194 lines
6.1 KiB
C
194 lines
6.1 KiB
C
/*
|
|
* 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_MAX11802
|
|
#include "src/ginput/driver_mouse.h"
|
|
|
|
// Hardware definitions
|
|
#include "drivers/ginput/touch/MAX11802/max11802.h"
|
|
|
|
// Get the hardware interface
|
|
#include "gmouse_lld_MAX11802_board.h"
|
|
|
|
// Register values to set
|
|
#define MAX11802_MODE 0x0E // Direct conversion with averaging
|
|
#define MAX11802_AVG 0x55
|
|
#define MAX11802_TIMING 0x77
|
|
#define MAX11802_DELAY 0x55
|
|
|
|
#define Z_MIN 0
|
|
#define Z_MAX 1
|
|
|
|
static bool_t MouseInit(GMouse* m, unsigned driverinstance)
|
|
{
|
|
const uint8_t *p;
|
|
|
|
static const uint8_t commandList[] = {
|
|
MAX11802_CMD_GEN_WR, 0xf0, // General config - leave TIRQ enabled, even though we ignore it ATM
|
|
MAX11802_CMD_RES_WR, 0x00, // A-D resolution, hardware config - rewriting default; all 12-bit resolution
|
|
MAX11802_CMD_AVG_WR, MAX11802_AVG, // A-D averaging - 8 samples, average four median samples
|
|
MAX11802_CMD_SAMPLE_WR, 0x00, // A-D sample time - use default
|
|
MAX11802_CMD_TIMING_WR, MAX11802_TIMING, // Setup timing
|
|
MAX11802_CMD_DELAY_WR, MAX11802_DELAY, // Conversion delays
|
|
MAX11802_CMD_TDPULL_WR, 0x00, // A-D resolution, hardware config - rewrite default
|
|
// MAX11802_CMD_MDTIM_WR, 0x00, // Autonomous mode timing - write default - only for MAX11800, MAX11801
|
|
// MAX11802_CMD_APCONF_WR, 0x00, // Aperture config register - rewrite default - only for MAX11800, MAX11801
|
|
// Ignore aux config register - not used
|
|
MAX11802_CMD_MODE_WR, MAX11802_MODE // Set mode last
|
|
};
|
|
|
|
if (!init_board(m, driverinstance))
|
|
return FALSE;
|
|
|
|
aquire_bus(m);
|
|
for (p = commandList; p < commandList+sizeof(commandList); p += 2)
|
|
write_command(m, p[0], p[1]);
|
|
release_bus(m); // Need to release bus after each access to reset interface in chip
|
|
// (and in some cases, to allow sharing of SPI bus if board logic/OS manages it)
|
|
// Setup complete here
|
|
|
|
|
|
// Read something as a test
|
|
aquire_bus(m);
|
|
if (write_command(m, MAX11802_CMD_MODE_RD, 0) != MAX11802_MODE) {
|
|
release_bus(m);
|
|
return FALSE;
|
|
}
|
|
|
|
release_bus(m);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static bool_t read_xyz(GMouse* m, GMouseReading* pdr)
|
|
{
|
|
uint8_t readyCount;
|
|
uint8_t notReadyCount;
|
|
|
|
// Assume not touched.
|
|
pdr->buttons = 0;
|
|
pdr->z = 0;
|
|
|
|
aquire_bus(m);
|
|
|
|
// Start the conversion
|
|
gfintWriteCommand(m, MAX11802_CMD_MEASUREXY); // just write command
|
|
release_bus(m);
|
|
|
|
/**
|
|
* put a delay in here, since conversion will take a finite time - longer if we were reading Z as well
|
|
* Potentially at least 1msec for 3 axes with 8us conversion time per sample, 8 samples per average
|
|
* Note Maxim AN5435-software to do calculation (www.maximintegrated.com/design/tools/appnotes/5435/AN5435-software.zip)
|
|
*
|
|
* We'll just use a fixed delay to avoid too much polling/bus activity
|
|
*/
|
|
gfxSleepMilliseconds(2); // Was 1 - try 2
|
|
|
|
/* Wait for data ready
|
|
* Note: MAX11802 signals the readiness of the results using the lowest 4 bits of the result. However, these are the
|
|
* last bits to be read out of the device. It is possible for the hardware value to change in the middle of the read,
|
|
* causing the analog value to still be invalid even though the tags indicate a valid result.
