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authorreinelt <>2002-09-11 05:16:33 +0000
committerreinelt <>2002-09-11 05:16:33 +0000
commit2f52ad6d174cf677d3c1e8e286f658b79a8b1b07 (patch)
tree0a0e28cfaf7570295e0544af9a4b8c1da2f18411 /Cwlinux.c
parent33a43b7658084eaaf169b516e5c18d5e879cb2d2 (diff)
downloadlcd4linux-2f52ad6d174cf677d3c1e8e286f658b79a8b1b07.tar.gz
[lcd4linux @ 2002-09-11 05:16:32 by reinelt]
added Cwlinux driver
Diffstat (limited to 'Cwlinux.c')
-rw-r--r--Cwlinux.c821
1 files changed, 821 insertions, 0 deletions
diff --git a/Cwlinux.c b/Cwlinux.c
new file mode 100644
index 0000000..ab5c3e4
--- /dev/null
+++ b/Cwlinux.c
@@ -0,0 +1,821 @@
+/* $Id: Cwlinux.c,v 1.1 2002/09/11 05:16:32 reinelt Exp $
+ *
+ * driver for Cwlinux serial display modules
+ *
+ * Copyright 2002 by Andrew Ip (aip@cwlinux.com)
+ *
+ * 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, or (at your option)
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: Cwlinux.c,v $
+ * Revision 1.1 2002/09/11 05:16:32 reinelt
+ * added Cwlinux driver
+ *
+ */
+
+/*
+ *
+ * exported fuctions:
+ *
+ * struct LCD Cwlinux[]
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+
+#include "debug.h"
+#include "cfg.h"
+#include "lock.h"
+#include "display.h"
+
+#define XRES 6
+#define YRES 8
+#define CHARS 7
+#define BARS ( BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 )
+
+#define LCD_CMD 254
+#define LCD_CMD_END 253
+#define LCD_INIT_CHINESE_T 56
+#define LCD_INIT_CHINESE_S 55
+#define LCD_LIGHT_ON 66
+#define LCD_LIGHT_OFF 70
+#define LCD_CLEAR 88
+#define LCD_SET_INSERT 71
+#define LCD_INIT_INSERT 72
+#define LCD_SET_BAUD 57
+#define LCD_ENABLE_WRAP 67
+#define LCD_DISABLE_WRAP 68
+#define LCD_SETCHAR 78
+#define LCD_ENABLE_CURSOR 81
+#define LCD_DISABLE_CURSOR 82
+
+#define LCD_LENGTH 20
+
+#define DELAY 20
+#define UPDATE_DELAY 0 /* 1 sec */
+#define SETUP_DELAY 0 /* 2 sec */
+
+typedef struct {
+ int len1;
+ int len2;
+ int type;
+ int segment;
+} BAR;
+
+typedef struct {
+ int len1;
+ int len2;
+ int type;
+ int used;
+ int ascii;
+} SEGMENT;
+
+static LCD Lcd;
+static char *Port = NULL;
+static speed_t Speed;
+static int Device = -1;
+
+static char Txt[4][20];
+static BAR Bar[4][20];
+
+static int nSegment = 2;
+static SEGMENT Segment[128] = { {len1: 0, len2: 0, type: 255, \
+ used: 0, ascii:32} };
+
+int Read_LCD(int fd, char *c, int size)
+{
+ int rc;
+
+ rc = read(fd, c, size);
+ usleep(DELAY);
+ return rc;
+}
+
+int Write_LCD(int fd, char *c, int size)
+{
+ int rc;
+
+ rc = write(fd, c, size);
+ usleep(DELAY);
+ return rc;
+}
+
+
+void Enable_Cursor(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_ENABLE_CURSOR;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void Disable_Cursor(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_DISABLE_CURSOR;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void Clear_Screen(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CLEAR;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void Enable_Wrap(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_ENABLE_WRAP;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void Init_Port(fd)
