TFT_Touch_Shield - Library files for using Seeed Studio TFT Touch Sh…

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Elmicro Computer / Mbed 2 deprecated TFT_Touch_Shield

Library files for using Seeed Studio TFT Touch Shield for Arduino (ST7781R controller) together with ELMICRO TestBed for mbed. Featuring a short example program of how to calibrate the touch screen. Some basic drawing functions are also included (circle, rectangle, lines, text).

Dependencies: mbed

main.cpp@0:db0d63650413, 2012-06-28 (annotated)

Committer:: elmicro
Date:: Thu Jun 28 10:12:07 2012 +0000
Revision:: 0:db0d63650413

Who changed what in which revision?

User	Revision	Line number	New contents of line
elmicro	0:db0d63650413	1	/*###########################################################
elmicro	0:db0d63650413	2	Interface library and example program for
elmicro	0:db0d63650413	3	Seeed Studio's TFT Touch Shield
elmicro	0:db0d63650413	4
elmicro	0:db0d63650413	5	---
elmicro	0:db0d63650413	6
elmicro	0:db0d63650413	7	!DESOLDERING OF TESTBED PARTS NEEDED!
elmicro	0:db0d63650413	8	To use the touch input, desolder C3 and R34
elmicro	0:db0d63650413	9	This disables the analogue trimmer R36!
elmicro	0:db0d63650413	10
elmicro	0:db0d63650413	11	---
elmicro	0:db0d63650413	12	(C) 2012 Stefan Guenther
elmicro	0:db0d63650413	13	Elektronikladen \| ELMICRO
elmicro	0:db0d63650413	14	########################################################### */
elmicro	0:db0d63650413	15
elmicro	0:db0d63650413	16	#include "mbed.h"
elmicro	0:db0d63650413	17	#include "shortcuts.h"
elmicro	0:db0d63650413	18	#include "TFT.h"
elmicro	0:db0d63650413	19	#include "2d_draw.h"
elmicro	0:db0d63650413	20	#include "touch.h"
elmicro	0:db0d63650413	21
elmicro	0:db0d63650413	22
elmicro	0:db0d63650413	23	/* ===================================================================
elmicro	0:db0d63650413	24	routine: IntToChars
elmicro	0:db0d63650413	25	purpose: Converts integer value into char array with
elmicro	0:db0d63650413	26	selectable number base
elmicro	0:db0d63650413	27	parameters: <*buffer> pointer to character array
elmicro	0:db0d63650413	28	<value> integer value to convert
elmicro	0:db0d63650413	29	<spaceonbuffer> max nr. of characters in buffer
elmicro	0:db0d63650413	30	<countbase> e.g. 16->HEX formatted string
elmicro	0:db0d63650413	31	2->BIN formatted string
elmicro	0:db0d63650413	32	10->DEC formatted string
elmicro	0:db0d63650413	33	date: 2007-05-07
elmicro	0:db0d63650413	34	author: Phantomix
elmicro	0:db0d63650413	35	http://www.roboternetz.de/community/archive/index.php
elmicro	0:db0d63650413	36	/t-26986.html?s=c3edf0ef1df246f02c67dfa7f316a03f
elmicro	0:db0d63650413	37	-------------------------------------------------------------------*/
elmicro	0:db0d63650413	38	void IntToChars (char* buffer, int value, int spaceonbuffer, int countbase)
elmicro	0:db0d63650413	39	{
elmicro	0:db0d63650413	40	int workvalue = value;
elmicro	0:db0d63650413	41	int i;
elmicro	0:db0d63650413	42	int valuetowrite;
elmicro	0:db0d63650413	43	int end_i = 0;
elmicro	0:db0d63650413	44
elmicro	0:db0d63650413	45	if (value < 0)
elmicro	0:db0d63650413	46	{
elmicro	0:db0d63650413	47	workvalue = -value;
elmicro	0:db0d63650413	48	end_i = 1;
elmicro	0:db0d63650413	49	buffer[0] = '-';
elmicro	0:db0d63650413	50	}
elmicro	0:db0d63650413	51
elmicro	0:db0d63650413	52	for (i = spaceonbuffer - 1; i >= end_i; i--)
