bissen21/Marlin_Firmware
1
0
Fork 0
Code Issues Pull Requests Projects Releases 4 Wiki Activity
Marlin_Firmware/Marlin/src/feature/touch/xpt2046.cpp

249 lines
8.1 KiB
C++
Raw Blame History

/**
* Marlin 3D Printer Firmware
* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* 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/MarlinConfigPre.h"
#if ENABLED(TOUCH_BUTTONS)
#include "xpt2046.h"
#include "../../inc/MarlinConfig.h"
#if TFT_SCALED_DOGLCD
#include "../../lcd/dogm/ultralcd_DOGM.h" // for LCD_FULL_PIXEL_WIDTH, etc.
#endif
#ifndef XPT2046_Z1_THRESHOLD
#define XPT2046_Z1_THRESHOLD 10
#endif
/*
* Draw and Touch processing
*
* LCD_PIXEL_WIDTH/HEIGHT (128x64) is the (emulated DOGM) Pixel Drawing resolution.
* TOUCH_SCREEN_WIDTH/HEIGHT (320x240) is the Touch Area resolution.
* LCD_FULL_PIXEL_WIDTH/HEIGHT (320x240 or 480x320) is the Actual (FSMC) Display resolution.
*
* - All native (u8g) drawing is done in LCD_PIXEL_* (128x64)
* - The DOGM pixels are is upscaled 2-3x (as needed) for display.
* - Touch coordinates use TOUCH_SCREEN_* resolution and are converted to
* click and scroll-wheel events (emulating of a common DOGM display).
*
* TOUCH_SCREEN resolution exists to fit our calibration values. The original touch code was made
* and originally calibrated for 320x240. If you decide to change the resolution of the touch code,
* new calibration values will be needed.
*
* The Marlin menus are drawn scaled in the upper region of the screen. The bottom region (in a
* fixed location in TOUCH_SCREEN* coordinate space) is used for 4 general-purpose buttons to
* navigate and select menu items. Both regions are touchable.
*
* The Marlin screen touchable area starts at LCD_PIXEL_OFFSET_X/Y (translated to SCREEN_START_LEFT/TOP)
* and spans LCD_PIXEL_WIDTH/HEIGHT (scaled to SCREEN_WIDTH/HEIGHT).
*/
// Touch screen resolution independent of display resolution
#define TOUCH_SCREEN_HEIGHT 240
#define TOUCH_SCREEN_WIDTH 320
// Coordinates in terms of touch area
#define BUTTON_AREA_TOP 175
#define BUTTON_AREA_BOT 234
#define SCREEN_START_TOP ((LCD_PIXEL_OFFSET_Y) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
#define SCREEN_START_LEFT ((LCD_PIXEL_OFFSET_X) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
#define SCREEN_HEIGHT ((LCD_PIXEL_HEIGHT * FSMC_UPSCALE) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
#define SCREEN_WIDTH ((LCD_PIXEL_WIDTH * FSMC_UPSCALE) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
#define TOUCHABLE_Y_HEIGHT SCREEN_HEIGHT
#define TOUCHABLE_X_WIDTH SCREEN_WIDTH
#ifndef TOUCH_INT_PIN
#define TOUCH_INT_PIN -1
#endif
#ifndef TOUCH_MISO_PIN
#define TOUCH_MISO_PIN MISO_PIN
#endif
#ifndef TOUCH_MOSI_PIN
#define TOUCH_MOSI_PIN MOSI_PIN
#endif
#ifndef TOUCH_SCK_PIN
#define TOUCH_SCK_PIN SCK_PIN
#endif
#ifndef TOUCH_CS_PIN
#define TOUCH_CS_PIN CS_PIN
#endif
XPT2046 touch;
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
// Read once to enable pendrive status pin
getInTouch(XPT2046_X);
}
#include "../../lcd/ultralcd.h" // For EN_C bit mask
uint8_t XPT2046::read_buttons() {
#ifdef HAS_SPI_LCD
int16_t tsoffsets[4] = { 0 };
if (tsoffsets[0] + tsoffsets[1] == 0) {
// Not yet set, so use defines as fallback...
tsoffsets[0] = XPT2046_X_CALIBRATION;
tsoffsets[1] = XPT2046_X_OFFSET;
tsoffsets[2] = XPT2046_Y_CALIBRATION;
tsoffsets[3] = XPT2046_Y_OFFSET;
}
// We rely on XPT2046 compatible mode to ADS7843, hence no Z1 and Z2 measurements possible.
if (!isTouched()) return 0;
uint16_t x = uint16_t(((uint32_t(getInTouch(XPT2046_X))) * tsoffsets[0]) >> 16) + tsoffsets[1],
y = uint16_t(((uint32_t(getInTouch(XPT2046_Y))) * tsoffsets[2]) >> 16) + tsoffsets[3];
if (!isTouched()) return 0; // Fingers must still be on the TS for a valid read.
