Diff: tsl410r.cpp

Revision:

1:d913e0afb2ac

Parent:

0:5acbbe3f4cf4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tsl410r.cpp	Wed Jul 16 23:33:12 2014 +0000
@@ -0,0 +1,74 @@
+#include "mbed.h"
+#include "tsl1410r.h"
+
+TSL1410R::TSL1410R(PinName siPort, PinName clockPort, PinName aoPort)
+    : si(siPort), clock(clockPort), ao(aoPort)
+{
+    // clear out power-on noise by clocking through all pixels twice
+    clear();
+    clear();
+}
+
+void TSL1410R::clear()
+{
+    // clock in an SI pulse
+    si = 1;
+    clock = 1;
+    clock = 0;
+    si = 0;
+    
+    // clock out all pixels
+    for (int i = 0 ; i < nPix+1 ; ++i) {
+        clock = 1;
+        clock = 0;
+    }
+}
+
+void TSL1410R::read(uint16_t *pix, int n, int integrate_us)
+{
+    // Start an integration cycle - pulse SI, then clock all pixels.  The
+    // CCD will integrate light starting 18 clocks after the SI pulse, and
+    // continues integrating until the next SI pulse, which cannot occur
+    // until all pixels have been clocked.
+    si = 1;
+    clock = 1;
+    clock = 0;
+    si = 0;
+    for (int i = 0 ; i < nPix+1 ; ++i) {
+        clock = 1;
+        clock = 0;
+    }
+        
+    // delay by the specified additional integration time
+    wait_us(integrate_us);
+    
+    // end the current integration cycle and hold the integrated values
+    si = 1;
+    clock = 1;
+    clock = 0;
+    si = 0;
+    
+    // figure how many pixels to skip on each read
+    int skip = nPix/n - 1;
+
+    // read the pixels
+    for (int src = 0, dst = 0 ; src < nPix ; ++src)
+    {
+        // read this pixel
+        pix[dst++] = ao.read_u16();
+        
+        // clock in the next pixel
+        clock = 1;
+        clock = 0;
+        
+        // clock skipped pixels
+        for (int i = 0 ; i < skip ; ++i, ++src) {
+            clock = 1;
+            clock = 0;
+        }
+    }
+    
+    // clock out one extra pixel to make sure the device is ready for another go
+    clock = 1;
+    clock = 0;
+}