一.OLED简介$ N$ p: e& Z. U p
OLED,即有机发光二极管(Organic Light-Emitting Diode),又称为有机电激光显示(OrganicElectroluminesence Display, OELD)。 OLED 由于同时具备自发光,不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异之特性,被认为是下一代的平面显示器新兴应用技术。6 h3 Q' q6 I5 v* z& B7 ]
模块特点:6 n" [; z9 l' L
没有背光,需要通过写入指令来开启显示3 J+ J3 s( K3 f: ^1 S# T5 {+ e W
尺寸小:0.96寸,分辨率高:128*64/ n" A, y4 {( W
提供多种通信接口:6800、8080、3线/4线SPI、IIC
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/ m- L e4 f2 o% r, j6 y' O$ D需要改变模块的通信接口时,只需要改变模块背后的电阻位置即可,如示:
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7 g. p3 p1 H) O* j& r* U我是使用4线SPI驱动OLED的。% ], O% F2 [) ]. k- ~
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, J) u2 b7 p0 o# |" E" |2 G7 J( y二.驱动SSD1306所需知识
. v% U. e- y5 ?) {& `1 V4 H0 q1.引脚介绍
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3 g# p v" A' ~1 v' e }6 |如图所示,各引脚的介绍如下:8 J& V6 f/ Q0 {$ Q
GND:接地引脚6 p; f+ P7 `5 C0 d. s( D% a0 Q
VCC:接电源引脚,接3.3V直流电源即可
% Y# D3 R, S( E' d5 XD0:SPI的时钟线SCLK
* r E6 L8 E- Z5 Y# m1 e% bD1:SPI的数据线SDIN: ~/ j7 s. Z5 y4 H$ p. Z; w* r; u
RES:复位接口,低电平初始化(复位),正常时高电平
t" Z/ `! A/ f5 N; Q2 D& { U' iDC:用来选择命令or数据,低电平命令,高电平数据4 z( C6 [& l/ w% S# R0 z: u' _
CS:片选线: O( ^+ f! F% M& M5 V
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注意:4线SPI模式时,只能写,不能读!, |- N+ C0 B' d# U7 z
在本文的代码中,对应的接口如下:+ M3 j% a) a4 v9 D, C' G
SCLK C0 D0. p1 j" v6 I' F3 O1 g' `1 V; J
SDIN C1 D1
1 @- z/ B$ R. z% e2 bRES G15 拉低时初始化(复位),正常时拉高; M9 B$ Y4 a' V% t6 W9 I& j
DC D3 (0:命令 1:数据)
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$ w5 e! Y, ]8 j# Z( c, v+ j2.通信时序& Y2 D( j9 b' V
单片机与OLED通信是4线SPI,每个数据长度为8位,在SCLK的上升沿数据有效,在上升沿数据从SDIN移入SSD1306,高位先行,D/C用来说明是传输命令还是数据。其通信时序图如示:
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. h; q& c1 N9 O1 j由图知,SSD1306与单片机通信可以分为如下几步:
4 N G G" w+ O8 F8 y1.拉低片选CS,作为正常通信的前提
- h% T% w6 Y' J7 b. i2.根据需求操作D/C,低电平代表传输命令,高电平代表传输数据 w% q+ k/ |* A4 f* S+ q- M
3.时钟线SCLK不断产生时钟信号,上升沿数据线有效
: N# P6 B5 Q( G/ H4.数据线SDIN根据SCLK的上升沿,从高位开始传输一帧数据(8位),置高代表1,拉低代表0
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3.显存GRAM
, Q; `; d/ X) j2 ?在OLED上显示图像,图像的数据就存储在显存GRAM中,由于SSD1306的分辨率是128*64,代表屏幕上总共有128x64个像素点,所以其显存大小就是128x64bit,恰好可以存储一帧图像的信息。
. r0 f6 a$ J/ J: x m( c& I3 E/ YSSD1306的在逻辑上把GRAM分为8页,每页包含128个字节(1个字节8位),即8x128x8=128x64,所以屏幕上的每一个像素点都对应着GRAM中的每一位,要想点亮屏幕上的某一个像素点,只要在开启显示的前提下,将GRAM中的相应位置一即可。% O9 g( P/ K0 b. R5 I
SSD1306的GRAM与屏幕上像素点的对应关系表如示:: _- g7 T/ B _) v, f3 u
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以屏幕的左上角为原点,可以想象出一副坐标系,屏幕的大小范围就是x:0~ 127,y:0~64,实际上我们后续画点也是以此为基础的!
