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先看一眼我的计算过程
ADC配置的是单通道，12位，1.5adc时钟，定时器1触发使用的是同步时钟4分频，ADC时钟为240/4 = 60M,1 ADC_CLK= 16.67ns
定时器1配置的是 TIM = 240/50 = 4.8M,也就是说208ns采一次
加在一起就是 208ns + 8 *16.67 = 208+133.36=341.36ns
也就是说采样率应该是2.92M
然后采集一个信号为10K的正弦波，一个周期的时间为100us
那么一个周期应该会采集到293个点
但是实际！
我使用ADC+DMA,单次采集
采完后将串口打印出来，但是打印出来的波形经过数点数，一个周期只有240个点，那么也就是说明在100us中采集了240个点，1个点所需要的时间为416.67ns,则通过此方法算的采样率为2.399M
与计算的值有不小的误差，萌新卡在这里很久了，求大佬帮帮
串口图
从-663到-420，大约是240个点
定时器配置
ADC配置
RCC配置
时钟树配置
代码 main.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "dac.h"
#include "dma.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "my_uart.h"
#include "stdio.h"
#include "arm_math.h"
#include "arm_const_structs.h"
#define fft_open 0
int n;
__IO uint8_t AdcConvEnd = 0;
uint16_t adc_buff[FFT_LENGTH];
double window[FFT_LENGTH];
float fft_inputbuf[FFT_LENGTH * 2];
float fft_outputbuf[FFT_LENGTH];
unsigned int adc_v;
unsigned int dac_v = 0;
float v;
float FFT_MAX_A = 0;
float FFT_ARR_A = 0.0;
float FFT_MAX_B = -1;
float FFT_ARR_B = 0.0;
int FFT_MAX_NUM_A = 0;
int FFT_MAX_NUM_B = -1;
int FFT_A_FLL = 0;
int FFT_B_FLL = 0;
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
void FFT_GET(void);
void FFT_NUM_GET(void);
void FFT_FUDU_GET(void);
void FFT_FLL_GET(void);
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/*
*/
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint16_t Sine12bit[100]={ 0x0800,0x0881,0x0901,0x0980,0x09FD,0x0A79,0x0AF2,0x0B68,0x0BDA,0x0C49,
0x0CB3,0x0D19,0x0D79,0x0DD4,0x0E29,0x0E78,0x0EC0,0x0F02,0x0F3C,0x0F6F, 0x0F9B,0x0FBF,0x0FDB,0x0FEF,0x0FFB,0x0FFF,0x0FFB,0x0FEF,0x0FDB,0x0FBF,
0x0F9B,0x0F6F,0x0F3C,0x0F02,0x0EC0,0x0E78,0x0E29,0x0DD4,0x0D79,0x0D19,
0x0CB3,0x0C49,0x0BDA,0x0B68,0x0AF2,0x0A79,0x09FD,0x0980,0x0901,0x0881,
0x0800,0x077F,0x06FF,0x0680,0x0603,0x0587,0x050E,0x0498,0x0426,0x03B7, 0x034D,0x02E7,0x0287,0x022C,0x01D7,0x0188,0x0140,0x00FE,0x00C4,0x0091,
0x0065,0x0041,0x0025,0x0011,0x0005,0x0001,0x0005,0x0011,0x0025,0x0041,
0x0065,0x0091,0x00C4,0x00FE,0x0140,0x0188,0x01D7,0x022C,0x0287,0x02E7,
0x034D,0x03B7,0x0426,0x0498,0x050E,0x0587,0x0603,0x0680,0x06FF,0x077F
};
//int Sine12bit[1]={2049};
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART2_UART_Init();
MX_USART3_UART_Init();
MX_USART1_UART_Init();
MX_ADC1_Init();
MX_DAC1_Init();
MX_TIM6_Init();
MX_TIM7_Init();
MX_TIM1_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_IT(&huart1, &USART1_RX_Data, 1);
HAL_UART_Receive_IT(&huart2, &USART2_RX_Data, 1);
HAL_UART_Receive_IT(&huart3, &USART3_RX_Data, 1);
HAL_TIM_Base_Start(&htim1);//4m
HAL_ADCEx_Calibration_Start(&hadc1,ADC_CALIB_OFFSET_LINEARITY,ADC_SINGLE_ENDED);//1/5m+8adc_clk = 200+8*16=333.6ns,鏈?0.3ns璇樊
HAL_ADC_Start_DMA(&hadc1, (uint32_t *)adc_buff, FFT_LENGTH);//ADC鏃堕挓涓?60M(鏈夊湴鏂规彁鍙婃渶澶т负38M),1ADC_CLK = 16.7ns
// HAL_TIM_Base_Start(&htim7);
// HAL_DAC_Start_DMA(&hdac1,DAC_CHANNEL_1,(uint32_t*)adc_buff,FFT_LENGTH,DAC_ALIGN_12B_R);
FFT_GET();
FFT_NUM_GET();
FFT_FUDU_GET();
FFT_FLL_GET();
//#endif
for (int i = 0; i < FFT_LENGTH; i++)//
{
