This is the schematic of the AD775 Fast analog to digital converter setup;
Here is a picture of the screen.
//**************************************** // Three color 3MspS ext AtoD Scope // By Bob Davis // UTFT_(C)2012 Henning Karlsen // web: http://www.henningkarlsen.com/electronics // #include// Declare which fonts we will be using extern uint8_t SmallFont[]; extern uint8_t BigFont[]; extern uint8_t SevenSegNumFont[]; // Note that control pins are now assigned to 8-11 UTFT myGLCD(ILI9325C,8,9,10,11); int Input=0; int Sample[320]; int StartSTime=0; int EndSTime=0; float SampleTime=0; void DrawMarkers(){ myGLCD.setColor(0, 200, 0); myGLCD.drawLine(0, 0, 0, 240); myGLCD.drawLine(54, 0, 54, 240); myGLCD.drawLine(107, 0, 107, 240); myGLCD.drawLine(160, 0, 160, 240); myGLCD.drawLine(213, 0, 213, 240); myGLCD.drawLine(266, 0, 266, 240); myGLCD.drawLine(319, 0, 319, 240); myGLCD.drawLine(0, 0, 319, 0); myGLCD.drawLine(0, 50, 319, 50); myGLCD.drawLine(0, 100, 319, 100); myGLCD.drawLine(0, 150, 319, 150); myGLCD.drawLine(0, 200, 319, 200); myGLCD.drawLine(0, 239, 319, 239); } void setup() { myGLCD.InitLCD(); myGLCD.clrScr(); pinMode(14, INPUT); pinMode(15, INPUT); pinMode(16, INPUT); pinMode(17, INPUT); pinMode(18, INPUT); pinMode(19, INPUT); } void loop() { // set color(Red, Green, Blue) range = 0 to 255 myGLCD.setBackColor(0, 0, 0); myGLCD.setFont(BigFont); char buf[12]; while(1) { DrawMarkers(); // wait for trigger of a positive input while (Input == 0){ Input = digitalRead(A1); } // collect the analog data into an array // Read analog port as a parallel port using PINC // Code with no loop is about 50% faster! StartSTime = micros(); Sample[0]=PINC; Sample[1]=PINC; Sample[2]=PINC; Sample[3]=PINC; Sample[4]=PINC; Sample[5]=PINC; Sample[6]=PINC; Sample[7]=PINC; Sample[8]=PINC; Sample[9]=PINC; Sample[10]=PINC; Sample[11]=PINC; Sample[12]=PINC; Sample[13]=PINC; Sample[14]=PINC; Sample[15]=PINC; Sample[16]=PINC; Sample[17]=PINC; Sample[18]=PINC; Sample[19]=PINC; Sample[20]=PINC; Sample[21]=PINC; Sample[22]=PINC; Sample[23]=PINC; Sample[24]=PINC; Sample[25]=PINC; Sample[26]=PINC; Sample[27]=PINC; Sample[28]=PINC; Sample[29]=PINC; Sample[30]=PINC; Sample[31]=PINC; Sample[32]=PINC; Sample[33]=PINC; Sample[34]=PINC; Sample[35]=PINC; Sample[36]=PINC; Sample[37]=PINC; Sample[38]=PINC; Sample[39]=PINC; Sample[40]=PINC; Sample[41]=PINC; Sample[42]=PINC; Sample[43]=PINC; Sample[44]=PINC; Sample[45]=PINC; Sample[46]=PINC; Sample[47]=PINC; Sample[48]=PINC; Sample[49]=PINC; Sample[50]=PINC; Sample[51]=PINC; Sample[52]=PINC; Sample[53]=PINC; Sample[54]=PINC; Sample[55]=PINC; Sample[56]=PINC; Sample[57]=PINC; Sample[58]=PINC; Sample[59]=PINC; Sample[60]=PINC; Sample[61]=PINC; Sample