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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/>.
*
*/
#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
#include "../../../inc/MarlinConfig.h"
#if HAS_TFT_XPT2046 || HAS_TOUCH_BUTTONS
#include "xpt2046.h"
#include "pinconfig.h"
uint16_t delta(uint16_t a, uint16_t b) { return a > b ? a - b : b - a; }
SPI_HandleTypeDef XPT2046::SPIx;
void XPT2046::Init() {
SPI_TypeDef *spiInstance;
OUT_WRITE(TOUCH_CS_PIN, HIGH);
#if PIN_EXISTS(TOUCH_INT)
// Optional Pendrive interrupt pin
SET_INPUT(TOUCH_INT_PIN);
#endif
spiInstance = (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_SCK_PIN), PinMap_SPI_SCLK);
if (spiInstance != (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_MOSI_PIN), PinMap_SPI_MOSI)) spiInstance = NP;
if (spiInstance != (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_MISO_PIN), PinMap_SPI_MISO)) spiInstance = NP;
SPIx.Instance = spiInstance;
if (SPIx.Instance) {
SPIx.State = HAL_SPI_STATE_RESET;
SPIx.Init.NSS = SPI_NSS_SOFT;
SPIx.Init.Mode = SPI_MODE_MASTER;
SPIx.Init.Direction = SPI_DIRECTION_2LINES;
SPIx.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
SPIx.Init.CLKPhase = SPI_PHASE_2EDGE;
SPIx.Init.CLKPolarity = SPI_POLARITY_HIGH;
SPIx.Init.DataSize = SPI_DATASIZE_8BIT;
SPIx.Init.FirstBit = SPI_FIRSTBIT_MSB;
SPIx.Init.TIMode = SPI_TIMODE_DISABLE;
SPIx.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SPIx.Init.CRCPolynomial = 10;
pinmap_pinout(digitalPinToPinName(TOUCH_SCK_PIN), PinMap_SPI_SCLK);
pinmap_pinout(digitalPinToPinName(TOUCH_MOSI_PIN), PinMap_SPI_MOSI);
pinmap_pinout(digitalPinToPinName(TOUCH_MISO_PIN), PinMap_SPI_MISO);
#ifdef SPI1_BASE
if (SPIx.Instance == SPI1) {
__HAL_RCC_SPI1_CLK_ENABLE();
SPIx.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
}
#endif
#ifdef SPI2_BASE
if (SPIx.Instance == SPI2) {
__HAL_RCC_SPI2_CLK_ENABLE();
}
#endif
#ifdef SPI3_BASE
if (SPIx.Instance == SPI3) {
__HAL_RCC_SPI3_CLK_ENABLE();
}
#endif
}
else {
SPIx.Instance = nullptr;
SET_INPUT(TOUCH_MISO_PIN);
SET_OUTPUT(TOUCH_MOSI_PIN);
SET_OUTPUT(TOUCH_SCK_PIN);
}
getRawData(XPT2046_Z1);
}
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();
for (uint16_t i = 0; i < 3 ; i++) {
IO(coordinate);
data[i] = (IO() << 4) | (IO() >> 4);
}
DataTransferEnd();
uint16_t delta01 = delta(data[0], data[1]);
uint16_t delta02 = delta(data[0], data[2]);
uint16_t delta12 = delta(data[1], data[2]);
if (delta01 > delta02 || delta01 > delta12) {
if (delta02 > delta12)
data[0] = data[2];
else
data[1] = data[2];
}
return (data[0] + data[1]) >> 1;
}
uint16_t XPT2046::HardwareIO(uint16_t data) {
__HAL_SPI_ENABLE(&SPIx);
while ((SPIx.Instance->SR & SPI_FLAG_TXE) != SPI_FLAG_TXE) {}
SPIx.Instance->DR = data;
while ((SPIx.Instance->SR & SPI_FLAG_RXNE) != SPI_FLAG_RXNE) {}
__HAL_SPI_DISABLE(&SPIx);
return SPIx.Instance->DR;
}
uint16_t XPT2046::SoftwareIO(uint16_t data) {
uint16_t result = 0;
for (uint8_t j = 0x80; j > 0; j >>= 1) {
WRITE(TOUCH_SCK_PIN, LOW);
__DSB();
WRITE(TOUCH_MOSI_PIN, data & j ? HIGH : LOW);
__DSB();
if (READ(TOUCH_MISO_PIN)) result |= j;
__DSB();
WRITE(TOUCH_SCK_PIN, HIGH);
__DSB();
}
WRITE(TOUCH_SCK_PIN, LOW);
__DSB();
return result;
}
#endif // HAS_TFT_XPT2046
#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
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