Priyanka Pashte / Mbed 2 deprecated ESD_Project_USBMouse

USBMouse

Dependencies:   USBDevice mbed

TouchSensor/TouchSensor.cpp@0:e062501cfe81, 2015-12-13 (annotated)

Committer:
priyankapashte
Date:
Sun Dec 13 10:06:24 2015 +0000
Revision:
0:e062501cfe81
USBDevice library modified

Who changed what in which revision?

UserRevisionLine numberNew contents of line
priyankapashte 0:e062501cfe81 1 /* Freescale Semiconductor Inc.
priyankapashte 0:e062501cfe81 2 * (c) Copyright 2004-2005 Freescale Semiconductor, Inc.
priyankapashte 0:e062501cfe81 3 * (c) Copyright 2001-2004 Motorola, Inc.
priyankapashte 0:e062501cfe81 4 *
priyankapashte 0:e062501cfe81 5 * mbed Microcontroller Library
priyankapashte 0:e062501cfe81 6 * (c) Copyright 2009-2012 ARM Limited.
priyankapashte 0:e062501cfe81 7 *
priyankapashte 0:e062501cfe81 8 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
priyankapashte 0:e062501cfe81 9 * and associated documentation files (the "Software"), to deal in the Software without
priyankapashte 0:e062501cfe81 10 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
priyankapashte 0:e062501cfe81 11 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
priyankapashte 0:e062501cfe81 12 * Software is furnished to do so, subject to the following conditions:
priyankapashte 0:e062501cfe81 13 *
priyankapashte 0:e062501cfe81 14 * The above copyright notice and this permission notice shall be included in all copies or
priyankapashte 0:e062501cfe81 15 * substantial portions of the Software.
priyankapashte 0:e062501cfe81 16 *
priyankapashte 0:e062501cfe81 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
priyankapashte 0:e062501cfe81 18 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
priyankapashte 0:e062501cfe81 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
priyankapashte 0:e062501cfe81 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
priyankapashte 0:e062501cfe81 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
priyankapashte 0:e062501cfe81 22 */
priyankapashte 0:e062501cfe81 23
priyankapashte 0:e062501cfe81 24 /*The code written by Freescale Semiconductors is used for reference*/
priyankapashte 0:e062501cfe81 25
priyankapashte 0:e062501cfe81 26 #include "TouchSensor.h"
priyankapashte 0:e062501cfe81 27
priyankapashte 0:e062501cfe81 28 #define SLIDER_LENGTH 40 //LENGTH in mm
priyankapashte 0:e062501cfe81 29
priyankapashte 0:e062501cfe81 30
priyankapashte 0:e062501cfe81 31 static uint8_t total_electrode = 3;
priyankapashte 0:e062501cfe81 32 static uint8_t elec_array[16]={9,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
priyankapashte 0:e062501cfe81 33 static uint16_t gu16TSICount[16];
priyankapashte 0:e062501cfe81 34 static uint16_t gu16Baseline[16];
priyankapashte 0:e062501cfe81 35 static uint16_t gu16Threshold[16]={100,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
priyankapashte 0:e062501cfe81 36 static uint16_t gu16Delta[16];
priyankapashte 0:e062501cfe81 37 static uint8_t ongoing_elec;
priyankapashte 0:e062501cfe81 38 static uint8_t end_flag = 1;
priyankapashte 0:e062501cfe81 39
priyankapashte 0:e062501cfe81 40 static uint8_t SliderPercentegePosition[2] = {0,0};
priyankapashte 0:e062501cfe81 41 static uint32_t AbsolutePercentegePosition = 0;
priyankapashte 0:e062501cfe81 42
priyankapashte 0:e062501cfe81 43 static void tsi_irq();
priyankapashte 0:e062501cfe81 44
priyankapashte 0:e062501cfe81 45 TouchSensor::TouchSensor() {
priyankapashte 0:e062501cfe81 46 SIM->SCGC5 |= SIM_SCGC5_PORTB_MASK;
