微處理器 - Microchip ATmega2560 (Arduino Mega) - 如何提高analogRead()讀取速率

參考資訊：
http://www.gammon.com.au/forum/?id=12779
https://www.arduino.cn/thread-12569-1-1.html

unsigned short buf[16] = { 0 };
int cc = 0;
int adc[16] = { A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15 };

void setup() {
    Serial.begin(460800);
    ADCSRA |= (1 << ADPS2);
    ADCSRA &= ~(1 << ADPS1);
    ADCSRA &= ~(1 << ADPS0);
    Serial.flush();
}

void loop() {
    for (cc = 0; cc < 16; cc++) {
        buf[cc] = analogRead(adc[cc]);
    }
    Serial.write((unsigned char*)buf, 16);
}

P.S. 預設Sample Rate最高只有9600Hz，ADC Prescaler改為16後，Sample Rate可以達到76.8KHz