; q+ p" g. X: e% J! f我们用一个二维数组来抽象的映射出屏幕上的每一个像素点:! p p4 D6 |" _3 E2 L6 s/ U* M
- /* OLED的显存 */4 {" b5 ?+ z, f; A: E. {1 p3 g5 ]
- uint8_t OLED_GRAM[128][8];% t$ t+ u- \/ \" n, t& v. y
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- OLED_GRAM[128][8]中是8位二进制为一个单位
* C/ E7 I! n) _2 d5 X k - 其逻辑排序如示:(高位先行) K! N; V- z! S! e" c* P( f2 Z
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复制代码 , G, k2 r* _0 [; e6 u7 n+ e$ K
到此,我们只需要把要显示图像的信息写入OLED_GRAM[128][8]数组中,再通过画点函数操作OLED_GRAM[128][8]中的每一位对应的像素点,就可以在OLED屏幕中显示图像了。) ~# i8 x; O* {6 Z
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' T7 ~. c- c) c/ U4.字库 y+ i T. t) }) D
要在屏幕中显示图像,最常见的是显示一些字符,这个时候就需要这些字符的图像信息了,这就涉及到字库。我理解,一个包含了一些字符图像的数组就可以称作字库,这样做的好处就是,可以根据所要显示的字符直接从字库中提取图像信息到GRAM,这样显示字符就方便多了。9 {1 s, G+ B7 G9 g8 x# W
本项目所使用的字库大小有(高x宽):12x6、16x8、24x121 y* ]3 n6 R8 S. }3 A
而且字库的取模方式:阴码+逐列式+顺向+C51格式(用了取模软件PC2LCD2002)
4 C* ?$ _" F( {* P. P1 @每个字符所占用的字节数为 size/8+((size%8)?1:0))*(size/2),其中size:是字库生成时的点阵大小' u% C& T: T" l2 W7 R3 l/ v, E
比如12x6字库信息如示:
8 u j6 Z+ W* a H b- //12*6 ASCII字符集点阵
: u( s7 e8 `6 U$ D# b8 o - const unsigned char asc2_1206[95][12]={, E$ v) ~% x W1 N2 H* A* A7 }$ d
- {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/+ @4 i: C' n5 A3 P6 s9 J7 s- t% f
- {0x00,0x00,0x00,0x00,0x3F,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*"!",1*/4 F/ J: Z( w: ?3 [3 M
- {0x00,0x00,0x30,0x00,0x40,0x00,0x30,0x00,0x40,0x00,0x00,0x00},/*""",2*/
, r+ A) p, E3 l2 l5 A+ N" ? - {0x09,0x00,0x0B,0xC0,0x3D,0x00,0x0B,0xC0,0x3D,0x00,0x09,0x00},/*"#",3*/
$ e- T6 D. M4 |6 r - {0x18,0xC0,0x24,0x40,0x7F,0xE0,0x22,0x40,0x31,0x80,0x00,0x00},/*"$",4*/
' U* f! l8 y7 c3 k3 ^" N2 `4 V - {0x18,0x00,0x24,0xC0,0x1B,0x00,0x0D,0x80,0x32,0x40,0x01,0x80},/*"%",5*/
0 t" M# x9 P$ m- ~% N - {0x03,0x80,0x1C,0x40,0x27,0x40,0x1C,0x80,0x07,0x40,0x00,0x40},/*"&",6*/) C4 x- ~1 O* _4 U, h
- {0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/
8 B4 u% R. u% G' b9 ]- P% C4 g- n - {0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x80,0x20,0x40,0x40,0x20},/*"(",8*/
' z$ t) E9 W4 T/ M; t; o5 a1 X7 K - {0x00,0x00,0x40,0x20,0x20,0x40,0x1F,0x80,0x00,0x00,0x00,0x00},/*")",9*/
+ T& b- \7 v1 v! ~! s! z - {0x09,0x00,0x06,0x00,0x1F,0x80,0x06,0x00,0x09,0x00,0x00,0x00},/*"*",10*/ I6 r8 U; \5 |; M8 C) d8 d' O0 ~
- {0x04,0x00,0x04,0x00,0x3F,0x80,0x04,0x00,0x04,0x00,0x00,0x00},/*"+",11*/2 C/ x8 n* d. m8 `
- {0x00,0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*",",12*/% A. O1 @- C5 @4 ^, T
- {0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x00,0x00},/*"-",13*/# ~6 i) q7 R' F& Y
- {0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*".",14*/
: ^" I8 Q2 a" L - {0x00,0x20,0x01,0xC0,0x06,0x00,0x38,0x00,0x40,0x00,0x00,0x00},/*"/",15*/
" m+ U P1 {+ i( F& z* ] - {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"0",16*/# Q [5 g6 C- S1 j
- {0x00,0x00,0x10,0x40,0x3F,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"1",17*/
3 [3 q6 P1 ]6 `+ \6 r2 W9 z2 K/ B - {0x18,0xC0,0x21,0x40,0x22,0x40,0x24,0x40,0x18,0x40,0x00,0x00},/*"2",18*/7 R! G: R9 `, z* y: \+ l
- {0x10,0x80,0x20,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"3",19*/# x, b7 X. C) j R2 j) _7 t
- {0x02,0x00,0x0D,0x00,0x11,0x00,0x3F,0xC0,0x01,0x40,0x00,0x00},/*"4",20*/2 N2 `! v' t8 g5 \
- {0x3C,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x23,0x80,0x00,0x00},/*"5",21*/% f4 O$ }( l! w$ e
- {0x1F,0x80,0x24,0x40,0x24,0x40,0x34,0x40,0x03,0x80,0x00,0x00},/*"6",22*/# {5 b3 z0 s% o& Y2 \
- {0x30,0x00,0x20,0x00,0x27,0xC0,0x38,0x00,0x20,0x00,0x00,0x00},/*"7",23*/
* J6 m( A" V. b9 |: m! k$ A - {0x1B,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"8",24*/
9 T$ a0 A' E: [- d( h - {0x1C,0x00,0x22,0xC0,0x22,0x40,0x22,0x40,0x1F,0x80,0x00,0x00},/*"9",25*/3 C/ \+ K- D' U: P5 n
- {0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*":",26*/% V+ I# S" z; Y4 c
- {0x00,0x00,0x00,0x00,0x04,0x60,0x00,0x00,0x00,0x00,0x00,0x00},/*";",27*/+ S% f& z+ a/ E! f1 s, K- M# ?
