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Update to MAX11802 touch driver. To be tested.

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This commit is contained in:
inmarket 2014-11-10 13:54:19 +10:00
parent f65b189673
commit 069c791fc1
2 changed files with 73 additions and 65 deletions
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135
drivers/ginput/touch/MAX11802/gmouse_lld_MAX11802.c
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@ -12,34 +12,31 @@
#define GMOUSE_DRIVER_VMT GMOUSEVMT_MAX11802
#include "src/ginput/driver_mouse.h"
#define GMOUSE_MAX11802_FLG_TOUCHED (GMOUSE_FLG_DRIVER_FIRST << 0)
// Hardware definitions
#include "drivers/ginput/touch/MAX11802/max11802.h"
// Get the hardware interface
#include "gmouse_lld_MAX11802_board.h"
// Last values read from A-D channels
static uint16_t lastx, lasty;
static uint16_t lastz = { 100 << 4 }; // This may not be used, so initialise it (value is bits 15..4)
#define Z_MIN 0
#define Z_MAX 1
static bool_t MouseInit(GMouse* m, unsigned driverinstance)
{
uint8_t ret;
uint8_t *p;
const uint8_t commandList[][2] = {
{ 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
//{ MAX11802_CMD_APCONF_WR, 0x00 }, // Aperture config register - rewrite default
// Ignore aux config register - not used
{ MAX11802_CMD_MODE_WR, MAX11802_MODE }, // Set mode last
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))
@ -47,19 +44,21 @@ static bool_t MouseInit(GMouse* m, unsigned driverinstance)
aquire_bus(m);
for (ret = 0; ret < (sizeof(commandList) / (2 * sizeof(uint8_t))); ret++) {
write_command(m, commandList[ret][0], commandList[ret][1]);
}
for (p = commandList; p < commandList+sizeof(commandList); p += 2)
write_command(m, p[0], p[1]);
ret = write_command(m, MAX11802_CMD_MODE_RD, 0); // Read something as a test
if (ret != MAX11802_MODE) {
// Error here - @TODO: What can we do about it?
// Read something as a test
if (write_command(m, MAX11802_CMD_MODE_RD, 0) != MAX11802_MODE) {
release_bus(m);
return FALSE;
}
release_bus(m);
return TRUE;
}
static void read_xyz(GMouse* m, GMouseReading* pdr)
static bool_t read_xyz(GMouse* m, GMouseReading* pdr)
{
uint8_t readyCount;
uint8_t notReadyCount;
@ -70,11 +69,8 @@ static void read_xyz(GMouse* m, GMouseReading* pdr)
aquire_bus(m);
#if MAX11802_READ_Z_VALUE
gfintWriteCommand(m, MAX11802_CMD_MEASUREXYZ); // just write command
#else
// Start the conversion
gfintWriteCommand(m, MAX11802_CMD_MEASUREXY); // just write command
#endif
/**
* put a delay in here, since conversion will take a finite time - longer if reading Z as well
@ -94,49 +90,64 @@ static void read_xyz(GMouse* m, GMouseReading* pdr)
* There's also a separate counter to guard against never getting valid readings.
*
* Read the two or three 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 = 0;
notReadyCount = 0;
readyCount = notReadyCount = 0;
do {
gfintWriteCommand(m, MAX11802_CMD_XPOSITION); // This sets pointer to first byte of block
// Get a set of readings
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
#if defined(GINPUT_MOUSE_YX_INVERTED) && GINPUT_MOUSE_YX_INVERTED
lasty = read_value(m);
lastx = read_value(m);
#else
lastx = read_value(m);
lasty = read_value(m));
#endif
#if MAX11802_READ_Z_VALUE
lastz = read_value(m);
if (((lastx & 0x0f) != 0xF) && ((lasty * 0xf0) != 0xF) && ((lastz * 0xf0) != 0xF))
#else
if (((lastx & 0x0f) != 0xF) && ((lasty * 0xf0) != 0xF))
#endif
{
readyCount++;
// Test the result validity
if (((pdr->x | pdr->y) & 0x03) == 0x03) {
// Has it been too long? If so give up
if (++notReadyCount >= 5) {
release_bus(m);
return FALSE;
}
// Give up the time slice to someone else and then try again
gfxYield();
continue;
}
else
{
notReadyCount++; // Protect against infinite loops
}
} while ((readyCount < 2) && (notReadyCount < 20));
// We have a result but we need two valid results to believe it
readyCount++;
} while (readyCount < 2);
release_bus(m);
/**
* 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)
*/
pt->x = lastx >> 4; // Delete the tags
pt->y = lasty >> 4;
pt->z = lastz >> 4; // If no Z-axis, lastz has been initialised to return 100
pt->buttons = ((0 == (lastx & 3)) && (0 == (lasty & 3)) && (0 == (lastz & 3))) ? GINPUT_TOUCH_PRESSED : 0;
// Was there a valid touch?
if ((pt->x & 0x03) == 0x02) {
pdr->z = Z_MIN;
return TRUE;
}
release_bus(m);
// Strip the tags
pt->x >>= 4;
pt->y >>= 4;
pdr->z = Z_MAX;
return TRUE;
}
const GMouseVMT const GMOUSE_DRIVER_VMT[1] = {{
@ -148,10 +159,10 @@ const GMouseVMT const GMOUSE_DRIVER_VMT[1] = {{
_gmousePostInitDriver,
_gmouseDeInitDriver
},
255, // z_max
0, // z_min
20, // z_touchoff
200, // z_touchon
Z_MAX, // z_max
Z_MIN, // z_min
Z_MIN, // z_touchoff
Z_MAX, // z_touchon
{ // pen_jitter
GMOUSE_MAX11802_PEN_CALIBRATE_ERROR, // calibrate
GMOUSE_MAX11802_PEN_CLICK_ERROR, // click

3
drivers/ginput/touch/MAX11802/gmouse_lld_MAX11802_board_template.h
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@ -8,9 +8,6 @@
#ifndef _GINPUT_LLD_MOUSE_BOARD_H
#define _GINPUT_LLD_MOUSE_BOARD_H
// Experimental to read pressure on Z1 as well
#define MAX11802_READ_Z_VALUE FALSE
// Resolution and Accuracy Settings
#define GMOUSE_MAX11802_PEN_CALIBRATE_ERROR 8
#define GMOUSE_MAX11802_PEN_CLICK_ERROR 6