Pallavi Prasad
uVGA II for display using vga
Diff: TFT_4DGL_main.cpp
- Revision:
- 0:6741e7724181
diff -r 000000000000 -r 6741e7724181 TFT_4DGL_main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TFT_4DGL_main.cpp Thu Oct 11 20:12:02 2012 +0000
@@ -0,0 +1,387 @@
+//
+// TFT_4DGL is a class to drive 4D Systems TFT touch screens
+//
+// Copyright (C) <2010> Stephane ROCHON <stephane.rochon at free.fr>
+//
+// TFT_4DGL 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 3 of the License, or
+// (at your option) any later version.
+//
+// TFT_4DGL 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 TFT_4DGL. If not, see <http://www.gnu.org/licenses/>.
+
+#include "mbed.h"
+#include "TFT_4DGL.h"
+
+#define ARRAY_SIZE(X) sizeof(X)/sizeof(X[0])
+
+//Serial pc(USBTX,USBRX);
+
+//******************************************************************************************************
+TFT_4DGL :: TFT_4DGL(PinName tx, PinName rx, PinName rst) : _cmd(tx, rx),
+ _rst(rst)
+#if DEBUGMODE
+ ,pc(USBTX, USBRX)
+#endif // DEBUGMODE
+{ // Constructor
+
+#if DEBUGMODE
+ pc.baud(115200);
+
+ pc.printf("\n\n\n");
+ pc.printf("********************\n");
+ pc.printf("TFT_4DGL CONSTRUCTOR\n");
+ pc.printf("********************\n");
+#endif
+
+ _rst = 1; // put RESET pin to high to start TFT screen
+
+ reset();
+ autobaud(); // send autobaud command
+ version(); // get version information
+ cls(); // clear screen
+
+ current_col = 0; // initial cursor col
+ current_row = 0; // initial cursor row
+ current_color = WHITE; // initial text color
+ current_orientation = IS_PORTRAIT; // initial screen orientation
+
+ set_font(FONT_5X7); // initial font
+ text_mode(OPAQUE); // initial texr mode
+}
+
+//******************************************************************************************************
+void TFT_4DGL :: writeBYTE(char c) { // send a BYTE command to screen
+
+ _cmd.putc(c);
+ wait_ms(1);
+
+#if DEBUGMODE
+ pc.printf(" Char sent : 0x%02X\n",c);
+#endif
+
+}
+
+//******************************************************************************************************
+void TFT_4DGL :: freeBUFFER(void) { // Clear serial buffer before writing command
+
+ while (_cmd.readable()) _cmd.getc(); // clear buffer garbage
+}
+
+//******************************************************************************************************
+int TFT_4DGL :: writeCOMMAND(char *command, int number) { // send several BYTES making a command and return an answer
+
+#if DEBUGMODE
+ pc.printf("\n");
+ pc.printf("New COMMAND : 0x%02X\n", command[0]);
+#endif
+ int i, resp = 0;
+ freeBUFFER();
+
+ for (i = 0; i < number; i++) writeBYTE(command[i]); // send command to serial port
+
+ while (!_cmd.readable()) wait_ms(TEMPO); // wait for screen answer
+ if (_cmd.readable()) resp = _cmd.getc(); // read response if any
+ switch (resp) {
+ case ACK : // if OK return 1
+ resp = 1;
+ break;
+ case NAK : // if NOK return -1
+ resp = -1;
+ break;
+ default :
+ resp = 0; // else return 0
+ break;
+ }
+#if DEBUGMODE
+ pc.printf(" Answer received : %d\n",resp);
+#endif
+
+ return resp;
+}
+
+//**************************************************************************
+void TFT_4DGL :: reset() { // Reset Screen
+
+ _rst = 0; // put RESET pin to low
+ wait_ms(TEMPO); // wait a few milliseconds for command reception
+ _rst = 1; // put RESET back to high
+ wait(3); // wait 3s for screen to restart
+