- {0x00,0x00,0x04,0x00,0x0A,0x00,0x11,0x00,0x20,0x80,0x40,0x40},/*"<",28*/
R [( x3 `7 X0 v - {0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x00,0x00},/*"=",29*/
. [0 T( x/ B! U' g - {0x00,0x00,0x40,0x40,0x20,0x80,0x11,0x00,0x0A,0x00,0x04,0x00},/*">",30*/
9 q+ H, K8 T9 v1 b - {0x18,0x00,0x20,0x00,0x23,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"?",31*/8 V5 n4 U! ^: e" Z$ Q& j
- {0x1F,0x80,0x20,0x40,0x27,0x40,0x29,0x40,0x1F,0x40,0x00,0x00},/*"@",32*/% f5 P% H8 T. H, N# h2 @, Z
- {0x00,0x40,0x07,0xC0,0x39,0x00,0x0F,0x00,0x01,0xC0,0x00,0x40},/*"A",33*/& A; H' c. Q& S2 Y3 Z3 S+ y
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"B",34*/
5 P: O3 T" ^- X/ ^' { - {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x30,0x80,0x00,0x00},/*"C",35*/$ u1 J& N; |3 w! S8 D% M
- {0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"D",36*/5 s, B: T$ s; s" G
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x40,0x30,0xC0,0x00,0x00},/*"E",37*/" L; S$ D7 K# ]" p9 v1 ]) u; D8 a: X% T
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x00,0x30,0x00,0x00,0x00},/*"F",38*/ }- q6 j- E& h" Y, \6 [
- {0x0F,0x00,0x10,0x80,0x20,0x40,0x22,0x40,0x33,0x80,0x02,0x00},/*"G",39*/$ I% {3 d5 l8 n/ z3 x; B# B5 p
- {0x20,0x40,0x3F,0xC0,0x04,0x00,0x04,0x00,0x3F,0xC0,0x20,0x40},/*"H",40*// x! K+ W/ u" |6 w2 d: J" [4 M
- {0x20,0x40,0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x00,0x00},/*"I",41*/8 A/ }# ]2 } n- I( |4 `: a2 |
- {0x00,0x60,0x20,0x20,0x20,0x20,0x3F,0xC0,0x20,0x00,0x20,0x00},/*"J",42*/- A* u& i: [( H" J
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x0B,0x00,0x30,0xC0,0x20,0x40},/*"K",43*/
! L9 g9 \* b- ]- F; G& l - {0x20,0x40,0x3F,0xC0,0x20,0x40,0x00,0x40,0x00,0x40,0x00,0xC0},/*"L",44*/- z/ z0 X; O3 I" x/ ^: u4 q
- {0x3F,0xC0,0x3C,0x00,0x03,0xC0,0x3C,0x00,0x3F,0xC0,0x00,0x00},/*"M",45*/% p4 j6 c# P' A7 I2 A w# K D. Q
- {0x20,0x40,0x3F,0xC0,0x0C,0x40,0x23,0x00,0x3F,0xC0,0x20,0x00},/*"N",46*/: [: ^ ^. V; v( ?- u1 d9 f0 o' Q1 n
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"O",47*/+ R T- g" {/ X1 V5 J) }
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"P",48*/
. }) h* O1 h) B4 m( X! S5 S - {0x1F,0x80,0x21,0x40,0x21,0x40,0x20,0xE0,0x1F,0xA0,0x00,0x00},/*"Q",49*/* B5 k* E% ?" Y# u/ ?/ ^7 T
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x26,0x00,0x19,0xC0,0x00,0x40},/*"R",50*/
; i Q I8 F$ k: K5 a! Y! z4 | - {0x18,0xC0,0x24,0x40,0x24,0x40,0x22,0x40,0x31,0x80,0x00,0x00},/*"S",51*/# t' d+ ^: U0 ]8 C( e
- {0x30,0x00,0x20,0x40,0x3F,0xC0,0x20,0x40,0x30,0x00,0x00,0x00},/*"T",52*/2 E! }& }; ]1 `4 \9 U4 R- J
- {0x20,0x00,0x3F,0x80,0x00,0x40,0x00,0x40,0x3F,0x80,0x20,0x00},/*"U",53*/8 n) q3 @9 ~4 w, s8 n1 m9 d: m0 w- M
- {0x20,0x00,0x3E,0x00,0x01,0xC0,0x07,0x00,0x38,0x00,0x20,0x00},/*"V",54*/
, F3 o5 m% ^) C! ^. h - {0x38,0x00,0x07,0xC0,0x3C,0x00,0x07,0xC0,0x38,0x00,0x00,0x00},/*"W",55*/0 _! a5 d1 J) L; ]: c' ]& ?: L# \
- {0x20,0x40,0x39,0xC0,0x06,0x00,0x39,0xC0,0x20,0x40,0x00,0x00},/*"X",56*/7 d H) r. |" h9 m4 `& x( y
- {0x20,0x00,0x38,0x40,0x07,0xC0,0x38,0x40,0x20,0x00,0x00,0x00},/*"Y",57*/
8 `$ X7 {& A' x* i+ [ - {0x30,0x40,0x21,0xC0,0x26,0x40,0x38,0x40,0x20,0xC0,0x00,0x00},/*"Z",58*/2 m- C, Y! \% h6 _9 p M* p& e' `
- {0x00,0x00,0x00,0x00,0x7F,0xE0,0x40,0x20,0x40,0x20,0x00,0x00},/*"[",59*/
) E+ M1 J- f+ H# S, Y - {0x00,0x00,0x70,0x00,0x0C,0x00,0x03,0x80,0x00,0x40,0x00,0x00},/*"",60*/# ` v8 @2 T) @3 m
- {0x00,0x00,0x40,0x20,0x40,0x20,0x7F,0xE0,0x00,0x00,0x00,0x00},/*"]",61*/
c! u% `. z7 ] - {0x00,0x00,0x20,0x00,0x40,0x00,0x20,0x00,0x00,0x00,0x00,0x00},/*"^",62*/. L: t% v3 k; F+ p
- {0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10},/*"_",63*/+ G3 K' P2 S2 `1 C9 }- E X
- {0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/
! r( c0 N5 K& B7 ~ - {0x00,0x00,0x02,0x80,0x05,0x40,0x05,0x40,0x03,0xC0,0x00,0x40},/*"a",65*/
