CaryCoders / AS3935

AS3935 Lightning sensor library

Dependents:   zeus

Fork of AS3935 by valentin spanu

include the mbed library with this snippet

#include "mbed.h"
#include "AS3935.h"

 // frdm-kl25z sd card connections for spi1 
 // ------------------------------------------------
 // Header -- kl25z -- SD/MMC          
 // J2-20  -- PTE1  -- MOSI
 // J9-13  -- PTE4  -- CS
 // J2-14  -- GND   -- Vss (GND) 
 // J9-9   -- PTE2  -- SCK
 // J9-11  -- PTE3  -- MISO
 
AS3935 ld(PTE1, PTE3, PTE2, PTE4, "ld", 100000); // MOSI, MISO, SCK, CS, SPI bus freq (hz) 
InterruptIn IntLightning(PTA12); //IRQ AS3935
DigitalOut led1(LED_RED);
Serial pc(USBTX, USBRX);

void DetectLightning()
{
    char OriginInt;
     wait_ms(2); 
    OriginInt = ld.interruptSource();
    if (OriginInt == 1) { //
        pc.printf(" Noise level too high\r\n");
        }
    if (OriginInt == 4) { //
        pc.printf(" Disturber\r\n");
        }
    if (OriginInt == 8) { // detection
        // pc.printf(" Lightning detection\r\n");
        pc.printf(" Lightning detection, distance=%dkm\r\n", ld.lightningDistanceKm());
        ld.clearStats();

        }
}

 
int main() {
    pc.baud(9600);
    pc.printf("\r\nstart lightning detector\r\n");
    
    //initialisations
    ld.reset();
    ld.setTuneCap(5); // 500kHz
    ld.powerUp();
    ld.setIndoors();  
    ld.setMinimumLightnings(1);
    //ld.setSpikeRejection(2);
    ld.setNoiseFloor(2);
    ld.disableDisturbers();
    //ld.enableDisturbers();
    ld.setWatchdogThreshold(2);
    wait_ms(10);
    IntLightning.rise(&DetectLightning);
    int MinBlysk = ld.getMinimumLightnings();
    int Noise = ld.getNoiseFloor();
    int TuneCap = ld.getTuneCap();
    int SpikeRej = ld.getSpikeRejection();
    int WatchDog = ld.getWatchdogThreshold();
     
    pc.printf(" Min wylad: %i", MinBlysk);
    pc.printf("\r\n");
    pc.printf(" Noise: %i", Noise);
    pc.printf("\r\n");
    pc.printf(" Tune CAP: %i", TuneCap);
    pc.printf("\r\n");
    pc.printf(" Spike rej: %i", SpikeRej);
    pc.printf("\r\n");
    pc.printf(" Watchdog: %i", WatchDog);
    pc.printf("\r\n");
    while(1) {
        led1 = ! led1;
        wait(0.2);
     }
    
 
 }

Diff: AS3935.cpp

Revision:
9:19a323b1c508
Parent:
8:60e1b6b39e1c
Child:
10:bf33e2946bab
--- a/AS3935.cpp	Wed Jun 17 15:04:28 2015 +0000
+++ b/AS3935.cpp	Thu Jun 18 15:47:39 2015 +0000
@@ -88,7 +88,7 @@
     regval >>= (_ffsz(mask));
     return regval;
 }
-
+#if 0 
 void AS3935::reset()
  {
     m_Cs = 0;
@@ -97,7 +97,7 @@
     m_Cs = 1;
     wait_ms(2);
 } 
-
+#endif 
 void AS3935::presetDefault()
  {
     m_Cs = 0;
@@ -341,35 +341,40 @@
     registerWrite(AS3935_CL_STAT,0);
     registerWrite(AS3935_CL_STAT,1);
 }
+    
+static void intrPulseCntr(void)    {sgIntrPulseCount++;} 
 
-int AS3935::calibrateRCOs (void)
+int AS3935::calibrateRCOs (InterruptIn &intrIn)
 {
     int rc;
     uint8_t trco;
     uint8_t srco;
-    m_Cs = 0;
-    m_Spi.write(0x3D);        // Direct Command Calibrate RCO
-    m_Spi.write(0x96);
-    m_Cs = 1;
-    wait_ms(1);                          // wait 1ms
-    registerWrite(AS3935_DISP_SRCO, 0x40);    // ERRATA: after power down mode
-    wait_ms(2);                                   // wait 1ms
-    registerWrite(AS3935_DISP_SRCO, 0x00);    // ERRATA: after power down mode
-    wait_ms(1);
-    // cal sequence from acurite follows
-    registerWrite(AS3935_DISP_SRCO, 0x48); 
-    wait_ms(1);
-    registerWrite(AS3935_DISP_LCO, 0x8); 
-    wait_ms(1);
-    registerWrite(AS3935_DISP_TRCO, 0x28); 
-    wait_ms(1);
-    registerWrite(AS3935_DISP_SRCO, 0x48); 
-    wait_ms(1);
-    registerWrite(AS3935_DISP_LCO, 0x8); 
-    wait_ms(1); 
+    Timer pulseTimer;
+    int timeNow; 
+    unsigned long measFreq; 
+    
+    intrIn.rise(intrPulseCntr); 
+    
+    _SPITransfer2(0x3D, 0x96);                        // send command to calibrate the internal RC oscillators           
+    _SPITransfer2(8, 0x20);                           // put TRCO on the IRQ line for measurement   
+    wait_ms(20);                                      // wait for the chip to output the frequency, ususally ~2 ms 
     
-    trco=registerRead(0x3A, 0x80);        // Read out Calibration of TRCO done
-    srco=registerRead(0x3B, 0x80);        // Readout Calibration of SRCO done
+    pulseTimer.reset(); 
+    pulseTimer.start(); 
+    sgIntrPulseCount = 0;                             // reset the interrupt counter which serves as our frequency\pulse counter     
+    
+    timeNow = 0; 
+    while (timeNow < 500)                             // wait for 0.5 seconds
+    {
+      timeNow = pulseTimer.read_ms(); 
+    }
+    _SPITransfer2(8, 0);                              // stop the output of the frequncy on IRQ line       
+    measFreq = sgIntrPulseCount << 1;                 // calculate the measure frequency based upon period of capture and freq scaler
+
+    printf("timer RCO: %ld Hz\n\r", measFreq);
+    
+    trco=registerRead(0x3A, 0x80);                      // Read out Calibration of TRCO done
+    srco=registerRead(0x3B, 0x80);                      // Readout Calibration of SRCO done
     if(trco != 0x00 && srco != 0x00)
     {
         rc = 1;
@@ -385,11 +390,6 @@
 }
 
 
-void intrPulseCntr(void)
-{
-    sgIntrPulseCount++; 
-} 
-
 unsigned long AS3935::tuneAntenna(InterruptIn &intrIn)
 {
 #define ANTENA_RES_FREQ     (unsigned long)500000
@@ -403,10 +403,10 @@
 unsigned long error; 
     
     intrIn.rise(intrPulseCntr); 
+    _SPITransfer2(3, 0x80);                             // set frequency division to 64  
     
     for (tunCapCnt = 0; tunCapCnt < 16; ++tunCapCnt)    // loop for all possible values of the tuning capacitor
     {
-      _SPITransfer2(3, 0x80);
       _SPITransfer2(8, 0x80+tunCapCnt);                 // set the tuning cap and have the frequency output to the IRQ line 
       wait_ms(20);                                      // wait for the chip to output the frequency, ususally ~2 ms