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0dde525a4601ec01aa330cd4aaa51a311edb4c19
lcdproc/server/drivers/ula200.c
T
marschap a399d2b9ef fix typo in function name
2008-08-03 15:06:57 +00:00

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// Description:
//
// This is a driver for the ULA-200 from ELV (http://www.elv.de). It's a small
// board which can be connected to the PC via USB interface and that allows to
// connect a HD44780-compatible display. It also has a connection for up to 6
// input buttons.
//
// It uses libftdi (which uses libusb) for communication, so no kernel driver
// is needed. You have to take care that ftdi_sio module doesn't claim the ELV
// device. If you didn't change the ids in the driver (ftdi_sio.c), you don't
// have to matter.
//
//
// Features:
//
// - text display is supported
// - standard symbols (heart, checkbox) are supported
// - backlight is supported
// - input buttons are supported
// - bars are NOT supported
//
//
// Configuration options (the values are the default values):
//
// - Size=20x4
// - KeyMap_A=Up
// - KeyMap_B=Down
// - KeyMap_C=Left
// - KeyMap_D=Right
// - KeyMap_E=Enter
// - KeyMap_F=Escape
//
//
// Known problems:
//
// Sometimes the display hangs (the ACK response is not received) on shutdown.
// Reconnect the display in that case. The same if it hangs while starting
// up (only happens if it was not the first time lcdproc talked to the
// display).
//
// I tried several hours to fix this, I simply find the reason for this problem.
//
//
// Implementation note:
//
// The ULA-200 talks a text protocol which allows to display text using a
// high-level language, i.e. STX 's' <len> <char0> <char1> ... ETX. It also
// allows low-level register access to the HD44780. So in theory, it would be
// possible to write a hd44780 extension and let the hd44780 core do the rest.
// I tried this. It was slow and didn't work with user-specific characters
// (the hd44780 frequently changes this characters which seems to confuse the
// microcontroller, at least I cannot explain why it didn't work, there was
// garbare).
//
// So I wrote a own driver (this here) which uses the high-level language and
// should work for displays with all sizes. I only tested 20x4, so maybe for
// other sizes the positioning code may be adapted.
//
// As I mentioned, there were problems with frequently changing the
// user-definable characters. I also tried to implement bar code in the ula200
// driver with similar effects. I gave it up because I don't need it personally
// and it can be done later. However, standard icons are implemented. The
// user-definable characters are set in startup and are not changed. This
// works like a charm. It is not possible to use character 0 with the
// high-level language (or at least it isn't documented how to escape it).
// It could be done with hd44780 code, but I replaced the character with
// a standard character which looks good.
//
//
// Author
//
// Bernhard Walle <bernhard.walle@gmx.de>
// Feel free to contact me if there are problems with this driver.
//
/* Copyright (C) 2006 Bernhard Walle <bernhard.walle@gmx.de>
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 2 of the License, or
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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <syslog.h>
#include <usb.h>
#include <ftdi.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "hd44780-charmap.h"
#include "lcd.h"
#include "ula200.h"
#include "report.h"
#include "lcd_lib.h"
#include "timing.h"
/* Vars for the server core */
MODULE_EXPORT char *api_version = API_VERSION;
MODULE_EXPORT int stay_in_foreground = 0;
MODULE_EXPORT int supports_multiple = 1;
MODULE_EXPORT char *symbol_prefix = "ula200_";
///////////////////////////////////////////////////////////////////////////////
// constants
//
#define DISPLAY_VENDOR_ID 0x0403
#define DISPLAY_PRODUCT_ID 0xf06d
#define CH_STX 0x02
#define CH_ETX 0x03
#define CH_ENQ 0x05
#define CH_ACK 0x06
#define CH_NAK 0x15
#define CH_DC2 0x12
#define CH_DC3 0x13
#define MAX_KEY_MAP 6
static char *default_key_map[MAX_KEY_MAP] = { "Up", "Down", "Left", "Right", "Enter", "Escape" };
#define CELLWIDTH 5
#define CELLHEIGHT 8
/* repeat conts for responses */
#define MAX_REPEATS 20
///////////////////////////////////////////////////////////////////////////////
// Key ring implementation from CFontz633io
//
/* KeyRing management */
#define KEYRINGSIZE 16
typedef struct {
unsigned char contents[KEYRINGSIZE];
int head;
int tail;
} KeyRing;
/*
* KeyRing handling functions.