+{
+ /* Posix - set baudrate to 0 and back */
+ struct termios tty, old;
+
+ tcgetattr(fd, &tty);
+ tcgetattr(fd, &old);
+ cfsetospeed(&tty, B0);
+ cfsetispeed(&tty, B0);
+ tcsetattr(fd, TCSANOW, &tty);
+ usleep(SETUP_DELAY);
+ tcsetattr(fd, TCSANOW, &old);
+}
+
+void Setup_Port(int fd, speed_t speed)
+{
+ struct termios portset;
+
+ tcgetattr(fd, &portset);
+ cfsetospeed(&portset, speed);
+ cfsetispeed(&portset, speed);
+ portset.c_iflag = IGNBRK;
+ portset.c_lflag = 0;
+ portset.c_oflag = 0;
+ portset.c_cflag |= CLOCAL | CREAD;
+ portset.c_cflag &= ~CRTSCTS;
+ portset.c_cc[VMIN] = 1;
+ portset.c_cc[VTIME] = 5;
+ tcsetattr(fd, TCSANOW, &portset);
+}
+
+void Set_9600(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_SET_BAUD;
+ rc = Write_LCD(fd, &c, 1);
+ c = 0x20;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void Set_19200(int fd)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_SET_BAUD;
+ rc = Write_LCD(fd, &c, 1);
+ c = 0xf;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+int Write_Line_LCD(int fd, char *buf, int size)
+{
+ int i;
+ char c;
+ int isEnd = 0;
+ int rc;
+
+ for (i = 0; i < size; i++) {
+ if (buf[i] == '\0') {
+ isEnd = 1;
+ }
+ if (isEnd) {
+ c = ' ';
+ } else {
+ c = buf[i];
+ }
+ rc = Write_LCD(fd, &c, 1);
+ }
+ printf("%s\n", buf);
+ return 0;
+}
+
+void Set_Insert(int fd, int row, int col)
+{
+ char c;
+ int rc;
+
+ c = LCD_CMD;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_SET_INSERT;
+ rc = Write_LCD(fd, &c, 1);
+ c = col;
+ rc = Write_LCD(fd, &c, 1);
+ c = row;
+ rc = Write_LCD(fd, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(fd, &c, 1);
+}
+
+void CwLnx_backlight(int on)
+{
+ static int current = -1;
+ int realbacklight = -1;
+ char c;
+ int rc;
+
+ if (on == current)
+ return;
+
+ /* validate backlight value */
+ if (on > 255)
+ on = 255;
+ if (on < 0)
+ on = 0;
+
+ current = on;
+
+ realbacklight = (int) (current * 100 / 255);
+
+ c = LCD_CMD;
+ rc = Write_LCD(Device, &c, 1);
+ c = LCD_LIGHT_ON;
+ rc = Write_LCD(Device, &c, 1);
+ c = LCD_CMD_END;
+ rc = Write_LCD(Device, &c, 1);
+}
+
+static void CwLnx_linewrap(int on)
+{
+ char out[4];
+
+ if (on)
+ snprintf(out, sizeof(out), "%c", 23);
+ else
+ snprintf(out, sizeof(out), "%c", 24);
+ Enable_Wrap(Device);
+}
+
+static void CwLnx_autoscroll(int on)
+{
+ return;
+}
+
+static void CwLnx_hidecursor()
+{
+ return;
+}
+
+static int CwLnx_open(void)
+{
+ int fd;
+ pid_t pid;
+ struct termios portset;
+
+ if ((pid = lock_port(Port)) != 0) {
+ if (pid == -1)
+ error("Cwlinux: port %s could not be locked", Port);
+ else
+ error("Cwlinux: port %s is locked by process %d", Port, pid);
+ return -1;
+ }
+ fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY);
+ if (fd == -1) {
+ error("Cwlinux: open(%s) failed: %s", Port, strerror(errno));
+ unlock_port(Port);
+ return -1;
+ }
+ if (tcgetattr(fd, &portset) == -1) {
+ error("Cwlinux: tcgetattr(%s) failed: %s", Port, strerror(errno));