+ freeBUFFER(); // clean buffer from possible garbage
+}
+
+//**************************************************************************
+void TFT_4DGL :: autobaud() { // send AutoBaud command (9600)
+ char command[1] = "";
+ command[0] = AUTOBAUD;
+ writeCOMMAND(command, 1);
+}
+
+//**************************************************************************
+void TFT_4DGL :: cls() { // clear screen
+ char command[1] = "";
+ command[0] = CLS;
+ writeCOMMAND(command, 1);
+}
+
+//**************************************************************************
+void TFT_4DGL :: version() { // get API version
+ char command[2] = "";
+ command[0] = VERSION;
+ command[1] = OFF;
+ readVERSION(command, 2);
+}
+
+//**************************************************************************
+void TFT_4DGL :: baudrate(int speed) { // set screen baud rate
+ char command[2]= "";
+ command[0] = BAUDRATE;
+ switch (speed) {
+ case 110 :
+ command[1] = BAUD_110;
+ break;
+ case 300 :
+ command[1] = BAUD_300;
+ break;
+ case 600 :
+ command[1] = BAUD_600;
+ break;
+ case 1200 :
+ command[1] = BAUD_1200;
+ break;
+ case 2400 :
+ command[1] = BAUD_2400;
+ break;
+ case 4800 :
+ command[1] = BAUD_4800;
+ break;
+ case 9600 :
+ command[1] = BAUD_9600;
+ break;
+ case 14400 :
+ command[1] = BAUD_14400;
+ break;
+ case 19200 :
+ command[1] = BAUD_19200;
+ break;
+ case 31250 :
+ command[1] = BAUD_31250;
+ break;
+ case 38400 :
+ command[1] = BAUD_38400;
+ break;
+ case 56000 :
+ command[1] = BAUD_56000;
+ break;
+ case 57600 :
+ command[1] = BAUD_57600;
+ break;
+ case 115200 :
+ command[1] = BAUD_115200;
+ break;
+ case 128000 :
+ command[1] = BAUD_128000;
+ break;
+ case 256000 :
+ command[1] = BAUD_256000;
+ break;
+ default :
+ command[1] = BAUD_9600;
+ speed = 9600;
+ break;
+ }
+
+ int i, resp = 0;
+
+ freeBUFFER();
+
+ for (i = 0; i <2; i++) writeBYTE(command[i]); // send command to serial port
+ _cmd.baud(speed); // set mbed to same speed
+
+ while (!_cmd.readable()) wait_ms(TEMPO); // wait for screen answer
+
+ if (_cmd.readable()) resp = _cmd.getc(); // read response if any
+ switch (resp) {
+ case ACK : // if OK return 1
+ resp = 1;
+ break;
+ case NAK : // if NOK return -1
+ resp = -1;
+ break;
+ default :
+ resp = 0; // else return 0
+ break;
+ }
+}
+
+//******************************************************************************************************
+int TFT_4DGL :: readVERSION(char *command, int number) { // read screen info and populate data
+
+ int i, temp = 0, resp = 0;
+ char response[5] = "";
+
+ freeBUFFER();
+
+ for (i = 0; i < number; i++) writeBYTE(command[i]); // send all chars to serial port
+
+ while (!_cmd.readable()) wait_ms(TEMPO); // wait for screen answer
+
+ while (_cmd.readable() && resp < ARRAY_SIZE(response)) {
+ temp = _cmd.getc();
+ response[resp++] = (char)temp;
+ }
+ switch (resp) {
+ case 5 : // if OK populate data and return 1
+ type = response[0];
+ revision = response[1];
+ firmware = response[2];
+ reserved1 = response[3];
+ reserved2 = response[4];
+ resp = 1;
+ break;
+ default :
+ resp = 0; // else return 0
+ break;
+ }
+ return resp;
+}
+
+//****************************************************************************************************
+void TFT_4DGL :: background_color(int color) { // set screen background color
+ char command[3]= ""; // input color is in 24bits like 0xRRGGBB
+
+ command[0] = BCKGDCOLOR;
+
