Bo-Jhang Ho
fastest sampling rate
Diff: TSI/TSISensor.cpp
- Revision:
- 0:459f1731fa6a
diff -r 000000000000 -r 459f1731fa6a TSI/TSISensor.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TSI/TSISensor.cpp Mon Feb 03 02:45:03 2014 +0000
@@ -0,0 +1,254 @@
+/* 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 3
+
+#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::TSISensor_reset(void) {
+ 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;
+}
+
+uint16_t TSISensor::readValue(uint8_t index)
+{
+ return gu16TSICount[index];
+}
+
+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();
+}