+ unlock_port(Port);
+ return -1;
+ }
+ cfmakeraw(&portset);
+ cfsetospeed(&portset, Speed);
+ if (tcsetattr(fd, TCSANOW, &portset) == -1) {
+ error("Cwlinux: tcsetattr(%s) failed: %s", Port, strerror(errno));
+ unlock_port(Port);
+ return -1;
+ }
+ return fd;
+}
+
+static void CwLnx_write(char *string, int len)
+{
+ if (Device == -1)
+ return;
+
+ if (Write_Line_LCD(Device, string, len) < 0) {
+ error("Cwlinux: write(%s) failed: %s", Port, strerror(errno));
+ }
+}
+
+static int CwLnx_contrast(void)
+{
+ return 0;
+}
+
+static void CwLnx_process_bars(void)
+{
+ int row, col;
+ int i, j;
+
+ for (i = 2; i < nSegment && Segment[i].used; i++);
+ for (j = i + 1; j < nSegment; j++) {
+ if (Segment[j].used)
+ Segment[i++] = Segment[j];
+ }
+ nSegment = i;
+
+ for (row = 0; row < Lcd.rows; row++) {
+ for (col = 0; col < Lcd.cols; col++) {
+ if (Bar[row][col].type == 0)
+ continue;
+ for (i = 0; i < nSegment; i++) {
+ if (Segment[i].type & Bar[row][col].type &&
+ Segment[i].len1 == Bar[row][col].len1 &&
+ Segment[i].len2 == Bar[row][col].len2)
+ break;
+ }
+ if (i == nSegment) {
+ nSegment++;
+ Segment[i].len1 = Bar[row][col].len1;
+ Segment[i].len2 = Bar[row][col].len2;
+ Segment[i].type = Bar[row][col].type;
+ Segment[i].used = 0;
+ Segment[i].ascii = -1;
+ }
+ Bar[row][col].segment = i;
+ }
+ }
+}
+
+static int CwLnx_segment_diff(int i, int j)
+{
+ int RES;
+ int i1, i2, j1, j2;
+
+ if (i == j)
+ return 65535;
+ if (!(Segment[i].type & Segment[j].type))
+ return 65535;
+ if (Segment[i].len1 == 0 && Segment[j].len1 != 0)
+ return 65535;
+ if (Segment[i].len2 == 0 && Segment[j].len2 != 0)
+ return 65535;
+ RES = Segment[i].type & BAR_H ? XRES : YRES;
+ if (Segment[i].len1 >= RES && Segment[j].len1 < RES)
+ return 65535;
+ if (Segment[i].len2 >= RES && Segment[j].len2 < RES)
+ return 65535;
+ if (Segment[i].len1 == Segment[i].len2
+ && Segment[j].len1 != Segment[j].len2)
+ return 65535;
+
+ i1 = Segment[i].len1;
+ if (i1 > RES)
+ i1 = RES;
+ i2 = Segment[i].len2;
+ if (i2 > RES)
+ i2 = RES;
+ j1 = Segment[j].len1;
+ if (j1 > RES)
+ i1 = RES;
+ j2 = Segment[j].len2;
+ if (j2 > RES)
+ i2 = RES;
+
+ return (i1 - i2) * (i1 - i2) + (j1 - j2) * (j1 - j2);
+}
+
+static void CwLnx_compact_bars(void)
+{
+ int i, j, r, c, min;
+ int pack_i, pack_j;
+ int pass1 = 1;
+ int deviation[nSegment][nSegment];
+
+ if (nSegment > CHARS + 2) {
+
+ for (i = 2; i < nSegment; i++) {
+ for (j = 0; j < nSegment; j++) {
+ deviation[i][j] = CwLnx_segment_diff(i, j);
+ }
+ }
+
+ while (nSegment > CHARS + 2) {
+ min = 65535;
+ pack_i = -1;
+ pack_j = -1;
+ for (i = 2; i < nSegment; i++) {
+ if (pass1 && Segment[i].used)
+ continue;
+ for (j = 0; j < nSegment; j++) {
+ if (deviation[i][j] < min) {
+ min = deviation[i][j];
+ pack_i = i;
+ pack_j = j;
+ }
+ }
+ }
+ if (pack_i == -1) {
+ if (pass1) {
+ pass1 = 0;
+ continue;
+ } else {
+ error("Cwlinux: unable to compact bar characters");
+ nSegment = CHARS;
+ break;
+ }
+ }
+
+ nSegment--;
+ Segment[pack_i] = Segment[nSegment];
+
+ for (i = 0; i < nSegment; i++) {
