232 lines
7.8 KiB
C++
232 lines
7.8 KiB
C++
/* Freescale Semiconductor Inc.
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* (c) Copyright 2004-2005 Freescale Semiconductor, Inc.
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* (c) Copyright 2001-2004 Motorola, Inc.
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*
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* mbed Microcontroller Library
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* (c) Copyright 2009-2012 ARM Limited.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "mbed.h"
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#include "TSISensor.h"
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#define NO_TOUCH 0
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#define SLIDER_LENGTH 40 //LENGTH in mm
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#define TOTAL_ELECTRODE 2
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#define TSI0a 0
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#define TSI1 1
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#define TSI2 2
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#define TSI3 3
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#define TSI4 4
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#define TSI5 5
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#define TSI6 6
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#define TSI7 7
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#define TSI8 8
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#define TSI9 9
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#define TSI10 10
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#define TSI11 11
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#define TSI12 12
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#define TSI13 13
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#define TSI14 14
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#define TSI15 15
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/*Chose the correct TSI channel for the electrode number*/
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#define ELECTRODE0 TSI9
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#define ELECTRODE1 TSI10
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#define ELECTRODE2 TSI0a
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#define ELECTRODE3 TSI1
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#define ELECTRODE4 TSI2
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#define ELECTRODE5 TSI3
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#define ELECTRODE6 TSI4
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#define ELECTRODE7 TSI5
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#define ELECTRODE8 TSI6
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#define ELECTRODE9 TSI7
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#define ELECTRODE10 TSI8
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#define ELECTRODE11 TSI11
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#define ELECTRODE12 TSI12
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#define ELECTRODE13 TSI13
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#define ELECTRODE14 TSI14
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#define ELECTRODE15 TSI15
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#define THRESHOLD0 100
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#define THRESHOLD1 100
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#define THRESHOLD2 100
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#define THRESHOLD3 100
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#define THRESHOLD4 100
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#define THRESHOLD5 100
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#define THRESHOLD6 100
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#define THRESHOLD7 100
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#define THRESHOLD8 100
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#define THRESHOLD9 100
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#define THRESHOLD10 100
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#define THRESHOLD11 100
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#define THRESHOLD12 100
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#define THRESHOLD13 100
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#define THRESHOLD14 100
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#define THRESHOLD15 100
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static uint8_t total_electrode = TOTAL_ELECTRODE;
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static uint8_t elec_array[16]={ELECTRODE0,ELECTRODE1,ELECTRODE2,ELECTRODE3,ELECTRODE4,ELECTRODE5,
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ELECTRODE6,ELECTRODE7,ELECTRODE8,ELECTRODE9,ELECTRODE10,ELECTRODE11,
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ELECTRODE12,ELECTRODE13,ELECTRODE14,ELECTRODE15};
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static uint16_t gu16TSICount[16];
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static uint16_t gu16Baseline[16];
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static uint16_t gu16Threshold[16]={THRESHOLD0,THRESHOLD1,THRESHOLD2,THRESHOLD3,THRESHOLD4,THRESHOLD5,
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THRESHOLD6,THRESHOLD7,THRESHOLD8,THRESHOLD9,THRESHOLD10,THRESHOLD11,
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THRESHOLD12,THRESHOLD13,THRESHOLD14,THRESHOLD15};
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static uint16_t gu16Delta[16];
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static uint8_t ongoing_elec;
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static uint8_t end_flag = 1;
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static uint8_t SliderPercentegePosition[2] = {NO_TOUCH,NO_TOUCH};
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static uint8_t SliderDistancePosition[2] = {NO_TOUCH,NO_TOUCH};
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static uint32_t AbsolutePercentegePosition = NO_TOUCH;
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static uint32_t AbsoluteDistancePosition = NO_TOUCH;
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static void tsi_irq();
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TSISensor::TSISensor() {
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SIM->SCGC5 |= SIM_SCGC5_PORTB_MASK;
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SIM->SCGC5 |= SIM_SCGC5_TSI_MASK;
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TSI0->GENCS |= (TSI_GENCS_ESOR_MASK
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| TSI_GENCS_MODE(0)
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| TSI_GENCS_REFCHRG(4)
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| TSI_GENCS_DVOLT(0)
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| TSI_GENCS_EXTCHRG(7)
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| TSI_GENCS_PS(4)
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| TSI_GENCS_NSCN(11)
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| TSI_GENCS_TSIIEN_MASK
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| TSI_GENCS_STPE_MASK
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);
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TSI0->GENCS |= TSI_GENCS_TSIEN_MASK;
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NVIC_SetVector(TSI0_IRQn, (uint32_t)&tsi_irq);
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NVIC_EnableIRQ(TSI0_IRQn);
