W moim układzie nie ma dwóch kanałów DMA, przez co tylko ADC moje być obsłużony przez DMA. Ale nic straconego – od czego są wątki w systemach Realtime.

Przewody i MX

Podłączamy dwa urządzenia z wyjściem AO (w moim przypadku czujnik dźwięku i żyroskop), odpowiednio do złącz AO i A1 w STM32.

Konfigurujemy piny (u mnie to PA0 -> ADC1_IN0, PA1 ->ADC2_IN1). Z założenia chcemy obsłużyć OBA przetworniki naraz.

ADC1 konfigurujemy jak w poprzednim przykładzie (DMA itp.), natomiast ADC2 nie posiada opcji DMA, zostawiamy ustawienia domyślne (IN1 checkbox).

Dwa wątki

Napiszemy dwa wątki do symulacji mechanizmu DMA, pierwszy będzie wypełniał bufor (adc2_buf) w odstępach 1ms [0-1023]. W połowie pracy ustawiana jest odpowiednia flaga na 1 i wtedy drugi wątek przystępuje do analizy zapisanych danych. Na koniec pracy ustawia flagę na 0, stąd pierwszy wątek wie, że znowu można pisać w 1szej części tablicy [0-512]. Analogicznie potraktowana jest druga połowa tablicy. Dlatego jak pierwszy wątek pisze na początku, to drugi działa w drugiej połowie i na odwrót.

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/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
*

<center>© Copyright (c) 2020 STMicroelectronics.
* All rights reserved.</center>*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
//FX Real Time Thread OS:
#include "rtthread.h"
#include "rthw.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define ADC_BUF_LEN 4096
#define ADC2_BUF_LEN 1024
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc1;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */
//FX:
uint16_t adc_buf[ADC_BUF_LEN]; //ADC DMA BUF
uint16_t adc2_buf[ADC2_BUF_LEN];//max:2048
uint32_t counter1kHz = 0;

extern int rtthread_startup(void);
void rt_hw_console_output(const char *str)
{
HAL_UART_Transmit(&huart2, (uint8_t*)str, rt_strlen(str), 1000);
if(str[ rt_strlen(str) - 1 ] == '\n')
{
char back_r[2];
rt_strncpy(back_r, "\r", 1);
HAL_UART_Transmit(&huart2, (uint8_t*)back_r, rt_strlen(back_r), 1000);
}
}

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_ADC1_Init(void);
static void MX_ADC2_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
//FX:
rt_thread_t write_buffer_thread;
rt_thread_t process_buffer_thread;
volatile uint8_t adc2_half_buffer = 0, adc2_full_buffer = 0; //if adc2 buffer is half full

void write_buffer_thread_entry(void* parameter)
{ //thread1 - ADC2 conversion
HAL_ADC_Start(&hadc2);
int adc2_i=0;
while(1){
if(HAL_ADC_PollForConversion(&hadc2,10) == HAL_OK) //timeout:10
{
while ((adc2_i < ADC2_BUF_LEN/2 && adc2_half_buffer) || (adc2_i >= ADC2_BUF_LEN/2 && adc2_full_buffer)) //wait for 2 thread to finish the job of processing buffers
{
rt_kprintf("-FULL BUFFER -");
rt_thread_delay(1);
}
adc2_buf[adc2_i++] = HAL_ADC_GetValue(&hadc2); //read next value from ADC
if (adc2_i == ADC2_BUF_LEN) //end of buffer
{

adc2_i = 0;
adc2_full_buffer = 1; //set FLAG - FULL BUFFER for thread2
}
else
if (adc2_i == ADC2_BUF_LEN/2) //0-511 (now is 512 but not read yet)
{
adc2_half_buffer = 1;
}
HAL_ADC_Start(&hadc2);
rt_thread_mdelay(1);
}//if HALADC
}//while
}

