写使用32标准库生成的ADC模块采样1kHz的正弦波程序‘
时间: 2023-03-13 18:46:26 浏览: 56
我可以为您提供一个示例程序: #include <stdio.h> #include <avr/io.h> #include <avr/interrupt.h> #define F_CPU 16000000UL #define BAUD 9600 #define MYUBRR F_CPU/16/BAUD-1 // ADC初始化 void adc_init(void) { // 选择VREF为AVCC并且预分频系数为128 ADMUX |= (1<<REFS0)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0); // 启用ADC ADCSRA |= (1<<ADEN); } // ADC采样 void adc_sample(void) { // 开始转换 ADCSRA |= (1<<ADSC); // 等待ADC转换完毕 while (ADCSRA & (1<<ADSC)); } int main(void) { DDRB |= 0xFF; // 将PORTB设为输出 adc_init(); // ADC初始化 while(1) { adc_sample(); // ADC采样 PORTB = ADCH; // 写入PORTB } }
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STM32 ADC 采样 正弦波 代码
下面是一个基于STM32的ADC采集正弦波的示例代码:
首先,需要配置ADC模块的参数,包括采样通道、采样时间、采样时钟等。在此示例中,我们使用PA0引脚作为ADC采样通道,采样时间为15个时钟周期,采样时钟为PCLK2/2。
```
// Configure ADC
ADC_InitTypeDef ADC_InitStruct;
ADC_CommonInitTypeDef ADC_CommonInitStruct;
ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStruct);
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ScanConvMode = DISABLE;
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStruct);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);
ADC_Cmd(ADC1, ENABLE);
```
接下来,我们可以使用TIM2定时器来生成正弦波信号。在此示例中,我们使用PA1引脚输出正弦波信号,TIM2定时器的周期为1000个时钟周期,即1kHz的频率。为了产生正弦波,我们使用一个256个点的正弦波表,每个点的值为-1到1之间的浮点数。
```
// Configure TIM2
TIM_TimeBaseInitTypeDef TIM_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_TIM2);
TIM_TimeBaseStructInit(&TIM_InitStruct);
TIM_InitStruct.TIM_Period = 1000;
TIM_InitStruct.TIM_Prescaler = 84;
TIM_InitStruct.TIM_ClockDivision = 0;
TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_InitStruct);
TIM_Cmd(TIM2, ENABLE);
// Generate sine wave
float sine_table[256] = {0.0000, 0.0245, 0.0491, 0.0736, 0.0980, 0.1224, 0.1467, 0.1710, 0.1951, 0.2191, 0.2429, 0.2667, 0.2903, 0.3137, 0.3369, 0.3599, 0.3827, 0.4052, 0.4276, 0.4496, 0.4714, 0.4929, 0.5141, 0.5350, 0.5556, 0.5758, 0.5957, 0.6152, 0.6344, 0.6532, 0.6716, 0.6895, 0.7071, 0.7242, 0.7409, 0.7572, 0.7730, 0.7883, 0.8032, 0.8176, 0.8315, 0.8449, 0.8577, 0.8701, 0.8819, 0.8932, 0.9039, 0.9142, 0.9239, 0.9330, 0.9415, 0.9495, 0.9569, 0.9638, 0.9700, 0.9757, 0.9808, 0.9853, 0.9892, 0.9925, 0.9952, 0.9973, 0.9988, 0.9997, 1.0000, 0.9997, 0.9988, 0.9973, 0.9952, 0.9925, 0.9892, 0.9853, 0.9808, 0.9757, 0.9700, 0.9638, 0.9569, 0.9495, 0.9415, 0.9330, 0.9239, 0.9142, 0.9039, 0.8932, 0.8819, 0.8701, 0.8577, 0.8449, 0.8315, 0.8176, 0.8032, 0.7883, 0.7730, 0.7572, 0.7409, 0.7242, 0.7071, 0.6895, 0.6716, 0.6532, 0.6344, 0.6152, 0.5957, 0.5758, 0.5556, 0.5350, 0.5141, 0.4929, 0.4714, 0.4496, 0.4276, 0.4052, 0.3827, 0.3599, 0.3369, 0.3137, 0.2903, 0.2667, 0.2429, 0.2191, 0.1951, 0.1710, 0.1467, 0.1224, 0.0980, 0.0736, 0.0491, 0.0245, 