* This separates the producer from the consumer.
* It is just a small fifo of unsigned char.
*/
/** initialize/empty key ring by resetting its read & write pointers */
void EmptyKeyRing(KeyRing *kr)
{
kr->head = kr->tail = 0;
}
/** add byte to key ring; return success (byte added) / failure (key ring is full) */
int AddKeyToKeyRing(KeyRing *kr, unsigned char key)
{
if (((kr->head + 1) % KEYRINGSIZE) != (kr->tail % KEYRINGSIZE)) {
/* fprintf(stderr, "We add key: %d\n", key); */
kr->contents[kr->head % KEYRINGSIZE] = key;
kr->head = (kr->head + 1) % KEYRINGSIZE;
return 1;
}
/* KeyRing overflow: do not accept extra key */
return 0;
}
/** get byte from key ring (or '\\0' if key ring is empty) */
unsigned char GetKeyFromKeyRing(KeyRing *kr)
{
unsigned char retval = '\0';
kr->tail %= KEYRINGSIZE;
if ((kr->head % KEYRINGSIZE) != kr->tail) {
retval = kr->contents[kr->tail];
kr->tail = (kr->tail + 1) % KEYRINGSIZE;
}
/* if (retval) fprintf(stderr, "We remove key: %d\n", retval); */
return retval;
}
///////////////////////////////////////////////////////////////////////////////
// for HD 44780 compatibility
//
// commands for senddata
#define RS_DATA 0x00
#define RS_INSTR 0x01
#define SETCHAR 0x40 /* Only reachable with EXTREG clear */
///////////////////////////////////////////////////////////////////////////////
// private data types
//
typedef struct {
// the handle for the USB FTDI library
struct ftdi_context ftdic;
// the width and the height (in number of characters) of the library
int width, height;
// The framebuffer and the framebuffer for the last contents (incr. update)
unsigned char *framebuf, *lcd_contents;
// first time => all is dirty
unsigned char all_dirty;
// backlight (-1 = unset, 0 = off, 1 = on)
int backlight;
// the keyring
KeyRing keyring;
// the keymap
char *key_map[MAX_KEY_MAP];
} PrivateData;
///////////////////////////////////////////////////////////////////////////////
// Reads a USB characters
static inline int
ula200_ftdi_usb_read(PrivateData *p)
{
unsigned char buffer[1];
int err;
while ((err = ftdi_read_data(&p->ftdic, buffer, 1)) == 0);
if (err < 0) {
return -1;
}
else {
return buffer[0];
}
}
///////////////////////////////////////////////////////////////////////////////
// Reads the response
//
// @return true if ACK was responded, false if NACk was responded
//
static bool
ula200_ftdi_read_response(Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
bool result = false;
bool answer_read = false;
int ret;
int ch;
while (!answer_read)
{
/* wait until STX */
while (((ret = ula200_ftdi_usb_read(p)) != CH_STX) && (ret > 0));
if (ret < 0) {
return false;
}
/* read next char */
ch = ula200_ftdi_usb_read(p);
switch (ch) {
case 't':
ch = ula200_ftdi_usb_read(p);
AddKeyToKeyRing(&p->keyring, (unsigned char)(ch - 0x40));
break;
case CH_ACK:
answer_read = true;
result = true;
break;
case CH_NAK:
answer_read = true;
break;
default:
answer_read = true;
report(RPT_INFO, "%s: read invalid answer (0x%02X)", drvthis->name, ch);
}
/* wait until ETX */
while (((ret = ula200_ftdi_usb_read(p)) != CH_ETX) && (ret > 0));
if (ret < 0) {
return false;
}
}
return result;
}
///////////////////////////////////////////////////////////////////////////////
// Write a command to the display. Adds the STX and ETX header/trailer.
