Diff: tsi_sensor.h

Revision:

0:9331e373c138

Child:

2:b7074bcc2376

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tsi_sensor.h	Sat Feb 22 11:07:29 2014 +0000
@@ -0,0 +1,198 @@
+/* Freescale Semiconductor Inc.
+ *
+ * mbed Microcontroller Library
+ * (c) Copyright 2009-2012 ARM Limited.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * 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.
+ */
+
+#ifndef TSISENSOR_H
+#define TSISENSOR_H
+
+/**
+* TSISensor example
+*
+* @code
+* #include "mbed.h"
+* #include "TSISensor.h"
+*
+* int main(void) {
+*    DigitalOut led(LED_GREEN);
+*    TSIElectrode elec0(9);
+*    TSIElectrode elec1(10);
+*    TSIAnalogSlider tsi(elec0, elec1, 40);
+*
+*    while (true) {
+*        printf("slider percentage: %f%\r\n", tsi.readPercentage());
+*        printf("slider distance: %dmm\r\n", tsi.readDistance());
+*        wait(1);
+*        led = !led;
+*    }
+* }
+* @endcode
+*/
+#define NO_TOUCH 0
+
+/** TSI Electrode with simple data required for touch detection.
+ */
+class TSIElectrode {
+public:
+    /** Initialize electrode.
+     */
+    TSIElectrode(uint32_t tsi_channel) : _threshold(100) {
+        _channel = (uint8_t)tsi_channel;
+    }
+    /** Set baseline.
+     */
+    void setBaseline(uint32_t baseline) {
+        _baseline = (uint16_t)baseline;
+    }
+    /** Set threshold.
+     */
+    void setThreshold(uint32_t threshold) {
+        _threshold = (uint16_t)threshold;
+    }
+    /** Set signal.
+     */
+    void setSignal(uint32_t signal) {
+        _signal = (uint16_t)signal;
+    }
+    /** Get baseline.
+     */
+    uint32_t getBaseline() {
+        return _baseline;
+    }
+    /** Get delta.
+     */
+    uint32_t getDelta() {
+        int32_t delta = getSignal() - getBaseline();
+        if (delta < 0) {
+            return 0;
+        } else {
+            return delta;
+        }
+    }
+    /** Get signal.
+     */
+    uint32_t getSignal() {
+        return _signal;
+    }
+    /** Get threshold.
+     */
+    uint32_t getThreshold() {
+        return _threshold;
+    }
+    /** Get channel.
+     */
+    uint32_t getChannel() {
+        return _channel;
+    }
+private:
+    uint8_t  _channel;
+    uint16_t _signal;
+    uint16_t _baseline;
+    uint16_t _threshold;
+};
+
+/** Analog slider which consists of two electrodes.
+ */
+class TSIAnalogSlider {
+public:
+    /**
+     *   Initialize the TSI Touch Sensor
+     */
+    TSIAnalogSlider(TSIElectrode& elec0, TSIElectrode& elec1, uint32_t range);
+    /**
+     * Read Touch Sensor percentage value
+     *
+     * @returns percentage value between [0 ... 1]
+     */
+    float readPercentage();
+    /**
+     * Read Touch Sensor distance
+     *
+     * @returns distance in mm. The value is between [0 ... _range]
+     */
+    uint32_t readDistance();
+    /** Get current electrode.
+     */
+    TSIElectrode* getCurrentElectrode() {
+        return _current_elec;
+    }
+    /** Set current electrode which is being measured.
+     */
+    void setCurrentElectrode(TSIElectrode *elec){
+        _current_elec = elec;
+    }
+    /** Get next electrode.
+     */
+    TSIElectrode* getNextElectrode(TSIElectrode* electrode) {
+        if (electrode->getChannel() == _elec0.getChannel()) {
+            return &_elec1;
+        } else {
+            return &_elec0;
+        }
+    }
+    /** Return absolute distance position.
+     */
+    uint32_t getAbsoluteDistance() {
+        return  _absolute_distance_pos;
+    }
+    /** Return absolute precentage position.
+     */
+    uint32_t getAbsolutePosition() {
+        return _absolute_percentage_pos;
+    }
+    /** Set value to the scan in progress flag.
+     */
+    void setScan(uint32_t scan) {
+        _scan_in_progress = scan;
+    }
+    /** Return instance to Analog slider. Used in tsi irq.
+     */
+    static TSIAnalogSlider *getInstance() {
+        return _instance;
+    }
+private:
+    void sliderRead(void);
+    void selfCalibration(void);
+    void setSliderPercPosition(uint32_t elec_num, uint32_t position) {
+        _percentage_position[elec_num] = position;
+    }
+    void setSliderDisPosition(uint32_t elec_num, uint32_t position) {
+        _distance_position[elec_num] = position;
+    }
+    void setAbsolutePosition(uint32_t position) {
+        _absolute_percentage_pos = position;
+    }
+    void setAbsoluteDistance(uint32_t distance) {
+        _absolute_distance_pos = distance;
+    }
+private:
+    TSIElectrode  _elec0;
+    TSIElectrode  _elec1;
+    uint8_t       _scan_in_progress;
+    TSIElectrode* _current_elec;
+    uint8_t       _percentage_position[2];
+    uint8_t       _distance_position[2];
+    uint32_t      _absolute_percentage_pos;
+    uint32_t      _absolute_distance_pos;
+    uint8_t       _range;
+protected:
+    static TSIAnalogSlider *_instance;
+};
+
+#endif