Question
ADC SampleRate
I wonder why I have data in the buffer when my sample rate is 30KHz and 0 when the sample rate is 50KHz.
My code:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2025 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 "spi.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
//#include "AD9833.h"
// #include "Key.h"
// #include "LCD.h"
// #include "LowPowerCtrl.h"
// // #include "stm32f4xx_hal_rcc.h"
// #include "SignalGenerator.h"
// #include "SignalSampling.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* 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 */
#define ADC1_TRIGGER htim3
uint8_t ADC1_CompleteFlag = 0; // ADC1转换完成标志位
uint8_t ADC2_CompleteFlag = 0; // ADC2转换完成标志位
#define ADC_TIM_Clock 84e6 // 定时器时钟频率
#define ADC_BUFFER_SIZE 1024 // 假设采2048组数据（FFT一般要2的幂次）
#define ADC_SampleRate 30e3
uint32_t adc_buffer[ADC_BUFFER_SIZE]; // 注意是uint32_t，因为双ADC打包成32位
uint16_t adc_buffer1[ADC_BUFFER_SIZE];
uint16_t adc_buffer2[ADC_BUFFER_SIZE];
void ADC_SetSampleRate(TIM_HandleTypeDef *htim, float sample_rate)
{
uint32_t Timer_Clock = ADC_TIM_Clock / (htim->Instance->PSC + 1);
uint32_t timer_reload_value = (uint32_t)(Timer_Clock / sample_rate) - 1;
if (timer_reload_value < 1) timer_reload_value = 1;
HAL_TIM_Base_Stop(htim); // 安全：暂停 TIM
__HAL_TIM_SET_AUTORELOAD(htim, timer_reload_value);
__HAL_TIM_SET_COUNTER(htim, 0); // 重置计数器
HAL_TIM_Base_Start(htim); // 重新启动 TIM
USART_Printf(&huart1, "ADC TimerClock=%lu, ARR=%lu, SampleRate=%.1f Hz\r\n",
Timer_Clock, timer_reload_value, sample_rate);
}
/* 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 */
/* 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_SPI1_Init();
MX_USART1_UART_Init();
MX_TIM2_Init();
MX_TIM1_Init();
MX_ADC1_Init();
MX_ADC2_Init();
MX_DAC_Init();
MX_TIM3_Init();
MX_TIM4_Init();
MX_TIM5_Init();
MX_TIM6_Init();
/* USER CODE BEGIN 2 */
ADC_SetSampleRate(&ADC1_TRIGGER,ADC_SampleRate);
HAL_ADC_Start(&hadc2);
HAL_ADCEx_MultiModeStart_DMA(&hadc1,adc_buffer,ADC_BUFFER_SIZE);
HAL_TIM_Base_Start(&ADC1_TRIGGER);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if(ADC1_CompleteFlag == 1)
{
for(uint16_t i = 0 ; i< ADC_BUFFER_SIZE ; i++)
{
adc_buffer1[i] = (adc_buffer[i] & 0x0000FFFF);
adc_buffer2[i] = (adc_buffer[i] & 0xFFFF0000) >> 16;
// USART_Printf(&huart1,"%d,%d,%d\n",adc_buffer[i],adc_buffer1[i],adc_buffer2[i]);
// USART_Printf(&huart1,"%d,%d\n",adc_buffer1[i],adc_buffer2[i]);
//USART_Printf(&huart1,"%d\n",adc_buffer2[i]);
}
ADC1_CompleteFlag = 0;
}
// Key_Process();
// HAL_Delay(10);
/* 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};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** 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 = 4;
RCC_OscInitStruct.PLL.PLLN = 168;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
Error_Handler();
}
/** Enables the Clock Security System
*/
HAL_RCC_EnableCSS();
}
/* USER CODE BEGIN 4 */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
if(hadc == &hadc1)
{
HAL_TIM_Base_Stop(&ADC1_TRIGGER);
// USART_Printf(&huart1,"ADC Complete!\n");
ADC1_CompleteFlag = 1; //
}
}
// void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
// {
// if(htim == &ADC1_TRIGGER)
// {
// // USART_Printf(&huart1, "ADC_Timer Interrupt\n");
// }
// if(htim == &htim5)
// {
// }
// if(htim == &htim6)
// {
// }
// }
// while(HAL_GPIO_ReadPin(WKUP_GPIO_Port,WKUP_Pin) == GPIO_PIN_SET);
// if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB))
// {
// USART_Printf(&huart1,"IF:SB:%d WU:%d\n",__HAL_PWR_GET_FLAG(PWR_FLAG_SB),__HAL_PWR_GET_FLAG(PWR_FLAG_WU));
// __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB); //
// __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU); //
// }
// HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
// USART_Printf(&huart1,"SB:%d WU:%d\n",__HAL_PWR_GET_FLAG(PWR_FLAG_SB),__HAL_PWR_GET_FLAG(PWR_FLAG_WU));
// define:
// #define ADC_BUFFER_SIZE 1024 // 假设采2048组数据（FFT一般要2的幂次）
// uint32_t adc_buffer[ADC_BUFFER_SIZE]; // 注意是uint32_t，因为双ADC打包成32位
// uint16_t adc_buffer1[ADC_BUFFER_SIZE];
// uint16_t adc_buffer2[ADC_BUFFER_SIZE];
// #define ADC1_TRIGGER htim3
// #define ADC_TIM_Clock 84e6
// #define ADC_SampleRate 10e3
// void ADC_SetSampleRate(TIM_HandleTypeDef *htim, float sample_rate)
// {
// uint32_t Timer_Clock = ADC_TIM_Clock / (htim->Instance->PSC + 1);
// uint32_t timer_reload_value = (uint32_t)(Timer_Clock / sample_rate) - 1;
// if (timer_reload_value < 1) timer_reload_value = 1;
// HAL_TIM_Base_Stop(htim); // 安全：暂停 TIM
// __HAL_TIM_SET_AUTORELOAD(htim, timer_reload_value);