elmicro	0:db0d63650413	53	{
elmicro	0:db0d63650413	54	valuetowrite = (workvalue % countbase);
elmicro	0:db0d63650413	55	if (workvalue == 0)
elmicro	0:db0d63650413	56	{
elmicro	0:db0d63650413	57	if (i == (spaceonbuffer - 1))
elmicro	0:db0d63650413	58	{
elmicro	0:db0d63650413	59	buffer[i] = 48; // ASCII 0
elmicro	0:db0d63650413	60	} else {
elmicro	0:db0d63650413	61	buffer[i] = 32; // ASCII SPACE
elmicro	0:db0d63650413	62	}
elmicro	0:db0d63650413	63	} else {
elmicro	0:db0d63650413	64	if (valuetowrite > 9)
elmicro	0:db0d63650413	65	{
elmicro	0:db0d63650413	66	buffer[i] = valuetowrite + 55; // ASCII A-Z
elmicro	0:db0d63650413	67	} else {
elmicro	0:db0d63650413	68	buffer[i] = valuetowrite + 48; // ASCII of that character
elmicro	0:db0d63650413	69	}
elmicro	0:db0d63650413	70	};
elmicro	0:db0d63650413	71	workvalue = (workvalue - valuetowrite) / countbase;
elmicro	0:db0d63650413	72	}
elmicro	0:db0d63650413	73	}
elmicro	0:db0d63650413	74
elmicro	0:db0d63650413	75
elmicro	0:db0d63650413	76
elmicro	0:db0d63650413	77	int main() {
elmicro	0:db0d63650413	78
elmicro	0:db0d63650413	79	unsigned int x, y, z;
elmicro	0:db0d63650413	80	unsigned int X1, X2, Y1, Y2;
elmicro	0:db0d63650413	81	unsigned int x_old = 0;
elmicro	0:db0d63650413	82	unsigned int y_old = 0;
elmicro	0:db0d63650413	83
elmicro	0:db0d63650413	84	char charX[] = "1111"; //dummy init values
elmicro	0:db0d63650413	85	char charY[] = "2222";
elmicro	0:db0d63650413	86	char charZ[] = "2222";
elmicro	0:db0d63650413	87
elmicro	0:db0d63650413	88	Init(); //prepare mbed's I/Os for use with TFT Touch Shield
elmicro	0:db0d63650413	89	TouchInit(); //prepare ADC inputs for touch input
elmicro	0:db0d63650413	90
elmicro	0:db0d63650413	91
elmicro	0:db0d63650413	92	/* CALIBRATE TOUCH SCREEN */
elmicro	0:db0d63650413	93	/* Alignment of touch input sensor with TFT display
elmicro	0:db0d63650413	94	using 2 touch inputs from opposite edges of screen
elmicro	0:db0d63650413	95	(10% distance to each borders)*/
elmicro	0:db0d63650413	96
elmicro	0:db0d63650413	97	DrawString("CALIBRATION SEQUENCE", 30, 140, 1, YELLOW);
elmicro	0:db0d63650413	98	DrawString("Please tap the circles!", 10, 150, 1, YELLOW);
elmicro	0:db0d63650413	99	DrawCircle(24, 32, 10, WHITE); //draw circle 10% right and 10% down from
elmicro	0:db0d63650413	100	//upper left corner
elmicro	0:db0d63650413	101	int ret = 0;
elmicro	0:db0d63650413	102	do //repeat until touch is recognized
elmicro	0:db0d63650413	103	{
elmicro	0:db0d63650413	104	ret = GetRawTouch(&x, &y, &z);
elmicro	0:db0d63650413	105	} while(ret == 0);
elmicro	0:db0d63650413	106
elmicro	0:db0d63650413	107	IntToChars(charX, x, 4, 10); //convert raw touch input coordinates
elmicro	0:db0d63650413	108	IntToChars(charY, y, 4, 10); //into character string for verbose
elmicro	0:db0d63650413	109	IntToChars(charZ, z, 4, 10); //display
elmicro	0:db0d63650413	110
elmicro	0:db0d63650413	111	DrawCircle(24, 32, 10, BLACK); //let first circle disappear
elmicro	0:db0d63650413	112	X1 = x; //save coordinates of first touch
elmicro	0:db0d63650413	113	Y1 = y;
elmicro	0:db0d63650413	114	wait(1);
elmicro	0:db0d63650413	115
elmicro	0:db0d63650413	116	DrawString(charX, 10, 17, 1, RED); //output read values
elmicro	0:db0d63650413	117	DrawString(charY, 10, 32, 1, RED);
elmicro	0:db0d63650413	118	DrawString(charZ, 10, 47, 1, RED);
elmicro	0:db0d63650413	119
