120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* Teensyduino Core Library
|
|
* http://www.pjrc.com/teensy/
|
|
* Copyright (c) 2017 PJRC.COM, LLC.
|
|
*
|
|
* 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:
|
|
*
|
|
* 1. The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* 2. If the Software is incorporated into a build system that allows
|
|
* selection among a list of target devices, then similar target
|
|
* devices manufactured by PJRC.COM must be included in the list of
|
|
* target devices and selectable in the same manner.
|
|
*
|
|
* 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 "core_pins.h"
|
|
//#include "HardwareSerial.h"
|
|
|
|
#if defined(HAS_KINETIS_TSI) || defined(HAS_KINETIS_TSI_LITE)
|
|
|
|
#if defined(__MK20DX128__) || defined(__MK20DX256__)
|
|
// These settings give approx 0.02 pF sensitivity and 1200 pF range
|
|
// Lower current, higher number of scans, and higher prescaler
|
|
// increase sensitivity, but the trade-off is longer measurement
|
|
// time and decreased range.
|
|
#define CURRENT 2 // 0 to 15 - current to use, value is 2*(current+1)
|
|
#define NSCAN 9 // number of times to scan, 0 to 31, value is nscan+1
|
|
#define PRESCALE 2 // prescaler, 0 to 7 - value is 2^(prescaler+1)
|
|
static const uint8_t pin2tsi[] = {
|
|
//0 1 2 3 4 5 6 7 8 9
|
|
9, 10, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 13, 0, 6, 8, 7,
|
|
255, 255, 14, 15, 255, 12, 255, 255, 255, 255,
|
|
255, 255, 11, 5
|
|
};
|
|
|
|
#elif defined(__MK66FX1M0__)
|
|
#define NSCAN 9
|
|
#define PRESCALE 2
|
|
static const uint8_t pin2tsi[] = {
|
|
//0 1 2 3 4 5 6 7 8 9
|
|
9, 10, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 13, 0, 6, 8, 7,
|
|
255, 255, 14, 15, 255, 255, 255, 255, 255, 11,
|
|
12, 255, 255, 255, 255, 255, 255, 255, 255, 255
|
|
};
|
|
|
|
#elif defined(__MKL26Z64__)
|
|
#define NSCAN 9
|
|
#define PRESCALE 2
|
|
static const uint8_t pin2tsi[] = {
|
|
//0 1 2 3 4 5 6 7 8 9
|
|
9, 10, 255, 2, 3, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 13, 0, 6, 8, 7,
|
|
255, 255, 14, 15, 255, 255, 255
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
// output is approx pF * 50
|
|
// time to measure 33 pF is approx 0.25 ms
|
|
// time to measure 1000 pF is approx 4.5 ms
|
|
|
|
int touchRead(uint8_t pin)
|
|
{
|
|
uint32_t ch;
|
|
|
|
if (pin >= NUM_DIGITAL_PINS) return 0;
|
|
ch = pin2tsi[pin];
|
|
if (ch == 255) return 0;
|
|
|
|
*portConfigRegister(pin) = PORT_PCR_MUX(0);
|
|
SIM_SCGC5 |= SIM_SCGC5_TSI;
|
|
#if defined(HAS_KINETIS_TSI)
|
|
TSI0_GENCS = 0;
|
|
TSI0_PEN = (1 << ch);
|
|
TSI0_SCANC = TSI_SCANC_REFCHRG(3) | TSI_SCANC_EXTCHRG(CURRENT);
|
|
TSI0_GENCS = TSI_GENCS_NSCN(NSCAN) | TSI_GENCS_PS(PRESCALE) | TSI_GENCS_TSIEN | TSI_GENCS_SWTS;
|
|
delayMicroseconds(10);
|
|
while (TSI0_GENCS & TSI_GENCS_SCNIP) ; // wait
|
|
delayMicroseconds(1);
|
|
return *((volatile uint16_t *)(&TSI0_CNTR1) + ch);
|
|
#elif defined(HAS_KINETIS_TSI_LITE)
|
|
TSI0_GENCS = TSI_GENCS_REFCHRG(4) | TSI_GENCS_EXTCHRG(3) | TSI_GENCS_PS(PRESCALE)
|
|
| TSI_GENCS_NSCN(NSCAN) | TSI_GENCS_TSIEN | TSI_GENCS_EOSF;
|
|
TSI0_DATA = TSI_DATA_TSICH(ch) | TSI_DATA_SWTS;
|
|
delayMicroseconds(10);
|
|
while (TSI0_GENCS & TSI_GENCS_SCNIP) ; // wait
|
|
delayMicroseconds(1);
|
|
return TSI0_DATA & 0xFFFF;
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
|
|
int touchRead(uint8_t pin)
|
|
{
|
|
return 0; // no Touch sensing :(
|
|
}
|
|
|
|
#endif
|
|
|
|
|