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MİKRODENETLEYİCİLER => ARM => Konuyu başlatan: astum - 16 Nisan 2018, 14:01:48

Başlık: STM32F4 PWM ile üretilen sinyalin USART aracılığıyla MATLAB çizdirme problemi
Gönderen: astum - 16 Nisan 2018, 14:01:48
Merhaba,

STM32F407 Discovery kitini kullanarak, Projemde; PWM modülü ile üretilen 100 hz kare dalga sinyalini 1ms'lik aralıklarla ADC -DMA ile okuyup USART2 üzerinden MATLAB'de çizdiriyorum. Fakat PWM sinyal frekansı 1Khz olduğunda problemler yaşıyorum. Bu noktada yardım ve tavsiyelerinizi rica ediyorum.

STM32F kaynak kodu aşağıdaki gibidir. 100 hz kare dalga üretilip ADC-DMA modülünde 1 ms'lik aralıklarla okunmasına göre tasarlanmıştır.

(Not: 1kHz kare dalga üretilirken de aynı kod kullanılmaktadır. Sadece htim3.Init.Prescaler = 19; htim8.Init.Prescaler = 3; satırları değiştirilerek 1 KHz kare dalga sinyali elde edilmektedir.)

#include "stdio.h"
#include "main.h"
#include "stm32f4xx_hal.h"
#include "arm_math.h"
#include "math_helper.h"

int16_t adc_data1[2]={0};
int16_t pot=0;

ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim8;

UART_HandleTypeDef huart2;

int __io_putchar(int ch)
{
 uint8_t c[1];
 c[0] = ch & 0x00FF;
 HAL_UART_Transmit(&huart2, &*c, 1, 100);
 return ch;
}

int _write(int file,char *ptr, int len)
{
 int DataIdx;
 for(DataIdx= 0; DataIdx< len; DataIdx++)
 {
 __io_putchar(*ptr++);
 }
return len;
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
 if (htim->Instance == TIM8)
 {
 pot = adc_data1[1];
    printf("%d\n", pot);
 }
}

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_TIM3_Init(void);
static void MX_TIM8_Init(void);
                                   
void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
                               

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART2_UART_Init();
  MX_ADC1_Init();
  MX_TIM3_Init();
  MX_TIM8_Init();

  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);
  htim3.Instance->CCR1 =1799;// Duty cycle = X(18000) / TIM.Period, DT=%50

  HAL_TIM_Base_Start_IT(&htim8);
  HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_data1, 2);

  while (1)
  {

  }

}

void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Configure the main internal regulator output voltage
    */
  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    /**Initializes the CPU, AHB and APB busses clocks
    */
  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 = 144;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Initializes the CPU, AHB and APB busses 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_4) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure the Systick interrupt time
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/* ADC1 init function */
static void MX_ADC1_Init(void)
{

  ADC_ChannelConfTypeDef sConfig;

    /**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_DIV2;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = ENABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T8_TRGO;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 2;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
    */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
    */
  sConfig.Channel = ADC_CHANNEL_5;
  sConfig.Rank = 2;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

}

/* TIM3 init function */
static void MX_TIM3_Init(void)
{

  TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;

  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 199;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 3599;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  HAL_TIM_MspPostInit(&htim3);

}

static void MX_TIM8_Init(void)
{

  TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;

  htim8.Instance = TIM8;
  htim8.Init.Prescaler = 39;
  htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim8.Init.Period = 3599;
  htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim8.Init.RepetitionCounter = 0;
  if (HAL_TIM_Base_Init(&htim8) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

}

/* USART2 init function */
static void MX_USART2_UART_Init(void)
{

  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(__FILE__, __LINE__);
  }

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{
  /* DMA controller clock enable */
  __HAL_RCC_DMA2_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA2_Stream0_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);

}

/** Configure pins as
        * Analog
        * Input
        * Output
        * EVENT_OUT
        * EXTI
*/
static void MX_GPIO_Init(void)
{

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  file: The file name as string.
  * @param  line: The line in file as a number.
  * @retval None
  */
void _Error_Handler(char *file, int line)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  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,
    tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/**
  * @}
  */


Aşağıda mcu'da 100hz kare dalga üretilen sinyalin USART2 ile MATLAB'a aktarılmış şekli gösterilmektedir. Sinyal periyodunda herhangi bir bozulma görülmemektedir. X eksenindeki her aralık :0,001 sn olarak hesaplanmaktadır.