// __HAL_TIM_SET_COUNTER(htim, 0); // 重置计数器
// HAL_TIM_Base_Start(htim); // 重新启动 TIM
// USART_Printf(&huart1, "ADC TimerClock=%lu, ARR=%lu, SampleRate=%.1f Hz\r\n",
// Timer_Clock, timer_reload_value, sample_rate);
// }
// // int main()
// ADC_SetSampleRate(&ADC1_TRIGGER,ADC_SampleRate);
// HAL_ADC_Start(&hadc2);
// HAL_ADCEx_MultiModeStart_DMA(&hadc1,adc_buffer,ADC_BUFFER_SIZE);
// HAL_TIM_Base_Start(&ADC1_TRIGGER);
// while (1)
// {
// if(ADC1_CompleteFlag == 1)
// {
// for(uint16_t i = 0 ; i< ADC_BUFFER_SIZE ; i++)
// {
// adc_buffer1[i] = (adc_buffer[i] & 0x0000FFFF);
// adc_buffer2[i] = (adc_buffer[i] & 0xFFFF0000) >> 16;
// //USART_Printf(&huart1,"%d,%d,%d\n",adc_buffer[i],adc_buffer1[i],adc_buffer2[i]);
// //USART_Printf(&huart1,"%d,%d\n",adc_buffer1[i],adc_buffer2[i]);
// USART_Printf(&huart1,"%d\n",adc_buffer2[i]);
// }
// ADC1_CompleteFlag = 0;
// }
// }
// void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
// {
// if(hadc == &hadc1)
// {
// ADC1_CompleteFlag = 1; // 设置ADC1转换完成标志位
// }
// }
// ADC TimerClock=84000000, ARR=8399, SampleRate=10000.0 Hz
// ADC TimerClock=84000000, ARR=2099, SampleRate=40000.0 Hz
// ADC TimerClock=84000000, ARR=1679, SampleRate=50000.0 Hz
// 为什么采样率设置为50K时，主循环没有打印串口数据,DMA是normal模式,排除串口速度跟不上
/* 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 */
ADC:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file adc.c
* @brief This file provides code for the configuration
* of the ADC instances.
******************************************************************************
* @attention
*
* Copyright (c) 2025 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 "adc.h"
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
ADC_HandleTypeDef hadc1;
ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc1;
/* ADC1 init function */
void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */
ADC_MultiModeTypeDef multimode = {0};
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC1_Init 1 */
/* USER CODE END ADC1_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = DISABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DMAContinuousRequests = ENABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure the ADC multi-mode
*/
multimode.Mode = ADC_DUALMODE_REGSIMULT;
multimode.DMAAccessMode = ADC_DMAACCESSMODE_2;
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES;
if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */
/* USER CODE END ADC1_Init 2 */
}
/* ADC2 init function */
void MX_ADC2_Init(void)
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.ScanConvMode = DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_9;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(adcHandle->Instance==ADC1)
{
/* USER CODE BEGIN ADC1_MspInit 0 */
/* USER CODE END ADC1_MspInit 0 */
/* ADC1 clock enable */
__HAL_RCC_ADC1_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**ADC1 GPIO Configuration
PB0 ------> ADC1_IN8
*/
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* ADC1 DMA Init */
/* ADC1 Init */
hdma_adc1.Instance = DMA2_Stream0;
hdma_adc1.Init.Channel = DMA_CHANNEL_0;
hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc1.Init.Mode = DMA_NORMAL;
hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);
/* USER CODE BEGIN ADC1_MspInit 1 */
/* USER CODE END ADC1_MspInit 1 */
}
else if(adcHandle->Instance==ADC2)
{
/* USER CODE BEGIN ADC2_MspInit 0 */
/* USER CODE END ADC2_MspInit 0 */
/* ADC2 clock enable */
__HAL_RCC_ADC2_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**ADC2 GPIO Configuration
PB1 ------> ADC2_IN9
*/
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN ADC2_MspInit 1 */
/* USER CODE END ADC2_MspInit 1 */
}
}
void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
{
if(adcHandle->Instance==ADC1)
{
/* USER CODE BEGIN ADC1_MspDeInit 0 */
/* USER CODE END ADC1_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_ADC1_CLK_DISABLE();
/**ADC1 GPIO Configuration
PB0 ------> ADC1_IN8
*/
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_0);
/* ADC1 DMA DeInit */
HAL_DMA_DeInit(adcHandle->DMA_Handle);
/* USER CODE BEGIN ADC1_MspDeInit 1 */
/* USER CODE END ADC1_MspDeInit 1 */
}
else if(adcHandle->Instance==ADC2)
{
/* USER CODE BEGIN ADC2_MspDeInit 0 */
/* USER CODE END ADC2_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_ADC2_CLK_DISABLE();
/**ADC2 GPIO Configuration
PB1 ------> ADC2_IN9
*/
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_1);
/* USER CODE BEGIN ADC2_MspDeInit 1 */
/* USER CODE END ADC2_MspDeInit 1 */
}
}
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */