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SpectrumAnalyzer.pde
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SpectrumAnalyzer.pde
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/*
Testing the nokia lcd
The following pins are used:
* 13 spi sclk -> serial clock
* 12 spi miso -> serial data from CYWM9635 to arduino
* 11 spi mosi -> serial data from arduino to LCD and CYWM9635
* 10 spi ss ->
* 9 LCD command or data
* 8 LCD reset
* 7 LCD chip select
* 6 mode button
* 5 CYW reset
* 4 CYW nSS slave select
*/
#include "nokia3310lcd.h"
#include "CYWM6935.h"
// std lib
#include <ctype.h>
Nokia3310LCD disp(9, 8, 7);
CYWM6935 radio(5, 4);
uint8_t signal [Nokia3310LCD::LCD_X_RES + 1];
uint8_t sigmax [Nokia3310LCD::LCD_X_RES + 1];
uint32_t sigsum [Nokia3310LCD::LCD_X_RES + 1];
uint8_t maxhist[Nokia3310LCD::LCD_X_RES + 1];
uint8_t maxhistpos;
static const uint8_t NORMAL_STEP_DECREASE = 5; // by how much to decrease in each step while in normal mode
static const uint8_t SLOW_STEP_DECREASE = 1; // by how much to decrease in each step while in slow mode
static const uint16_t SUMM_MEAS_COUNT = 300; // summing the last n measures to get an average
static const uint8_t pinBtnMode = 6;
uint32_t lastUpdate;
uint32_t lastCount;
enum OperationMode
{
MOD_COMBINED,
MOD_SLOW,
MOD_FAST,
MOD_ADDING,
MOD_HISORY,
MOD_OPTIONS_COUNT
} opmode;
static const char ModNames[5][8] = {"Combine", "Slow ", "Fast ", "Adding ", "History"};
bool DebouncedBtnPress(const uint8_t pinBtn, const uint16_t debounceDelay = 50);
void setup()
{
opmode = MOD_COMBINED;
maxhistpos = 0;
memset(signal, 0, sizeof(signal));
memset(sigmax, 0, sizeof(sigmax));
memset(sigsum, 0, sizeof(sigsum));
memset(maxhist, 0, sizeof(maxhist));
Serial.begin(19200);
Serial.println("init");
pinMode(pinBtnMode, INPUT);
Spi.init();
Spi.mode((1 << SPR0) | (1 << SPR1)); // set the spi clock to 125kHz
disp.init();
radio.init();
disp.LcdClear();
lastUpdate = 0;
lastCount = 0;
}
void loop()
{
static uint32_t loopcount = 0;
const uint32_t loopStart = millis();
// Read signals and process according "adding" and "fast"
uint8_t maxsig = 0;
const uint8_t decrStep = (opmode == MOD_SLOW ? SLOW_STEP_DECREASE : NORMAL_STEP_DECREASE);
for(uint8_t n=0; n<disp.LCD_X_RES - 1; ++n)
{
const uint8_t s = radio.RSSI(n); // returns 0 - 31
if(opmode == MOD_FAST)
signal[n] = s;
else if(s > signal[n] - decrStep)
signal[n] = s;
else if(signal[n] !=0) // if not greater, decrease it
signal[n] -= decrStep;
sigmax[n] = max(s, sigmax[n]);
sigsum[n] = sigsum[n] - sigsum[n] / min(loopcount, SUMM_MEAS_COUNT) + s;
maxsig = max(maxsig, s);
}
maxhist[maxhistpos] = maxsig;
if(++maxhistpos > disp.LCD_X_RES)
maxhistpos = 0;
// Draw the signal array
static const uint8_t nullpos = 39;
uint8_t *currarr = (opmode == MOD_ADDING ? sigmax : (opmode == MOD_HISORY ? maxhist : signal));
for(uint8_t n=0; n<disp.LCD_X_RES-1; ++n)
{
// show the current value as a line
const uint8_t sval = currarr[opmode == MOD_HISORY ? (n + maxhistpos) % disp.LCD_X_RES : n];
disp.LcdLine(n, n, 8, nullpos, Nokia3310LCD::PIXEL_OFF);
disp.LcdLine(n, n, nullpos, nullpos - sval, Nokia3310LCD::PIXEL_ON);
if(opmode == MOD_COMBINED)
{
// show the max as a pixel
if(sigmax[n])
disp.LcdPixel(n, nullpos - sigmax[n], Nokia3310LCD::PIXEL_ON);
// show the avg as an alternating pixel
if(loopcount % 2)
{
const uint8_t avgval = sigsum[n] / min(loopcount, SUMM_MEAS_COUNT);
if(avgval > 5)
disp.LcdPixel(n, nullpos - avgval, Nokia3310LCD::PIXEL_XOR);
}
}
}
if(!(loopcount % 20))
{
static uint8_t hdrcounter = 0;
static const char strings[3][15] = {"ICM Spectrum ", "Analyzer ", "2.40-2.484 GHz"};
disp.LcdGotoXYFont(1, 1);
disp.LcdStr(strings[hdrcounter++ % 3]);
}
// Set lower line acording to actual mode
disp.LcdGotoXYFont(1, 6);
disp.LcdStr("Mode ");
disp.LcdStr(ModNames[opmode]);
// display the sweeps per second
if(millis() - lastUpdate > 3000)
{
disp.LcdGotoXYFont(14, 6);
char tmp[5];
sprintf(tmp, "%d", 1000 * (loopcount - lastCount) / (millis() - lastUpdate));
disp.LcdStr(tmp);
lastUpdate = millis();
lastCount = loopcount;
}
disp.LcdUpdate();
// change mode from push button
if(DebouncedBtnPress(pinBtnMode))
{
switch(opmode)
{
case MOD_COMBINED:
opmode = MOD_SLOW;
break;
case MOD_SLOW:
opmode = MOD_FAST;
break;
case MOD_FAST:
opmode = MOD_ADDING;
break;
case MOD_ADDING:
opmode = MOD_HISORY;
break;
case MOD_HISORY:
default:
opmode = MOD_COMBINED;
break;
}
}
// change mode from serial command
if(Serial.available())
{
const char cc = toupper(Serial.read());
switch(cc)
{
case 'C':
opmode = MOD_COMBINED;
break;
case 'S':
opmode = MOD_SLOW;
break;
case 'F':
opmode = MOD_FAST;
break;
case 'A':
opmode = MOD_ADDING;
break;
case 'H':
opmode = MOD_HISORY;
break;
case 'R':
memset(signal, 0, sizeof(signal));
memset(sigmax, 0, sizeof(sigmax));
memset(sigsum, 0, sizeof(sigsum));
memset(maxhist, 0, sizeof(maxhist));
break;
default:
Serial.println("\nAvailable modes are:");
Serial.println("C : medium decrease rate including MAX and AVG");
Serial.println("S : slow decrease rate");
Serial.println("F : realtime signal");
Serial.println("A : exposure mode");
Serial.println("H : history of max signal strength over time");
Serial.println("R : reset the accumulated values");
break;
}
}
++loopcount;
}
bool DebouncedBtnPress(const uint8_t pinBtn, const uint16_t debounceDelay)
{
static bool btnState = false;
static bool btnLastState = false;
static uint32_t lastDebounceTime = 0;
const bool btnReading = (digitalRead(pinBtn) == HIGH);
// Serial.println(btnReading ? "btn pressed" : "btn open");
if(btnReading != btnLastState)
lastDebounceTime = millis(); // reset the debouncing timer
if((millis() - lastDebounceTime) > debounceDelay)
btnState = btnReading;
btnLastState = btnReading;
return (btnState && !btnLastState);
}