+ int red5 = (color >> (16 + 3)) & 0x1F; // get red on 5 bits
+ int green6 = (color >> (8 + 2)) & 0x3F; // get green on 6 bits
+ int blue5 = (color >> (0 + 3)) & 0x1F; // get blue on 5 bits
+
+ command[1] = ((red5 << 3) + (green6 >> 3)) & 0xFF; // first part of 16 bits color
+ command[2] = ((green6 << 5) + (blue5 >> 0)) & 0xFF; // second part of 16 bits color
+
+ writeCOMMAND(command, 3);
+}
+
+//****************************************************************************************************
+void TFT_4DGL :: display_control(char mode, char value) { // set screen mode to value
+ char command[3]= "";
+
+ command[0] = DISPCONTROL;
+ command[1] = mode;
+ command[2] = value;
+
+ if (mode == ORIENTATION) {
+ switch (value) {
+ case LANDSCAPE :
+ current_orientation = IS_LANDSCAPE;
+ break;
+ case LANDSCAPE_R :
+ current_orientation = IS_LANDSCAPE;
+ break;
+ case PORTRAIT :
+ current_orientation = IS_PORTRAIT;
+ break;
+ case PORTRAIT_R :
+ current_orientation = IS_PORTRAIT;
+ break;
+ }
+ }
+ writeCOMMAND(command, 3);
+ set_font(current_font);
+}
+
+//****************************************************************************************************
+void TFT_4DGL :: set_volume(char value) { // set sound volume to value
+ char command[2]= "";
+
+ command[0] = SETVOLUME;
+ command[1] = value;
+
+ writeCOMMAND(command, 2);
+}
+
+
+//******************************************************************************************************
+void TFT_4DGL :: getTOUCH(char *command, int number, int *x, int *y) { // read screen info and populate data
+
+#if DEBUGMODE
+ pc.printf("\n");
+ pc.printf("New COMMAND : 0x%02X\n", command[0]);
+#endif
+ int i, temp = 0, resp = 0;
+ char response[5] = "";
+
+ freeBUFFER();
+
+ for (i = 0; i < number; i++) writeBYTE(command[i]); // send all chars to serial port
+
+ while (!_cmd.readable()) wait_ms(TEMPO); // wait for screen answer
+
+ while (_cmd.readable() && resp < ARRAY_SIZE(response)) {
+ temp = _cmd.getc();
+ response[resp++] = (char)temp;
+ }
+
+#if DEBUGMODE
+ pc.printf(" Answer received %d : 0x%02X 0x%02X 0x%02X 0x%02X\n", resp, response[0], response[1], response[2], response[3]);
+#endif
+
+ switch (resp) {
+ case 4 : // if OK populate data
+ *x = ((response[0]<<8)+ response[1]) * (response[0] != 0xFF);
+ *y = ((response[2]<<8)+ response[3]) * (response[2] != 0xFF);
+ break;
+ default :
+ *x = -1;
+ *y = -1;
+ break;
+ }
+
+#if DEBUGMODE
+ pc.printf(" X,Y : %03d,%03d\n", *x, *y);
+#endif
+}
+
+//******************************************************************************************************
+int TFT_4DGL :: getSTATUS(char *command, int number) { // read screen info and populate data
+
+#if DEBUGMODE
+ pc.printf("\n");
+ pc.printf("New COMMAND : 0x%02X\n", command[0]);
+#endif
+
+ int i, temp = 0, resp = 0;
+ char response[5] = "";
+
+ freeBUFFER();
+
+ for (i = 0; i < number; i++) writeBYTE(command[i]); // send all chars to serial port
+
+ while (!_cmd.readable()) wait_ms(TEMPO); // wait for screen answer
+
+ while (_cmd.readable() && resp < ARRAY_SIZE(response)) {
+ temp = _cmd.getc();
+ response[resp++] = (char)temp;
+ }
+ switch (resp) {
+ case 4 :
+ resp = (int)response[1]; // if OK populate data
+ break;
+ default :
+ resp = -1; // else return 0
+ break;
+ }
+
+#if DEBUGMODE
+ pc.printf(" Answer received : %d\n", resp);
+#endif
+
+ return resp;
+}
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