Dynamic Memory Satured

[talakasse]

Hello everyone,

I recently started to use u8g2 to make two SSD1306 work on an single ATMEGA328P. My code is pretty heavy but u8g2lib is filling my dynamic memory to 96%. I only have 80 bytes left for my others vars.

Here's the message : The sketch uses 11658 bytes (37%) of program storage space. The maximum is 30720 bytes. Global variables use 1936 bytes (94%) of dynamic memory, leaving 112 bytes for local variables. The maximum is 2048 bytes. Low available memory, stability issues may occur.

I tried to use all the commands in the documentation but the minimum i reached is 94%, i also tried to delete some useless commands and fonts in the lib files but it didn't work.

If anybody have an idea it would be helpful.

tlk

[olikraus]

Which constructor did you use? You should use the page buffer mode!

[talakasse]

i use : U8G2_SSD1306_128X64_NONAME_F_HW_I2C display1(U8G2_R0, 5,4,U8X8_PIN_NONE); U8G2_SSD1306_128X64_NONAME_F_HW_I2C display2(U8G2_R0, 5,4,U8X8_PIN_NONE);

what is buffer mode ?

[olikraus]

what is [page] buffer mode ?

The solution to your problem:

https://github.com/olikraus/u8g2/blob/90b190043d1d15889c6ef4a66b33a3e6d23e6e1b/doc/faq.txt#L134-L142

In Arduino IDE you will also find a lot of example for the page buffer mode.

Manual: https://github.com/olikraus/u8g2/wiki/u8g2reference#firstpage

For more details, see here: https://github.com/olikraus/u8glib/wiki/tpictureloop

[talakasse]

ok thanks ! :)

[talakasse]

Hello again, I have a new posting problem... The problem is that I try to display a curve with a sensor (KY-039), with X and Y positions. Problem, in the display curve, there is just a small pixel that walks around and not the desired curve. But when I try on Adafruit, the curve works perfectly ! But the constraint forces me to take U8g2 because it is better. Do you have an idea ?

[talakasse]

include

include

include

include

U8G2_SSD1306_128X64_NONAME_1_HW_I2C display1(U8G2_R0, 5,4,U8X8_PIN_NONE); virtuabotixRTC myRTC(5,6,7);

define BUTTON1 2

define BUTTON2 4

define PTENTIO_MENU A7

define MAXx 128

define MINx 5

define MAXy 10

define MINy 50

unsigned long CTIME = 0, LTIME = 0; int bouton_buz = 8; int j ; float moyenne = 0 ; float tab [50] ; float maximum; float nbbpm ; long Time0; long Time; int cycle=1; int x1=0; int y1=40; int x2=0; int y2=40; float lastnbbpm; int seq; int echelle; int valpot; const int pot = A2 ; int bpm; const int capteurcardiaque = A0 ; const int ledv = 10; const int ledr = 9; const int ledj = 11; int tps=0; const int buzzer=12; int tpssec; int position[100]; int u = 0; int OLD_POS = 0; unsigned short int curve[MAXx - MINx] = {0}; int x = 0 ; // Variable de langue bool langue = 0;

void setup (){ display1.setI2CAddress(0x78); display1.begin(); display1.enableUTF8Print(); display1.setFont(u8g2_font_6x10_tr); display1.clearDisplay(); }

void loop (){ if(x1>127){

x1=1;
x2=x1;

} moyenne=0; for(j=0;j<50;j++){//on rempli le tableau de 50 valeurs lues par le capteur cardiaque tab[j] = analogRead(capteurcardiaque) ; moyenne = moyenne + tab[j] ; delay(1); } moyenne = (float)(moyenne / 50) ;//On calcul la moyenne de ces 50 valeurs //on cherche le seuil for (j=0;j<50;j++){ tab[j]=(tab[j]-moyenne);//On soustrait à ces valeurs la moyenne } maximum = 0; for(j=0;j<50;j++){//Dans cette boucle on determine le maximum du tableau if (tab[j]> maximum){ maximum = tab[j]; } } for(j=0;j<50;j++){//On divise le valeurs par le maximum si elle est superieur a 0 pour avoir des valeurs entre 1 et 0 if ((tab[j]/maximum)>=0){ tab[j] =(float)tab[j]/(float)maximum; } else{//Si le resultat de la division est négatif on donne à la valeur 0 tab[j]=0.00; } } for(j=0;j<50;j++){//ON compte combien de valeurs sont au dessus du seuil pour determiner le BPM if(tab[j]>0.95){ nbbpm=nbbpm+1; } } ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////// valpot=analogRead(pot); //on relie le potentiometre et la valeur du BPM echelle=map(valpot,0,1023,5,20);//on convertit les valeurs de 0 a 1023 en valeurs de 5 a 20 pour l'echelle

