/******************************************************************/
//Touch_Sen.c	Rev 1.0	5/11/2016																		//
//Author: Ben Roloff																							//
//Purpose: Allow for reading of Touch Sensor											//
/******************************************************************/

#include "MKL46Z4.h"
#include "Touch_Sen.h"	

// TSI initialization function
void Touch_Init()
{
	// Enable clock for TSI PortB 16 and 17
	SIM->SCGC5 |= SIM_SCGC5_TSI_MASK;
	
	
	TSI0->GENCS = TSI_GENCS_OUTRGF_MASK |  // Out of range flag, set to 1 to clear
								//TSI_GENCS_ESOR_MASK |  // This is disabled to give an interrupt when out of range.  Enable to give an interrupt when end of scan
								TSI_GENCS_MODE(0u) |  // Set at 0 for capacitive sensing.  Other settings are 4 and 8 for threshold detection, and 12 for noise detection
								TSI_GENCS_REFCHRG(0u) | // 0-7 for Reference charge
								TSI_GENCS_DVOLT(0u) | // 0-3 sets the Voltage range
								TSI_GENCS_EXTCHRG(0u) | //0-7 for External charge
								TSI_GENCS_PS(0u) | // 0-7 for electrode prescaler
								TSI_GENCS_NSCN(31u) | // 0-31 + 1 for number of scans per electrode
								TSI_GENCS_TSIEN_MASK | // TSI enable bit
								//TSI_GENCS_TSIIEN_MASK | //TSI interrupt is disables
								TSI_GENCS_STPE_MASK | // Enables TSI in low power mode
								//TSI_GENCS_STM_MASK | // 0 for software trigger, 1 for hardware trigger
								//TSI_GENCS_SCNIP_MASK | // scan in progress flag
								TSI_GENCS_EOSF_MASK ; // End of scan flag, set to 1 to clear
								//TSI_GENCS_CURSW_MASK; // Do not swap current sources
	

	// The TSI threshold isn't used is in this application
//	TSI0->TSHD = 	TSI_TSHD_THRESH(0x00) |
//								TSI_TSHD_THRESL(0x00);

								
}

// Function to read touch sensor from low to high capacitance for left to right
int Touch_Scan_LH(void)
{
	int scan;
	TSI0->DATA = 	TSI_DATA_TSICH(10u); // Using channel 10 of The TSI
	TSI0->DATA |= TSI_DATA_SWTS_MASK; // Software trigger for scan
	scan = SCAN_DATA;
	TSI0->GENCS |= TSI_GENCS_EOSF_MASK ; // Reset end of scan flag
	
	return scan - SCAN_OFFSET;
}

// Function to read touch sensor from high to low capacitance for left to right
int Touch_Scan_HL(void)
{
	int scan;
	TSI0->DATA = 	TSI_DATA_TSICH(9u); // Using channel 9 of the TSI
	TSI0->DATA |= TSI_DATA_SWTS_MASK; // Software trigger for scan
	scan = SCAN_DATA;
	TSI0->GENCS |= TSI_GENCS_EOSF_MASK ; // Reset end of scan flag
	
	return scan - SCAN_OFFSET;
}