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/* Freescale Semiconductor Inc.
* (c) Copyright 2004-2005 Freescale Semiconductor, Inc.
* (c) Copyright 2001-2004 Motorola, 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.
*/
#include "mbed.h"
#include "TSISensor.h"
#define NO_TOUCH 0
#define SLIDER_LENGTH 40 //LENGTH in mm
#define TOTAL_ELECTRODE 2
#define TSI0a 0
#define TSI1 1
#define TSI2 2
#define TSI3 3
#define TSI4 4
#define TSI5 5
#define TSI6 6
#define TSI7 7
#define TSI8 8
#define TSI9 9
#define TSI10 10
#define TSI11 11
#define TSI12 12
#define TSI13 13
#define TSI14 14
#define TSI15 15
/*Chose the correct TSI channel for the electrode number*/
#define ELECTRODE0 TSI9
#define ELECTRODE1 TSI10
#define ELECTRODE2 TSI0a
#define ELECTRODE3 TSI1
#define ELECTRODE4 TSI2
#define ELECTRODE5 TSI3
#define ELECTRODE6 TSI4
#define ELECTRODE7 TSI5
#define ELECTRODE8 TSI6
#define ELECTRODE9 TSI7
#define ELECTRODE10 TSI8
#define ELECTRODE11 TSI11
#define ELECTRODE12 TSI12
#define ELECTRODE13 TSI13
#define ELECTRODE14 TSI14
#define ELECTRODE15 TSI15
#define THRESHOLD0 100
#define THRESHOLD1 100
#define THRESHOLD2 100
#define THRESHOLD3 100
#define THRESHOLD4 100
#define THRESHOLD5 100
#define THRESHOLD6 100
#define THRESHOLD7 100
#define THRESHOLD8 100
#define THRESHOLD9 100
#define THRESHOLD10 100
#define THRESHOLD11 100
#define THRESHOLD12 100
#define THRESHOLD13 100
#define THRESHOLD14 100
#define THRESHOLD15 100
static uint8_t total_electrode = TOTAL_ELECTRODE;
static uint8_t elec_array[16]={ELECTRODE0,ELECTRODE1,ELECTRODE2,ELECTRODE3,ELECTRODE4,ELECTRODE5,
ELECTRODE6,ELECTRODE7,ELECTRODE8,ELECTRODE9,ELECTRODE10,ELECTRODE11,
ELECTRODE12,ELECTRODE13,ELECTRODE14,ELECTRODE15};
static uint16_t gu16TSICount[16];
static uint16_t gu16Baseline[16];
static uint16_t gu16Threshold[16]={THRESHOLD0,THRESHOLD1,THRESHOLD2,THRESHOLD3,THRESHOLD4,THRESHOLD5,
THRESHOLD6,THRESHOLD7,THRESHOLD8,THRESHOLD9,THRESHOLD10,THRESHOLD11,
THRESHOLD12,THRESHOLD13,THRESHOLD14,THRESHOLD15};
static uint16_t gu16Delta[16];
static uint8_t ongoing_elec;
static uint8_t end_flag = 1;
static uint8_t SliderPercentegePosition[2] = {NO_TOUCH,NO_TOUCH};
static uint8_t SliderDistancePosition[2] = {NO_TOUCH,NO_TOUCH};
static uint32_t AbsolutePercentegePosition = NO_TOUCH;
static uint32_t AbsoluteDistancePosition = NO_TOUCH;
static void tsi_irq();
TSISensor::TSISensor() {
SIM->SCGC5 |= SIM_SCGC5_PORTB_MASK;
SIM->SCGC5 |= SIM_SCGC5_TSI_MASK;
TSI0->GENCS |= (TSI_GENCS_ESOR_MASK
| TSI_GENCS_MODE(0)
| TSI_GENCS_REFCHRG(4)
| TSI_GENCS_DVOLT(0)
| TSI_GENCS_EXTCHRG(7)
| TSI_GENCS_PS(4)
| TSI_GENCS_NSCN(11)
| TSI_GENCS_TSIIEN_MASK
| TSI_GENCS_STPE_MASK
);
TSI0->GENCS |= TSI_GENCS_TSIEN_MASK;
NVIC_SetVector(TSI0_IRQn, (uint32_t)&tsi_irq);
NVIC_EnableIRQ(TSI0_IRQn);
selfCalibration();
}
void TSISensor::selfCalibration(void)
{
unsigned char cnt;
unsigned char trigger_backup;
TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