[62]=PINC; Sample[63]=PINC; Sample[64]=PINC; Sample[65]=PINC; Sample[66]=PINC; Sample[67]=PINC; Sample[68]=PINC; Sample[69]=PINC; Sample[70]=PINC; Sample[71]=PINC; Sample[72]=PINC; Sample[73]=PINC; Sample[74]=PINC; Sample[75]=PINC; Sample[76]=PINC; Sample[77]=PINC; Sample[78]=PINC; Sample[79]=PINC; Sample[80]=PINC; Sample[81]=PINC; Sample[82]=PINC; Sample[83]=PINC; Sample[84]=PINC; Sample[85]=PINC; Sample[86]=PINC; Sample[87]=PINC; Sample[88]=PINC; Sample[89]=PINC; Sample[90]=PINC; Sample[91]=PINC; Sample[92]=PINC; Sample[93]=PINC; Sample[94]=PINC; Sample[95]=PINC; Sample[96]=PINC; Sample[97]=PINC; Sample[98]=PINC; Sample[99]=PINC; Sample[100]=PINC; Sample[101]=PINC; Sample[102]=PINC; Sample[103]=PINC; Sample[104]=PINC; Sample[105]=PINC; Sample[106]=PINC; Sample[107]=PINC; Sample[108]=PINC; Sample[109]=PINC; Sample[110]=PINC; Sample[111]=PINC; Sample[112]=PINC; Sample[113]=PINC; Sample[114]=PINC; Sample[115]=PINC; Sample[116]=PINC; Sample[117]=PINC; Sample[118]=PINC; Sample[119]=PINC; Sample[120]=PINC; Sample[121]=PINC; Sample[122]=PINC; Sample[123]=PINC; Sample[124]=PINC; Sample[125]=PINC; Sample[126]=PINC; Sample[127]=PINC; Sample[128]=PINC; Sample[129]=PINC; Sample[130]=PINC; Sample[131]=PINC; Sample[132]=PINC; Sample[133]=PINC; Sample[134]=PINC; Sample[135]=PINC; Sample[136]=PINC; Sample[137]=PINC; Sample[138]=PINC; Sample[139]=PINC; Sample[140]=PINC; Sample[141]=PINC; Sample[142]=PINC; Sample[143]=PINC; Sample[144]=PINC; Sample[145]=PINC; Sample[146]=PINC; Sample[147]=PINC; Sample[148]=PINC; Sample[149]=PINC; Sample[150]=PINC; Sample[151]=PINC; Sample[152]=PINC; Sample[153]=PINC; Sample[154]=PINC; Sample[155]=PINC; Sample[156]=PINC; Sample[157]=PINC; Sample[158]=PINC; Sample[159]=PINC; Sample[160]=PINC; Sample[161]=PINC; Sample[162]=PINC; Sample[163]=PINC; Sample[164]=PINC; Sample[165]=PINC; Sample[166]=PINC; Sample[167]=PINC; Sample[168]=PINC; Sample[169]=PINC; Sample[170]=PINC; Sample[171]=PINC; Sample[172]=PINC; Sample[173]=PINC; Sample[174]=PINC; Sample[175]=PINC; Sample[176]=PINC; Sample[177]=PINC; Sample[178]=PINC; Sample[179]=PINC; Sample[180]=PINC; Sample[181]=PINC; Sample[182]=PINC; Sample[183]=PINC; Sample[184]=PINC; Sample[185]=PINC; Sample[186]=PINC; Sample[187]=PINC; Sample[188]=PINC; Sample[189]=PINC; Sample[190]=PINC; Sample[191]=PINC; Sample[192]=PINC; Sample[193]=PINC; Sample[194]=PINC; Sample[195]=PINC; Sample[196]=PINC; Sample[197]=PINC; Sample[198]=PINC; Sample[199]=PINC; Sample[200]=PINC; Sample[201]=PINC; Sample[202]=PINC; Sample[203]=PINC; Sample[204]=PINC; Sample[205]=PINC; Sample[206]=PINC; Sample[207]=PINC; Sample[208]=PINC; Sample[209]=PINC; Sample[210]=PINC; Sample[211]=PINC; Sample[212]=PINC; Sample[213]=PINC; Sample[214