|
|
*
|
|
* We work around this by reading the registers once more after the tags indicate they are ready.
|
|
* There's also a separate counter to guard against never getting valid readings.
|
|
*
|
|
* Read the two readings required in a single burst, swapping x and y order if necessary
|
|
*
|
|
* Reading Z is possible but complicated requiring two z readings, multiplication and division, various constant ratio's,
|
|
* and interpolation in relation to the X and Y readings. It is not a simple pressure reading.
|
|
* In other words, don't bother trying.
|
|
*/
|
|
|
|
readyCount = notReadyCount = 0;
|
|
do {
|
|
// Get a set of readings
|
|
aquire_bus(m);
|
|
gfintWriteCommand(m, MAX11802_CMD_XPOSITION);
|
|
#if defined(GINPUT_MOUSE_YX_INVERTED) && GINPUT_MOUSE_YX_INVERTED
|
|
pdr->y = read_value(m);
|
|
pdr->x = read_value(m);
|
|
#else
|
|
pdr->x = read_value(m);
|
|
pdr->y = read_value(m);
|
|
#endif
|
|
release_bus(m);
|
|
|
|
// Test the result validity
|
|
if (((pdr->x | pdr->y) & 0x03) == 0x03) {
|
|
|
|
// Has it been too long? If so give up
|
|
if (++notReadyCount >= 5) {
|
|
return FALSE;
|
|
}
|
|
|
|
// Give up the time slice to someone else and then try again
|
|
gfxYield();
|
|
continue;
|
|
}
|
|
|
|
// We have a result but we need two valid results to believe it
|
|
readyCount++;
|
|
|
|
} while (readyCount < 2);
|
|
|
|
/**
|
|
* format of each value returned by MAX11802:
|
|
* Bits 15..4 - analog value
|
|
* Bits 3..2 - tag value - measurement type (X, Y, Z1, Z2)
|
|
* Bits 1..0 - tag value - event type (00 = valid touch, 10 - no touch, 11 - measurement in progress)
|
|
*/
|
|
|
|
// Was there a valid touch?
|
|
if (((pdr->x | pdr->y) & 0x03) != 0x0) {
|
|
pdr->z = Z_MIN;
|
|
return TRUE;
|
|
}
|
|
|
|
// Strip the tags (we need to take care because coord_t is signed - and sign bit gets extended on shift!)
|
|
pdr->x = (uint16_t)(pdr->x) >> 4;
|
|
pdr->y = (uint16_t)(pdr->y) >> 4;
|
|
pdr->z = Z_MAX;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
const GMouseVMT const GMOUSE_DRIVER_VMT[1] = {{
|
|
{
|
|
GDRIVER_TYPE_TOUCH,
|
|
GMOUSE_VFLG_TOUCH | GMOUSE_VFLG_ONLY_DOWN | GMOUSE_VFLG_POORUPDOWN | GMOUSE_VFLG_CALIBRATE | GMOUSE_VFLG_CAL_TEST,
|
|
sizeof(GMouse) + GMOUSE_MAX11802_BOARD_DATA_SIZE,
|
|
_gmouseInitDriver,
|
|
_gmousePostInitDriver,
|
|
_gmouseDeInitDriver
|
|
},
|
|
Z_MAX, // z_max
|
|
Z_MIN, // z_min
|
|
Z_MAX, // z_touchon
|
|
Z_MIN, // z_touchoff
|
|
{ // pen_jitter
|
|
GMOUSE_MAX11802_PEN_CALIBRATE_ERROR, // calibrate
|
|
GMOUSE_MAX11802_PEN_CLICK_ERROR, // click
|
|
GMOUSE_MAX11802_PEN_MOVE_ERROR // move
|
|
},
|
|
{ // finger_jitter
|
|
GMOUSE_MAX11802_FINGER_CALIBRATE_ERROR, // calibrate
|
|
GMOUSE_MAX11802_FINGER_CLICK_ERROR, // click
|
|
GMOUSE_MAX11802_FINGER_MOVE_ERROR // move
|
|
},
|
|
MouseInit, // init
|
|
0, // deinit
|
|
read_xyz, // get
|
|
0, // calsave
|
|
0 // calload
|
|
}};
|
|
|
|
#endif /* GFX_USE_GINPUT && GINPUT_NEED_MOUSE */
|