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LVGL+Squareline studio触摸屏应用移植
关于LVGL和Squareline studio
LVGL是一个供嵌入式设备调用开发UI界面的开源库，Squareline studio是LVGL官方推出的图形开发工具，用于加速界面开发，目前个人免费版可使用150个元件和10个屏幕.
LVGL库的机构
以全动电子3.5寸spi串口TFT提供的工程示例为例，这款屏幕是SPI接口负责屏幕显示，IIC负责触摸屏输入。
整体外部引用库有四个如下图所示，lvgl库是基于TFT-espi库的，因此两个都需要，FT6336是触屏库，Tjpg是图片解码库，一般不使用
其中LVGL库的文件夹结构如下所示
espi库的文件夹机构如下所示
示例程序有自己定义的头文件touch.h
屏幕显示引脚在espi库定义（user-setup.h），自己定义的touch.h中有触屏引脚定义，lvgl库lv_config文件有各种配置细节，宏定义0-1，如果用demo，则lv_confi对应的demo中的宏0-1要打开，心跳时钟打开（lv-tick-custom）0-1，字体，fps显示，memory设置（包括外部sram）等等
》touch.h的引脚定义部分
#include <FT6336.h>
#define TOUCH_FT6336
#define TOUCH_FT6336_SCL 25
#define TOUCH_FT6336_SDA 32
#define TOUCH_FT6336_INT -1
#define TOUCH_FT6336_RST 33
》espi库中User_Setup.h中的引脚定义部分
// For ESP32 Dev board (only tested with ILI9341 display)
// The hardware SPI can be mapped to any pins
#define TFT_MISO 12
#define TFT_MOSI 13
#define TFT_SCLK 14
#define TFT_CS 15 // Chip select control pin
#define TFT_DC 2 // Data Command control pin
#define TFT_RST 27 // Reset pin (could connect to RST pin)
Squareline studio工程导出
在Squareline studio软件中export可导出示例工程，导出的工程文件夹如下
这里提供两种方法移植这个导出工程到我们现在开发的工程中。
方法一：将导出工程整体拷贝过去
流程是，platform io中新建开发工程-》将squareline studio导出的工程lib文件夹下lvgl、espi、ui文件夹复制到pio/lib-》espi下user_setup.h修改-》添加触屏库，头文件touch.h-》屏幕厂家的lv_conf.h拷贝到pio/lib/lvgl下-》打开lvgl/src下lv_conf_interna.h修改41行饮用路径../../lv_conf.h为../lv_conf.h-》拷贝屏幕厂家的espi库下user_setup.h,替换pio/espi下的-》拷贝厂家st7796_init.h，替换pio/espi/tft_drivers下的-》根据squareline导出的ui.ino文件修改main.c文件（使用屏幕厂家的main.c，加上ui_init()和头文件）
方法二：只拷贝ui文件夹和lv_conf.h过去
根据squareline导出的ui.ino文件修改main.c文件（使用屏幕厂家的main.c，加上ui_init()和头文件）,lv_conf.h需与厂家的对应一下不同，综合拷贝。
主控程序与ui界面的交互
基本逻辑是，在squareline studio中ui设计时，元件的event和用户插入的function会导出到ui文件夹ui.c文件中，可以在这些函数中与主程序进行交互，主程序中也可以库中的api函数（例如切换屏幕）
///////////////////// FUNCTIONS ////////////////////
void ui_event_Button4( lv_event_t * e) {
lv_event_code_t event_code = lv_event_get_code(e);lv_obj_t * target = lv_event_get_target(e);
if ( event_code == LV_EVENT_CLICKED) {
_ui_screen_change( &ui_Screen2, LV_SCR_LOAD_ANIM_FADE_ON, 500, 0, &ui_Screen2_screen_init);
}
}
void ui_event_Button3( lv_event_t * e) {
lv_event_code_t event_code = lv_event_get_code(e);lv_obj_t * target = lv_event_get_target(e);
if ( event_code == LV_EVENT_CLICKED) {
_ui_screen_change( &ui_Screen1, LV_SCR_LOAD_ANIM_FADE_ON, 500, 0, &ui_Screen1_screen_init);
}
}
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Classic Literature #2: Don Quixote
About the book
Author: Miguel de Cervantes
Original title: El ingenioso hidalgo don Quixote de la Mancha
Country: Spain
Genre: Novel
Publication date:
1605 (Part One)
1615 (Part Two)
Chapter I.
