时器频率
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
//设置TIM2输入捕获模式
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x00;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
//启用TIM2中断
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (1)
{
//开始充电
GPIO_ResetBits(CAP_CHARGE_PORT, CAP_CHARGE_PIN);
GPIO_SetBits(CAP_DISCHARGE_PORT, CAP_DISCHARGE_PIN);
//等待电容充满
while (GPIO_ReadInputDataBit(CAP_MEASURE_PORT, CAP_MEASURE_PIN) == RESET);
//开始放电
GPIO_ResetBits(CAP_DISCHARGE_PORT, CAP_DISCHARGE_PIN);
GPIO_SetBits(CAP_CHARGE_PORT, CAP_CHARGE_PIN);
//启动定时器
TIM_SetCounter(TIM2, 0);
TIM_ITConfig(TIM2, TIM_IT_CC3, ENABLE);
TIM_Cmd(TIM2, ENABLE);
//等待定时器中断
while (TIM_GetFlagStatus(TIM2, TIM_FLAG_CC3) == RESET);
//计算电容值
cap_value = TIM_GetCapture3(TIM2);
cap_value = cap_value * SystemCoreClock / 1000000 / 2; //计算定时器计数值对应的时间,除以2是因为充电和放电各需要一半的时间
cap_value = 1000000 / cap_value; //计算电容值,假设电容单位为uF
//关闭定时器
TIM_ITConfig(TIM2, TIM_IT_CC3, DISABLE);
TIM_Cmd(TIM2, DISABLE);
}
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);
}
}
```
在上面的代码中,我们使用PA0和PA1控制电容的充电和放电,使用PA2测量电容的电压,使用TIM2定时器测量电容充电或放电的时间。当电容充满时,我们开始放电并启动定时器,等待定时器计数完成,然后计算电容值。这个示例代码仅供参考,您可以根据自己的需求进行修改。
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