From 8a08b9dce9cfc161494ddb07a1c979c7796780ff Mon Sep 17 00:00:00 2001
From: Sebastian Reichel <sre@ring0.de>
Date: Fri, 15 Jun 2012 22:56:00 +0200
Subject: restructure code

it is now loading its components from plugins
---
 sensors/barometer/bmp085.vala | 140 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 sensors/barometer/bmp085.vala

(limited to 'sensors/barometer/bmp085.vala')

diff --git a/sensors/barometer/bmp085.vala b/sensors/barometer/bmp085.vala
new file mode 100644
index 0000000..f0da790
--- /dev/null
+++ b/sensors/barometer/bmp085.vala
@@ -0,0 +1,140 @@
+/* Copyright 2012, Sebastian Reichel <sre@ring0.de>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+public class BMP085 : I2CDevice, Barometer {
+	public uint8 oversampling_setting = 0x03;
+	private Calibration cal = Calibration();
+
+	private int64 next_temp_measurement;
+	private int raw_temp;
+	private int raw_pressure;
+
+	private int64 temp_correction_coefficient;
+
+	struct Calibration {
+		int16 AC1;
+		int16 AC2;
+		int16 AC3;
+		uint16 AC4;
+		uint16 AC5;
+		uint16 AC6;
+		int16 B1;
+		int16 B2;
+		int16 MB;
+		int16 MC;
+		int16 MD;
+	}
+
+	public BMP085(uint8 dev, uint8 addr = 0x77) throws I2CError {
+			setup(dev, addr);
+			read_calibration_values();
+	}
+
+	public void init(KeyFile cfg) throws KeyFileError, I2CError {
+		var adapter = cfg.get_uint64("BMP085", "i2c-adapter");
+		var address = cfg.get_uint64("BMP085", "i2c-address");
+		setup((uint8) adapter, (uint8) address);
+		read_calibration_values();
+	}
+
+	private void read_calibration_values() throws I2CError {
+		var data = get_block(0xaa, 22);
+		cal.AC1 =  data[0] << 8 | data[1];
+		cal.AC2 =  data[2] << 8 | data[3];
+		cal.AC3 =  data[4] << 8 | data[5];
+		cal.AC4 =  data[6] << 8 | data[7];
+		cal.AC5 =  data[8] << 8 | data[9];
+		cal.AC6 = data[10] << 8 | data[11];
+		cal.B1  = data[12] << 8 | data[13];
+		cal.B2  = data[14] << 8 | data[15];
+		cal.MB  = data[16] << 8 | data[17];
+		cal.MC  = data[18] << 8 | data[19];
+
+		cal.MD  = data[20] << 8 | data[21];
+	}
+
+	private void msleep(uint msecs) {
+		Posix.usleep(msecs*1000);
+	}
+
+	private void update_raw_temperature() throws I2CError {
+		set_byte(0xf4, 0x2e);
+		msleep(5);
+		var data = get_block(0xf6, 2);
+		raw_temp = data[0] << 8 | data[1];
+		next_temp_measurement = time_t() + 1;
+	}
+
+	private void update_raw_pressure() throws I2CError {
+		set_byte(0xf4, 0x34 + (oversampling_setting<<6));
+		msleep(2+(3 << oversampling_setting<<1));
+		var data = get_block(0xf6, 3);
+		raw_pressure = data[0] << 16 | data[1] << 8 | data[2];
+		raw_pressure >>= 8-oversampling_setting;
+	}
+
+	public int32 get_temperature() throws I2CError {
+		if(next_temp_measurement+1 < time_t())
+			update_raw_temperature();
+
+		int64 x1 = ((raw_temp - cal.AC6) * cal.AC5) >> 15;
+		int64 x2 = (cal.MC << 11) / (x1 + cal.MD);
+		temp_correction_coefficient = x1 + x2 - 4000;
+
+		return (int32) (x1+x2+8) >> 4;
+	}
+
+	public int32 get_pressure() throws I2CError {
+		int64 x1, x2, x3, b3, p;
+		uint64 b4, b7;
+
+		if(next_temp_measurement+1 < time_t())
+			get_temperature();
+
+		update_raw_pressure();
+
+		x1 = (temp_correction_coefficient * temp_correction_coefficient) >> 12;
+		x1 *= cal.B2;
+		x1 >>= 11;
+
+		x2 = cal.AC2 * temp_correction_coefficient;
+		x2 >>= 11;
+
+		x3 = x1 + x2;
+
+		b3 = (((((int64)cal.AC1) * 4 + x3) << oversampling_setting) + 2) >> 2;
+
+		x1 = (cal.AC3 * temp_correction_coefficient) >> 13;
+		x2 = (cal.B1 * ((temp_correction_coefficient * temp_correction_coefficient) >> 12)) >> 16;
+		x3 = (x1 + x2 + 2) >> 2;
+		b4 = (cal.AC4 * (uint64)(x3 + 32768)) >> 15;
+
+		b7 = ((uint64)raw_pressure - b3) * (50000 >> oversampling_setting);
+		p = (int64) ((b7 < 0x80000000) ? ((b7 << 1) / b4) : ((b7 / b4) * 2));
+
+		x1 = p >> 8;
+		x1 *= x1;
+		x1 = (x1 * 3038) >> 16;
+		x2 = (-7357 * p) >> 16;
+		p += (x1 + x2 + 3791) >> 4;
+
+		return (int32) p;
+	}
+}
+
+public Type register_plugin (Module module) {
+	// types are registered automatically
+	return typeof(BMP085);
+}
-- 
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