78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
//
|
|
// FILE: Timing.ino
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.0.3
|
|
// PURPOSE: show performance of DallasTemperature lib
|
|
// compared to datasheet times per resolution
|
|
//
|
|
// HISTORY:
|
|
// 0.0.1 2017-07-25 initial version
|
|
// 0.0.2 2020-02-13 updates to work with current lib version
|
|
// 0.0.3 2020-02-20 added timing measurement of setResolution
|
|
|
|
#include <OneWire.h>
|
|
#include <DallasTemperature.h>
|
|
|
|
#define ONE_WIRE_BUS 2
|
|
|
|
OneWire oneWire(ONE_WIRE_BUS);
|
|
DallasTemperature sensor(&oneWire);
|
|
|
|
uint32_t start, stop;
|
|
|
|
|
|
void setup()
|
|
{
|
|
Serial.begin(9600);
|
|
Serial.println(__FILE__);
|
|
Serial.print("DallasTemperature Library version: ");
|
|
Serial.println(DALLASTEMPLIBVERSION);
|
|
|
|
sensor.begin();
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
float ti[4] = { 94, 188, 375, 750 };
|
|
|
|
Serial.println();
|
|
Serial.println("Test takes about 30 seconds for 4 resolutions");
|
|
Serial.println("RES\tTIME\tACTUAL\tGAIN");
|
|
for (int r = 9; r < 13; r++)
|
|
{
|
|
start = micros();
|
|
sensor.setResolution(r);
|
|
Serial.println(micros() - start);
|
|
|
|
start = micros();
|
|
sensor.setResolution(r);
|
|
Serial.println(micros() - start);
|
|
|
|
uint32_t duration = run(20);
|
|
float avgDuration = duration / 20.0;
|
|
|
|
Serial.print(r);
|
|
Serial.print("\t");
|
|
Serial.print(ti[r - 9]);
|
|
Serial.print("\t");
|
|
Serial.print(avgDuration, 2);
|
|
Serial.print("\t");
|
|
Serial.print(avgDuration * 100 / ti[r - 9], 1);
|
|
Serial.println("%");
|
|
}
|
|
delay(1000);
|
|
}
|
|
|
|
uint32_t run(int runs)
|
|
{
|
|
float t;
|
|
start = millis();
|
|
for (int i = 0; i < runs; i++)
|
|
{
|
|
sensor.requestTemperatures();
|
|
t = sensor.getTempCByIndex(0);
|
|
}
|
|
stop = millis();
|
|
return stop - start;
|
|
}
|