elmicro	0:db0d63650413	120	DrawCircle(216, 288, 10, WHITE); //display next circle, 90% right and 90% down
elmicro	0:db0d63650413	121	//from upper left corner
elmicro	0:db0d63650413	122	ret=0;
elmicro	0:db0d63650413	123	do //do the same for second touch point
elmicro	0:db0d63650413	124	{
elmicro	0:db0d63650413	125	ret=GetRawTouch(&x, &y, &z);
elmicro	0:db0d63650413	126	} while(ret == 0);
elmicro	0:db0d63650413	127
elmicro	0:db0d63650413	128
elmicro	0:db0d63650413	129	IntToChars(charX, x, 4, 10);
elmicro	0:db0d63650413	130	IntToChars(charY, y, 4, 10);
elmicro	0:db0d63650413	131	IntToChars(charZ, z, 4, 10);
elmicro	0:db0d63650413	132
elmicro	0:db0d63650413	133	DrawCircle(216, 288, 10, BLACK);
elmicro	0:db0d63650413	134	X2 = x;
elmicro	0:db0d63650413	135	Y2 = y;
elmicro	0:db0d63650413	136	wait(1);
elmicro	0:db0d63650413	137
elmicro	0:db0d63650413	138	DrawString(charX, 200,273, 1, RED);
elmicro	0:db0d63650413	139	DrawString(charY, 200,288, 1, RED);
elmicro	0:db0d63650413	140	DrawString(charZ, 200,303, 1, RED);
elmicro	0:db0d63650413	141
elmicro	0:db0d63650413	142	TFTData.Xmin = (9 * X1 - X2) / 8; //start calculation of scale and alignment values
elmicro	0:db0d63650413	143	TFTData.Xmax = (9 * X2 - X1) / 8; //and save them into TFT parameter structure
elmicro	0:db0d63650413	144	TFTData.Ymin = (9 * Y1 - Y2) / 8; //this structure should be saved into non-volatile
elmicro	0:db0d63650413	145	TFTData.Ymax = (9 * Y2 - Y1) / 8; //(e.g. mbed's on-board 2MB flash chip)
elmicro	0:db0d63650413	146
elmicro	0:db0d63650413	147	TFTData.Xscale = ( (TFTData.Xmax - TFTData.Xmin) * 1000 ) / TFTData.XRes;
elmicro	0:db0d63650413	148	TFTData.Xscale = ( (TFTData.Ymax - TFTData.Ymin) * 1000 ) / TFTData.YRes;
elmicro	0:db0d63650413	149
elmicro	0:db0d63650413	150	DrawString("Please tap the circles!", 10, 150, 1, BLACK);
elmicro	0:db0d63650413	151	DrawString("COMPLETED", 30, 150, 1, YELLOW);
elmicro	0:db0d63650413	152	wait(1);
elmicro	0:db0d63650413	153
elmicro	0:db0d63650413	154	ClearScreen(BLACK);
elmicro	0:db0d63650413	155	wait(0.3);
elmicro	0:db0d63650413	156
elmicro	0:db0d63650413	157	DrawString("DEMO MODE", 30, 140, 1, YELLOW);
elmicro	0:db0d63650413	158	DrawString("Touch the screen...", 10, 150, 1, YELLOW);
elmicro	0:db0d63650413	159
elmicro	0:db0d63650413	160
elmicro	0:db0d63650413	161	while(1)
elmicro	0:db0d63650413	162	{
elmicro	0:db0d63650413	163	wait_ms(1);
elmicro	0:db0d63650413	164
elmicro	0:db0d63650413	165	if(GetPoint(&x, &y)==1) //check if touch appears
elmicro	0:db0d63650413	166	{
elmicro	0:db0d63650413	167	DrawCircle(x_old, y_old, 15, BLACK); //clear last touch indicator circle
elmicro	0:db0d63650413	168	DrawString("DEMO MODE", 30, 140, 1, YELLOW);
elmicro	0:db0d63650413	169	DrawString("Touch the screen...", 10, 150, 1, YELLOW);
elmicro	0:db0d63650413	170	DrawCircle(x, y, 15, YELLOW); //set new indicator circle
elmicro	0:db0d63650413	171
elmicro	0:db0d63650413	172	x_old=x; //rescue current touch values for next cycle
elmicro	0:db0d63650413	173	y_old=y;
elmicro	0:db0d63650413	174	}
elmicro	0:db0d63650413	175	}
elmicro	0:db0d63650413	176	}
elmicro	0:db0d63650413	177
elmicro	0:db0d63650413	178

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	27 Jun 2012
Imports:	464
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	13

main.cpp@0:db0d63650413, 2012-06-28 (annotated)

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