stm32f103zet6如何识别1到5V,且频率在100到100kHz的正弦波、三角波、阵波,并测量其信号的频率和峰峰值,写出实现所有功能的代码
时间: 2023-06-16 13:04:15 浏览: 449
要实现这个功能,可以使用STM32的ADC(模数转换器)和定时器。以下是一种可能的实现方法:
1. 配置ADC,使其能够读取0到3.3V或0到5V的输入信号。如果需要读取-1到1V或-2.5到2.5V的信号,可以使用电阻分压器将信号范围变换到0到3.3V或0到5V。
2. 配置定时器,使其能够测量输入信号的频率。可以使用定时器的输入捕获模式来测量信号的周期,并计算出频率。
3. 使用中断服务程序(ISR)来处理ADC和定时器的数据。在ADC的ISR中,可以将读取的数据转换为实际信号的峰峰值。在定时器的ISR中,可以计算输入信号的频率。
4. 编写一个主循环,在其中读取输入信号并将其转换为峰峰值和频率。可以使用一个状态机来检测输入信号的类型(正弦波、三角波或阵波),并相应地计算峰峰值和频率。
以下是一个可能的实现代码(仅作参考):
```c
#include "stm32f10x.h"
#define ADC_CHANNEL 0 // ADC输入通道
#define SAMPLE_RATE 10000 // ADC采样率
#define TIMER_FREQ 72000000 // 定时器频率
#define NUM_SAMPLES 1000 // 每个信号周期的样本数
volatile uint16_t adc_value = 0; // 最新的ADC值
volatile uint32_t timer_value = 0; // 最新的定时器值
volatile uint32_t timer_capture_1 = 0; // 定时器捕获值1
volatile uint32_t timer_capture_2 = 0; // 定时器捕获值2
volatile uint32_t period = 0; // 信号周期
volatile uint32_t frequency = 0; // 信号频率
volatile uint16_t max_value = 0; // 信号峰峰值
enum signal_type {
NONE,
SINE,
TRIANGLE,
SQUARE
};
volatile enum signal_type current_signal = NONE;
void init_adc(void) {
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitTypeDef adc_init;
ADC_StructInit(&adc_init);
adc_init.ADC_Mode = ADC_Mode_Independent;
adc_init.ADC_ScanConvMode = DISABLE;
adc_init.ADC_ContinuousConvMode = ENABLE;
adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
adc_init.ADC_DataAlign = ADC_DataAlign_Right;
adc_init.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &adc_init);
ADC_Cmd(ADC1, ENABLE);
ADC_RegularChannelConfig(ADC1, ADC_CHANNEL, 1, ADC_SampleTime_239Cycles5);
}
void init_timer(void) {
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef timer_init;
timer_init.TIM_Prescaler = (TIMER_FREQ / SAMPLE_RATE) - 1;
timer_init.TIM_CounterMode = TIM_CounterMode_Up;
timer_init.TIM_Period = NUM_SAMPLES - 1;
timer_init.TIM_ClockDivision = TIM_CKD_DIV1;
timer_init.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &timer_init);
TIM_Cmd(TIM2, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);
}
void init_interrupts(void) {
NVIC_InitTypeDef nvic_init;
nvic_init.NVIC_IRQChannel = TIM2_IRQn;
nvic_init.NVIC_IRQChannelPreemptionPriority = 0;
nvic_init.NVIC_IRQChannelSubPriority = 0;
nvic_init.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic_init);
nvic_init.NVIC_IRQChannel = ADC1_2_IRQn;
NVIC_Init(&nvic_init);
}
void TIM2_IRQHandler(void) {
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
timer_value = 0;
current_signal = NONE;
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
if (timer_capture_1 == 0) {
timer_capture_1 = TIM_GetCapture1(TIM2);
} else {
timer_capture_2 = TIM_GetCapture1(TIM2);
period = (timer_capture_2 - timer_capture_1) * 2;
frequency = TIMER_FREQ / period;
timer_capture_1 = 0;
timer_capture_2 = 0;
}
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
if (current_signal == NONE) {
current_signal = SINE;
} else if (current_signal == SINE) {
current_signal = TRIANGLE;
} else if (current_signal == TRIANGLE) {
current_signal = SQUARE;
} else if (current_signal == SQUARE) {
current_signal = NONE;
}
max_value = 0;
for (int i = 0; i < NUM_SAMPLES; i++) {
uint16_t value = ADC_GetConversionValue(ADC1);
if (value > max_value) {
max_value = value;
}
adc_value = value;
while (TIM_GetFlagStatus(TIM2, TIM_FLAG_Update) == RESET);
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
}
}
}
void ADC1_2_IRQHandler(void) {
if (ADC_GetITStatus(ADC1, ADC_IT_EOC) != RESET) {
ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);
adc_value = ADC_GetConversionValue(ADC1);
}
}
int main(void) {
init_adc();
init_timer();
init_interrupts();
while (1) {
if (current_signal == SINE) {
// 计算正弦波的峰峰值和频率
float amplitude = (float) max_value * 3.3 / 4095;
float peak_to_peak = amplitude * 2;
printf("Sine wave: frequency=%dHz, peak-to-peak=%fV\n", frequency, peak_to_peak);
} else if (current_signal == TRIANGLE) {
// 计算三角波的峰峰值和频率
float amplitude = (float) max_value * 3.3 / 4095;
float peak_to_peak = amplitude * 2;
printf("Triangle wave: frequency=%dHz, peak-to-peak=%fV\n", frequency, peak_to_peak);
} else if (current_signal == SQUARE) {
// 计算阵波的峰峰值和频率
float amplitude = (float) max_value * 3.3 / 4095;
float peak_to_peak = amplitude * 2;
printf("Square wave: frequency=%dHz, peak-to-peak=%fV\n", frequency, peak_to_peak);
}
// 延时一段时间,等待下一个信号周期
for (int i = 0; i < 100000; i++);
}
}
```
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