void process_buffer_thread_entry(void* parameter)
{ //watek 2
while(1){
if (adc2_full_buffer) //512-1023
{
for (int i= (ADC2_BUF_LEN >> 1); i<ADC2_BUF_LEN; i++) { //process half buffer 512->1023
if (adc2_buf[i] > 0 && adc2_buf[i] < 3800)
rt_kprintf("%i/",adc2_buf[i]);
}
adc2_full_buffer = 0; //processed - flag change
}
else
if (adc2_half_buffer)//0-511
{
for (int i=0 ; i<(ADC2_BUF_LEN >> 1); i++)
{ //process half buffer 0->512
if (adc2_buf[i] > 0 && adc2_buf[i] < 3800)
rt_kprintf("%i/",adc2_buf[i]);
}
adc2_half_buffer = 0; //processed - flag change
}
rt_thread_mdelay(100); //musi byc przerwa w obsludze 2 watku
}
}

void run_2_threads(void)
{ //Uruchamia oba watki
write_buffer_thread = rt_thread_create(
"writeBuffer",
write_buffer_thread_entry,
RT_NULL,
512,
3,
20
);
if(write_buffer_thread != RT_NULL)
rt_thread_startup(write_buffer_thread);

process_buffer_thread = rt_thread_create(
"processBuffer",
process_buffer_thread_entry,
RT_NULL,
512,
3,
20
);
if(process_buffer_thread != RT_NULL) /* ???????,????? */
rt_thread_startup(process_buffer_thread);

}

/* 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_ADC1_Init();
MX_ADC2_Init();
/* USER CODE BEGIN 2 */

run_2_threads(); //run ADC2 threads

/* show RT-Thread version UART2 console */
rt_kprintf("\n\rLOADING...\n");
rt_show_version();

HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_buf, ADC_BUF_LEN);

/* USER CODE END 2 */

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
rt_thread_delay(1);
/* 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};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

/** 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.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
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_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV2;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}

/**
* @brief ADC1 Initialization Function
* @param None
* @retval None
*/

static void MX_ADC1_Init(void)
{

/* USER CODE BEGIN ADC1_Init 0 */

/* USER CODE END ADC1_Init 0 */

ADC_ChannelConfTypeDef sConfig = {0};

/* USER CODE BEGIN ADC1_Init 1 */

/* USER CODE END ADC1_Init 1 */
/** Common config
*/

hadc1.Instance = ADC1;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/

sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */

/* USER CODE END ADC1_Init 2 */

}

/**
* @brief ADC2 Initialization Function
* @param None
* @retval None
*/

static 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 */
/** Common config
*/

hadc2.Instance = ADC2;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE; //?
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.NbrOfConversion = 1;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/

sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */

/* USER CODE END ADC2_Init 2 */

}

/**
* @brief USART2 Initialization Function
* @param None
* @retval None
*/

static void MX_USART2_UART_Init(void)
{

/* USER CODE BEGIN USART2_Init 0 */

/* USER CODE END USART2_Init 0 */

/* USER CODE BEGIN USART2_Init 1 */

/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */

/* USER CODE END USART2_Init 2 */

}

/**
* Enable DMA controller clock
*/

static void MX_DMA_Init(void)
{

/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();

/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}

/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/

static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};

/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();

/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);

/*Configure GPIO pin : B1_Pin */
GPIO_InitStruct.Pin = B1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);

/*Configure GPIO pin : LD2_Pin */
GPIO_InitStruct.Pin = LD2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);

/* EXTI interrupt init*/
HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);

}

/* USER CODE BEGIN 4 */
//FX:

void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc) {
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_SET);
uint32_t sum=0;
uint16_t cycles=0;
for (int i=0; i<2048; i++) sum += adc_buf[i]; sum >>= 11; // /= 2048; //srednia + dc
sum += 20; //DC
for (int i=0; i<2047; i++)
{
if(adc_buf[i] < sum && adc_buf[i+1] >= sum)
cycles++;
}
if (cycles > 0)
rt_kprintf("%lu,", cycles);
}

uint32_t prevClock = 0;
// Called when buffer is completely filled
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) {
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
uint32_t sum=0;
uint16_t cycles=0;
for (int i=0; i<2048; i++) sum += adc_buf[i]; sum >>=11; // 2048; //srednia + dc
sum += 20; //DC
for (int i=0; i<2047; i++)
{
if(adc_buf[i] < sum && adc_buf[i+1] >= sum)
cycles++;
}
if (cycles > 0)
rt_kprintf("%lu,", cycles);
}

void HAL_SYSTICK_Callback(){
//Clock system callback 1kHz
counter1kHz++;
}
/* 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 */

/* 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,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */