diff options
Diffstat (limited to 'Marlin/src/HAL/STM32/tft/xpt2046.cpp')
| -rw-r--r-- | Marlin/src/HAL/STM32/tft/xpt2046.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/Marlin/src/HAL/STM32/tft/xpt2046.cpp b/Marlin/src/HAL/STM32/tft/xpt2046.cpp new file mode 100644 index 0000000..04294e6 --- /dev/null +++ b/Marlin/src/HAL/STM32/tft/xpt2046.cpp @@ -0,0 +1,170 @@ +/** + * 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 |