priyankapashte 0:e062501cfe81 47 SIM->SCGC5 |= SIM_SCGC5_TSI_MASK;
priyankapashte 0:e062501cfe81 48
priyankapashte 0:e062501cfe81 49 TSI0->GENCS |= (TSI_GENCS_ESOR_MASK
priyankapashte 0:e062501cfe81 50 | TSI_GENCS_MODE(0)
priyankapashte 0:e062501cfe81 51 | TSI_GENCS_REFCHRG(4)
priyankapashte 0:e062501cfe81 52 | TSI_GENCS_DVOLT(0)
priyankapashte 0:e062501cfe81 53 | TSI_GENCS_EXTCHRG(7)
priyankapashte 0:e062501cfe81 54 | TSI_GENCS_PS(4)
priyankapashte 0:e062501cfe81 55 | TSI_GENCS_NSCN(11)
priyankapashte 0:e062501cfe81 56 | TSI_GENCS_TSIIEN_MASK
priyankapashte 0:e062501cfe81 57 | TSI_GENCS_STPE_MASK
priyankapashte 0:e062501cfe81 58 );
priyankapashte 0:e062501cfe81 59
priyankapashte 0:e062501cfe81 60 TSI0->GENCS |= TSI_GENCS_TSIEN_MASK;
priyankapashte 0:e062501cfe81 61
priyankapashte 0:e062501cfe81 62 NVIC_SetVector(TSI0_IRQn, (uint32_t)&tsi_irq);
priyankapashte 0:e062501cfe81 63 NVIC_EnableIRQ(TSI0_IRQn);
priyankapashte 0:e062501cfe81 64
priyankapashte 0:e062501cfe81 65 selfCalibration();
priyankapashte 0:e062501cfe81 66 }
priyankapashte 0:e062501cfe81 67
priyankapashte 0:e062501cfe81 68
priyankapashte 0:e062501cfe81 69 void TouchSensor::selfCalibration(void)
priyankapashte 0:e062501cfe81 70 {
priyankapashte 0:e062501cfe81 71 unsigned char cnt;
priyankapashte 0:e062501cfe81 72 unsigned char trigger_backup;
priyankapashte 0:e062501cfe81 73
priyankapashte 0:e062501cfe81 74 TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
priyankapashte 0:e062501cfe81 75 TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
priyankapashte 0:e062501cfe81 76
priyankapashte 0:e062501cfe81 77 if(TSI0->GENCS & TSI_GENCS_STM_MASK) // Back-up TSI Trigger mode from Application
priyankapashte 0:e062501cfe81 78 trigger_backup = 1;
priyankapashte 0:e062501cfe81 79 else
priyankapashte 0:e062501cfe81 80 trigger_backup = 0;
priyankapashte 0:e062501cfe81 81
priyankapashte 0:e062501cfe81 82 TSI0->GENCS &= ~TSI_GENCS_STM_MASK; // Use SW trigger
priyankapashte 0:e062501cfe81 83 TSI0->GENCS &= ~TSI_GENCS_TSIIEN_MASK; // Enable TSI interrupts
priyankapashte 0:e062501cfe81 84
priyankapashte 0:e062501cfe81 85 TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
priyankapashte 0:e062501cfe81 86
priyankapashte 0:e062501cfe81 87 for(cnt=0; cnt < total_electrode; cnt++) // Get Counts when Electrode not pressed
priyankapashte 0:e062501cfe81 88 {
priyankapashte 0:e062501cfe81 89 TSI0->DATA = ((elec_array[cnt] << TSI_DATA_TSICH_SHIFT) );
priyankapashte 0:e062501cfe81 90 TSI0->DATA |= TSI_DATA_SWTS_MASK;
priyankapashte 0:e062501cfe81 91 while(!(TSI0->GENCS & TSI_GENCS_EOSF_MASK));
priyankapashte 0:e062501cfe81 92 TSI0->GENCS |= TSI_GENCS_EOSF_MASK;
priyankapashte 0:e062501cfe81 93 gu16Baseline[cnt] = (TSI0->DATA & TSI_DATA_TSICNT_MASK);
priyankapashte 0:e062501cfe81 94 }
priyankapashte 0:e062501cfe81 95
priyankapashte 0:e062501cfe81 96 TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
priyankapashte 0:e062501cfe81 97 TSI0->GENCS |= TSI_GENCS_TSIIEN_MASK; // Enale TSI interrupt
priyankapashte 0:e062501cfe81 98 if(trigger_backup) // Restore trigger mode
priyankapashte 0:e062501cfe81 99 TSI0->GENCS |= TSI_GENCS_STM_MASK;
priyankapashte 0:e062501cfe81 100 else
priyankapashte 0:e062501cfe81 101 TSI0->GENCS &= ~TSI_GENCS_STM_MASK;
priyankapashte 0:e062501cfe81 102
priyankapashte 0:e062501cfe81 103 TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
priyankapashte 0:e062501cfe81 104
priyankapashte 0:e062501cfe81 105 TSI0->DATA = ((elec_array[0]<<TSI_DATA_TSICH_SHIFT) );