//
// @param p the private data
// @param data the data bytes
// @param length the number of bytes in @p data which are valid
// @param escape if the data should be escaped (see the User's Guide of the
// ULA-200)
// @return 0 on success, negative value on error
//
static int
ula200_ftdi_write_command(Driver *drvthis, unsigned char *data, int length, bool escape)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
int i, err;
int repeat_count = 0;
int pos = 0;
unsigned char buffer[1024];
if (length > 512) {
return -EINVAL;
}
/* fill the array */
buffer[pos++] = CH_STX;
for (i = 0; i < length; i++) {
if (escape) {
if (data[i] == CH_STX) {
buffer[pos++] = CH_ENQ;
buffer[pos++] = CH_DC2;
}
else if (data[i] == CH_ETX) {
buffer[pos++] = CH_ENQ;
buffer[pos++] = CH_DC3;
}
else if (data[i] == CH_ENQ) {
buffer[pos++] = CH_ENQ;
buffer[pos++] = CH_NAK;
}
else {
buffer[pos++] = data[i];
}
}
else {
buffer[pos++] = data[i];
}
}
buffer[pos++] = CH_ETX;
do {
/* bytes */
err = ftdi_write_data(&p->ftdic, buffer, pos);
if (err < 0) {
report(RPT_WARNING, "%s: ftdi_write_data failed", drvthis->name);
return -1;
}
}
while (!ula200_ftdi_read_response(drvthis) && (repeat_count++ < MAX_REPEATS));
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// Clear the display
//
static int
ula200_ftdi_clear(Driver *drvthis)
{
//PrivateData *p = (PrivateData *) drvthis->private_data;
unsigned char command[1];
int err;
command[0] = 'l';
err = ula200_ftdi_write_command(drvthis, command, 1, true);
if (err < 0) {
report(RPT_WARNING, "%s: ula200_ftdi_clear: "
"ula200_ftdi_write_command failed", drvthis->name);
}
return err;
}
///////////////////////////////////////////////////////////////////////////////
// Set the position
//
static int
ula200_ftdi_position(Driver *drvthis, int x, int y)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
unsigned char command[5];
int err;
if (y >= 2) {
y -= 2;
x += p->width;
}
command[0] = 'p';
command[1] = x;
command[2] = y;
err = ula200_ftdi_write_command(drvthis, command, 3, true);
if (err < 0) {
report(RPT_WARNING, "%s: ula200_ftdi_position(%d,%d): "
"ula200_ftdi_write_command failed",
drvthis->name, x, y);
}
return err;
}
///////////////////////////////////////////////////////////////////////////////
// Send raw data
//
static int
ula200_ftdi_rawdata(Driver *drvthis, unsigned char flags, unsigned char ch)
{
//PrivateData *p = (PrivateData *) drvthis->private_data;
unsigned char command[3];
unsigned int err;
command[0] = 'R';
command[1] = flags == (RS_DATA) ? '2' : '0';
command[2] = ch;
err = ula200_ftdi_write_command(drvthis, command, 3, false);
if (err < 0) {
report(RPT_ERR, "%s: ftdi_write_command() failed", drvthis->name);
}
return err;
}
///////////////////////////////////////////////////////////////////////////////
// Displays a string
//
static int
ula200_ftdi_string(Driver *drvthis, const unsigned char *string, int len)
{
//PrivateData *p = (PrivateData *) drvthis->private_data;
unsigned char buffer[128];
int err;
int i;
if (len > 80) {
return -EINVAL;
}
buffer[0] = 's';
buffer[1] = len;
for (i = 0; i < len; i++) {
buffer[i+2] = HD44780_charmap[(unsigned char)string[i]];
}
err = ula200_ftdi_write_command(drvthis, buffer, len+2, true);
if (err < 0) {
report(RPT_WARNING, "%s: ula200_ftdi_string: "
"ula200_ftdi_write_command() failed", drvthis->name);
}
return err;
}
///////////////////////////////////////////////////////////////////////////////
// Enables the raw register access mode.
