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ugfx/drivers/ginput/touch/STMPE811/gmouse_lld_STMPE811.c

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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_GINPUT && GINPUT_NEED_MOUSE
#define GMOUSE_DRIVER_VMT GMOUSEVMT_STMPE811
#include "../../../../src/ginput/ginput_driver_mouse.h"
// Hardware definitions
#include "stmpe811.h"
// Get the hardware interface
#include "gmouse_lld_STMPE811_board.h"
// Extra settings for the users gfxconf.h file. See readme.txt
#ifndef GMOUSE_STMPE811_SELF_CALIBRATE
#define GMOUSE_STMPE811_SELF_CALIBRATE GFXOFF
#endif
#ifndef GMOUSE_STMPE811_READ_PRESSURE
#define GMOUSE_STMPE811_READ_PRESSURE GFXOFF
#endif
#ifndef GMOUSE_STMPE811_TEST_MODE
#define GMOUSE_STMPE811_TEST_MODE GFXOFF
#endif
/**
* Notes:
*
* This chip has some problems which required careful coding to overcome.
*
* The interrupt pin seems to be unreliable, at least on some boards, so we at most
* use the pin for filtering results to reduce cpu load.
* The symptoms are that readings will just stop due to the irq not being asserted
* even though there are items in the fifo. Another interrupt source such as a
* touch transition will restart the irq.
*
* There is no fifo entry created when a touch up event occurs. We must therefore
* generate a pseudo result on touch up. Fortunately the touch detection appears
* reliable and so we turn off the driver GMOUSE_VFLG_POORUPDOWN setting. In practice
* if touch is up we always return a pseudo event as this saves having to remember the
* previous touch state.
*
* Z readings range from around 90 (fully touched) to around 150 (on the verge of non-touched).
* Note the above is on the STM32F429i-Discovery board. Other boards may be different.
* To be conservative we use 255 as touch off, anything else is a touch on.
*
* GMOUSE_STMPE811_TEST_MODE is designed to be used with the "touch_raw_readings" tool which shows
* a steady stream of raw readings.
*
* Settings that may need tweaking on other hardware:
* The settling times. We have set these conservatively at 1ms.
* The reading window. We set this to 16 just to reduce noise. High-res panels may need a lower value.
*/
static gBool MouseInit(GMouse* m, unsigned driverinstance) {
if (!init_board(m, driverinstance))
return gFalse;
aquire_bus(m);
write_reg(m, STMPE811_REG_SYS_CTRL1, 0x02); // Software chip reset
gfxSleepMilliseconds(10);
write_reg(m, STMPE811_REG_SYS_CTRL2, 0x0C); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
#if GMOUSE_STMPE811_GPIO_IRQPIN
write_reg(m, STMPE811_REG_INT_EN, 0x03); // Interrupt on INT pin when there is a sample or a touch transition.
#else
write_reg(m, STMPE811_REG_INT_EN, 0x00); // Don't Interrupt on INT pin
#endif
write_reg(m, STMPE811_REG_ADC_CTRL1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
gfxSleepMilliseconds(2);
write_reg(m, STMPE811_REG_ADC_CTRL2, 0x01); // ADC speed 3.25MHz
write_reg(m, STMPE811_REG_GPIO_AF, 0x00); // GPIO alternate function - OFF
write_reg(m, STMPE811_REG_TSC_CFG, 0xA3); // Averaging 4, touch detect delay 1ms, panel driver settling time 1ms
write_reg(m, STMPE811_REG_FIFO_TH, 0x01); // FIFO threshold = 1
write_reg(m, STMPE811_REG_FIFO_STA, 0x01); // FIFO reset enable
write_reg(m, STMPE811_REG_FIFO_STA, 0x00); // FIFO reset disable
write_reg(m, STMPE811_REG_TSC_FRACT_XYZ, 0x07); // Z axis data format
write_reg(m, STMPE811_REG_TSC_I_DRIVE, 0x01); // max 50mA touchscreen line current
#if GMOUSE_STMPE811_READ_PRESSURE
write_reg(m, STMPE811_REG_TSC_CTRL, 0x30); // X&Y&Z, 16 reading window
write_reg(m, STMPE811_REG_TSC_CTRL, 0x31); // X&Y&Z, 16 reading window, TSC enable
#else
write_reg(m, STMPE811_REG_TSC_CTRL, 0x32); // X&Y, 16 reading window
write_reg(m, STMPE811_REG_TSC_CTRL, 0x33); // X&Y, 16 reading window, TSC enable
#endif
write_reg(m, STMPE811_REG_INT_STA, 0xFF); // Clear all interrupts
write_reg(m, STMPE811_REG_INT_CTRL, 0x01); // Level interrupt, enable interrupts
release_bus(m);
return gTrue;
}
static gBool read_xyz(GMouse* m, GMouseReading* pdr)
{
#if GMOUSE_STMPE811_TEST_MODE
static GMouseReading n;
#endif
uint8_t status;
// Button information will be regenerated
pdr->buttons = 0;
#if GMOUSE_STMPE811_TEST_MODE
aquire_bus(m);
// Set the buttons to match various touch signals
if ((read_byte(m, STMPE811_REG_TSC_CTRL) & 0x80))
pdr->buttons |= 0x02;
status = read_byte(m, STMPE811_REG_FIFO_STA);
if (!(status & 0x20))
pdr->buttons |= 0x04;
#if GMOUSE_STMPE811_GPIO_IRQPIN
if (getpin_irq(m))
pdr->buttons |= 0x08;
#endif
if ((status & 0x20)) {
// Nothing in the fifo - just return the last position and pressure
pdr->x = n.x;
pdr->y = n.y;
pdr->z = n.z;
#if GMOUSE_STMPE811_GPIO_IRQPIN
write_reg(m, STMPE811_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gTrue;
}
#else
// Is there a new sample or a touch transition
#if GMOUSE_STMPE811_GPIO_IRQPIN
if(!getpin_irq(m))
return gFalse;
#endif
// Is there something in the fifo
status = read_byte(m, STMPE811_REG_FIFO_STA);
if ((status & 0x20)) {
// Nothing in the fifo.