(https://drive.google.com/file/d/1iin64Gz0Qo_ira7rjT7W6Hutkc-s8M1y/view)
https://drive.google.com/file/d/1iin64Gz0Qo_ira7rjT7W6Hutkc-s8M1y/view (https://drive.google.com/file/d/1iin64Gz0Qo_ira7rjT7W6Hutkc-s8M1y/view)

Grafiği çizdirmek için yazılan MATLAB kodu aşağıdaki gibidir.
(Not:1kHz sinyal çizdirilirken yandaki satır değiştirilmiştir >> pause(.0001); %ADC okuma periyodu)

clc;
clear all;
data = serial('/dev/ttyUSB5','BaudRate',115200);
fopen(data);

x=0;

while(x<100)
    x=x+1; 
    y1(x)=fscanf(data, '%d');       
   
    %axisX = linspace(0, ,100);
    plot(y1,'r--','linewidth',3);
   
    grid on;
    pause(.001); %ADC okuma periyodu
    drawnow   
end

fclose(data);
%delete(data)


Üretilen kare dalga sinyali 500hz üzerine çıktığında problem yaşıyorum. 1Khz kare dalga sinyalini okurken elde edilen MATLAB çıktısı aşağıda gösterilmiştir. Kare dalga sinyalinin periyodu bozulmuştur. X eksenindeki her aralık :0,0001 sn olarak hesaplanmaktadır.

(https://drive.google.com/file/d/1Gdh1Sh-iJPTO14FaxHoYg3xo4EVsG8-H/view?usp=sharing)
https://drive.google.com/file/d/1Gdh1Sh-iJPTO14FaxHoYg3xo4EVsG8-H/view (https://drive.google.com/file/d/1Gdh1Sh-iJPTO14FaxHoYg3xo4EVsG8-H/view)

STM32CubeMX programı kullanarak kod üretilmiştir. Aşağıda CubeMX konfigürasyon ayarları gösterilmiştir.

STM32F407'nin kullanılan çevresel birimleri ve mcu pinleri aşağıdaki gibidir.

(https://drive.google.com/file/d/1J2PPVziQoioxEy2YT1Y-yqBAo25XIKCZ/view?usp=sharing)
https://drive.google.com/file/d/1J2PPVziQoioxEy2YT1Y-yqBAo25XIKCZ/view (https://drive.google.com/file/d/1J2PPVziQoioxEy2YT1Y-yqBAo25XIKCZ/view)

STM32F 144 MHz clock değerine ayarlanmıştır. TIM8 ve ADC1'in bağlı olduğu APB2 çevresel birimi clock değeri: 72 MHz, timer clock değeri: 144 MHz. TIM3'ün bağlı olduğu APB1 çevresel birimi timer clock değeri: 72MHz.

(https://drive.google.com/file/d/1kFwqD0j1ZKKj2Re2kgucjxifo_IPxN5_/view?usp=sharing)
https://drive.google.com/file/d/1kFwqD0j1ZKKj2Re2kgucjxifo_IPxN5_/view (https://drive.google.com/file/d/1kFwqD0j1ZKKj2Re2kgucjxifo_IPxN5_/view)

STM32F4 ADC1 konfigürasyon değerleri aşağıda gösterilmiştir.

(https://drive.google.com/file/d/17wNTfRzW8n-DjNkArWpUUetGhwRa9xud/view?usp=sharing)
https://drive.google.com/file/d/17wNTfRzW8n-DjNkArWpUUetGhwRa9xud/view (https://drive.google.com/file/d/17wNTfRzW8n-DjNkArWpUUetGhwRa9xud/view)

STM32F4 USART2 konfigürasyon değerleri aşağıda gösterilmiştir.

(https://drive.google.com/file/d/1WnGhFiY43RxXTBw23EWEvyut5i-OejG4/view?usp=sharing)
https://drive.google.com/file/d/1WnGhFiY43RxXTBw23EWEvyut5i-OejG4/view (https://drive.google.com/file/d/1WnGhFiY43RxXTBw23EWEvyut5i-OejG4/view)