//
static int
ula200_ftdi_enable_raw_mode(Driver *drvthis)
{
unsigned char command[3];
report(RPT_DEBUG, "%s: enable raw mode", drvthis->name);
command[0] = 'R';
command[1] = 'E';
command[2] = '1';
return ula200_ftdi_write_command(drvthis, command, 3, false);
}
///////////////////////////////////////////////////////////////////////////////
// Loads custom characters in the display
//
static int
ula200_load_custom_chars(Driver *drvthis)
{
int i, col, row;
int err = 0;
char custom_chars[8][CELLHEIGHT*CELLHEIGHT] = {
{ 1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1,
1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1,
1, 0, 1, 0, 1,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
1, 0, 0, 0, 1,
1, 1, 0, 1, 1,
1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1,
1, 0, 1, 0, 1,
0, 1, 0, 1, 0,
0, 1, 1, 1, 0,
0, 1, 1, 1, 0,
1, 0, 1, 0, 1,
1, 1, 0, 1, 1,
1, 1, 1, 1, 1 },
{ 0, 0, 1, 0, 0,
0, 1, 1, 1, 0,
1, 0, 1, 0, 1,
0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 0, 0 },
{ 0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
1, 0, 1, 0, 1,
0, 1, 1, 1, 0,
0, 0, 1, 0, 0,
0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
1, 1, 1, 1, 1,
1, 0, 0, 0, 1,
1, 0, 0, 0, 1,
1, 0, 0, 0, 1,
1, 1, 1, 1, 1,
0, 0, 0, 0, 0 },
{ 0, 0, 1, 0, 0,
0, 0, 1, 0, 0,
1, 1, 1, 0, 1,
1, 0, 1, 1, 0,
1, 0, 1, 0, 1,
1, 0, 0, 0, 1,
1, 1, 1, 1, 1,
0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
1, 1, 1, 1, 1,
1, 0, 1, 0, 1,
1, 1, 0, 1, 1,
1, 0, 1, 0, 1,
1, 1, 1, 1, 1,
0, 0, 0, 0, 0 }};
for (i = 0; i < 8 && err == 0; i++)
{
/* Tell the HD44780 we will redefine char number i */
ula200_ftdi_rawdata(drvthis, RS_INSTR, SETCHAR | i * 8);
if (err < 0) {
report(RPT_WARNING, "%s: ula200_ftdi_rawdata failed", drvthis->name);
break;
}
/* Send the subsequent rows */
for (row = 0; row < CELLHEIGHT; row++) {
int value = 0;
for (col = 0; col < CELLWIDTH; col++) {
value <<= 1;
value |= (custom_chars[i][(row * CELLWIDTH) + col] > 0) ? 1 : 0;
}
err = ula200_ftdi_rawdata(drvthis, RS_DATA, value);
if (err < 0) {
report(RPT_WARNING, "%s: ula200_ftdi_rawdata failed", drvthis->name);
break;
}
}
}
return err;
}
///////////////////////////////////////////////////////////////////////////////
// Init the driver and display
//
MODULE_EXPORT int
ula200_init(Driver *drvthis)
{
PrivateData *p;
int err, i;
const char *s;
// Alocate and store private data
p = (PrivateData *) malloc( sizeof( PrivateData) );
if (p == NULL) {
return -1;
}
if (drvthis->store_private_ptr(drvthis, p)) {
return -1;
}
p->backlight = -1;
p->all_dirty = 1;
EmptyKeyRing(&p->keyring);
// Get and parse size
s = drvthis->config_get_string(drvthis->name, "size", 0, "20x4");
if ((sscanf(s, "%dx%d", &(p->width), &(p->height)) != 2)
|| (p->width <= 0) || (p->width > LCD_MAX_WIDTH)
|| (p->height <= 0) || (p->height > LCD_MAX_HEIGHT)) {
report(RPT_ERR, "%s: cannot read Size %s", drvthis->name, s);
return -1;
}
// read the keymap
for (i = 0; i < MAX_KEY_MAP; i++) {
char buf[40];
// First fill with default value
p->key_map[i] = default_key_map[i];
// Read config value
sprintf(buf, "KeyMap_%c", i+'A');
s = drvthis->config_get_string(drvthis->name, buf, 0, NULL);
// Was a key specified in the config file ?
