Diff: AS3935_ext.cpp

Revision:

0:a1be9313a67a

Child:

1:7eb1731e4764

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AS3935_ext.cpp	Thu Aug 27 16:15:47 2015 +0000
@@ -0,0 +1,91 @@
+/*
+AS3935_ext.cpp - AS3935 Franklin Lightning Sensor™ IC by AMS library
+Copyright (c) 2015 T.Naka. All rights reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#include "AS3935_ext.h"
+
+AS3935_ext::AS3935_ext(PinName sda, PinName scl, int adresse, PinName irqin): AS3935(sda, scl ,adresse)
+{
+    irq = irqin;
+    wait_ms(11);
+}
+
+void AS3935_ext::reset()
+{
+
+    AS3935::reset();
+    
+    // Callibrate automatically the internal RCO Oscillators 
+    registerWrite(0x3D,0xff,0x96);
+    wait_ms(2);
+    
+    // Minimum number of lightning
+    registerWrite(AS3935_MIN_NUM_LIGH ,1);
+    
+    // Set SREJ
+    registerWrite(AS3935_SREJ,0x02);
+}
+
+int AS3935_ext::MeasureLCOFreq()
+{
+    DigitalIn display(irq);
+    int t0;
+    int t1;
+    float hz;
+    unsigned int ticks_per_second;
+    // int d;
+#define LFCLK_FREQUENCY 0x8000
+#define RTC_COUNTER_SIZE 0x1000000
+    ticks_per_second = LFCLK_FREQUENCY / (NRF_RTC1->PRESCALER + 1);
+
+    // Set LCO_FDIV as 32 (0x3) (multiply 128)
+    wait_ms(20);
+    registerWrite(AS3935_LCO_FDIV,0x3);
+
+    // Enable display LCO on IRQ
+    wait_ms(20);
+    registerWrite(AS3935_DISP_LCO,1);
+    
+    wait_ms(100);
+
+    // Wait until IRQ becomes low;
+    while(display.read() == 1)
+
+    // Wait until IRQ becomes high
+    wait_ms(20);
+    while(display.read() == 0);
+    t0 = NRF_RTC1->COUNTER;
+
+    for(int i=0;i<1000;i++) {
+        // Wait until IRQ becomes low
+        while(display.read() == 1);
+
+        // Wait until IRQ becomes high;
+        while(display.read() == 0);
+    }
+    t1 = NRF_RTC1->COUNTER;
+    // printf("%d\r\n",t1-t0);
+
+    // 1000*128/500k = 0.256sec
+    hz = 1000* 128 * ticks_per_second / (unsigned int)((t1 - t0 + RTC_COUNTER_SIZE) % RTC_COUNTER_SIZE);
+
+    // Disable display LCO on IRQ pin;
+    registerWrite(AS3935_DISP_LCO,0);
+
+    return(hz);
+}