0.0000, -0.0245, -0.0491, -0.0736, -0.0980, -0.1224, -0.1467, -0.1710, -0.1951, -0.2191, -0.2429, -0.2667, -0.2903, -0.3137, -0.3369, -0.3599, -0.3827, -0.4052, -0.4276, -0.4496, -0.4714, -0.4929, -0.5141, -0.5350, -0.5556, -0.5758, -0.5957, -0.6152, -0.6344, -0.6532, -0.6716, -0.6895, -0.7071, -0.7242, -0.7409, -0.7572, -0.7730, -0.7883, -0.8032, -0.8176, -0.8315, -0.8449, -0.8577, -0.8701, -0.8819, -0.8932, -0.9039, -0.9142, -0.9239, -0.9330, -0.9415, -0.9495, -0.9569, -0.9638, -0.9700, -0.9757, -0.9808, -0.9853, -0.9892, -0.9925, -0.9952, -0.9973, -0.9988, -0.9997, -1.0000, -0.9997, -0.9988, -0.9973, -0.9952, -0.9925, -0.9892, -0.9853, -0.9808, -0.9757, -0.9700, -0.9638, -0.9569, -0.9495, -0.9415, -0.9330, -0.9239, -0.9142, -0.9039, -0.8932, -0.8819, -0.8701, -0.8577, -0.8449, -0.8315, -0.8176, -0.8032, -0.7883, -0.7730, -0.7572, -0.7409, -0.7242, -0.7071, -0.6895, -0.6716, -0.6532, -0.6344, -0.6152, -0.5957, -0.5758, -0.5556, -0.5350, -0.5141, -0.4929, -0.4714, -0.4496, -0.4276, -0.4052, -0.3827, -0.3599, -0.3369, -0.3137, -0.2903, -0.2667, -0.2429, -0.2191, -0.1951, -0.1710, -0.1467, -0.1224, -0.0980, -0.0736, -0.0491, -0.0245};
uint32_t sine_index = 0;
while (1)
{
// Set duty cycle of TIM2 to generate sine wave
uint16_t duty_cycle = (sine_table[sine_index] + 1) * 500;
TIM2->CCR1 = duty_cycle;
// Start ADC conversion
ADC_SoftwareStartConv(ADC1);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
// Get ADC value and convert to voltage
uint16_t adc_value = ADC_GetConversionValue(ADC1);
float voltage = adc_value * 3.3 / 4096;
// Increment sine wave index and wrap around at 256
sine_index++;
if (sine_index >= 256)
sine_index = 0;
}
```
在主循环中,我们不断地更新TIM2的占空比来输出正弦波信号,并且在每个周期开始时启动ADC转换。一旦转换完成,我们可以获取ADC值并将其转换为电压值,然后可以对电压值进行进一步处理或显示。
stm32adc采集正弦波
你可以通过使用STM32的模拟到数字转换器(ADC)来采集正弦波信号。下面是一个简单的示例代码,演示如何配置和使用STM32 ADC来采集正弦波信号:
```c
#include "stm32f4xx.h"
// 定义采样频率和周期
#define SAMPLE_FREQ 1000 // 采样频率为1kHz
#define SAMPLE_PERIOD (1.0f / SAMPLE_FREQ) // 采样周期
// 定义ADC配置
#define ADCx ADC1 // 使用的ADC模块
#define ADC_CHANNEL ADC_Channel_0 // 使用的ADC通道
#define ADC_SAMPLETIME ADC_SampleTime_15Cycles // ADC采样时间
// 定义用于存储采样值的数组
#define BUFFER_SIZE 1000 // 存储采样值的数组大小
uint16_t adcBuffer[BUFFER_SIZE]; // 存储采样值的数组
int main(void)
{
// 启用GPIOA和ADC1时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
// 配置GPIOA引脚为模拟输入
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// 配置ADC参数
ADC_InitTypeDef ADC_InitStruct;
ADC_CommonInitTypeDef ADC_CommonInitStruct;
ADC_DeInit();
ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2; // 设置ADC预分频为2,使得ADC时钟为84MHz/2=42MHz
ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStruct);
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b; // 设置ADC分辨率为12位
ADC_InitStruct.ADC_ScanConvMode = DISABLE; // 禁用扫描模式
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE; // 禁用连续转换模式
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; // 禁用外部触发转换
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right; // 数据右对齐
ADC_InitStruct.ADC_NbrOfConversion = 1; // 一次转换一个通道
ADC_Init(ADCx, &ADC_InitStruct);
// 配置ADC通道
ADC_RegularChannelConfig(ADCx, ADC_CHANNEL, 1, ADC_SAMPLETIME);
// 使能ADC
ADC_Cmd(ADCx, ENABLE);
// 延时等待ADC启动
for (int i = 0; i < 10000; i++);
// 清除ADC的标志位
ADC_ClearFlag(ADCx, ADC_FLAG_EOC);
// 开始连续采样
ADC_SoftwareStartConv(ADCx);
// 等待采样结束
while (ADC_GetFlagStatus(ADCx, ADC_FLAG_EOC) == RESET);
// 读取采样值
for (int i = 0; i < BUFFER_SIZE; i++)
{
adcBuffer[i] = ADC_GetConversionValue(ADCx);
}
while (1)
{
// 在这里进行进一步处理或操作采样值
// ...
}
}
```
这个示例代码假设你的正弦波信号被连接到了GPIOA的引脚0上(即PA0)。它使用ADC1模块的通道0来进行采样,并将采样值存储在adcBuffer数组中。你可以根据需要调整采样频率、采样周期、ADC通道等参数。在主循环中,你可以进一步处理或操作采样值。
请注意,这只是一个简单的示例代码,你可能需要根据你的具体需求进行更多的配置和处理。