Diff: att160826.h

Revision:

0:5e15a306a518

Child:

1:fc2dbccffe34

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/att160826.h	Wed Oct 26 18:39:17 2016 +0000
@@ -0,0 +1,100 @@
+#include "pca9548.h"
+#include "sfh7779.h"
+
+#define SENSORS_PER_STRIP   5
+
+typedef struct {
+    bool                    present;
+    sfh7779_measurements_t  sample;
+} sfh7779_data_t;
+
+typedef struct {
+    sfh7779_data_t  sensor[SENSORS_PER_STRIP];
+} att160826_data_t;
+
+class ATT160826
+{
+public:
+    /**
+    * Constructor
+    *
+    * @param i2c I2C class servicing the strip
+    * @param addr_3bit address of the strip (A0-A2 of I2C multiplexer)
+    *          Valid values are 0-7
+    * @param reset optional DigitalOut class that resets the strip
+    *          Not needed if hardware reset is not used or if reset 
+    *          is not managed by the class.
+    */
+    ATT160826(I2C * i2c, uint8_t addr_3bit, DigitalOut * reset = NULL) {
+        _pca9548 = new PCA9548(i2c, addr_3bit, reset);
+        for (int x = 0; x < SENSORS_PER_STRIP; x++) {
+            _sfh7779[x] = new SFH7779(i2c);
+        }
+    }
+
+    /**
+    * Destructor
+    */
+    ~ATT160826() {
+        if (_pca9548) {
+            delete _pca9548;
+        }
+        for (int x = 0; x < SENSORS_PER_STRIP; x++) {
+            if (_sfh7779[x]) {
+                delete _sfh7779[x];
+            }
+        }
+    }
+
+    /**
+    * Sample all sensors on the strip (proximity, visual ambient light, and infrared ambient light).
+    * Sensors are all activated, sampled, and then placed in standby mode to conserve power consumption.
+    *
+    * @param att160826_data pointer to a buffer which will be filled with a sensor data
+    *
+    * @returns true if successfull
+    */
+    bool scan(att160826_data_t * att160826_data) {
+        
+        // Clear all previous measurements before starting the scan
+        memset(att160826_data, 0, sizeof(att160826_data_t));
+        
+        if (_pca9548) {
+            // Enable all sensors
+            for (int x = 0; x < SENSORS_PER_STRIP; x++) {
+                int channel_idx = x;
+                bool ok = _pca9548->select_channel(channel_idx)
+                          && _sfh7779[x]                            
+                          && _sfh7779[x]->enable();
+                att160826_data->sensor[x].present = ok;
+            }
+            
+            // Collect data from all sensors (throw away 1st sample and keep 2nd)
+            for (int y = 0; y < 1; y++) {
+                for (int x = 0; x < SENSORS_PER_STRIP; x++) {
+                    int channel_idx = x;
+                    if (att160826_data->sensor[x].present &&
+                        _pca9548->select_channel(channel_idx)) {
+                        _sfh7779[x]->read(&(att160826_data->sensor[x].sample), 500);
+                    }
+                }
+            }
+            /*
+            // Disable all sensors
+            for (int x = 0; x < SENSORS_PER_STRIP; x++) {
+                int channel_idx = x;
+                bool ok = _pca9548->select_channel(channel_idx)
+                          && _sfh7779[x]->disable();
+            }
+            */
+            // Disconnect all sensors from the I2C bus
+            _pca9548->reset();
+        }
+        
+        return true;
+    }
+
+protected:
+    PCA9548 *       _pca9548;
+    SFH7779 *       _sfh7779[SENSORS_PER_STRIP];
+};