if(TSI0->GENCS & TSI_GENCS_STM_MASK) // Back-up TSI Trigger mode from Application
trigger_backup = 1;
else
trigger_backup = 0;
TSI0->GENCS &= ~TSI_GENCS_STM_MASK; // Use SW trigger
TSI0->GENCS &= ~TSI_GENCS_TSIIEN_MASK; // Enable TSI interrupts
TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
for(cnt=0; cnt < total_electrode; cnt++) // Get Counts when Electrode not pressed
{
TSI0->DATA = ((elec_array[cnt] << TSI_DATA_TSICH_SHIFT) );
TSI0->DATA |= TSI_DATA_SWTS_MASK;
while(!(TSI0->GENCS & TSI_GENCS_EOSF_MASK));
TSI0->GENCS |= TSI_GENCS_EOSF_MASK;
gu16Baseline[cnt] = (TSI0->DATA & TSI_DATA_TSICNT_MASK);
}
TSI0->GENCS &= ~TSI_GENCS_TSIEN_MASK; // Disable TSI module
TSI0->GENCS |= TSI_GENCS_TSIIEN_MASK; // Enale TSI interrupt
if(trigger_backup) // Restore trigger mode
TSI0->GENCS |= TSI_GENCS_STM_MASK;
else
TSI0->GENCS &= ~TSI_GENCS_STM_MASK;
TSI0->GENCS |= TSI_GENCS_TSIEN_MASK; // Enable TSI module
TSI0->DATA = ((elec_array[0]<<TSI_DATA_TSICH_SHIFT) );
TSI0->DATA |= TSI_DATA_SWTS_MASK;
}
void TSISensor::sliderRead(void ) {
if(end_flag) {
end_flag = 0;
if((gu16Delta[0] > gu16Threshold[0])||(gu16Delta[1] > gu16Threshold[1])) {
SliderPercentegePosition[0] = (gu16Delta[0]*100)/(gu16Delta[0]+gu16Delta[1]);
SliderPercentegePosition[1] = (gu16Delta[1]*100)/(gu16Delta[0]+gu16Delta[1]);
SliderDistancePosition[0] = (SliderPercentegePosition[0]* SLIDER_LENGTH)/100;
SliderDistancePosition[1] = (SliderPercentegePosition[1]* SLIDER_LENGTH)/100;
AbsolutePercentegePosition = ((100 - SliderPercentegePosition[0]) + SliderPercentegePosition[1])/2;
AbsoluteDistancePosition = ((SLIDER_LENGTH - SliderDistancePosition[0]) + SliderDistancePosition[1])/2;
} else {
SliderPercentegePosition[0] = NO_TOUCH;
SliderPercentegePosition[1] = NO_TOUCH;
SliderDistancePosition[0] = NO_TOUCH;
SliderDistancePosition[1] = NO_TOUCH;
AbsolutePercentegePosition = NO_TOUCH;
AbsoluteDistancePosition = NO_TOUCH;
}
}
}
float TSISensor::readPercentage() {
sliderRead();
return (float)AbsolutePercentegePosition/100.0;
}
uint8_t TSISensor::readDistance() {
sliderRead();
return AbsoluteDistancePosition;
}
static void changeElectrode(void)
{
int16_t u16temp_delta;
gu16TSICount[ongoing_elec] = (TSI0->DATA & TSI_DATA_TSICNT_MASK); // Save Counts for current electrode
u16temp_delta = gu16TSICount[ongoing_elec] - gu16Baseline[ongoing_elec]; // Obtains Counts Delta from callibration reference
if(u16temp_delta < 0)
gu16Delta[ongoing_elec] = 0;
else
gu16Delta[ongoing_elec] = u16temp_delta;
//Change Electrode to Scan
if(total_electrode > 1)
{
if((total_electrode-1) > ongoing_elec)
ongoing_elec++;
else
ongoing_elec = 0;
TSI0->DATA = ((elec_array[ongoing_elec]<<TSI_DATA_TSICH_SHIFT) );
TSI0->DATA |= TSI_DATA_SWTS_MASK;
}
}
void tsi_irq(void)
{
end_flag = 1;
TSI0->GENCS |= TSI_GENCS_EOSF_MASK; // Clear End of Scan Flag
changeElectrode();
}
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