priyankapashte 0:e062501cfe81 106 TSI0->DATA |= TSI_DATA_SWTS_MASK;
priyankapashte 0:e062501cfe81 107 }
priyankapashte 0:e062501cfe81 108
priyankapashte 0:e062501cfe81 109 void TouchSensor::sliderRead(void ) {
priyankapashte 0:e062501cfe81 110 if(end_flag) {
priyankapashte 0:e062501cfe81 111 end_flag = 0;
priyankapashte 0:e062501cfe81 112 if((gu16Delta[0] > gu16Threshold[0])||(gu16Delta[1] > gu16Threshold[1])) {
priyankapashte 0:e062501cfe81 113 SliderPercentegePosition[0] = (gu16Delta[0]*100)/(gu16Delta[0]+gu16Delta[1]);
priyankapashte 0:e062501cfe81 114 SliderPercentegePosition[1] = (gu16Delta[1]*100)/(gu16Delta[0]+gu16Delta[1]);
priyankapashte 0:e062501cfe81 115 AbsolutePercentegePosition = ((100 - SliderPercentegePosition[0]) + SliderPercentegePosition[1])/2;
priyankapashte 0:e062501cfe81 116 } else {
priyankapashte 0:e062501cfe81 117 SliderPercentegePosition[0] = 0;
priyankapashte 0:e062501cfe81 118 SliderPercentegePosition[1] = 0;
priyankapashte 0:e062501cfe81 119 AbsolutePercentegePosition = 0;
priyankapashte 0:e062501cfe81 120 }
priyankapashte 0:e062501cfe81 121 }
priyankapashte 0:e062501cfe81 122 }
priyankapashte 0:e062501cfe81 123
priyankapashte 0:e062501cfe81 124 float TouchSensor::readPercentage() {
priyankapashte 0:e062501cfe81 125 sliderRead();
priyankapashte 0:e062501cfe81 126 return (float)AbsolutePercentegePosition/100.0;
priyankapashte 0:e062501cfe81 127 }
priyankapashte 0:e062501cfe81 128
priyankapashte 0:e062501cfe81 129
priyankapashte 0:e062501cfe81 130 uint16_t TouchSensor::readValue(uint8_t index)
priyankapashte 0:e062501cfe81 131 {
priyankapashte 0:e062501cfe81 132 return gu16TSICount[index];
priyankapashte 0:e062501cfe81 133 }
priyankapashte 0:e062501cfe81 134
priyankapashte 0:e062501cfe81 135 static void changeElectrode(void)
priyankapashte 0:e062501cfe81 136 {
priyankapashte 0:e062501cfe81 137 int16_t u16temp_delta;
priyankapashte 0:e062501cfe81 138
priyankapashte 0:e062501cfe81 139 gu16TSICount[ongoing_elec] = (TSI0->DATA & TSI_DATA_TSICNT_MASK); // Save Counts for current electrode
priyankapashte 0:e062501cfe81 140 u16temp_delta = gu16TSICount[ongoing_elec] - gu16Baseline[ongoing_elec]; // Obtains Counts Delta from callibration reference
priyankapashte 0:e062501cfe81 141 if(u16temp_delta < 0)
priyankapashte 0:e062501cfe81 142 gu16Delta[ongoing_elec] = 0;
priyankapashte 0:e062501cfe81 143 else
priyankapashte 0:e062501cfe81 144 gu16Delta[ongoing_elec] = u16temp_delta;
priyankapashte 0:e062501cfe81 145
priyankapashte 0:e062501cfe81 146 //Change Electrode to Scan
priyankapashte 0:e062501cfe81 147 if(total_electrode > 1)
priyankapashte 0:e062501cfe81 148 {
priyankapashte 0:e062501cfe81 149 if((total_electrode-1) > ongoing_elec)
priyankapashte 0:e062501cfe81 150 ongoing_elec++;
priyankapashte 0:e062501cfe81 151 else
priyankapashte 0:e062501cfe81 152 ongoing_elec = 0;
priyankapashte 0:e062501cfe81 153
priyankapashte 0:e062501cfe81 154 TSI0->DATA = ((elec_array[ongoing_elec]<<TSI_DATA_TSICH_SHIFT) );
priyankapashte 0:e062501cfe81 155 TSI0->DATA |= TSI_DATA_SWTS_MASK;
priyankapashte 0:e062501cfe81 156 }
priyankapashte 0:e062501cfe81 157 }
priyankapashte 0:e062501cfe81 158
priyankapashte 0:e062501cfe81 159 void tsi_irq(void)
priyankapashte 0:e062501cfe81 160 {
priyankapashte 0:e062501cfe81 161 end_flag = 1;
priyankapashte 0:e062501cfe81 162 TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
priyankapashte 0:e062501cfe81 163 changeElectrode();
priyankapashte 0:e062501cfe81 164 }