+ deviation[pack_i][i] = deviation[nSegment][i];
+ deviation[i][pack_i] = deviation[i][nSegment];
+ }
+
+ for (r = 0; r < Lcd.rows; r++) {
+ for (c = 0; c < Lcd.cols; c++) {
+ if (Bar[r][c].segment == pack_i)
+ Bar[r][c].segment = pack_j;
+ if (Bar[r][c].segment == nSegment)
+ Bar[r][c].segment = pack_i;
+ }
+ }
+ }
+ }
+}
+
+void CwLnx_set_char(int n, char *dat)
+{
+ int row, col;
+ char letter;
+ char c;
+ int rc;
+
+ if (n < 1 || n > 8)
+ return;
+ if (!dat)
+ return;
+
+ c = LCD_CMD;
+ rc = Write_LCD(Device, &c, 1);
+ c = LCD_SETCHAR;
+ rc = Write_LCD(Device, &c, 1);
+ c = (char)n;
+ rc = Write_LCD(Device, &c, 1);
+
+ for (col = 0; col < 6; col++) {
+ letter = 0;
+ for (row = 0; row < 8; row++) {
+ letter <<= 1;
+ letter |= (dat[(col * 8) + row] > 0);
+ }
+ Write_LCD(Device, &letter, 1);
+ }
+ c = LCD_CMD_END;
+ rc = Write_LCD(Device, &c, 1);
+}
+
+static void CwLnx_define_chars(void)
+{
+ int c, i, j, m, n;
+ char buffer[48];
+ char Pixelr[] = { 1, 9, 17, 25, 33, 41 };
+ char Pixell[] = { 40, 32, 24, 16, 8, 0 };
+
+ for (i = 2; i < nSegment; i++) {
+ if (Segment[i].used)
+ continue;
+ if (Segment[i].ascii != -1)
+ continue;
+ for (c = 1; c < CHARS; c++) {
+ for (j = 2; j < nSegment; j++) {
+ if (Segment[j].ascii == c)
+ break;
+ }
+ if (j == nSegment)
+ break;
+ }
+ Segment[i].ascii = c;
+ memset(buffer, 0, 48);
+ switch (Segment[i].type) {
+ case BAR_L:
+ for (n = 0; n < Segment[i].len1 - 1; n++) {
+ for (m = 0; m < 4; m++) {
+ buffer[Pixell[n] + 4 + m] = 1;
+ }
+ }
+ for (n = 0; n < Segment[i].len2 - 1; n++) {
+ for (m = 0; m < 4; m++) {
+ buffer[Pixell[n] + 0 + m] = 1;
+ }
+ }
+ break;
+ case BAR_R:
+ for (n = 0; n < Segment[i].len1; n++) {
+ for (m = 0; m < 3; m++) {
+ buffer[Pixelr[n] + 4 + m] = 1;
+ }
+ }
+ for (n = 0; n < Segment[i].len2; n++) {
+ for (m = 0; m < 3; m++) {
+ buffer[Pixelr[n] + 0 + m] = 1;
+ }
+ }
+ break;
+ case BAR_U:
+ for (j = 0; j < Segment[i].len1; j++) {
+ for (m = 0; m < 3; m++) {
+ buffer[j + m * 8] = 1;
+ }
+ }
+ for (j = 0; j < Segment[i].len2; j++) {
+ for (m = 0; m < 3; m++) {
+ buffer[j + m * 8 + 16] = 1;
+ }
+ }
+ break;
+ case BAR_D:
+ for (j = 0; j < Segment[i].len1; j++) {
+ for (m = 0; m < 3; m++) {
+ buffer[7 - j + m * 8] = 1;
+ }
+ }
+ for (j = 0; j < Segment[i].len2; j++) {
+ for (m = 0; m < 3; m++) {
+ buffer[7 - j + m * 8 + 16] = 1;
+ }
+ }
+ break;
+ }
+ CwLnx_set_char(c, buffer);
+ }
+}
+
+int CwLnx_clear(void)
+{
+ int row, col;
+ for (row = 0; row < Lcd.rows; row++) {
+ for (col = 0; col < Lcd.cols; col++) {
+ Txt[row][col] = '\t';
+ Bar[row][col].len1 = -1;
+ Bar[row][col].len2 = -1;
+ Bar[row][col].type = 0;
+ Bar[row][col].segment = -1;
+ }
+ }
+ Clear_Screen(Device);
+ return 0;
+}
+
+int CwLnx_init(LCD * Self)
+{
+ char *port;
+ char *speed;
+
+ Lcd = *Self;
+
+ if (Port) {
+ free(Port);
+ Port = NULL;
+ }
+
+ port = cfg_get("Port");
+ if (port == NULL || *port == '\0') {
+ error("Cwlinux: no 'Port' entry in %s", cfg_file());
+ return -1;
+ }
+ Port = strdup(port);
+
+ speed = cfg_get("Speed") ? : "19200";