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selfCalibration();
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}
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void TSISensor::selfCalibration(void)
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{
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unsigned char cnt;
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unsigned char trigger_backup;
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TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
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TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
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if(TSI0->GENCS & TSI_GENCS_STM_MASK) // Back-up TSI Trigger mode from Application
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trigger_backup = 1;
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else
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trigger_backup = 0;
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TSI0->GENCS &= ~TSI_GENCS_STM_MASK; // Use SW trigger
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TSI0->GENCS &= ~TSI_GENCS_TSIIEN_MASK; // Enable TSI interrupts
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TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
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for(cnt=0; cnt < total_electrode; cnt++) // Get Counts when Electrode not pressed
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{
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TSI0->DATA = ((elec_array[cnt] << TSI_DATA_TSICH_SHIFT) );
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TSI0->DATA |= TSI_DATA_SWTS_MASK;
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while(!(TSI0->GENCS & TSI_GENCS_EOSF_MASK));
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TSI0->GENCS |= TSI_GENCS_EOSF_MASK;
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gu16Baseline[cnt] = (TSI0->DATA & TSI_DATA_TSICNT_MASK);
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}
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TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
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TSI0->GENCS |= TSI_GENCS_TSIIEN_MASK; // Enale TSI interrupt
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if(trigger_backup) // Restore trigger mode
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TSI0->GENCS |= TSI_GENCS_STM_MASK;
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else
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TSI0->GENCS &= ~TSI_GENCS_STM_MASK;
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TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
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TSI0->DATA = ((elec_array[0]<<TSI_DATA_TSICH_SHIFT) );
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TSI0->DATA |= TSI_DATA_SWTS_MASK;
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}
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void TSISensor::sliderRead(void ) {
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if(end_flag) {
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end_flag = 0;
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if((gu16Delta[0] > gu16Threshold[0])||(gu16Delta[1] > gu16Threshold[1])) {
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SliderPercentegePosition[0] = (gu16Delta[0]*100)/(gu16Delta[0]+gu16Delta[1]);
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SliderPercentegePosition[1] = (gu16Delta[1]*100)/(gu16Delta[0]+gu16Delta[1]);
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SliderDistancePosition[0] = (SliderPercentegePosition[0]* SLIDER_LENGTH)/100;
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SliderDistancePosition[1] = (SliderPercentegePosition[1]* SLIDER_LENGTH)/100;
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AbsolutePercentegePosition = ((100 - SliderPercentegePosition[0]) + SliderPercentegePosition[1])/2;
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AbsoluteDistancePosition = ((SLIDER_LENGTH - SliderDistancePosition[0]) + SliderDistancePosition[1])/2;
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} else {
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SliderPercentegePosition[0] = NO_TOUCH;
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SliderPercentegePosition[1] = NO_TOUCH;
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SliderDistancePosition[0] = NO_TOUCH;
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SliderDistancePosition[1] = NO_TOUCH;
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AbsolutePercentegePosition = NO_TOUCH;
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AbsoluteDistancePosition = NO_TOUCH;
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}
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}
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}
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float TSISensor::readPercentage() {
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sliderRead();
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return (float)AbsolutePercentegePosition/100.0;
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}
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uint8_t TSISensor::readDistance() {
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sliderRead();
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return AbsoluteDistancePosition;
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}
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static void changeElectrode(void)
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{
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int16_t u16temp_delta;
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gu16TSICount[ongoing_elec] = (TSI0->DATA & TSI_DATA_TSICNT_MASK); // Save Counts for current electrode
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u16temp_delta = gu16TSICount[ongoing_elec] - gu16Baseline[ongoing_elec]; // Obtains Counts Delta from callibration reference
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if(u16temp_delta < 0)
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gu16Delta[ongoing_elec] = 0;
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else
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gu16Delta[ongoing_elec] = u16temp_delta;
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//Change Electrode to Scan
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if(total_electrode > 1)
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{
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if((total_electrode-1) > ongoing_elec)
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ongoing_elec++;
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else
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ongoing_elec = 0;
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TSI0->DATA = ((elec_array[ongoing_elec]<<TSI_DATA_TSICH_SHIFT) );
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TSI0->DATA |= TSI_DATA_SWTS_MASK;
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}
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}
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void tsi_irq(void)
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{
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end_flag = 1;
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TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
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changeElectrode();
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}
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