Time0 = ((float) millis()/(float) 1000); Time=5cycle; if((Time0/(Time))>=1){ nbbpm=(nbbpm12)/25; lastnbbpm=nbbpm; cycle++; seq= 128/((nbbpm/60)); Serial.println(nbbpm); }

display1.firstPage(); do {

display1.setFontMode(1);

display1.setDrawColor(1);

//int value = 0, max = 0, min = 0; if(x1%seq==0) {//Si le reste de la division de x1 par seq est egale à 0, y2=40-(nbbpm/6); y1=40; display1.drawLine(x1, y1,x2,y2);//On dessine une ligne entre le point (x1,y1) et (x2,y2) x1=x2;//x1 prend la valeur de x2 x2++;//x2 egal x2+1

}

if (x1%seq==1) {//Si le reste de la division de x1 par seq est egale à 1, y1=40-(nbbpm/6); y2=50; display1.drawLine(x1, y1,x2,y2);//On dessine une ligne entre le point (x1,y1) et (x2,y2) x1=x2;//x1 prend la valeur de x2 x2++;//x2 egal x2+1

}

if (x1%seq==2) {//Si le reste de la division de x1 par seq est egale à 2, y1= 50; y2=40; display1.drawLine(x1, y1,x2, y2);//On dessine une ligne entre le point (x1,y1) et (x2,y2) x1=x2;//x1 prend la valeur de x2 x2++;//x2 egal x2+1

}

if((x1%seq!=0) && (x1%seq!=1) && (x1%seq!=2)) {//On entre dans ce block si les conditions avant ne sont pas vérifiées y1=40; y2=40; display1.drawLine(x1, y1,x2, y2);//On dessine une ligne entre le point (x1,y1) et (x2,y2) y1=y2; x1=x2;//x1 prend la valeur de x2 x2++;//x2 egal x2+1 }

//COURBE MAUVAISE //COURBE(&value, &max, &min); /Serial.println(value); value = map(value, min, max, MAXy, MINy); if(x > /MAXx - MINx20){x = 0;Serial.println("RST : " + String(x));}; /curve[x] = value; Serial.println("INC : " + String(x)); Serial.println("VXX : " + String(x + MINx)); Serial.println("VAL : " + String(curve[x])); / //display1.firstPage();

//AFFICHAGE DE L'HEURE ET DU BPM

display1.setFontMode(1);
display1.setDrawColor(2);
display1.setCursor(0, 7);
display1.print(lastnbbpm);
display1.setCursor(35, 7);
display1.print("BPM");
display1.setCursor(76, 7);
display1.println(myRTC.hours);
display1.setCursor(90,7);
display1.println(":");
display1.setCursor(95,7);
display1.println(myRTC.minutes);
display1.setCursor(109,7);
display1.println(":");
display1.setCursor(114,7);
display1.println(myRTC.seconds);
// Ligne Horizontale et fleche 
display1.drawLine(0, 55 - 5, 128, 55 - 5);
display1.drawLine(128 - 4, 55 - 5 - 3, 128 - 1, 55 - 5);
display1.drawLine(128 - 4, 55 - 5 + 3, 128 - 1, 55 - 5);
// ligne verticale et fleche 
display1.drawLine(0 + 5, 55, 0 + 5, 10);
display1.drawLine(0 + 5, 10, 0 + 5 - 3, 10 + 4);
display1.drawLine(0 + 5, 10, 0 + 5 + 3, 10 + 4);

/display1.drawPixel(128 - 1, 31); display1.drawPixel(x, lastnbbpm); display1.drawRFrame(0,9,128,64-9,004); display1.drawRFrame(0,9,128,55,004);/

} while(display1.nextPage()); x1++;

}

[talakasse]

I try several ways and I really can't

[olikraus]

My suggestion is:

• Store the data in an array
• Draw the array content

Unfortunately your code is unreadable, still I do not see how you draw the content of "tab".

[talakasse]

ok I see where the problem is, thanks again for your help