+
+ switch (atoi(speed)) {
+ case 1200:
+ Speed = B1200;
+ break;
+ case 2400:
+ Speed = B2400;
+ break;
+ case 9600:
+ Speed = B9600;
+ break;
+ case 19200:
+ Speed = B19200;
+ break;
+ default:
+ error("Cwlinux: unsupported speed '%s' in %s", speed, cfg_file());
+ return -1;
+ }
+
+ debug("using port %s at %d baud", Port, atoi(speed));
+
+ Device = CwLnx_open();
+ if (Device == -1)
+ return -1;
+
+ CwLnx_clear();
+ CwLnx_contrast();
+
+ CwLnx_backlight(1);
+ CwLnx_hidecursor(0);
+ CwLnx_linewrap(0);
+ CwLnx_autoscroll(0);
+
+ return 0;
+}
+
+int CwLnx_put(int row, int col, char *text)
+{
+ char *p = &Txt[row][col];
+ char *t = text;
+
+ while (*t && col++ <= Lcd.cols) {
+ *p++ = *t++;
+ }
+ return 0;
+}
+
+int CwLnx_bar(int type, int row, int col, int max, int len1, int len2)
+{
+ int rev = 0;
+
+ if (len1 < 1)
+ len1 = 1;
+ else if (len1 > max)
+ len1 = max;
+
+ if (len2 < 1)
+ len2 = 1;
+ else if (len2 > max)
+ len2 = max;
+
+ switch (type) {
+ case BAR_L:
+ len1 = max - len1;
+ len2 = max - len2;
+ rev = 1;
+
+ case BAR_R:
+ while (max > 0 && col < Lcd.cols) {
+ Bar[row][col].type = type;
+ Bar[row][col].segment = -1;
+ if (len1 >= XRES) {
+ Bar[row][col].len1 = rev ? 0 : XRES;
+ len1 -= XRES;
+ } else {
+ Bar[row][col].len1 = rev ? XRES - len1 : len1;
+ len1 = 0;
+ }
+ if (len2 >= XRES) {
+ Bar[row][col].len2 = rev ? 0 : XRES;
+ len2 -= XRES;
+ } else {
+ Bar[row][col].len2 = rev ? XRES - len2 : len2;
+ len2 = 0;
+ }
+ max -= XRES;
+ col++;
+ }
+ break;
+
+ case BAR_U:
+ len1 = max - len1;
+ len2 = max - len2;
+ rev = 1;
+
+ case BAR_D:
+ while (max > 0 && row < Lcd.rows) {
+ Bar[row][col].type = type;
+ Bar[row][col].segment = -1;
+ if (len1 >= YRES) {
+ Bar[row][col].len1 = rev ? 0 : YRES;
+ len1 -= YRES;
+ } else {
+ Bar[row][col].len1 = rev ? YRES - len1 : len1;
+ len1 = 0;
+ }
+ if (len2 >= YRES) {
+ Bar[row][col].len2 = rev ? 0 : YRES;
+ len2 -= YRES;
+ } else {
+ Bar[row][col].len2 = rev ? YRES - len2 : len2;
+ len2 = 0;
+ }
+ max -= YRES;
+ row++;
+ }
+ break;
+
+ }
+ return 0;
+}
+
+int CwLnx_flush(void)
+{
+ char buffer[256];
+ char *p;
+ int s, row, col;
+
+ CwLnx_process_bars();
+ CwLnx_compact_bars();
+ CwLnx_define_chars();
+
+ for (s = 0; s < nSegment; s++) {
+ Segment[s].used = 0;
+ }
+
+ for (row = 0; row < Lcd.rows; row++) {
+ for (col = 0; col < Lcd.cols; col++) {
+ s = Bar[row][col].segment;
+ if (s != -1) {
+ Segment[s].used = 1;
+ Txt[row][col] = Segment[s].ascii;
+ }
+ }
+ Set_Insert(Device, row, col);
+ for (col = 0; col < Lcd.cols; col++) {
+ if (Txt[row][col] == '\t')
+ continue;
+ Set_Insert(Device, row, col);
+ for (p = buffer; col < Lcd.cols; col++, p++) {
+ if (Txt[row][col] == '\t')
+ break;
+ *p = Txt[row][col];
+ }
+ CwLnx_write(buffer, p - buffer);
+ }
+ }
+ return 0;
+}
+
+int CwLnx_quit(void)
+{
+ debug("closing port %s", Port);
+ close(Device);
+ unlock_port(Port);
+ return (0);
+}
+
+LCD Cwlinux[] = {
+ {"CW12232", 4, 20, XRES, YRES, BARS, 0, CwLnx_init, CwLnx_clear, \
+ CwLnx_put, CwLnx_bar, NULL, CwLnx_flush, CwLnx_quit},
+ {NULL}
+};