Hi, I have to sample a signal and then send it to pc, I've set the sample rate to 300Khz, the speed of the serial port to 500KByte/s and a single sample is an 8 bit number but my pc receives only 50Ksample/s(50Kbyte/s), can I reach a speed of 100/200Ksample or 50Ks is the maximum speed that I can use?How much time takes a Serial.print() instruction?
This is the arduino sketch:
byte mask=B01000000;//mask for start of conversion & state of conversion
boolean first=true;
char t=' ';
void setup()
{
Serial.begin(4000000);//500kByte/s, super speed!
ADMUX=B01100000;//I'm using input A0,result is left adjusted
DIDR0=0x01;//shut off digital input for A0
ADCSRA=B11000010;//I'm using 4 as division factor
ADCSRB=0x00;//free running, default setting
}
void loop()
{
if(first)//do it only the first time
{
startofconversion();
first=false;
}
t=waitandget();
Serial.print(t);//send data
startofconversion();//start a new conversion
}
void startofconversion()
{
ADCSRA=ADCSRA|mask;//let's start a conversion!
}
byte waitandget()
{
while((ADCSRA&mask)==mask)//wait
{
}
return ADCH;
}