Support for TFT & Touch Screens (#18130)
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Alexander Gavrilenko
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185
Marlin/src/HAL/STM32/tft/xpt2046.cpp
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185
Marlin/src/HAL/STM32/tft/xpt2046.cpp
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/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "../../../inc/MarlinConfig.h"
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#if HAS_TFT_XPT2046
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#include "xpt2046.h"
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#include "pinconfig.h"
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uint16_t delta(uint16_t a, uint16_t b) { return a > b ? a - b : b - a; }
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SPI_HandleTypeDef XPT2046::SPIx;
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DMA_HandleTypeDef XPT2046::DMAtx;
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void XPT2046::Init() {
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SPI_TypeDef *spiInstance;
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OUT_WRITE(TOUCH_CS_PIN, HIGH);
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#if PIN_EXISTS(TOUCH_INT)
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// Optional Pendrive interrupt pin
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SET_INPUT(TOUCH_INT_PIN);
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#endif
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spiInstance = (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_SCK_PIN), PinMap_SPI_SCLK);
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if (spiInstance != (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_MOSI_PIN), PinMap_SPI_MOSI)) spiInstance = NP;
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if (spiInstance != (SPI_TypeDef *)pinmap_peripheral(digitalPinToPinName(TOUCH_MISO_PIN), PinMap_SPI_MISO)) spiInstance = NP;
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SPIx.Instance = spiInstance;
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if (SPIx.Instance) {
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SPIx.State = HAL_SPI_STATE_RESET;
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SPIx.Init.NSS = SPI_NSS_SOFT;
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SPIx.Init.Mode = SPI_MODE_MASTER;
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SPIx.Init.Direction = SPI_DIRECTION_2LINES;
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SPIx.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
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SPIx.Init.CLKPhase = SPI_PHASE_2EDGE;
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SPIx.Init.CLKPolarity = SPI_POLARITY_HIGH;
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SPIx.Init.DataSize = SPI_DATASIZE_8BIT;
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SPIx.Init.FirstBit = SPI_FIRSTBIT_MSB;
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SPIx.Init.TIMode = SPI_TIMODE_DISABLE;
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SPIx.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
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SPIx.Init.CRCPolynomial = 10;
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pinmap_pinout(digitalPinToPinName(TOUCH_SCK_PIN), PinMap_SPI_SCLK);
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pinmap_pinout(digitalPinToPinName(TOUCH_MOSI_PIN), PinMap_SPI_MOSI);
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pinmap_pinout(digitalPinToPinName(TOUCH_MISO_PIN), PinMap_SPI_MISO);
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#ifdef SPI1_BASE
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if (SPIx.Instance == SPI1) {
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__HAL_RCC_SPI1_CLK_ENABLE();
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SPIx.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
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#ifdef STM32F1xx
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DMAtx.Instance = DMA1_Channel3;
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#elif defined(STM32F4xx)
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DMAtx.Instance = DMA2_Stream3; // DMA2_Stream5
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#endif
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//SERIAL_ECHO_MSG(" Touch Screen on SPI1");
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}
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#endif
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#ifdef SPI2_BASE
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if (SPIx.Instance == SPI2) {
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__HAL_RCC_SPI2_CLK_ENABLE();
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#ifdef STM32F1xx
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DMAtx.Instance = DMA1_Channel5;
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#elif defined(STM32F4xx)
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DMAtx.Instance = DMA1_Stream4;
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#endif
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//SERIAL_ECHO_MSG(" Touch Screen on SPI2");
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}
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#endif
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#ifdef SPI3_BASE
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if (SPIx.Instance == SPI3) {
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__HAL_RCC_SPI3_CLK_ENABLE();
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#ifdef STM32F1xx
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DMAtx.Instance = DMA2_Channel2;
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#elif defined(STM32F4xx)
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DMAtx.Instance = DMA1_Stream5; // DMA1_Stream7
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#endif
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//SERIAL_ECHO_MSG(" Touch Screen on SPI3");
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}
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#endif
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}
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else {
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SPIx.Instance = NULL;
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SET_INPUT(TOUCH_MISO_PIN);
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SET_OUTPUT(TOUCH_MOSI_PIN);
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SET_OUTPUT(TOUCH_SCK_PIN);
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//SERIAL_ECHO_MSG(" Touch Screen on Software SPI");
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}
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getRawData(XPT2046_Z1);
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}
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bool XPT2046::isTouched() {
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return isBusy() ? false : (
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#if PIN_EXISTS(TOUCH_INT)
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READ(TOUCH_INT_PIN) != HIGH
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#else
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getRawData(XPT2046_Z1) >= XPT2046_Z1_THRESHOLD
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#endif
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);
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}
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bool XPT2046::getRawPoint(int16_t *x, int16_t *y) {
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if (isBusy()) return false;
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if (!isTouched()) return false;
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*x = getRawData(XPT2046_X);
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*y = getRawData(XPT2046_Y);
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return isTouched();
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}
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uint16_t XPT2046::getRawData(const XPTCoordinate coordinate) {
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uint16_t data[3];
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DataTransferBegin();
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for (uint16_t i = 0; i < 3 ; i++) {
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IO(coordinate);
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data[i] = (IO() << 4) | (IO() >> 4);
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}
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DataTransferEnd();
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uint16_t delta01 = delta(data[0], data[1]);
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uint16_t delta02 = delta(data[0], data[2]);
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uint16_t delta12 = delta(data[1], data[2]);
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if (delta01 > delta02 || delta01 > delta12) {
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if (delta02 > delta12)
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data[0] = data[2];
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else
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data[1] = data[2];
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}
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return (data[0] + data[1]) >> 1;
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}
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uint16_t XPT2046::HardwareIO(uint16_t data) {
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__HAL_SPI_ENABLE(&SPIx);
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while((SPIx.Instance->SR & SPI_FLAG_TXE) != SPI_FLAG_TXE) {}
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SPIx.Instance->DR = data;
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while((SPIx.Instance->SR & SPI_FLAG_RXNE) != SPI_FLAG_RXNE) {}
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__HAL_SPI_DISABLE(&SPIx);
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return SPIx.Instance->DR;
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}
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uint16_t XPT2046::SoftwareIO(uint16_t data) {
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uint16_t result = 0;
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for (uint8_t j = 0x80; j > 0; j >>= 1) {
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WRITE(TOUCH_SCK_PIN, LOW);
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__DSB();
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WRITE(TOUCH_MOSI_PIN, data & j ? HIGH : LOW);
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__DSB();
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if (READ(TOUCH_MISO_PIN)) result |= j;
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__DSB();
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WRITE(TOUCH_SCK_PIN, HIGH);
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__DSB();
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}
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WRITE(TOUCH_SCK_PIN, LOW);
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__DSB();
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return result;
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}
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#endif // HAS_TFT_XPT2046
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