! c5 x& n/ j f% N8 d, w' H - {0x20,0x00,0x3F,0xC0,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"b",66*/
9 K7 j9 E8 P/ j# ?! K - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x06,0x40,0x00,0x00},/*"c",67*/: r6 p# X( I; d+ @
- {0x00,0x00,0x03,0x80,0x04,0x40,0x24,0x40,0x3F,0xC0,0x00,0x40},/*"d",68*/
# I, h2 C. A/ K( T4 g( u: j G - {0x00,0x00,0x03,0x80,0x05,0x40,0x05,0x40,0x03,0x40,0x00,0x00},/*"e",69*/
1 v/ U' M( w: F7 ^3 I - {0x00,0x00,0x04,0x40,0x1F,0xC0,0x24,0x40,0x24,0x40,0x20,0x00},/*"f",70*/) t3 k v9 N5 b1 F. ~
- {0x00,0x00,0x02,0xE0,0x05,0x50,0x05,0x50,0x06,0x50,0x04,0x20},/*"g",71*/2 L: [7 C) O' a9 w1 G8 X+ l
- {0x20,0x40,0x3F,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"h",72*/. [; H) H7 C' B5 Y
- {0x00,0x00,0x04,0x40,0x27,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"i",73*/4 t1 T5 S( F3 W; v
- {0x00,0x10,0x00,0x10,0x04,0x10,0x27,0xE0,0x00,0x00,0x00,0x00},/*"j",74*/
" d, [9 f5 R5 A7 i - {0x20,0x40,0x3F,0xC0,0x01,0x40,0x07,0x00,0x04,0xC0,0x04,0x40},/*"k",75*/: x9 A( ]5 P* |5 j1 |5 N
- {0x20,0x40,0x20,0x40,0x3F,0xC0,0x00,0x40,0x00,0x40,0x00,0x00},/*"l",76*/
# Q( t" e+ g2 L+ g' y8 A5 K; o - {0x07,0xC0,0x04,0x00,0x07,0xC0,0x04,0x00,0x03,0xC0,0x00,0x00},/*"m",77*/
2 e5 k/ ]4 N6 G, Q, `5 o - {0x04,0x40,0x07,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"n",78*// H, w6 Q d8 q2 d, k1 Z/ w
- {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"o",79*/5 ^& Q) E- v; Z+ j1 z- |3 c, n
- {0x04,0x10,0x07,0xF0,0x04,0x50,0x04,0x40,0x03,0x80,0x00,0x00},/*"p",80*/
8 j5 d6 | S3 u; w; v* N - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x50,0x07,0xF0,0x00,0x10},/*"q",81*/
8 G6 }6 V' K) ?% s( y - {0x04,0x40,0x07,0xC0,0x02,0x40,0x04,0x00,0x04,0x00,0x00,0x00},/*"r",82*/
( W6 x2 h) F+ |7 W m* l8 C - {0x00,0x00,0x06,0x40,0x05,0x40,0x05,0x40,0x04,0xC0,0x00,0x00},/*"s",83*/
: t# K7 y& @# s1 W0 z0 Q) ` - {0x00,0x00,0x04,0x00,0x1F,0x80,0x04,0x40,0x00,0x40,0x00,0x00},/*"t",84*/
# B$ V# R1 `0 O6 s! q, p - {0x04,0x00,0x07,0x80,0x00,0x40,0x04,0x40,0x07,0xC0,0x00,0x40},/*"u",85*/
) w0 e, i9 E" m( C - {0x04,0x00,0x07,0x00,0x04,0xC0,0x01,0x80,0x06,0x00,0x04,0x00},/*"v",86*/
* Y: P# b8 G1 ~( { - {0x06,0x00,0x01,0xC0,0x07,0x00,0x01,0xC0,0x06,0x00,0x00,0x00},/*"w",87*/" v& I, K- o& z" u2 ]/ k
- {0x04,0x40,0x06,0xC0,0x01,0x00,0x06,0xC0,0x04,0x40,0x00,0x00},/*"x",88*/
9 a4 P! x: x G - {0x04,0x10,0x07,0x10,0x04,0xE0,0x01,0x80,0x06,0x00,0x04,0x00},/*"y",89*/
% H1 Q# Q3 m. m# U4 k - {0x00,0x00,0x04,0x40,0x05,0xC0,0x06,0x40,0x04,0x40,0x00,0x00},/*"z",90*/
( H k& {9 t$ C/ i3 S1 \ - {0x00,0x00,0x00,0x00,0x04,0x00,0x7B,0xE0,0x40,0x20,0x00,0x00},/*"{",91*/9 a$ r% j+ O2 c; e+ V: }
- {0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF0,0x00,0x00,0x00,0x00},/*"|",92*/
S+ u! w6 f1 K7 d - {0x00,0x00,0x40,0x20,0x7B,0xE0,0x04,0x00,0x00,0x00,0x00,0x00},/*"}",93*/, j, e) R- O# f5 V9 c
- {0x40,0x00,0x80,0x00,0x40,0x00,0x20,0x00,0x20,0x00,0x40,0x00},/*"~",94*/
8 `7 B) G: A* J% j - }; ) B4 X2 u M) w, ~: S
复制代码 $ I$ r9 U. U; G: O. L0 k8 z2 B
5.SSD1306基本命令& M5 t! b0 V+ z$ f* M
上面介绍了显存,我们已经知道OLED的图像显示原理了。然鹅,在显示图像之前,还要对SSD1306做一系列的初始化操作,这就用到一些相关指令了。
- }/ Z' {1 d& Z( P6 d( j2 H* d* U4 z9 S; {
3 O% j' z6 b9 M9 }
暂停一下!!!捋一下命令与数据的关系:; Q# ~# b7 Q- a7 S* U& _6 @
上面介绍过D/C线,D/C低电平代表传输命令,高电平代表传输数据。数据就是显存GRAM的内容,而命令就是下面要介绍的。所以OLED与单片机通信就是由单片机向OLED写入信息,开始写入命令来初始化,之后写入GRAM(图像的信息)即可!
# z% K& u. C6 z7 J' i/ S* n7 |3 M/ y. X! |6 c$ W: e
1 h0 V( {; u$ X! I+ Z
一些常用的命令如图所示:4 w" E) _6 ~ E l; C/ a
6 X) H4 X+ ]1 k0 H+ y1 ]! U; H8 R* P1 _! x; j3 M' s5 R8 d( M
1 F3 m$ Y# q/ F) T- J; d
" V ~1 ]6 C4 n2 k
% r7 f- p1 v' R比较重要的是设置起始坐标的三个命令; u3 _! Q" v( G9 w; t
命令为 0XB0~B7,该命令用于设置页地址,其低三位的值对应着 GRAM 的页地址。
. X$ V7 P; o' ?- P( r3 @" G5 F1 n) i- q命令为 0X00~0X0F,该指令用于设置显示时的起始列地址低四位。) ? [ z6 I3 u, J% b. b3 j/ U
命令为 0X10~0X1F,该指令用于设置显示时的起始列地址高四位。
: J' _6 m& V+ M: F7 G; P1 r
; N: u) B* D/ |9 f; `8 L4 O
% |( G. p" }7 t9 x- I& ^2 ]有关初始化OLED的所有命令会在下午代码讲解部分列出!