]=PINC; Sample[215]=PINC; Sample[216]=PINC; Sample[217]=PINC; Sample[218]=PINC; Sample[219]=PINC; Sample[220]=PINC; Sample[221]=PINC; Sample[222]=PINC; Sample[223]=PINC; Sample[224]=PINC; Sample[225]=PINC; Sample[226]=PINC; Sample[227]=PINC; Sample[228]=PINC; Sample[229]=PINC; Sample[230]=PINC; Sample[231]=PINC; Sample[232]=PINC; Sample[233]=PINC; Sample[234]=PINC; Sample[235]=PINC; Sample[236]=PINC; Sample[237]=PINC; Sample[238]=PINC; Sample[239]=PINC; Sample[240]=PINC; Sample[241]=PINC; Sample[242]=PINC; Sample[243]=PINC; Sample[244]=PINC; Sample[245]=PINC; Sample[246]=PINC; Sample[247]=PINC; Sample[248]=PINC; Sample[249]=PINC; Sample[250]=PINC; Sample[251]=PINC; Sample[252]=PINC; Sample[253]=PINC; Sample[254]=PINC; Sample[255]=PINC; Sample[256]=PINC; Sample[257]=PINC; Sample[258]=PINC; Sample[259]=PINC; Sample[260]=PINC; Sample[261]=PINC; Sample[262]=PINC; Sample[263]=PINC; Sample[264]=PINC; Sample[265]=PINC; Sample[266]=PINC; Sample[267]=PINC; Sample[268]=PINC; Sample[269]=PINC; Sample[270]=PINC; Sample[271]=PINC; Sample[272]=PINC; Sample[273]=PINC; Sample[274]=PINC; Sample[275]=PINC; Sample[276]=PINC; Sample[277]=PINC; Sample[278]=PINC; Sample[279]=PINC; Sample[280]=PINC; Sample[281]=PINC; Sample[282]=PINC; Sample[283]=PINC; Sample[284]=PINC; Sample[285]=PINC; Sample[286]=PINC; Sample[287]=PINC; Sample[288]=PINC; Sample[289]=PINC; Sample[290]=PINC; Sample[291]=PINC; Sample[292]=PINC; Sample[293]=PINC; Sample[294]=PINC; Sample[295]=PINC; Sample[296]=PINC; Sample[297]=PINC; Sample[298]=PINC; Sample[299]=PINC; Sample[300]=PINC; Sample[301]=PINC; Sample[302]=PINC; Sample[303]=PINC; Sample[304]=PINC; Sample[305]=PINC; Sample[306]=PINC; Sample[307]=PINC; Sample[308]=PINC; Sample[309]=PINC; Sample[310]=PINC; Sample[311]=PINC; Sample[312]=PINC; Sample[313]=PINC; Sample[314]=PINC; Sample[315]=PINC; Sample[316]=PINC; Sample[317]=PINC; Sample[318]=PINC; Sample[319]=PINC; EndSTime = micros(); // display the collected analog data from array for(int xpos=0; xpos<319; xpos++) { // Erase old stuff myGLCD.setColor(0, 0, 0); myGLCD.drawLine (xpos+1, 1, xpos+1, 180); // Draw new data if (xpos%10==0) DrawMarkers(); myGLCD.setColor(255, 255, 255); myGLCD.drawLine (xpos, Sample[xpos]*2, xpos+1, Sample[xpos+1]*2); } // display the sample time myGLCD.setColor(0, 0, 255); SampleTime = EndSTime - StartSTime; myGLCD.print("uSeconds= ", 10, 220); myGLCD.print(ltoa(SampleTime, buf, 10), 170, 220); } }
Is there not some kind of loop-unrolling flag/optimizing flag you could use for GCC for this? I know the Arduino IDE may not make this easily available, but manually unrolling a loop like that just doesn't sound like a great idea.
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