AMS, Franklin Lightning Sensor "AS3935" Library

/* * AMS, Franklin Lightning Sensor "AS3935" Library * Copyright (c) 2015 Hiroshi Suga * Released under the MIT License: http://mbed.org/license/mit */ // http://ams.com/eng/Products/Lightning-Sensor/Franklin-Lightning-Sensor/AS3935 #include "AS3935.h" //#define DBG(...) printf("" __VA_ARGS__) #define DBG(...) #define AS3935_ADDR 0x00 AS3935::AS3935 (I2C &i2c, PinName irq) : _i2c(i2c), _irq(irq) { _irq.mode(PullUp); _mode = 0; _type = 0; } AS3935::AS3935 (PinName sda, PinName scl, PinName irq) : _i2c(sda, scl), _irq(irq) { _irq.mode(PullUp); _mode = 0; _type = 0; } void AS3935::init () { char cmd[2]; cmd[0] = 0x3c; cmd[1] = 0x96; // PRESET_DEFAULT _i2c.write(AS3935_ADDR, cmd, 2); cmd[0] = 0x3d; cmd[1] = 0x96; // CALIB_RCO _i2c.write(AS3935_ADDR, cmd, 2); cmd[0] = 0x00; cmd[1] = (0x12<<1); // AFE_GB=12(Indoor) _i2c.write(AS3935_ADDR, cmd, 2); cmd[0] = 0x01; cmd[1] = (0x02<<4)|(0x02<<0); // NF_LEV, WDTH _i2c.write(AS3935_ADDR, cmd, 2); cmd[0] = 0x03; cmd[1] = 0x00; // LCO_FDIV = 1/16 _i2c.write(AS3935_ADDR, cmd, 2); calib_lco(); _irq.fall(this, &AS3935::isr_lightning); } // Antenna Tuning (500kHz) void AS3935::calib_lco () { int i, n, m = 10000, r = 0; char cmd[2]; Timer t; _mode = 0; _irq.fall(this, &AS3935::isr_freq); for (i = 0; i < 0x10; i ++) { cmd[0] = 0x08; cmd[1] = 0x80 | i; _i2c.write(AS3935_ADDR, cmd, 2); wait_ms(10); t.reset(); t.start(); _freq = 0; _mode = 1; while (t.read_ms() < 100); _mode = 0; n = abs(_freq - 3125); if (m > n) { r = i; } else { break; } m = n; } _irq.fall(NULL); t.stop(); cmd[0] = 0x08; cmd[1] = r; _i2c.write(AS3935_ADDR, cmd, 2); DBG("- init %d %d\r\n", r, _freq * 16 * 10); } void AS3935::read (int &energy, int &distance) { char cmd[4]; cmd[0] = 0x04; _i2c.write(AS3935_ADDR, cmd, 1, true); _i2c.read(AS3935_ADDR, cmd, 4); energy = ((cmd[2] & 0x1f) << 16) | (cmd[1] << 8) | cmd[0]; distance = cmd[3] & 0x3f; } void AS3935::isr_freq () { if (_mode == 1) { _freq ++; } } void AS3935::isr_lightning () { char cmd[2]; cmd[0] = 0x03; _i2c.write(AS3935_ADDR, cmd, 1, true); _i2c.read(AS3935_ADDR, cmd, 1); DBG("- irq %02x\r\n", cmd[0]); _type = cmd[0] & 0x0f; switch (_type) { case 0x01: // Noise level too high break; case 0x04: // Disturber detected break; case 0x08: // Lightning interrupt _func.call(); break; } }