printf("%.3f\n", adc_buff * 3.3 / 4095);
}
printf("fft_max_A =%f,num=%d,flz = %d,fft_max_B =%f,num=%d,flz = %d\r\n",FFT_MAX_A, FFT_MAX_NUM_A,FFT_A_FLL,FFT_MAX_B, FFT_MAX_NUM_B,FFT_B_FLL);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Supply configuration update enable
*/
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
__HAL_RCC_SYSCFG_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 5;
RCC_OscInitStruct.PLL.PLLN = 192;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 3;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
void FFT_GET(void)
{
while (!AdcConvEnd)
;//绛夊緟鏁版嵁鍙戝畬
for (int i = 0; i < FFT_LENGTH; i++)
{
fft_inputbuf[i * 2] = adc_buff * 3.3 / 4096;//ADC
fft_inputbuf[i * 2 + 1] = 0;//
}
arm_cfft_f32(&arm_cfft_sR_f32_len1024, fft_inputbuf, 0, 1);
arm_cmplx_mag_f32(fft_inputbuf, fft_outputbuf, FFT_LENGTH);
fft_outputbuf[0] /= 1024;
for (int i = 1; i < FFT_LENGTH; i++)
{
fft_outputbuf /= 512;
}
// for (int i = 0; i < FFT_LENGTH; i++)
// {
// // printf("%d:\t%.2f\r\n", i, fft_outputbuf);
// }
}
void FFT_NUM_GET(void)
{
for (int i = 1; i < FFT_LENGTH/2; i++)//
{
if (FFT_MAX_A < fft_outputbuf)
{
FFT_MAX_B = FFT_MAX_A; //
FFT_MAX_NUM_B = FFT_MAX_NUM_A; //
FFT_MAX_A = fft_outputbuf; //
FFT_MAX_NUM_A = i; //
}
else if (fft_outputbuf > FFT_MAX_B) //
{
FFT_MAX_B = fft_outputbuf; //
FFT_MAX_NUM_B = i; //
}
}
}
void FFT_FUDU_GET(void)
{
int FFT_STOP_S_A=0;
int FFT_STOP_X_A=0;
int FFT_STOP_S_B=0;
int FFT_STOP_X_B=0;
if(FFT_MAX_A !=0)//
{
for (int i = -20; i < 20; i++)
{
if(FFT_MAX_NUM_A+i>0&&FFT_MAX_NUM_A+i!=FFT_MAX_NUM_B)
{
if(i<0)//
{
if(fft_outputbuf[FFT_MAX_NUM_A+i]<=fft_outputbuf[FFT_MAX_NUM_A+i+1])
{
if(FFT_STOP_S_A == 0)
{
FFT_ARR_A = FFT_ARR_A+fft_outputbuf[FFT_MAX_NUM_A+i]*fft_outputbuf[FFT_MAX_NUM_A+i];
}
}
else
{
FFT_STOP_S_A = 1;
}
}
if(i>=0)//
{
if(fft_outputbuf[FFT_MAX_NUM_A+i]>=fft_outputbuf[FFT_MAX_NUM_A+i+1])
{
if(FFT_STOP_X_A==0)
{
FFT_ARR_A = FFT_ARR_A+fft_outputbuf[FFT_MAX_NUM_A+i]*fft_outputbuf[FFT_MAX_NUM_A+i];
}
}
else
{
FFT_STOP_X_A = 1;
}
}
}
}
FFT_MAX_A = sqrt(FFT_ARR_A) ;
}
if(FFT_MAX_B !=0)
{
for (int i = -20; i < 20; i++)
{
if(FFT_MAX_NUM_B+i>0&&FFT_MAX_NUM_B+i!=FFT_MAX_NUM_A)
{
if(i<0)//
{
if(fft_outputbuf[FFT_MAX_NUM_B+i]<=fft_outputbuf[FFT_MAX_NUM_B+i+1])
{
if(FFT_STOP_S_B == 0)
{
FFT_ARR_B = FFT_ARR_B+fft_outputbuf[FFT_MAX_NUM_B+i]*fft_outputbuf[FFT_MAX_NUM_B+i];
}
}
else
{
FFT_STOP_S_B = 1;
}
}
if(i>=0)//
{
if(fft_outputbuf[FFT_MAX_NUM_B+i]>=fft_outputbuf[FFT_MAX_NUM_B+i+1])
{
if(FFT_STOP_X_B==0)
{
FFT_ARR_B = FFT_ARR_B+fft_outputbuf[FFT_MAX_NUM_B+i]*fft_outputbuf[FFT_MAX_NUM_B+i];
}
}
else
{
FFT_STOP_X_B = 1;
}
}
}
}
FFT_MAX_B = sqrt(FFT_ARR_B) ;
}
}
void FFT_FLL_GET(void)
{
if(FFT_MAX_NUM_A>20)
{
FFT_A_FLL = FFT_MAX_NUM_A*2.44;
}
else
FFT_A_FLL = FFT_MAX_NUM_A*2.50;
if(FFT_MAX_NUM_B>20)
{
FFT_B_FLL = FFT_MAX_NUM_B*2.44;
}
else
FFT_B_FLL = FFT_MAX_NUM_B*2.50;
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
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发表于 2024-7-22 06:38:48
楼主
发表于 2024-7-22 08:53:40