In a village of La Mancha, the name of which I have no desire to call to mind, there lived not long since one of those gentlemen that keep a lance in the lance-rack, an old buckler, a lean hack, and a greyhound for coursing. An olla of rather more beef than mutton, a salad on most nights, scraps on Saturdays, lentils on Fridays, and a pigeon or so extra on Sundays, made away with three-quarters of his income. The rest of it went in a doublet of fine cloth and velvet breeches and shoes to match for holidays, while on week-days he made a brave figure in his best homespun. He had in his house a housekeeper past forty, a niece under twenty, and a lad for the field and market-place, who used to saddle the hack as well as handle the bill-hook. The age of this gentleman of ours was bordering on fifty; he was of a hardy habit, spare, gaunt-featured, a very early riser and a great sportsman. They will have it his surname was Quixada or Quesada (for here there is some difference of opinion among the authors who write on the subject), although from reasonable conjectures it seems plain that he was called Quexana. This, however, is of but little importance to our tale; it will be enough not to stray a hair’s breadth from the truth in the telling of it.
You must know, then, that the above-named gentleman whenever he was at leisure (which was mostly all the year round) gave himself up to reading books of chivalry with such ardour and avidity that he almost entirely neglected the pursuit of his field-sports, and even the management of his property; and to such a pitch did his eagerness and infatuation go that he sold many an acre of tillageland to buy books of chivalry to read, and brought home as many of them as he could get. But of all there were none he liked so well as those of the famous Feliciano de Silva’s composition, for their lucidity of style and complicated conceits were as pearls in his sight, particularly when in his reading he came upon courtships and cartels, where he often found passages like “the reason of the unreason with which my reason is afflicted so weakens my reason that with reason I murmur at your beauty;” or again, “the high heavens, that of your divinity divinely fortify you with the stars, render you deserving of the desert your greatness deserves.” Over conceits of this sort the poor gentleman lost his wits, and used to lie awake striving to understand them and worm the meaning out of them; what Aristotle himself could not have made out or extracted had he come to life again for that special purpose. He was not at all easy about the wounds which Don Belianis gave and took, because it seemed to him that, great as were the surgeons who had cured him, he must have had his face and body covered all over with seams and scars. He commended, however, the author’s way of ending his book with the promise of that interminable adventure, and many a time was he tempted to take up his pen and finish it properly as is there proposed, which no doubt he would have done, and made a successful piece of work of it too, had not greater and more absorbing thoughts prevented him.
Many an argument did he have with the curate of his village (a learned man, and a graduate of Siguenza) as to which had been the better knight, Palmerin of England or Amadis of Gaul. Master Nicholas, the village barber, however, used to say that neither of them came up to the Knight of Phoebus, and that if there was any that could compare with him it was Don Galaor, the brother of Amadis of Gaul, because he had a spirit that was equal to every occasion, and was no finikin knight, nor lachrymose like his brother, while in the matter of valour he was not a whit behind him. In short, he became so absorbed in his books that he spent his nights from sunset to sunrise, and his days from dawn to dark, poring over them; and what with little sleep and much reading his brains got so dry that he lost his wits. His fancy grew full of what he used to read about in his books, enchantments, quarrels, battles, challenges, wounds, wooings, loves, agonies, and all sorts of impossible nonsense; and it so possessed his mind that the whole fabric of invention and fancy he read of was true, that to him no history in the world had more reality in it. He used to say the Cid Ruy Diaz was a very good knight, but that he was not to be compared with the Knight of the Burning Sword who with one back-stroke cut in half two fierce and monstrous giants. He thought more of Bernardo del Carpio because at Roncesvalles he slew Roland in spite of enchantments, availing himself of the artifice of Hercules when he strangled Antaeus the son of Terra in his arms. He approved highly of the giant Morgante, because, although of the giant breed which is always arrogant and ill-conditioned, he alone was affable and well-bred. But above all he admired Reinaldos of Montalban, especially when he saw him sallying forth from his castle and robbing everyone he met, and when beyond the seas he stole that image of Mahomet which, as his history says, was entirely of gold. To have a bout of kicking at that traitor of a Ganelon he would have given his housekeeper, and his niece into the bargain.
In short, his wits being quite gone, he hit upon the strangest notion that ever madman in this world hit upon, and that was that he fancied it was right and requisite, as well for the support of his own honour as for the service of his country, that he should make a knight-errant of himself, roaming the world over in full armour and on horseback in quest of adventures, and putting in practice himself all that he had read of as being the usual practices of knights-errant; righting every kind of wrong, and exposing himself to peril and danger from which, in the issue, he was to reap eternal renown and fame. Already the poor man saw himself crowned by the might of his arm Emperor of Trebizond at least; and so, led away by the intense enjoyment he found in these pleasant fancies, he set himself forthwith to put his scheme into execution.
