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131 | /**
* Channel scanner
*
* Example to detect interference on the various channels available.
* This is a good diagnostic tool to check whether you're picking a
* good channel for your application.
*
* Inspired by cpixip.
* See http://arduino.cc/forum/index.php/topic,54795.0.html
*/
#include <cstdlib>
#include <iostream>
#include <RF24/RF24.h>
using namespace std;
/****************** Linux ***********************/
// Radio CE Pin, CSN Pin, SPI Speed
// CE Pin uses GPIO number with BCM and SPIDEV drivers, other platforms use their own pin numbering
// CS Pin addresses the SPI bus number at /dev/spidev<a>.<b>
// ie: RF24 radio(<ce_pin>, <a>*10+<b>); spidev1.0 is 10, spidev1.1 is 11 etc..
// Generic:
RF24 radio(22, 0);
/****************** Linux (BBB,x86,etc) ***********************/
// See http://nRF24.github.io/RF24/pages.html for more information on usage
// See http://iotdk.intel.com/docs/master/mraa/ for more information on MRAA
// See https://www.kernel.org/doc/Documentation/spi/spidev for more information on SPIDEV
// Channel info
const uint8_t num_channels = 126;
uint8_t values[num_channels];
const int num_reps = 100;
int reset_array = 0;
int main(int argc, char** argv)
{
// Print preamble
// print example's name
printf("%s", argv[0]);
//
// Setup and configure rf radio
//
radio.begin();
radio.setAutoAck(false);
// Get into standby mode
radio.startListening();
radio.stopListening();
radio.printDetails();
// Print out header, high then low digit
int i = 0;
while (i < num_channels) {
printf("%x", i >> 4);
++i;
}
printf("\n");
i = 0;
while (i < num_channels) {
printf("%x", i & 0xf);
++i;
}
printf("\n");
// forever loop
while (1) {
// Clear measurement values
memset(values, 0, sizeof(values));
// Scan all channels num_reps times
int rep_counter = num_reps;
while (rep_counter--) {
int i = num_channels;
while (i--) {
// Select this channel
radio.setChannel(i);
// Listen for a little
radio.startListening();
delayMicroseconds(128);
radio.stopListening();
// Did we get a carrier?
if (radio.testCarrier()) {
++values[i];
}
}
}
// Print out channel measurements, clamped to a single hex digit
i = 0;
while (i < num_channels) {
if (values[i])
printf("%x", min(0xf, (values[i] & 0xf)));
else
printf("-");
++i;
}
printf("\n");
}
return 0;
}
// vim:ai:cin:sts=2 sw=2 ft=cpp
|