if (s != NULL) {
p->key_map[i] = strdup(s);
report(RPT_INFO, "%s: Key '%c' mapped to \"%s\"",
drvthis->name, i+'A', s );
}
}
/* End of config file parsing */
// Allocate framebuffer
p->framebuf = (unsigned char *) malloc(p->width * p->height);
if (p->framebuf == NULL) {
report(RPT_ERR, "%s: unable to allocate framebuffer", drvthis->name);
goto err_begin;
}
// Allocate and clear the buffer for incremental updates
p->lcd_contents = (unsigned char *) malloc(p->width * p->height);
if (p->lcd_contents == NULL) {
report(RPT_ERR, "%s: unable to allocate framebuffer backing store", drvthis->name);
goto err_framebuf;
}
memset(p->lcd_contents, 0, p->width * p->height);
// open the FTDI library
ftdi_init(&p->ftdic);
(&p->ftdic)->usb_write_timeout = 20;
(&p->ftdic)->usb_read_timeout = 20;
// open the device
err = ftdi_usb_open(&p->ftdic, DISPLAY_VENDOR_ID, DISPLAY_PRODUCT_ID);
if (err < 0) {
report(RPT_ERR, "%s: cannot open USB device", drvthis->name);
goto err_lcd;
}
// set the baudrate
err = ftdi_set_baudrate(&p->ftdic, 19200);
if (err < 0) {
report(RPT_ERR, "%s: cannot set baudrate", drvthis->name);
goto err_ftdi;
}
// set communication parameters
err = ftdi_set_line_property(&p->ftdic, BITS_8, STOP_BIT_1, EVEN);
if (err < 0) {
report(RPT_ERR, "%s: cannot set line properties", drvthis->name);
goto err_ftdi;
}
// user is able to write commands
err = ula200_ftdi_enable_raw_mode(drvthis);
if (err < 0) {
report(RPT_ERR, "%s: unable to enable the raw mode", drvthis->name);
goto err_ftdi;
}
// load the chars
err = ula200_load_custom_chars(drvthis);
if (err < 0) {
report(RPT_ERR, "%s: unable to write the custom characters", drvthis->name);
goto err_ftdi;
}
report(RPT_DEBUG, "%s: init() done", drvthis->name);
return 0;
err_ftdi:
ftdi_usb_close(&p->ftdic);
ftdi_deinit(&p->ftdic);
err_framebuf:
free(p->framebuf);
err_lcd:
free(p->lcd_contents);
err_begin:
return -1;
}
///////////////////////////////////////////////////////////////////////////////
// Clean-up
//
MODULE_EXPORT void
ula200_close(Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
if (p != NULL) {
ftdi_usb_purge_buffers(&p->ftdic);
ftdi_usb_close(&p->ftdic);
ftdi_deinit(&p->ftdic);
if (p->framebuf != NULL)
free(p->framebuf);
if (p->lcd_contents != NULL)
free(p->lcd_contents);
free(p);
}
drvthis->store_private_ptr(drvthis, NULL);
}
///////////////////////////////////////////////////////////////////////////////
// Returns the display width
//
MODULE_EXPORT int
ula200_width (Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
return p->width;
}
///////////////////////////////////////////////////////////////////////////////
// Returns the display height
//
MODULE_EXPORT int
ula200_height (Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
return p->height;
}
///////////////////////////////////////////////////////////////////////////////
// Clear the framebuffer
//
MODULE_EXPORT void
ula200_clear (Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
memset(p->framebuf, ' ', p->width * p->height);
}
///////////////////////////////////////////////////////////////////////////////
// Place a character in the framebuffer
//
MODULE_EXPORT void
ula200_chr (Driver *drvthis, int x, int y, char ch)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
y--;
x--;
p->framebuf[ (y * p->width) + x] = ch;
}
///////////////////////////////////////////////////////////////////////////////
// Place a string in the framebuffer
//
MODULE_EXPORT void
ula200_string (Driver *drvthis, int x, int y, const char string[])
{
PrivateData *p = (PrivateData *) drvthis->private_data;
int i;
x --; // Convert 1-based coords to 0-based
y --;
for (i = 0; string[i] != '\0'; i++) {
// Check for buffer overflows...