1 l" `# a7 Q0 x) l% L3 q3 P$ ~+ V9 w$ ?# [0 p, c, e
$ _2 _0 c7 M( ?( G# Z9 z
三.代码讲解
. Z" J* k: O- `# u3 t5 s1.相关引脚配置" H, x+ P2 M$ o# `
上面介绍了相应的引脚,这里对相应引脚进行配置,注意:除了GND和VCC引脚,其余所有引脚的模式均为推挽输出,代码如下:8 U2 }2 M6 S& l* M6 M' {
- /* 8 u6 r: ~3 T2 u1 k
- 配置4线SPI模式的所有引脚
: z" [% R' G: o$ _# S( _ - 4线SPI模式只能写,不能读
; k4 d2 u8 ^/ _2 c2 v - SCLK:PC0 D0 + K- q/ C, `) t8 F) P7 R. B5 f
- SDIN:PC1 D1: s# O# {: }3 j7 h. I# r4 D- K, W5 z
- RES :PG15 拉低时初始化(复位),正常时拉高
3 D. Y2 k* h8 d+ o& P% o! @- h - DC :PD3 (0:命令 1:数据)
& s: ?1 P( v ?7 ~ - CS :PD6
6 R o2 J3 Q9 ] g& H- v* F - */8 N x' ~4 H- \/ Y' A
- void OLED_GPIO_Config( void )
/ S5 V) N: u1 H# [ - {
( N3 z' @5 q9 Q. F2 o' d$ J4 q - GPIO_InitTypeDef GPIO_InitStruct;
1 o6 t, X! F' h1 j) }# s: z - ! J1 D9 ^$ F7 J
- RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOG, ENABLE );
# y; g5 U! y6 X* m -
( P% s4 N) {/ \0 }# }/ T* k - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;' b# c$ f; |% x9 E# _
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
7 l" v. c! ?( ^& J - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;6 l+ \7 W! l9 \$ j) o z
- GPIO_Init( GPIOC, &GPIO_InitStruct );9 _7 U$ \0 h5 h* p0 o. Y
- , o0 L' K/ t' W4 T
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
& y h4 B. m1 L: g, E2 b6 g - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_6;
+ r1 C2 m/ S" @# Q2 z - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
. \& N) W$ H+ z% @# A - GPIO_Init( GPIOD, &GPIO_InitStruct );
# y! v: M5 _0 _0 B# f8 M1 Q
$ q! o* z* x& [3 L& L- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;0 y% o( S0 _, e N, f
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15; h% b" D/ K; R5 P4 U
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;; W8 H9 Q9 w2 P# p L
- GPIO_Init( GPIOG, &GPIO_InitStruct );$ ~1 l5 T" G7 n' Z
- }
- R# ?6 G! N6 i$ p
复制代码
' C: \# |9 v2 ^3 s& H) J+ C由通信时序知,通信的过程中需要不断改变引脚的电平,所以我写了一些对引脚电平操作的函数(格式都一样):) ]" V Y; P( ?6 t- d ~
- void OLED_SCLK( uint8_t x )# H1 q+ Y; R0 p& T: p7 a2 B2 V
- {' f; e# E4 C/ [$ |& X+ _
- if( x==1 )
' x, s L+ H& R! ], V - GPIO_SetBits( GPIOC, GPIO_Pin_0 );0 s# i' E' M: t# m
- else! V( q! u# Z5 U4 S8 \
- GPIO_ResetBits( GPIOC, GPIO_Pin_0 );
# |. I$ B+ K+ a* E! E - }7 P$ U) l1 Z% h- |5 k5 Y
9 u! y, |/ `. |- void OLED_SDIN( uint8_t x )
3 T; }1 Y- i- B - {( }8 r* c7 d, m7 x
- if( x==0 )
4 H0 A/ G% L) k( v - GPIO_ResetBits( GPIOC, GPIO_Pin_1 );
; K, T8 O! O+ {) e3 p0 j) {: s - else
^) [) D/ h& l( k - GPIO_SetBits( GPIOC, GPIO_Pin_1 );
8 z% F$ g0 N8 J8 ^ - }
, O, o; i. ~) Y! q5 Z
Y/ b' l; c) a2 O+ b+ s& G; t4 ^- void OLED_RES( uint8_t x )9 ?, c( U) D' U. ?% X" b& j
- {: I ?3 Z, k$ R7 Q
- if( x==1 )
+ k' A- O6 s6 z- G: O0 h- q6 M& U; Q - GPIO_SetBits( GPIOG, GPIO_Pin_15 ); f8 U; v" C+ {3 j+ ?- G
- else
4 O* E3 j* r$ ?* j - GPIO_ResetBits( GPIOG, GPIO_Pin_15 );
, E: t5 \) a( ]( M - }3 G) l: g/ p3 o n* m' W4 D
+ X- G g$ Z2 R1 R- void OLED_DC( uint8_t x )
; v& P8 n7 L) s8 ~" B; e( T5 { - {
# B; u# J# z- Q! C/ e+ l1 |/ N - if( x==1 )6 R% @ T0 h" W4 p
- GPIO_SetBits( GPIOD, GPIO_Pin_3 );! Z9 @( Q( Z# I
- else
9 a7 z, @! `7 ?" Z! G4 Y+ A1 l, ? - GPIO_ResetBits( GPIOD, GPIO_Pin_3 );
# o( V6 y3 L/ o2 |& s) D2 s' {- | - }, Z H1 r7 A& r. q* A. Y
( B2 E( z: F; Q$ H ?, ?9 \/ B- void OLED_CS( uint8_t x )
2 U# [ N+ p( b V' R% i" R - {! D P: o# ?3 I$ T2 A
- if( x==1 )
+ v4 w) J9 O g - GPIO_SetBits( GPIOD, GPIO_Pin_6 );
