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/**
* Marlin 3D Printer Firmware
* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include "../../../inc/MarlinConfig.h"
#if HAS_TFT_XPT2046 || HAS_TOUCH_BUTTONS
#include "xpt2046.h"
#include <SPI.h>
uint16_t delta(uint16_t a, uint16_t b) { return a > b ? a - b : b - a; }
#if ENABLED(TOUCH_BUTTONS_HW_SPI)
#include <SPI.h>
SPIClass XPT2046::SPIx(TOUCH_BUTTONS_HW_SPI_DEVICE);
static void touch_spi_init(uint8_t spiRate) {
/**
* STM32F1 APB2 = 72MHz, APB1 = 36MHz, max SPI speed of this MCU if 18Mhz
* STM32F1 has 3 SPI ports, SPI1 in APB2, SPI2/SPI3 in APB1
* so the minimum prescale of SPI1 is DIV4, SPI2/SPI3 is DIV2
*/
uint8_t clock;
switch (spiRate) {
case SPI_FULL_SPEED: clock = SPI_CLOCK_DIV4; break;
case SPI_HALF_SPEED: clock = SPI_CLOCK_DIV4; break;
case SPI_QUARTER_SPEED: clock = SPI_CLOCK_DIV8; break;
case SPI_EIGHTH_SPEED: clock = SPI_CLOCK_DIV16; break;
case SPI_SPEED_5: clock = SPI_CLOCK_DIV32; break;
case SPI_SPEED_6: clock = SPI_CLOCK_DIV64; break;
default: clock = SPI_CLOCK_DIV2; // Default from the SPI library
}
XPT2046::SPIx.setModule(TOUCH_BUTTONS_HW_SPI_DEVICE);
XPT2046::SPIx.setClockDivider(clock);
XPT2046::SPIx.setBitOrder(MSBFIRST);
XPT2046::SPIx.setDataMode(SPI_MODE0);
}
#endif // TOUCH_BUTTONS_HW_SPI
void XPT2046::Init() {
SET_INPUT(TOUCH_MISO_PIN);
SET_OUTPUT(TOUCH_MOSI_PIN);
SET_OUTPUT(TOUCH_SCK_PIN);
OUT_WRITE(TOUCH_CS_PIN, HIGH);
#if PIN_EXISTS(TOUCH_INT)
// Optional Pendrive interrupt pin
SET_INPUT(TOUCH_INT_PIN);
#endif
TERN_(TOUCH_BUTTONS_HW_SPI, touch_spi_init(SPI_SPEED_6));
// Read once to enable pendrive status pin
getRawData(XPT2046_X);
}
bool XPT2046::isTouched() {
return isBusy() ? false : (
#if PIN_EXISTS(TOUCH_INT)
READ(TOUCH_INT_PIN) != HIGH
#else
getRawData(XPT2046_Z1) >= XPT2046_Z1_THRESHOLD
#endif
);
}
bool XPT2046::getRawPoint(int16_t *x, int16_t *y) {
if (isBusy()) return false;
if (!isTouched()) return false;
*x = getRawData(XPT2046_X);
*y = getRawData(XPT2046_Y);
return isTouched();
}
uint16_t XPT2046::getRawData(const XPTCoordinate coordinate) {
uint16_t data[3];
DataTransferBegin();
TERN_(TOUCH_BUTTONS_HW_SPI, SPIx.begin());
for (uint16_t i = 0; i < 3 ; i++) {
IO(coordinate);
data[i] = (IO() << 4) | (IO() >> 4);
}
TERN_(TOUCH_BUTTONS_HW_SPI, SPIx.end());
DataTransferEnd();
uint16_t delta01 = delta(data[0], data[1]),
delta02 = delta(data[0], data[2]),
delta12 = delta(data[1], data[2]);
if (delta01 > delta02 || delta01 > delta12)
data[delta02 > delta12 ? 0 : 1] = data[2];
return (data[0] + data[1]) >> 1;
}
uint16_t XPT2046::IO(uint16_t data) {
return TERN(TOUCH_BUTTONS_HW_SPI, HardwareIO, SoftwareIO)(data);
}
#if ENABLED(TOUCH_BUTTONS_HW_SPI)
uint16_t XPT2046::HardwareIO(uint16_t data) {
uint16_t result = SPIx.transfer(data);
return result;
}
#endif
uint16_t XPT2046::SoftwareIO(uint16_t data) {
uint16_t result = 0;
for (uint8_t j = 0x80; j; j >>= 1) {
WRITE(TOUCH_SCK_PIN, LOW);
WRITE(TOUCH_MOSI_PIN, data & j ? HIGH : LOW);
if (READ(TOUCH_MISO_PIN)) result |= j;
WRITE(TOUCH_SCK_PIN, HIGH);
}
WRITE(TOUCH_SCK_PIN, LOW);
return result;
}
#endif // HAS_TFT_XPT2046
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