Diff: QT2100.cpp

Revision:

0:2d6c5d39b4de

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QT2100.cpp	Tue Jan 13 00:11:41 2015 +0000
@@ -0,0 +1,209 @@
+
+/*
+Copyright (c) 2015 John Magyar
+
+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.
+*/
+
+#include "QT2100.h"
+#include "mbed.h"
+
+/*
+
+Mbed library for the Atmel QT2100 Capacative Touch sensor device.
+
+The QT2100 is a capacitive touch controller device with 10 configurable QTouch channels,
+supporting up to seven touch buttons, and either a single slider (or wheel).
+
+Datasheet: http://www.atmel.com/images/at42qt2100_e_level0%2013ww04.pdf
+
+*/
+
+QT2100::QT2100(PinName mosi,
+               PinName miso,
+               PinName sck,
+               PinName cs,
+               PinName tx,
+               PinName rx):
+    _spi(mosi, miso, sck),
+    _cs(cs),
+    _pc(tx, rx)
+{
+}
+
+QT2100::~QT2100()
+{
+}
+
+int qt2100[3];
+
+void QT2100::init()     // SPI interface initialization
+{
+    _cs = 1;
+    _spi.format(8,3);
+    _spi.frequency(750000);
+    wait_ms(600);
+}
+
+void QT2100::xfer3bytes(int byte0, int byte1, int byte2)     //  3-byte SPI transfer
+{
+    int xfer[3] = {byte0, byte1, byte2};
+
+    for (int i=0; i<3; i++) {
+        _cs = 0;
+        qt2100[i] = _spi.write(xfer[i]);
+        _cs = 1;
+        wait_us(100);
+    }
+}
+
+void QT2100::terminalDisplay()     //  print register values for debugging
+{
+    _pc.printf("\n");
+    for (int i=0; i<3; i++) {
+        _pc.printf("QT2100 Byte %d: 0x%x\n",i, qt2100[i]);
+    }
+}
+
+void QT2100::devId()     //  query Device ID and Firmware version
+{
+    xfer3bytes(0x40, 0x00, 0x00);     //  flush registers
+    xfer3bytes(0x40, 0x00, 0x00);     //  get id and version
+    terminalDisplay();
+}
+
+void QT2100::verifyChannels()     //  query sensors B1 through B7 and A1 through A3
+{
+    xfer3bytes(0x20, 0x00, 0x00);     //  flush registers
+    for (int i=0; i<10; i++) {
+        xfer3bytes(0x20, i, 0x00);     // get each channel's status
+        terminalDisplay();
+    }
+}
+
+int8_t QT2100::keys()     // get data from each key channel
+{
+    int8_t activeKey;
+
+    xfer3bytes(0x08, 0x78, 0x41);
+
+    switch(qt2100[1]) {
+        case (0x01):
+            activeKey = 0x01;
+            break;
+        case (0x02):
+            activeKey = 0x02;
+            break;
+        case (0x04):
+            activeKey = 0x04;
+            break;
+        case (0x08):
+            activeKey = 0x08;
+            break;
+        case (0x10):
+            activeKey = 0x10;
+            break;
+        case (0x20):
+            activeKey = 0x20;
+            break;
+        case (0x40):
+            activeKey = 0x40;
+            break;
+        case (0x80):
+            activeKey = 0x80;
+            break;
+        default:
+            activeKey = 0x00;
+    }
+    return activeKey;
+}
+
+int8_t QT2100::slider()     // get data from the slider channels
+{
+    int8_t sliderPosition;
+
+    xfer3bytes(0x08, 0x78, 0x40);     // 3 bits resolution, 8 positions (expandable to 8 bits, 256 positions)
+
+    switch(qt2100[2]) {
+        case (0x0):
+            sliderPosition = 0x01;
+            break;
+        case (0x01):
+            sliderPosition = 0x03;
+            break;
+        case (0x02):
+            sliderPosition = 0x07;
+            break;
+        case (0x03):
+            sliderPosition = 0x0f;
+            break;
+        case (0x04):
+            sliderPosition = 0x1f;
+            break;
+        case (0x05):
+            sliderPosition = 0x3f;
+            break;
+        case (0x06):
+            sliderPosition = 0x7f;
+            break;
+        case (0x07):
+            sliderPosition = 0xff;
+            break;
+        default:
+            sliderPosition = 0x00;
+    }
+    return sliderPosition;
+}
+
+int8_t QT2100::wheel()     // get data from the wheel channels
+{
+    int8_t wheelPosition;
+
+    xfer3bytes(0x00, 0x78, 0x40);     // 3 bits resolution, 8 positions (expandable to 8 bits, 256 positions)
+
+    switch(qt2100[2]) {
+        case (0x0):
+            wheelPosition = 0x01;
+            break;
+        case (0x01):
+            wheelPosition = 0x03;
+            break;
+        case (0x02):
+            wheelPosition = 0x07;
+            break;
+        case (0x03):
+            wheelPosition = 0x0f;
+            break;
+        case (0x04):
+            wheelPosition = 0x1f;
+            break;
+        case (0x05):
+            wheelPosition = 0x3f;
+            break;
+        case (0x06):
+            wheelPosition = 0x7f;
+            break;
+        case (0x07):
+            wheelPosition = 0xff;
+            break;
+        default:
+            wheelPosition = 0x00;
+    }
+    return wheelPosition;
+}