! ~2 o# S6 \2 A9 ^( [ - else
6 h6 {# p; ^. w8 G2 ]* c8 B - GPIO_ResetBits( GPIOD, GPIO_Pin_6 );
( z) u K, y$ e2 i9 ]" u - }6 N9 T0 t7 Q/ u/ v: a+ ^6 G
复制代码 2 _. E# _) `' {2 `6 k$ d, }
2.模拟SPI通信1 L- Z* p+ }2 X l+ ]
我根据时序图模拟了SPI的通信协议,按照时序图对相应的引脚操作即可,一共写了俩个函数:写数据和写命令。函数如示:
+ J/ y/ }6 a! q) L5 ~7 s# d- 5 C' G1 b8 d6 j
- /* 写一个命令 高位先行 */
4 l) Q9 a# ~: Y# |8 a! n1 ?! u - void OLED_WR_Cmd( uint8_t cmd )( [- ]( Q! U2 e' y+ a* J
- {: p% G0 A: U3 C3 s/ {1 g1 Q$ Q
- uint8_t i,k;
; J3 d) k4 f( @, Q! k2 A: h - /* 拉低片选CS,写命令拉低DC */" n8 L9 s& u: S- b6 h- E( Q
- OLED_CS(0);
8 d/ {8 `# U7 T# g" R - OLED_DC(0);8 e) L* A% h- W! M4 N* H
- . n2 U+ q. F2 Y. V3 J
- for( i=0;i<8;i++ )
$ r* p+ ~0 u3 ~ - {) i6 V9 O/ z5 s, v. h3 c
- /* 时钟线,上升沿有效 */3 i: W9 `3 Z; k/ _' F5 C/ ^9 o' k
- OLED_SCLK(0);; F$ P+ A+ v! C. j; d
- k=cmd&(0x80);
' q1 O& T- z4 j C% Q - OLED_SDIN(k);8 H; P6 g- w9 r* P/ M
- OLED_SCLK(1);
$ [6 K& C& c1 {" F# n+ r - cmd<<=1;. e x8 C; \/ X7 X) w8 K6 z
- }
: b x" n8 v% J7 Q8 {4 R J - OLED_CS(1);
5 e2 f# B( \! ~( J3 F- ? - OLED_DC(1);
1 p2 d! d$ ]- b* z/ b$ z1 Z - }
+ C8 o7 w: L6 k5 X' G - 5 x7 X$ G o% k( \7 B
- 1 N2 g5 V) T: ]" [
- /* 写一个数据 高位先行 */
, W- }3 ?0 d# i, D; x j - void OLED_WR_Data( uint8_t data )& O0 |+ M1 ]6 `* F5 S
- {
# V& X) P/ g% d7 {5 U/ N6 d - uint8_t i,k;
c j( |% N& p; f. G1 t - /* 拉低片选CS,写数据拉高DC */) u$ Y. C! a5 w# J
- OLED_CS(0);
7 G5 A% F( M3 f2 Z( e: S - OLED_DC(1);
: a. K' ~# M. }$ h5 q# r -
v3 C4 ^( l6 r2 c4 C) F: ]) U - for( i=0;i<8;i++ )
3 x( J5 X# s ]* R0 O - {
4 ]. Q9 F9 i) M8 `0 L - /* 时钟线,上升沿有效 */8 }; i. H8 F! ?# ^% u" t( b3 d
- OLED_SCLK(0);
2 H& m% Q; t6 T2 w: f, R7 I7 R - k=data&(0x80);7 w7 R2 j$ {! a& s
- OLED_SDIN(k); w1 j" R( u) ]6 y/ I
- OLED_SCLK(1);
; R# I6 z2 L8 f8 p& G: O& I0 Z2 @ - data<<=1;
) w- R" D) q" l! ?4 s# y - }6 _9 m% q4 ]5 G
- OLED_CS(1);
6 _+ c. D8 P# x - OLED_DC(1);! G- q4 f+ f5 O5 X
- }% d6 V! {8 I% B$ k+ ~% z* [
复制代码 $ _4 N! C5 }! |0 l4 n$ W
要注意:无论数据还是命令的传输,都是高位先行,这是根据时序图知道的。 s: a8 J0 }& q3 W
, L5 b9 H: p1 k* s( v& B5 M8 {0 S3.OLED初始化函数/ m$ N$ _7 g" e* S
前面说了,会有一堆初始化命令:
; L, x4 U. s* ?! ~
3 S0 r* G6 ^+ _- /* OLED初始化函数 */
8 s8 o0 k' z# p - void OLED_Init( void )0 i$ d$ U$ e+ \1 w
- {9 O9 D5 q! C) U: n0 ? b R
- /* 引脚初始化 */
* r1 X8 ], p+ j7 z" k; P - OLED_GPIO_Config();9 q `' N: j4 u" ?) i
- ) t; ^" u( Z% r- O C6 w& q4 O9 V
- OLED_CS(1);" Z% z2 X) ~4 b* w! _
- OLED_DC(1);# T" T& P/ o) R: g9 J
-
4 l( I; R" Z. M& x - /* 复位 */
; u1 x5 y0 C+ ?0 e - OLED_RES(0);
7 d, L6 I5 A* a8 n/ ~ - Delay_ms(1000);
! |1 ]5 c: n1 O9 q - OLED_RES(1);. a2 E) l j& f, y( l7 v- ~5 b0 y
- % U! x- x4 ?" _. k: W4 I1 E, [, c
- /* 开始写入初始化命令 */" {1 Q6 U! i8 @2 j l3 z( Q
- OLED_WR_Cmd(0xAE);//关闭显示
' j1 S1 g1 Y; N8 J' a - OLED_WR_Cmd(0xD5);//设置时钟分频因子
- G$ l; M3 g F7 x7 }$ r - OLED_WR_Cmd(80);
9 P' S0 p5 g8 i8 t; z" L1 v; f% \3 J - / R. `/ S$ p/ n4 X1 k5 S" n
- OLED_WR_Cmd(0xA8);//设置驱动路数
( D% n1 z: F, \. [ - OLED_WR_Cmd(0x3F);//路数默认0x3F(1/64)
0 A- h' D4 {. a5 G3 U+ R - % a7 ]' c. T M8 s
- OLED_WR_Cmd(0xD3);//设置显示偏移, H% \2 ?0 G, T6 \) S" P9 H8 u
- OLED_WR_Cmd(0x00);//偏移默认为0
5 B8 H3 x2 A. o6 q! j$ C" S6 W - , `/ f" i0 n* _* h- H# b: d- F
- OLED_WR_Cmd(0x40);//设置显示开始行[5:0]/ x6 m! a( w/ C( e
- 7 e Z+ ^6 Z# |5 U5 n, ~
- OLED_WR_Cmd(0x8D);//电荷泵设置
1 ]5 C! ~' w% w* j& A - OLED_WR_Cmd(0x14);//bit2,开启/关闭9 n/ {! C8 A0 E
-
9 L9 S9 r/ g$ T& Z$ [. ^2 Y: o - OLED_WR_Cmd(0x20);//设置内存地址模式
