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AnalogInput2.cpp
Go to the documentation of this file.
1 #include <stdio.h>
2 #include <unistd.h>
3
4 #include "../hubolib.h"
5
6 using namespace HuboLib;
7
8 /*
9 Compile and link:
10 g++ AnalogInput2.cpp -L../ -lhubo -lpthread -lrt -o AnalogInput2.out
11 Run:
12 sudo ./AnalogInput2.out
13 Purpose:
14 Using oversampling in order to increase the resolution of an ADC sample value.
15 */
16
17 int main(void)
18 {
19 // Initialize the library once in your program.
20 if (!Initialize())
21 {
22 printf ("Error: Initialize\n");
23 return 1;
24 }
25
26 // Define channel 0 to be oversampled 4 times (set to 4) all other channels (set to 0) are not read from the ADC.
27 unsigned short overSampling[MAX_MCP3x08_CHANNELS] = { 4, 0, 0, 0, 0, 0, 0, 0 };
28 Set_MCP3x08_Oversampling (overSampling);
29
30 int channel = 0;
31 unsigned long adcCount;
32 double volt;
33 for (int i=0; i<20; i++)
34 {
35 // Read channel 0 and output its value.
36 if (Get_AI_Channel (channel, adcCount, volt))
37 {
38 printf ("Channel=%d ADC count=0x%02lX Volts=%lf\n", channel, adcCount, volt);
39 // Again - you'll see that you're getting the bufferd value a bit later.
40 // As it can be seen from the adcCount - the value is about 4 times as high while the
41 // voltage is still the same. Oversampled values are just added up, while the voltage
42 // is averaged over the 4 samples.
43 // Also you'll notice that the time to get the averaged value has not increased
44 // compared to the previouse example where no oversampling was used. This is why all
45 // oversampling will be done in one and the same cycle time slice.
46 }
47 else
48 {
49 printf ("Error: Get_AI_Channel\n");
50 }
51
52 usleep(1000);
53 }
54
55 // Free library resources.
56 Uninitialize();
57
58 return 0;
59 }
main
int main(void)
Definition: AnalogInput2.cpp:17
MAX_MCP3x08_CHANNELS
#define MAX_MCP3x08_CHANNELS
Definition: hubolib.h:39
HuboLib::Initialize
bool Initialize()
Initializes the library.
HuboLib::Get_AI_Channel
bool Get_AI_Channel(int channel, unsigned long &count, double &volt)
Get the buffered and oversampled data from the MCP3x08.
HuboLib::Set_MCP3x08_Oversampling
bool Set_MCP3x08_Oversampling(unsigned short overSampling[MAX_MCP3x08_CHANNELS])
Specifies the ADC channels to be sampled as well as the number they get oversampled.
HuboLib::Uninitialize
void Uninitialize()
Releases any resources bound to the library.
HuboLib
Definition: hubocfg.h:10