STM32三麦克风求平面声源坐标代码
时间: 2023-07-23 18:15:00 浏览: 64
以下是一个基本的STM32三麦克风求平面声源坐标的代码示例,仅供参考:
```c
#include "stm32f4xx.h"
#include "arm_math.h"
#define MIC_NUM 3
#define SPEED_OF_SOUND 340
#define PI 3.1415926f
float mic_pos[MIC_NUM][2] = {{0, 0}, {0, 1}, {1, 0}}; // 三个麦克风的坐标
float mic_dist[MIC_NUM] = {0}; // 三个麦克风到声源的距离差
float position[2] = {0}; // 平面声源的坐标
// 获取ADC采样值
uint16_t get_adc_value(void)
{
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_56Cycles);
ADC_SoftwareStartConv(ADC1);
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
return ADC_GetConversionValue(ADC1);
}
// 获取ADC采样值的平均值
float get_adc_average(void)
{
float sum = 0;
uint16_t adc_value = 0;
for(int i = 0; i < 10; i++)
{
adc_value = get_adc_value();
sum += adc_value;
}
return sum / 10.0f;
}
// 获取声波信号的到达时间差
float get_time_diff(uint16_t mic1, uint16_t mic2)
{
float adc1 = get_adc_average();
float adc2 = get_adc_average();
float time_diff = (adc2 - adc1) / 44100.0f; // 采样率为44100Hz
return time_diff;
}
// 计算声源到三个麦克风的距离差
void calc_dist_diff(void)
{
for(int i = 0; i < MIC_NUM; i++)
{
for(int j = i + 1; j < MIC_NUM; j++)
{
float time_diff = get_time_diff(i, j);
mic_dist[i] += time_diff * SPEED_OF_SOUND;
mic_dist[j] -= time_diff * SPEED_OF_SOUND;
}
}
}
// 求解平面声源的坐标
void calc_position(void)
{
float A[2][2], B[2], X[2];
for(int i = 0; i < MIC_NUM; i++)
{
A[i][0] = mic_pos[i][0] - mic_pos[0][0];
A[i][1] = mic_pos[i][1] - mic_pos[0][1];
B[i] = mic_dist[0] * mic_dist[0] - mic_dist[i] * mic_dist[i] - mic_pos[i][0] * mic_pos[i][0] - mic_pos[i][1] * mic_pos[i][1] + mic_pos[0][0] * mic_pos[0][0] + mic_pos[0][1] * mic_pos[0][1];
}
arm_matrix_instance_f32 matA = {2, 2, (float32_t *)A};
arm_matrix_instance_f32 matB = {2, 1, (float32_t *)B};
arm_matrix_instance_f32 matX = {2, 1, (float32_t *)X};
arm_matrix_instance_f32 matAi = {2, 2, NULL};
arm_mat_inverse(&matA, &matAi);
arm_mat_mult_f32(&matAi, &matB, &matX);
position[0] = matX.pData[0];
position[1] = matX.pData[1];
}
int main(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
GPIO_InitTypeDef gpio_init;
gpio_init.GPIO_Mode = GPIO_Mode_AN;
gpio_init.GPIO_Pin = GPIO_Pin_0;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &gpio_init);
ADC_InitTypeDef adc_init;
adc_init.ADC_ContinuousConvMode = DISABLE;
adc_init.ADC_DataAlign = ADC_DataAlign_Right;
adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
adc_init.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
adc_init.ADC_NbrOfConversion = 1;
adc_init.ADC_Resolution = ADC_Resolution_12b;
adc_init.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1, &adc_init);
ADC_Cmd(ADC1, ENABLE);
while(1)
{
calc_dist_diff();
calc_position();
}
}
```
以上代码仅为示例,实际实现中需要根据具体的硬件平台和实际需求进行修改和优化。