The first thing he did was to clean up some armour that had belonged to his great-grandfather, and had been for ages lying forgotten in a corner eaten with rust and covered with mildew. He scoured and polished it as best he could, but he perceived one great defect in it, that it had no closed helmet, nothing but a simple morion. This deficiency, however, his ingenuity supplied, for he contrived a kind of half-helmet of pasteboard which, fitted on to the morion, looked like a whole one. It is true that, in order to see if it was strong and fit to stand a cut, he drew his sword and gave it a couple of slashes, the first of which undid in an instant what had taken him a week to do. The ease with which he had knocked it to pieces disconcerted him somewhat, and to guard against that danger he set to work again, fixing bars of iron on the inside until he was satisfied with its strength; and then, not caring to try any more experiments with it, he passed it and adopted it as a helmet of the most perfect construction.
He next proceeded to inspect his hack, which, with more quartos than a real and more blemishes than the steed of Gonela, that “tantum pellis et ossa fuit,” surpassed in his eyes the Bucephalus of Alexander or the Babieca of the Cid. Four days were spent in thinking what name to give him, because (as he said to himself) it was not right that a horse belonging to a knight so famous, and one with such merits of his own, should be without some distinctive name, and he strove to adapt it so as to indicate what he had been before belonging to a knight-errant, and what he then was; for it was only reasonable that, his master taking a new character, he should take a new name, and that it should be a distinguished and full-sounding one, befitting the new order and calling he was about to follow. And so, after having composed, struck out, rejected, added to, unmade, and remade a multitude of names out of his memory and fancy, he decided upon calling him Rocinante, a name, to his thinking, lofty, sonorous, and significant of his condition as a hack before he became what he now was, the first and foremost of all the hacks in the world.
Having got a name for his horse so much to his taste, he was anxious to get one for himself, and he was eight days more pondering over this point, till at last he made up his mind to call himself “Don Quixote,” whence, as has been already said, the authors of this veracious history have inferred that his name must have been beyond a doubt Quixada, and not Quesada as others would have it. Recollecting, however, that the valiant Amadis was not content to call himself curtly Amadis and nothing more, but added the name of his kingdom and country to make it famous, and called himself Amadis of Gaul, he, like a good knight, resolved to add on the name of his, and to style himself Don Quixote of La Mancha, whereby, he considered, he described accurately his origin and country, and did honour to it in taking his surname from it.
So then, his armour being furbished, his morion turned into a helmet, his hack christened, and he himself confirmed, he came to the conclusion that nothing more was needed now but to look out for a lady to be in love with; for a knight-errant without love was like a tree without leaves or fruit, or a body without a soul. As he said to himself, “If, for my sins, or by my good fortune, I come across some giant hereabouts, a common occurrence with knights-errant, and overthrow him in one onslaught, or cleave him asunder to the waist, or, in short, vanquish and subdue him, will it not be well to have some one I may send him to as a present, that he may come in and fall on his knees before my sweet lady, and in a humble, submissive voice say, ‘I am the giant Caraculiambro, lord of the island of Malindrania, vanquished in single combat by the never sufficiently extolled knight Don Quixote of La Mancha, who has commanded me to present myself before your Grace, that your Highness dispose of me at your pleasure’?” Oh, how our good gentleman enjoyed the delivery of this speech, especially when he had thought of some one to call his Lady! There was, so the story goes, in a village near his own a very good-looking farm-girl with whom he had been at one time in love, though, so far as is known, she never knew it nor gave a thought to the matter. Her name was Aldonza Lorenzo, and upon her he thought fit to confer the title of Lady of his Thoughts; and after some search for a name which should not be out of harmony with her own, and should suggest and indicate that of a princess and great lady, he decided upon calling her Dulcinea del Toboso—she being of El Toboso—a name, to his mind, musical, uncommon, and significant, like all those he had already bestowed upon himself and the things belonging to him.
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Classic Literature #1: Romeo and Juliet
About the book
Author: William Shakespeare
Country: England
Genre: Shakespearean tragedy
Publication date: 1597
Synopsis
The prologue of Romeo and Juliet calls the title characters “star-crossed lovers”—and the stars do seem to conspire against these young lovers.
Romeo is a Montague, and Juliet a Capulet. Their families are enmeshed in a feud, but the moment they meet—when Romeo and his friends attend a party at Juliet’s house in disguise—the two fall in love and quickly decide that they want to be married.
A friar secretly marries them, hoping to end the feud. Romeo and his companions almost immediately encounter Juliet’s cousin Tybalt, who challenges Romeo. When Romeo refuses to fight, Romeo’s friend Mercutio accepts the challenge and is killed. Romeo then kills Tybalt and is banished. He spends that night with Juliet and then leaves for Mantua.
Juliet’s father forces her into a marriage with Count Paris. To avoid this marriage, Juliet takes a potion, given her by the friar, that makes her appear dead. The friar will send Romeo word to be at her family tomb when she awakes. The plan goes awry, and Romeo learns instead that she is dead. In the tomb, Romeo kills himself. Juliet wakes, sees his body, and commits suicide. Their deaths appear finally to end the feud.
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My personal Online Library
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非洲第一白的小站
