Diff: TSL2561.cpp

Revision:

0:eec7bcd27c52

Child:

1:25a700e9b8ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TSL2561.cpp	Sun Feb 22 01:19:56 2015 +0000
@@ -0,0 +1,131 @@
+/*
+ * mbed library program
+ *  Luminosity sensor -- LIGHT-TO-DIGITAL CONVERTER (light intensity to a digital signal output)
+ *  TSL2561 by Texas Advanced Optoelectronic Solutions Inc.
+ *
+ * Copyright (c) 2015 Kenji Arai / JH1PJL
+ *  http://www.page.sannet.ne.jp/kenjia/index.html
+ *  http://mbed.org/users/kenjiArai/
+ *      Created: Feburary  21st, 2015
+ *      Revised: Feburary  22nd, 2015
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "TSL2561.h"
+
+TSL2561::TSL2561 (PinName p_sda, PinName p_scl) : _i2c(p_sda, p_scl)
+{
+    TSL2561_addr = TSL2561_ADDRESS_GND;
+    init();
+}
+
+TSL2561::TSL2561 (PinName p_sda, PinName p_scl, uint8_t addr) : _i2c(p_sda, p_scl)
+{
+    TSL2561_addr = addr;
+    init();
+}
+
+TSL2561::TSL2561 (I2C& p_i2c) : _i2c(p_i2c)
+{
+    TSL2561_addr = TSL2561_ADDRESS_GND;
+    init();
+}
+
+TSL2561::TSL2561 (I2C& p_i2c, uint8_t addr) : _i2c(p_i2c)
+{
+    TSL2561_addr = addr;
+    init();
+}
+
+/////////////// Read Lux from sensor //////////////////////
+/*
+For 0    < CH1/CH0 < 0.50 Lux = 0.0304  x CH0-0.062  x CH0 x ((CH1/CH0)1.4)
+For 0.50 < CH1/CH0 < 0.61 Lux = 0.0224  x CH0-0.031  x CH1
+For 0.61 < CH1/CH0 < 0.80 Lux = 0.0128  x CH0-0.0153 x CH1
+For 0.80 < CH1/CH0 < 1.30 Lux = 0.00146 x CH0-0.00112x CH1
+For        CH1/CH0 > 1.30 Lux = 0
+ */
+float TSL2561::lux()
+{
+    double lux0, lux1;
+    double ratio;
+    double dlux;
+
+    dt[0] = CMD_MULTI + TSL2561_DATA0LOW;
+    _i2c.write((int)TSL2561_addr, (char *)dt, 1, true);
+    _i2c.read(TSL2561_addr, (char *)dt, 2, false);
+    ch0 = dt[1] << 8 | dt[0];
+    dt[0] = CMD_MULTI + TSL2561_DATA1LOW;
+    _i2c.write((int)TSL2561_addr, (char *)dt, 1, true);
+    _i2c.read(TSL2561_addr, (char *)dt, 2, false);
+    ch1 = dt[1] << 8 | dt[0];
+    lux0 = ch0;
+    lux1 = ch1;
+    ratio = lux1 / lux0;
+    if (ratio <= 0.5) {
+        dlux = 0.03040 * lux0 - 0.06200 * lux0 * pow(ratio,1.4);
+    } else if (ratio <= 0.61) {
+        dlux = 0.02240 * lux0 - 0.03100 * lux1;
+    } else if (ratio <= 0.80) {
+        dlux = 0.01280 * lux0 - 0.01530 * lux1;
+    } else if (ratio <= 1.30) {
+        dlux = 0.00146 * lux0 - 0.00112 * lux1;
+    } else {
+        dlux = 0;
+    }
+    return (float)dlux;
+}
+
+/////////////// Initialize ////////////////////////////////
+void TSL2561::init()
+{
+    _i2c.frequency(100000);
+    power_up();
+    read_ID();
+}
+
+/////////////// ID ////////////////////////////////////////
+uint16_t TSL2561::read_ID()
+{
+    dt[0] = CMD_SINGLE + TSL2561_ID;
+    _i2c.write((int)TSL2561_addr, (char *)dt, 1, true);
+    _i2c.read(TSL2561_addr, (char *)dt, 2, false);
+    id_number = dt[0] << 8 | dt[1];
+    return id_number;
+}
+
+uint8_t TSL2561::who_am_i()
+{
+    read_ID();
+    if ((id_number >> 4) == I_AM_TSL2561) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+/////////////// Power ON/OFF //////////////////////////////
+void TSL2561::power_up()
+{
+    dt[0] = CMD_SINGLE + TSL2561_CONTROL;
+    dt[1] = 3;
+    _i2c.write((int)TSL2561_addr, (char *)dt, 2, false);
+}
+
+void TSL2561::power_down()
+{
+    dt[0] = CMD_SINGLE + TSL2561_CONTROL;
+    dt[1] = 0;
+    _i2c.write((int)TSL2561_addr, (char *)dt, 2, false);
+}
+
+/////////////// I2C Freq. /////////////////////////////////
+void TSL2561::frequency(int hz)
+{
+    _i2c.frequency(hz);
+}