2 l$ J' b# A8 e h% s4 [ - OLED_WR_Cmd(0x02);//[1:0],00,列地址模式;01,行地址模式;10,页地址模式;默认10; w1 W" R" W* m# X* D
-
1 E! R* A- o; v+ g* [/ k; n - OLED_WR_Cmd(0xA1);//段重定义设置,bit0:0,0->0;1,0->127;$ r9 k' ?; q- _; }
- OLED_WR_Cmd(0xC0);//设置COM扫描方向;bit3:0,普通模式;1,重定义模式 COM[N-1]->COM0;N:驱动路数
4 X6 W" u$ G2 [% k: [/ D3 S \6 k - OLED_WR_Cmd(0xDA);//设置COM硬件引脚配置% S2 L: w4 E1 m. H( _9 o$ Q* S
- OLED_WR_Cmd(0x12);//[5:4]配置9 |3 W+ @( }( n% u; B/ j* \
-
! X/ ~/ {5 y' x; D+ V; G3 D8 P - OLED_WR_Cmd(0x81);//对比度设置% j5 \" z* w7 T7 {+ z/ ?/ d3 X
- OLED_WR_Cmd(0xEF);//默认0x7F(范围1~255,越大越亮)0 v2 ^5 T6 b' v1 l
- 0 Z) q3 q3 s i# m* J# y/ p- g
- OLED_WR_Cmd(0xD9);//设置预充电周期
+ P# k7 ?, b8 @1 ] - OLED_WR_Cmd(0xF1);//[3:0],PHASE 1;[7:4],PHASE 2; H4 A' V5 k, T* p1 r
- : p0 G5 m& R+ W6 y
- OLED_WR_Cmd(0xDB);//设置VCOMH 电压倍率+ H6 V2 Q2 T4 h, n* V) B
- OLED_WR_Cmd(0x30);//[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;# q) ]) G3 ~; k) k( n# D+ K
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- OLED_WR_Cmd(0xA4);//全局显示开启;bit0:1,开启;0,关闭;(白屏/黑屏)% r" s: Y3 J }; T3 w8 t! s
- OLED_WR_Cmd(0xA6);//设置显示方式;bit0:1,反相显示;0,正常显示
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( W0 u7 t7 s, h2 k6 M - OLED_WR_Cmd(0xAF);//开启显示+ L, X9 G9 P2 F5 F
- # m) I" N6 G" ?& i' m+ Z- [
- /* 清屏函数 */; n; d+ V4 u5 z0 s k6 h1 p
- OLED_Clear();' w/ {$ P8 ?7 y1 Q. w) e
- }
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啥也不说了,照着写就完事了!
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4.图像刷新与清屏函数
% S8 f4 c1 G1 u2 G8 j5 u假设图像的信息都已经写到GRAM中了,那么就可以通过图像刷新函数,将GRAM中的图像画到OLED屏幕中,刷新函数如示:
, ?: S. K/ `# U- A" c: a9 D. F% t5 \- /* 图像刷新函数 */
' L* p) h0 T) m2 o* E3 y+ ], k - void OLED_Refresh_GRAM( void )
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) M9 S7 N; D; D5 h0 w/ o( E - uint8_t i,j;
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- /* 设置显示的起始地址 */
/ z. M$ [' ^# x" i; s - OLED_WR_Cmd(0xB0+i);//设置页地址(行)
* u6 B6 z# Y, u3 b( e& E L - OLED_WR_Cmd(0x00);//设置列地址的低四位
x: i. `# t( h0 z6 J c - OLED_WR_Cmd(0x10);//设置列地址的高四位
3 C$ V+ b9 w) r% t - for( j=0;j<128;j++ )$ C- T! {- M- O$ P
- {
; k1 a5 h( M8 e8 ^8 N; p - OLED_WR_Data(OLED_GRAM[j][i]);//将GRAM中图像信息写入屏幕' a) B9 v) C3 a: t9 G
- }
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对应的,清屏函数就是将GRAM中图像的信息抹去,然后刷新一下:0 h$ e* T, i; L( {% w7 O
- * 清屏函数 */& y* {0 R7 v. J+ c0 [: f& i
- void OLED_Clear( void )3 a* s3 Z% X6 J8 f, _! ?7 n% b. s
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- uint8_t i,j;
# w% A- i6 l" [* N9 v - for( i=0;i<8;i++ )
# b# D/ x3 g m. b - for( j=0;j<128;j++ )
" y" {! j" k) `" g - OLED_GRAM[j][i]=0x00;1 P( V9 q' u; p" k6 e( M, P
- OLED_Refresh_GRAM();. q4 S n2 e( r" G3 v
- }
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' F, }1 h0 z% H4 p5.画点函数6 c+ I( T d$ k$ U- W3 C8 C( u
所谓画点,就是将屏幕中指定位置的像素点点亮。在GRAM中就相当于把相对应的位置一,难点在于根据屏幕上的坐标推算出GRAM中的位置,函数如下:
4 D8 o: b) Y: [! a, b* L- //OLED_GRAM[128][8]* m N U0 C. {
- /* 画点函数,以屏幕像素点为单位,以左上角为原点 x:0~127 y:0~63
) A3 b8 x# V" U1 A& o - (x,y)坐标换算:OLED_GRAM[x][7-y/8]|=1<<(7-y%8);: W* R+ f- m# F5 [
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- mode取1正显,取0反显6 S" P9 U/ G6 c( N5 c7 s
- */; b$ ]! I/ S& d0 }& r# T4 V
- void OLED_DrawPoint( uint8_t x,uint8_t y,uint8_t mode )9 I$ b$ S6 L7 ~
- {
6 ]/ u& E" _5 U% b4 w7 o1 e$ t - /* 主要是求出y坐标,根据y坐标来位运算OLED_GRAM中相应的位 */
8 K9 E7 X; L" m - uint8_t i,j,temp;
/ p2 Y6 d. g7 c - /* 判断坐标是否超出范围 */; K. R6 v2 c w- h2 Q f
