Rick McConney / sfh7779

Gsma Version

Dependents:   GSMACode stripReader

att160826.h@1:fc2dbccffe34, 2017-04-21 (annotated)

Committer:
elmkom
Date:
Fri Apr 21 17:58:08 2017 +0000
Revision:
1:fc2dbccffe34
Parent:
0:5e15a306a518 
Proximity strip reader

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmkom 0:5e15a306a518 1 #include "pca9548.h"
elmkom 0:5e15a306a518 2 #include "sfh7779.h"
elmkom 0:5e15a306a518 3
elmkom 1:fc2dbccffe34 4 #define SENSORS_PER_STRIP 8
elmkom 0:5e15a306a518 5
elmkom 0:5e15a306a518 6 typedef struct {
elmkom 0:5e15a306a518 7 bool present;
elmkom 0:5e15a306a518 8 sfh7779_measurements_t sample;
elmkom 0:5e15a306a518 9 } sfh7779_data_t;
elmkom 0:5e15a306a518 10
elmkom 0:5e15a306a518 11 typedef struct {
elmkom 0:5e15a306a518 12 sfh7779_data_t sensor[SENSORS_PER_STRIP];
elmkom 0:5e15a306a518 13 } att160826_data_t;
elmkom 0:5e15a306a518 14
elmkom 0:5e15a306a518 15 class ATT160826
elmkom 0:5e15a306a518 16 {
elmkom 0:5e15a306a518 17 public:
elmkom 0:5e15a306a518 18 /**
elmkom 0:5e15a306a518 19 * Constructor
elmkom 0:5e15a306a518 20 *
elmkom 0:5e15a306a518 21 * @param i2c I2C class servicing the strip
elmkom 0:5e15a306a518 22 * @param addr_3bit address of the strip (A0-A2 of I2C multiplexer)
elmkom 0:5e15a306a518 23 * Valid values are 0-7
elmkom 0:5e15a306a518 24 * @param reset optional DigitalOut class that resets the strip
elmkom 0:5e15a306a518 25 * Not needed if hardware reset is not used or if reset
elmkom 0:5e15a306a518 26 * is not managed by the class.
elmkom 0:5e15a306a518 27 */
elmkom 0:5e15a306a518 28 ATT160826(I2C * i2c, uint8_t addr_3bit, DigitalOut * reset = NULL) {
elmkom 0:5e15a306a518 29 _pca9548 = new PCA9548(i2c, addr_3bit, reset);
elmkom 0:5e15a306a518 30 for (int x = 0; x < SENSORS_PER_STRIP; x++) {
elmkom 0:5e15a306a518 31 _sfh7779[x] = new SFH7779(i2c);
elmkom 0:5e15a306a518 32 }
elmkom 0:5e15a306a518 33 }
elmkom 0:5e15a306a518 34
elmkom 0:5e15a306a518 35 /**
elmkom 0:5e15a306a518 36 * Destructor
elmkom 0:5e15a306a518 37 */
elmkom 0:5e15a306a518 38 ~ATT160826() {
elmkom 0:5e15a306a518 39 if (_pca9548) {
elmkom 0:5e15a306a518 40 delete _pca9548;
elmkom 0:5e15a306a518 41 }
elmkom 0:5e15a306a518 42 for (int x = 0; x < SENSORS_PER_STRIP; x++) {
elmkom 0:5e15a306a518 43 if (_sfh7779[x]) {
elmkom 0:5e15a306a518 44 delete _sfh7779[x];
elmkom 0:5e15a306a518 45 }
elmkom 0:5e15a306a518 46 }
elmkom 0:5e15a306a518 47 }
elmkom 0:5e15a306a518 48
elmkom 0:5e15a306a518 49 /**
elmkom 0:5e15a306a518 50 * Sample all sensors on the strip (proximity, visual ambient light, and infrared ambient light).
elmkom 0:5e15a306a518 51 * Sensors are all activated, sampled, and then placed in standby mode to conserve power consumption.
elmkom 0:5e15a306a518 52 *
elmkom 0:5e15a306a518 53 * @param att160826_data pointer to a buffer which will be filled with a sensor data
elmkom 0:5e15a306a518 54 *
elmkom 0:5e15a306a518 55 * @returns true if successfull
elmkom 0:5e15a306a518 56 */
elmkom 0:5e15a306a518 57 bool scan(att160826_data_t * att160826_data) {
elmkom 0:5e15a306a518 58
elmkom 0:5e15a306a518 59 // Clear all previous measurements before starting the scan
elmkom 0:5e15a306a518 60 memset(att160826_data, 0, sizeof(att160826_data_t));
elmkom 0:5e15a306a518 61
elmkom 0:5e15a306a518 62 if (_pca9548) {
elmkom 0:5e15a306a518 63 // Enable all sensors
elmkom 0:5e15a306a518 64 for (int x = 0; x < SENSORS_PER_STRIP; x++) {
elmkom 0:5e15a306a518 65 int channel_idx = x;
elmkom 0:5e15a306a518 66 bool ok = _pca9548->select_channel(channel_idx)
elmkom 0:5e15a306a518 67 && _sfh7779[x]
elmkom 0:5e15a306a518 68 && _sfh7779[x]->enable();
elmkom 0:5e15a306a518 69 att160826_data->sensor[x].present = ok;
elmkom 0:5e15a306a518 70 }
elmkom 0:5e15a306a518 71
elmkom 0:5e15a306a518 72 // Collect data from all sensors (throw away 1st sample and keep 2nd)
elmkom 0:5e15a306a518 73 for (int y = 0; y < 1; y++) {
elmkom 0:5e15a306a518 74 for (int x = 0; x < SENSORS_PER_STRIP; x++) {
elmkom 0:5e15a306a518 75 int channel_idx = x;
elmkom 0:5e15a306a518 76 if (att160826_data->sensor[x].present &&
elmkom 0:5e15a306a518 77 _pca9548->select_channel(channel_idx)) {
elmkom 0:5e15a306a518 78 _sfh7779[x]->read(&(att160826_data->sensor[x].sample), 500);
elmkom 0:5e15a306a518 79 }
elmkom 0:5e15a306a518 80 }
elmkom 0:5e15a306a518 81 }
elmkom 0:5e15a306a518 82 /*
elmkom 0:5e15a306a518 83 // Disable all sensors
elmkom 0:5e15a306a518 84 for (int x = 0; x < SENSORS_PER_STRIP; x++) {
elmkom 0:5e15a306a518 85 int channel_idx = x;
elmkom 0:5e15a306a518 86 bool ok = _pca9548->select_channel(channel_idx)
elmkom 0:5e15a306a518 87 && _sfh7779[x]->disable();
elmkom 0:5e15a306a518 88 }
elmkom 0:5e15a306a518 89 */
elmkom 0:5e15a306a518 90 // Disconnect all sensors from the I2C bus
elmkom 0:5e15a306a518 91 _pca9548->reset();
elmkom 0:5e15a306a518 92 }
elmkom 0:5e15a306a518 93
elmkom 0:5e15a306a518 94 return true;
elmkom 0:5e15a306a518 95 }
elmkom 0:5e15a306a518 96
elmkom 0:5e15a306a518 97 protected:
elmkom 0:5e15a306a518 98 PCA9548 * _pca9548;
elmkom 0:5e15a306a518 99 SFH7779 * _sfh7779[SENSORS_PER_STRIP];
elmkom 0:5e15a306a518 100 };