Diff: TSL2591.cpp

Revision:

59:169324c8e604

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TSL2591.cpp	Wed Mar 25 15:46:56 2020 +0000
@@ -0,0 +1,149 @@
+#include "TSL2591.h"
+
+TSL2591::TSL2591 (I2C& tsl2591_i2c, uint8_t tsl2591_addr):
+    _i2c(tsl2591_i2c), _addr(tsl2591_addr<<1)
+{
+    _init = false;
+    _integ = TSL2591_INTT_100MS;
+    _gain = TSL2591_GAIN_LOW;
+}
+/*
+ *  Initialize TSL2591
+ *  Checks ID and sets gain and integration time
+ */
+bool TSL2591::init(void)
+{
+    char write[] = {(TSL2591_CMD_BIT|TSL2591_REG_ID)};
+    if(_i2c.write(_addr, write, 1, 0) == 0) {
+        char read[1];
+        _i2c.read(_addr, read, 1, 0);
+        if(read[0] == TSL2591_ID) {
+            _init = true;
+            setGain(TSL2591_GAIN_LOW);
+            setTime(TSL2591_INTT_100MS);
+            disable();
+            return true;
+        }
+    }
+    return false;
+}
+/*
+ *  Power On TSL2591
+ */
+void TSL2591::enable(void)
+{
+    char write[] = {(TSL2591_CMD_BIT|TSL2591_REG_ENABLE), (TSL2591_EN_PON|TSL2591_EN_AEN|TSL2591_EN_AIEN|TSL2591_EN_NPIEN)};
+    _i2c.write(_addr, write, 2, 0);
+}
+/*
+ *  Power Off TSL2591
+ */
+void TSL2591::disable(void)
+{
+    char write[] = {(TSL2591_CMD_BIT|TSL2591_REG_ENABLE), (TSL2591_EN_POFF)};
+    _i2c.write(_addr, write, 2, 0);
+}
+/*
+ *  Set Gain and Write
+ *  Set gain and write time and gain
+ */
+void TSL2591::setGain(tsl2591Gain_t gain)
+{
+    enable();
+    _gain = gain;
+    char write[] = {(TSL2591_CMD_BIT|TSL2591_REG_CONTROL), (_integ|_gain)};
+    _i2c.write(_addr, write, 2, 0);
+    disable();
+}
+/*
+ *  Set Integration Time and Write
+ *  Set gain and write time and gain
+ */
+void TSL2591::setTime(tsl2591IntegrationTime_t integ)
+{
+    enable();
+    _integ = integ;
+    char write[] = {(TSL2591_CMD_BIT|TSL2591_REG_CONTROL), (_integ|_gain)};
+    _i2c.write(_addr, write, 2, 0);
+    disable();
+}
+/*
+ *  Read ALS
+ *  Read full spectrum, infrared, and visible
+ */
+void TSL2591::getALS(void)
+{
+    enable();
+    for(uint8_t t=0; t<=_integ+1; t++) {
+        wait(0.12);
+    }
+    char write1[] = {(TSL2591_CMD_BIT|TSL2591_REG_CHAN1_L)};
+    _i2c.write(_addr, write1, 1, 0);
+    char read1[2];
+    _i2c.read(_addr, read1, 2, 0);
+    char write2[] = {(TSL2591_CMD_BIT|TSL2591_REG_CHAN0_L)};
+    _i2c.write(_addr, write2, 1, 0);
+    char read2[2];
+    _i2c.read(_addr, read2, 2, 0);
+    rawALS = (((read1[1]<<8)|read1[0])<<16)|((read2[1]<<8)|read2[0]);
+    disable();
+    full = rawALS & 0xFFFF;
+    ir = rawALS >> 16;
+    visible = full - ir;
+}
+/*
+ *  Calculate Lux
+ */
+void TSL2591::calcLux(void)
+{
+    float atime, again, cpl, lux1, lux2, lux3;
+    if((full == 0xFFFF)|(ir == 0xFFFF)) {
+        lux3 = 0;
+        return;
+    }
+    switch(_integ) {
+        case TSL2591_INTT_100MS:
+            atime = 100.0F;
+            break;
+        case TSL2591_INTT_200MS:
+            atime = 200.0F;
+            break;
+        case TSL2591_INTT_300MS:
+            atime = 300.0F;
+            break;
+        case TSL2591_INTT_400MS:
+            atime = 400.0F;
+            break;
+        case TSL2591_INTT_500MS:
+            atime = 500.0F;
+            break;
+        case TSL2591_INTT_600MS:
+            atime = 600.0F;
+            break;
+        default:
+            atime = 100.0F;
+            break;
+    }
+    switch(_gain) {
+        case TSL2591_GAIN_LOW:
+            again = 1.0F;
+            break;
+        case TSL2591_GAIN_MED:
+            again = 25.0F;
+            break;
+        case TSL2591_GAIN_HIGH:
+            again = 428.0F;
+            break;
+        case TSL2591_GAIN_MAX:
+            again = 9876.0F;
+            break;
+        default:
+            again = 1.0F;
+            break;
+    }
+    cpl = (atime * again) / TSL2591_LUX_DF;
+    lux1 = ((float)full - (TSL2591_LUX_COEFB * (float)ir)) / cpl;
+    lux2 = (( TSL2591_LUX_COEFC * (float)full ) - ( TSL2591_LUX_COEFD * (float)ir)) / cpl;
+    lux3 = lux1 > lux2 ? lux1 : lux2;
+    lux = (uint32_t)lux3;
+}
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