Plotting data from adc in matlab

code is below. How can I plot the dene[i] in code in matlab?

#include <stm32f4xx.h>

#include <stm32f4xx_conf.h>

#include <stm32f4xx_rcc.h>

#include <stm32f4xx_adc.h>

#include <stm32f4xx_gpio.h>

ADC_InitTypeDef ADC_init_structure; //Structure for adc confguration

GPIO_InitTypeDef alper; //Structure for analog input pin

int i;

static char dene1[2048];

static char dene2[2048];

static char dene3[2048];

static char dene4[2048];

static char dene5[1808];

float dum1;

int ms10Ticks; /* counts 1ms timeTicks */

/*----------------------------------------------------------------------------

SysTick_Handler

*----------------------------------------------------------------------------*/

void SysTick_Handler(void) {

ms10Ticks++;

ADC_SoftwareStartConv(ADC1);//ADC1->CR2 |= (1<<30);

}

/*----------------------------------------------------------------------------

MAIN function

*----------------------------------------------------------------------------*/

int main (void) {

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

GPIO_StructInit(&alper);

alper.GPIO_Pin = GPIO_Pin_5;//The channel 15 is connected to PC5

alper.GPIO_Mode = GPIO_Mode_AN; //The PC5 pin is configured in analog mode

alper.GPIO_PuPd = GPIO_PuPd_NOPULL; //We don't need any pull up or pull down

GPIO_Init(GPIOC,&alper);//Affecting the port with the initialization structure configuration

//GPIOC->MODER |= (3<<10); // PC5--> ADC.15 input olarak ayarla

//GPIOC->PUPDR = 0x00000000; // pull up-down yok

ADC_DeInit();

ADC_init_structure.ADC_DataAlign = ADC_DataAlign_Right;//data converted will be shifted to right

ADC_init_structure.ADC_Resolution = ADC_Resolution_12b;//Input voltage is converted into a 12bit number giving a maximum value of 4096

ADC_init_structure.ADC_ContinuousConvMode = DISABLE; //the conversion is continuous, the input data is converted once

ADC_init_structure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//no trigger for conversion

ADC_init_structure.ADC_NbrOfConversion = 1;

ADC_init_structure.ADC_ScanConvMode = DISABLE;//The scan is configured in one channel

ADC_Init(ADC1,&ADC_init_structure);//Initialize ADC with the previous configuration

//Enable ADC conversion

ADC_Cmd(ADC1,ENABLE);

//Select the channel to be read from

ADC_RegularChannelConfig(ADC1,ADC_Channel_15,1,ADC_SampleTime_144Cycles);

SystemCoreClockUpdate(); /* Get Core Clock Frequency */

if (SysTick_Config(SystemCoreClock / 10000)) { /* SysTick 10 msec interrupts */

while (1); /* Capture error */

}

while(1) { /* Loop forever */

if(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)){//if((ADC1->SR & 0x00000002))

if(i<2048)

dene1[i]=(ADC_GetConversionValue(ADC1));

else if(i>2048 && i<4096)

dene2[i-2048]=(ADC_GetConversionValue(ADC1));

else if(i>4096 && i<6144)

dene3[i-4096]=(ADC_GetConversionValue(ADC1));

else if(i>6144 && i<8192)

dene4[i-6144]=(ADC_GetConversionValue(ADC1));

else

dene5[i-8192]=(ADC_GetConversionValue(ADC1));

i++;

if(i==10000){

i=0;

}

}

}

}

Answer 1

[Pragati]

The question you’re asking—how to plot ADC data in MATLAB—is primarily about getting sampled data into MATLAB and visualizing it. In your current setup, the ADC data is being generated on an STM32 and stored in arrays (dene1, dene2, etc.), but MATLAB has no direct visibility into that data yet.

Recommended practical approach

Step 1 — Get data into MATLAB

You still need to:

• Send dene[i] from STM32 to MATLAB (e.g., via serial/USB)
• Store it as a MATLAB vector

Step 2 — Basic plotting

Once data is in MATLAB:

plot(data);

xlabel('Sample Index');

ylabel('ADC Code');

title('ADC Output');

Step 3 — (Optional, but powerful) Use Mixed-Signal Blockset-style analysis

• Compare with an ideal ADC model
• Analyze frequency content (FFT)
• Evaluate dynamic performance metrics

https://www.mathworks.com/help/msblks/data-converters.html?s_tid=CRUX_lftnav