#if ENABLED(GRAPHICAL_TFT_ROTATE_180)
x = TOUCH_SCREEN_WIDTH - x;
y = TOUCH_SCREEN_HEIGHT - y;
#endif
// Touch within the button area simulates an encoder button
if (y > BUTTON_AREA_TOP && y < BUTTON_AREA_BOT)
return WITHIN(x, 14, 77) ? EN_D
: WITHIN(x, 90, 153) ? EN_A
: WITHIN(x, 166, 229) ? EN_B
: WITHIN(x, 242, 305) ? EN_C
: 0;
if (x > TOUCH_SCREEN_WIDTH || !WITHIN(y, SCREEN_START_TOP, SCREEN_START_TOP + SCREEN_HEIGHT)) return 0;
// Column and row above BUTTON_AREA_TOP
int8_t col = (x - (SCREEN_START_LEFT)) * (LCD_WIDTH) / (TOUCHABLE_X_WIDTH),
row = (y - (SCREEN_START_TOP)) * (LCD_HEIGHT) / (TOUCHABLE_Y_HEIGHT);
// Send the touch to the UI (which will simulate the encoder wheel)
MarlinUI::screen_click(row, col, x, y);
#endif
return 0;
}
bool XPT2046::isTouched() {
return (
#if PIN_EXISTS(TOUCH_INT)
READ(TOUCH_INT_PIN) != HIGH
#else
getInTouch(XPT2046_Z1) >= XPT2046_Z1_THRESHOLD
#endif
);
}
#if ENABLED(TOUCH_BUTTONS_HW_SPI)
#include <SPI.h>
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
}
SPI.setModule(TOUCH_BUTTONS_HW_SPI_DEVICE);
SPI.begin();
SPI.setClockDivider(clock);
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
}
#endif // TOUCH_BUTTONS_HW_SPI
uint16_t XPT2046::getInTouch(const XPTCoordinate coordinate) {
uint16_t data[3];
const uint8_t coord = uint8_t(coordinate) | XPT2046_CONTROL | XPT2046_DFR_MODE;
#if ENABLED(TOUCH_BUTTONS_HW_SPI)
touch_spi_init(SPI_SPEED_6);
for (uint16_t i = 0; i < 3; i++) {
OUT_WRITE(TOUCH_CS_PIN, LOW);
SPI.transfer(coord);
data[i] = (((SPI.transfer(0xFF) << 8) | SPI.transfer(0xFF)) >> 3) & 0x0FFF;
WRITE(TOUCH_CS_PIN, HIGH);
}
#else // !TOUCH_BUTTONS_HW_SPI
OUT_WRITE(TOUCH_CS_PIN, LOW);
for (uint16_t i = 0; i < 3; i++) {
for (uint8_t j = 0x80; j; j >>= 1) {
WRITE(TOUCH_SCK_PIN, LOW);
WRITE(TOUCH_MOSI_PIN, bool(coord & j));
WRITE(TOUCH_SCK_PIN, HIGH);
}
data[i] = 0;
for (uint16_t j = 0x8000; j; j >>= 1) {
WRITE(TOUCH_SCK_PIN, LOW);
if (READ(TOUCH_MISO_PIN)) data[i] |= j;
WRITE(TOUCH_SCK_PIN, HIGH);
}
WRITE(TOUCH_SCK_PIN, LOW);
data[i] >>= 4;
}
WRITE(TOUCH_CS_PIN, HIGH);
#endif // !TOUCH_BUTTONS_HW_SPI
uint16_t delta01 = _MAX(data[0], data[1]) - _MIN(data[0], data[1]),
delta02 = _MAX(data[0], data[2]) - _MIN(data[0], data[2]),
delta12 = _MAX(data[1], data[2]) - _MIN(data[1], data[2]);
if (delta01 <= delta02 && delta01 <= delta12)
return (data[0] + data[1]) >> 1;
if (delta02 <= delta12)
return (data[0] + data[2]) >> 1;
return (data[1] + data[2]) >> 1;
}
bool XPT2046::getTouchPoint(uint16_t &x, uint16_t &y) {
if (isTouched()) {
x = getInTouch(XPT2046_X);
y = getInTouch(XPT2046_Y);
}
return isTouched();
}
#endif // TOUCH_BUTTONS
Reference in New Issue View Git Blame Copy Permalink