if ((y * p->width) + x + i > (p->width * p->height))
break;
p->framebuf[(y*p->width) + x + i] = string[i];
}
}
///////////////////////////////////////////////////////////////////////////////
// Sets the backlight on or off
//
MODULE_EXPORT void
ula200_backlight (Driver *drvthis, int on)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
unsigned char command[2];
int err;
if (p->backlight != on) {
p->backlight = on;
command[0] = 'h';
command[1] = (on) ? '1' : '0';
err = ula200_ftdi_write_command(drvthis, command, 2, false);
if (err < 0)
report(RPT_WARNING, "%s: error in ula200_ftdi_write_command",
drvthis->name);
else
report(RPT_INFO, "%s: turn backlight %s",
drvthis->name, (on) ? "on" : "off");
}
}
///////////////////////////////////////////////////////////////////////////////
// Flush the framebuffer to the display
//
MODULE_EXPORT void
ula200_flush(Driver *drvthis)
{
PrivateData *p = (PrivateData *) drvthis->private_data;
int x, y;
int wid = p->width;
char ch;
char drawing;
int count;
int firstdiff;
int lastdiff;
if (p->all_dirty) {
ula200_ftdi_clear(drvthis);
p->all_dirty = 0;
}
// Update LCD incrementally by comparing with last contents
count = 0;
for (y = 0; y < p->height; y++) {
drawing = 0;
firstdiff = -1;
lastdiff = 0;
for (x = 0 ; x < wid; x++) {
ch = p->framebuf[(y * wid) + x];
if (ch != p->lcd_contents[(y*wid)+x]) {
p->lcd_contents[(y*wid)+x] = ch;
if (firstdiff == -1) {
firstdiff = x;
}
lastdiff = x;
}
}
if (firstdiff >= 0) {
ula200_ftdi_position(drvthis, firstdiff, y);
ula200_ftdi_string(drvthis, p->framebuf + (y*wid) + firstdiff,
lastdiff - firstdiff + 1);
}
}
}
///////////////////////////////////////////////////////////////////////////////
// Set default icon into a userdef char
//
MODULE_EXPORT int
ula200_icon (Driver *drvthis, int x, int y, int icon)
{
/* Yes I know, this is a VERY BAD implementation */
switch (icon) {
case ICON_BLOCK_FILLED:
ula200_chr(drvthis, x, y, 0xff);
break;
case ICON_HEART_FILLED:
ula200_chr(drvthis, x, y, 2);
break;
case ICON_HEART_OPEN:
ula200_chr(drvthis, x, y, 1);
break;
case ICON_ARROW_UP:
ula200_chr(drvthis, x, y, 3);
break;
case ICON_ARROW_DOWN:
ula200_chr(drvthis, x, y, 4);
break;
case ICON_ARROW_LEFT:
ula200_chr(drvthis, x, y, 0x7F);
break;
case ICON_ARROW_RIGHT:
ula200_chr(drvthis, x, y, 0x7E);
break;
case ICON_CHECKBOX_OFF:
ula200_chr(drvthis, x, y, 5);
break;
case ICON_CHECKBOX_ON:
ula200_chr(drvthis, x, y, 6);
break;
case ICON_CHECKBOX_GRAY:
ula200_chr(drvthis, x, y, 7);
break;
default:
return -1; /* Let the core do other icons */
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////
// Set default icon into a userdef char
//
MODULE_EXPORT const char *
ula200_get_key (Driver *drvthis)
{
PrivateData *p = drvthis->private_data;
unsigned char key;
int i;
// The libftdi has no non-blocking read (`select' system call), so we force
// a read that could not block by updating one character on the display.
// As long as lcdproc is single-threaded, we can write to the display because
// we're not inside a read here.
ula200_ftdi_position(drvthis, 0, 0);
ula200_ftdi_string(drvthis, p->lcd_contents, 1);
key = GetKeyFromKeyRing(&p->keyring);
// search the bit that was set by the hardware
for (i = 0; i < MAX_KEY_MAP; i++) {
if (key & (1 << i))
return p->key_map[i];
}
if (key != '\0') {
report(RPT_INFO, "%s: Untreated key 0x%02X", drvthis->name, key);
}
return NULL;
}
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