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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 "../../platforms.h"
-
- #ifdef HAL_STM32
-
- #include "../../../inc/MarlinConfig.h"
-
- #if HAS_TFT_XPT2046 || HAS_RES_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 // HAL_STM32
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