163 lines
5.1 KiB
C
163 lines
5.1 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file drivers/ginput/touch/STMPE811/ginput_lld_mouse.c
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* @brief GINPUT Touch low level driver source for the STMPE811.
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*
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* @defgroup Mouse Mouse
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* @ingroup GINPUT
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* @{
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*/
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#include "gfx.h"
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#include "stmpe811.h"
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#if (GFX_USE_GINPUT && GINPUT_NEED_MOUSE) /*|| defined(__DOXYGEN__)*/
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#include "ginput/lld/mouse.h"
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#include "ginput_lld_mouse_board.h"
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#ifndef STMP811_NO_GPIO_IRQPIN
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#define STMP811_NO_GPIO_IRQPIN FALSE
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#endif
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#ifndef STMP811_SLOW_CPU
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#define STMP811_SLOW_CPU FALSE
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#endif
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static coord_t x, y, z;
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static uint8_t touched;
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/* set the active window of the stmpe811. bl is bottom left, tr is top right */
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static void setActiveWindow(uint16_t bl_x, uint16_t bl_y, uint16_t tr_x, uint16_t tr_y)
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{
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write_reg(STMPE811_REG_WDW_TR_X, 2, tr_x);
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write_reg(STMPE811_REG_WDW_TR_Y, 2, tr_y);
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write_reg(STMPE811_REG_WDW_BL_X, 2, bl_x);
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write_reg(STMPE811_REG_WDW_BL_Y, 2, bl_y);
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}
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/**
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* @brief Initialise the mouse/touch.
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*
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* @notapi
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*/
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void ginput_lld_mouse_init(void)
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{
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init_board();
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write_reg(STMPE811_REG_SYS_CTRL1, 1, 0x02); // Software chip reset
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gfxSleepMilliseconds(10);
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write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
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#if STMP811_NO_GPIO_IRQPIN
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write_reg(STMPE811_REG_INT_EN, 1, 0x00); // Interrupt on INT pin when touch is detected
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#else
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write_reg(STMPE811_REG_INT_EN, 1, 0x01); // Interrupt on INT pin when touch is detected
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#endif
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write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
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gfxSleepMilliseconds(2);
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write_reg(STMPE811_REG_ADC_CTRL2, 1, 0x01); // ADC speed 3.25MHz
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write_reg(STMPE811_REG_GPIO_AF, 1, 0x00); // GPIO alternate function - OFF
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write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, touch detect delay 500 us, panel driver settling time 500 us
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write_reg(STMPE811_REG_FIFO_TH, 1, 0x40); // FIFO threshold = 64
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write_reg(STMPE811_REG_FIFO_STA, 1, 0x01); // FIFO reset enable
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write_reg(STMPE811_REG_FIFO_STA, 1, 0x00); // FIFO reset disable
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write_reg(STMPE811_REG_TSC_FRACT_XYZ, 1, 0x07); // Z axis data format
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write_reg(STMPE811_REG_TSC_I_DRIVE, 1, 0x01); // 50mA touchscreen line current
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write_reg(STMPE811_REG_TSC_CTRL, 1, 0x00); // X&Y&Z
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write_reg(STMPE811_REG_TSC_CTRL, 1, 0x01); // X&Y&Z, TSC enable
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write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
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#if !STMP811_NO_GPIO_IRQPIN
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touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80;
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#endif
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write_reg(STMPE811_REG_INT_CTRL, 1, 0x01); // Level interrupt, enable intrrupts
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}
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/**
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* @brief Read the mouse/touch position.
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*
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* @param[in] pt A pointer to the structure to fill
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*
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* @note For drivers that don't support returning a position
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* when the touch is up (most touch devices), it should
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* return the previous position with the new Z value.
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* The z value is the pressure for those touch devices
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* that support it (-100 to 100 where > 0 is touched)
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* or, 0 or 100 for those drivers that don't.
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*
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* @notapi
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*/
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void ginput_lld_mouse_get_reading(MouseReading *pt)
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{
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bool_t clearfifo; // Do we need to clear the FIFO
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#if STMP811_NO_GPIO_IRQPIN
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// Poll to get the touched status
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uint8_t last_touched;
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last_touched = touched;
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touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80;
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clearfifo = (touched != last_touched);
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#else
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// Check if the touch controller IRQ pin has gone off
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clearfifo = false;
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if(getpin_irq()) { // please rename this to getpin_irq
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write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // clear all interrupts
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touched = (uint8_t)read_reg(STMPE811_REG_TSC_CTRL, 1) & 0x80; // set the new touched status
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clearfifo = true; // only take the last FIFO reading
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}
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#endif
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// If not touched, return the previous results
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if (!touched) {
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pt->x = x;
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pt->y = y;
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pt->z = 0;
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pt->buttons = 0;
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return;
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}
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#if !STMP811_SLOW_CPU
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if (!clearfifo && (read_reg(STMPE811_REG_FIFO_STA, 1) & 0xD0))
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#endif
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clearfifo = true;
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do {
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/* Get the X, Y, Z values */
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/* This could be done in a single 4 byte read to STMPE811_REG_TSC_DATA_XYZ (incr or non-incr) */
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x = (coord_t)read_reg(STMPE811_REG_TSC_DATA_X, 2);
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y = (coord_t)read_reg(STMPE811_REG_TSC_DATA_Y, 2);
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z = (coord_t)read_reg(STMPE811_REG_TSC_DATA_Z, 1);
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} while(clearfifo && !(read_reg(STMPE811_REG_FIFO_STA, 1) & 0x20));
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// Rescale X,Y,Z - X & Y don't need scaling when you are using calibration!
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#if !GINPUT_MOUSE_NEED_CALIBRATION
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x = gdispGetWidth() - x / (4096/gdispGetWidth());
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y = y / (4096/gdispGetHeight());
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#endif
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z = (((z&0xFF) * 100)>>8) + 1;
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// Return the results. ADC gives values from 0 to 2^12 (4096)
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pt->x = x;
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pt->y = y;
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pt->z = z;
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pt->buttons = GINPUT_TOUCH_PRESSED;
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/* Force another read if we have more results */
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if (!clearfifo && !(read_reg(STMPE811_REG_FIFO_STA, 1) & 0x20))
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ginputMouseWakeup();
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}
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#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
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/** @} */
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