Hello Mr. TJF
First of All, thank you so much for providing support on real-time tasks
using a low cost plataform.
I'm trying to apply the libary "libpruio" to make a system for energy
meansurement using the beaglebone black. To do this, I need to enable 2
ADC channels, set a sample time, fil a buffer with the samples and make
some calculation that includes the FFT. I'm really newbie on
microprocessors, but i wrote a simple C code. The idea of this code is just
to make 128 samples os the two channels and print the values. Just it:
#include "unistd.h"
#include "../c_wrapper/pruio.h" // include header
#include "time.h"
//! The main function.
int main(/*int argc, char **argv*/)
{
float n[256];
int a[256];
int i=0;
pruIo *io = pruio_new(PRUIO_DEF_ACTIVE, 0x98, 0, 1); //! create new
driver structure
pruio_adc_setStep(io, 9, 1, 0, 0, 0);
// step 9, AIN-0
pruio_adc_setStep(io, 10, 2, 0, 0, 0);
if (pruio_config(io, 128, 9<<10 , 156250, 4)){ // upload (default)
settings, start IO mode
printf("config failed (%s)\n", io->Errr);}
else {
if (pruio_rb_start(io)) printf("rb_start failed (%s)\n", io->Errr); //
start measurement
else{
sleep(1);
i=io->DRam[0];
a[i] = i;
n[i] = io->Adc->Value[i];
do{
if(i != io->DRam[0]){
i=io->DRam[0];
a[i] = i;
n[i] = io->Adc->Value[i];
}
}while(io->DRam[0] < 126);
a[io->DRam[0]] = io->DRam[0];
n[io->DRam[0]] = io->Adc->Value[io->DRam[0]];
for(i = 0; i<=127; i++ ){
printf("amostra %d ----- %f \n", a[i],
(n[i]/65536)*1.8);
}
}
/* we're done */
}
pruio_destroy(io); /* destroy driver structure */
return 0;
}
as result, I receive this:
amostra 1 ----- 0.000000
amostra 0 ----- -0.000012
amostra 2 ----- 1.799561
amostra 3 ----- 1.799561
amostra -1092378024 ----- -0.000012
amostra 5 ----- 1.799561
amostra 6 ----- 1.799561
amostra 7 ----- 1.799561
amostra -1092377860 ----- 0.000000
amostra 9 ----- 1.799561
amostra 10 ----- 1.799561
amostra 11 ----- 1.799561
amostra 12 ----- 1.799561
amostra 466005475 ----- 0.000000
amostra 14 ----- 1.799561
amostra 15 ----- 1.799561
amostra 1 ----- 0.000000
amostra -1225151312 ----- -0.000012
amostra 18 ----- 1.799561
amostra 19 ----- 1.799561
amostra 3 ----- -0.000000
amostra 21 ----- 1.799561
amostra 22 ----- 1.799561
amostra 23 ----- 1.799561
amostra -1225186212 ----- 0.000000
amostra 25 ----- 1.799561
amostra 26 ----- 1.799561
amostra 27 ----- 1.799561
amostra 1 ----- 0.000000
amostra 29 ----- 1.799561
amostra 30 ----- 1.799561
amostra 31 ----- 1.799561
amostra 0 ----- -0.000012
amostra 33 ----- 1.799561
amostra 34 ----- 1.799561
amostra 35 ----- 1.799561
amostra -1092377728 ----- 0.000000
amostra 37 ----- 1.799561
amostra 38 ----- 1.799561
amostra 39 ----- 1.799561
amostra 0 ----- -0.000000
amostra 41 ----- 1.799561
amostra 42 ----- 1.799561
amostra 43 ----- 1.799561
amostra 0 ----- 0.000000
amostra 45 ----- 1.799561
amostra 46 ----- 1.799561
amostra 47 ----- 1.799561
amostra 0 ----- 0.000000
amostra 49 ----- 1.799561
amostra 50 ----- 1.799561
amostra 51 ----- 1.799561
amostra 0 ----- 0.000000
amostra 53 ----- 1.799561
amostra 54 ----- 1.799561
amostra 55 ----- 1.799561
amostra -1225159968 ----- 0.000000
amostra 57 ----- 1.799561
amostra 58 ----- 1.799561
amostra 59 ----- 1.799561
amostra -1092376444 ----- 0.000000
amostra 61 ----- 1.799561
amostra 62 ----- 1.799561
amostra 63 ----- 1.799561
amostra 0 ----- 0.000000
amostra 65 ----- 1.799561
amostra 66 ----- 1.799561
amostra 67 ----- 1.799561
amostra 6 ----- 0.000000
amostra 69 ----- 1.799561
amostra 70 ----- 1.799561
amostra 71 ----- 1.799561
amostra 0 ----- 0.000000
amostra 73 ----- 1.799561
amostra 74 ----- 1.799561
amostra 75 ----- 1.799561
amostra 0 ----- 0.000000
amostra 77 ----- 1.799561
amostra 78 ----- 1.799561
amostra 79 ----- 1.799561
amostra 0 ----- 0.000000
amostra 81 ----- 1.799561
amostra 82 ----- 1.799561
amostra 83 ----- 1.799561
amostra 0 ----- -0.000000
amostra 85 ----- 1.799561
amostra 86 ----- 1.799561
amostra 87 ----- 1.799561
amostra 0 ----- 0.000000
amostra 89 ----- 1.799561
amostra 90 ----- 1.799561
amostra 91 ----- 1.799561
amostra -1225160672 ----- -0.000000
amostra 93 ----- 1.799561
amostra 94 ----- 1.799561
amostra 95 ----- 1.799561
amostra 96 ----- 1.799561
amostra 0 ----- -0.000000
amostra 98 ----- 1.799561
amostra 99 ----- 1.799561
amostra 0 ----- 0.000000
amostra 101 ----- 1.799561
amostra 102 ----- 1.799561
amostra 103 ----- 1.799561
amostra -1225162752 ----- 0.000000
amostra 105 ----- 1.799561
amostra 106 ----- 1.799561
amostra 107 ----- 1.799561
amostra -1092377440 ----- 0.000000
amostra 109 ----- 1.799561
amostra 110 ----- 1.799561
amostra 111 ----- 1.799561
amostra 0 ----- -0.000000
amostra 113 ----- 1.799561
amostra 114 ----- 1.799561
amostra 115 ----- 1.799561
amostra 0 ----- -0.000012
amostra 0 ----- 0.000000
amostra 118 ----- 1.799561
amostra 119 ----- 1.799561
amostra 0 ----- -0.000012
amostra 121 ----- 1.799561
amostra 122 ----- 1.799561
amostra 123 ----- 1.799561
amostra 0 ----- 0.000000
amostra 125 ----- 1.799561
amostra 126 ----- 1.799561
amostra -1092376512 ----- 0.000000
As you can see, the index does not obey the right sequency... do you have
any idea why doe it happen??
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/beagleboard/b04c57b8-9256-4d3a-8ed4-3b330ee3d046%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