// If not touched return the pseudo result
if (!(read_byte(m, STMPE811_REG_TSC_CTRL) & 0x80)) {
pdr->z = gmvmt(m)->z_min;
#if GMOUSE_STMPE811_GPIO_IRQPIN
write_reg(m, STMPE811_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gTrue;
}
// No new result
#if GMOUSE_STMPE811_GPIO_IRQPIN
write_reg(m, STMPE811_REG_INT_STA, 0xFF);
#endif
release_bus(m);
return gFalse;
}
#endif
// Time to get some readings
pdr->x = (coord_t)read_word(m, STMPE811_REG_TSC_DATA_X);
pdr->y = (coord_t)read_word(m, STMPE811_REG_TSC_DATA_Y);
#if GMOUSE_STMPE811_READ_PRESSURE
pdr->z = (coord_t)read_byte(m, STMPE811_REG_TSC_DATA_Z);
#else
pdr->z = gmvmt(m)->z_max;
#endif
#if !GMOUSE_STMPE811_SLOW_CPU
if (!(status & 0xC0)) {
// Is there more data to come
if (!(read_byte(m, STMPE811_REG_FIFO_STA) & 0x20))
_gmouseWakeup(m);
} else
#endif
// Clear the rest of the fifo
{
write_reg(m, STMPE811_REG_FIFO_STA, 0x01); // FIFO reset enable
write_reg(m, STMPE811_REG_FIFO_STA, 0x00); // FIFO reset disable
}
// All done
#if GMOUSE_STMPE811_GPIO_IRQPIN
write_reg(m, STMPE811_REG_INT_STA, 0xFF);
#endif
release_bus(m);
#if GMOUSE_STMPE811_TEST_MODE
// Save the result for later
n.x = pdr->x;
n.y = pdr->y;
n.z = pdr->z;
#endif
// Rescale X,Y if we are using self-calibration
#if GMOUSE_STMPE811_SELF_CALIBRATE
#if GDISP_NEED_CONTROL
switch(gdispGGetOrientation(m->display)) {
default:
case GDISP_ROTATE_0:
case GDISP_ROTATE_180:
pdr->x = gdispGGetWidth(m->display) - pdr->x / (4096/gdispGGetWidth(m->display));
pdr->y = pdr->y / (4096/gdispGGetHeight(m->display));
break;
case GDISP_ROTATE_90:
case GDISP_ROTATE_270:
pdr->x = gdispGGetHeight(m->display) - pdr->x / (4096/gdispGGetHeight(m->display));
pdr->y = pdr->y / (4096/gdispGGetWidth(m->display));
break;
}
#else
pdr->x = gdispGGetWidth(m->display) - pdr->x / (4096/gdispGGetWidth(m->display));
pdr->y = pdr->y / (4096/gdispGGetHeight(m->display));
#endif
#endif
return gTrue;
}
const GMouseVMT const GMOUSE_DRIVER_VMT[1] = {{
{
GDRIVER_TYPE_TOUCH,
#if GMOUSE_STMPE811_SELF_CALIBRATE
GMOUSE_VFLG_TOUCH | GMOUSE_VFLG_ONLY_DOWN,
#else
GMOUSE_VFLG_TOUCH | GMOUSE_VFLG_ONLY_DOWN | GMOUSE_VFLG_CALIBRATE | GMOUSE_VFLG_CAL_TEST,
#endif
sizeof(GMouse) + GMOUSE_STMPE811_BOARD_DATA_SIZE,
_gmouseInitDriver,
_gmousePostInitDriver,
_gmouseDeInitDriver
},
0, // z_max - 0 indicates full touch
255, // z_min
150, // z_touchon
255, // z_touchoff
{ // pen_jitter
GMOUSE_STMPE811_PEN_CALIBRATE_ERROR, // calibrate
GMOUSE_STMPE811_PEN_CLICK_ERROR, // click
GMOUSE_STMPE811_PEN_MOVE_ERROR // move
},
{ // finger_jitter
GMOUSE_STMPE811_FINGER_CALIBRATE_ERROR, // calibrate
GMOUSE_STMPE811_FINGER_CLICK_ERROR, // click
GMOUSE_STMPE811_FINGER_MOVE_ERROR // move
},
MouseInit, // init
0, // deinit
read_xyz, // get
0, // calsave
0 // calload
}};
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
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