- if(x>127||y>63)return;
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- i=7-y/8;//算出第几页
: a9 x1 j% M6 g% ] - j=y%8;
& ^/ u* @! i$ M& ^" t - temp=0x01<<(7-j);//由位运算精确找出坐标像素点5 V- q9 l' n# }+ ?$ W) l
- if(mode==0)+ T$ p% Y2 x3 i
- OLED_GRAM[x][i]&=~temp;5 L& k6 P# O% \1 E% [7 e7 f
- else
# o5 D3 R- c3 P7 C9 P - OLED_GRAM[x][i]|=temp;& m/ x5 W h1 ?" u8 W2 l" ^
- }
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6.显示字符函数/ R0 J2 L% G$ _0 s/ Q0 p, F: p
在某一坐标显示指定大小的字符,而且是从字库中提取字符图像信息,这就是显示字符函数:
( F2 D; _: ?. Z; }7 H5 h- /* 在(x,y)坐标正显/反显指定大小字符chr# I0 t; k- E, A/ N& @
- mode:0是反显,1是正常显示7 l( J+ \8 d9 K6 ?! U
- size:12/16/24' t+ Q% G+ d# u6 P3 y5 C5 R! S- x7 C
- ASCII字符集: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
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- void OLED_Show_Char( uint8_t x,uint8_t y,uint8_t chr,uint8_t size,uint8_t mode )
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& V! g8 @ l: a$ l/ Z& j0 r7 r - /* temp是当前对应的一个字节的点集,y0是初始坐标 */
9 b- s: {* A: N9 u - uint8_t temp,t,t1;; h! a! w6 K+ }* n! t- W# g4 q
- uint8_t y0=y;, [7 a1 `3 b( k2 z) Y9 L- h
- /* csize是单个字符所占字节的多少 */
4 ^9 A' R% @3 M0 v - uint8_t csize=(size/8+((size%8)?1:0))*(size/2);4 k+ k+ s4 {( P' n6 @
- /* 求出偏移的地址差,即得到该字符在字库中的序号(从零开始) */8 ^5 ]' a1 d% q, h* C S
- /* chr会锁定字符在字库中的的序号 */
, z$ N8 {0 _4 ?* S- P" K1 N( w - chr=chr-' ';0 K# H! E N" a% A; b
-
* v: e( i. D$ W% ~% x5 E$ |" s - /* 相应字符点集有多少个字节 */
& T8 Y4 s( F1 ~3 L( R# Y - for( t=0;t<csize;t++ )
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- /* 根据字符的大小选择相应字库,根据chr得到具体的字符地址 */6 m- v+ G# G7 e; E
- switch( size ), f2 I" f9 Z- o% T. \$ r
- {
# E$ c# |: @" g( a- F - case 12:temp=asc2_1206[chr][t];break;//12x6(行x列)
3 I1 d' }. e# @0 o - case 16:temp=asc2_1608[chr][t];break;//16x80 k: U6 K: S) A5 W9 |, r
- case 24:temp=asc2_2412[chr][t];break;//24x12
) P' M8 w9 [% k* @ - default:return;//没有相应字库8 P0 M# I$ j* V) f- N
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- & C; A1 i$ D% b2 U n' y
- /* 画出每一列的点 */
: q) Y. S. [8 i3 o$ K/ s7 n c - for( t1=0;t1<8;t1++ )
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" w6 z, k3 \( Q. C( P- }3 y' s( r( V - if( temp&0x80 )# @9 d; x% H3 k
- OLED_DrawPoint( x,y,mode );: P8 V7 j/ {, z8 n! ?9 [/ U t9 g$ z. u
- else
- s4 H1 z: P( V' S% d4 u# I( D - OLED_DrawPoint( x,y,!mode );# r6 C/ ? p" j- l& S
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- temp<<=1;8 `! F- Y) U4 L# T/ S. D/ ]& ^
- y++;
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- /* 根据给出每一列的像素点的多少,判断列是否满:
6 L' T7 |; Q% r/ v+ d! t/ A - 满了就换列,不满继续在此列画点 (与字库画点原理相关)
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- if( ( y-y0 )==size )* W$ ^$ {) l _; X- X2 s
- {
- D( `6 S9 ?: j% \$ s- K - y=y0;
8 s, b( O6 ~' N/ b8 ] - x++;
: J8 J7 v( d, n4 t - /* 一列满,跳出循环,直接转到下一个字节点集的打印 */+ ^' x6 S1 h M& R' H
- break;
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- V* Q/ p$ {* |8 r7.显示字符串函数$ H1 z- ~" v3 F4 n$ ]' l x
显示字符串,就是显示字符的加强版:
" r" l3 Y. j8 T. z- /* (x,y)是显示的坐标,*p是字符串的首地址,size是字符点集大小 */, `. E/ t& w/ X) p' ?+ c) N; b
- void OLED_Show_String( uint8_t x, uint8_t y, const uint8_t *p, uint8_t size, uint8_t mode ). f2 r) a, ?3 [8 ]" o' P1 l
- {
r- Z6 _& c* O% ]. M - /* 判断是否合法字符,同时也限定了范围 *// T3 f2 Z! ]* c8 {2 n8 o
- while( (*p<='~')&&(*p>=' ') )5 w6 p/ j% ?$ g$ c. X( |9 \
- {8 u2 V4 k% N2 V, s, y
- /* 如果初始行放不下,移动到下一行 */' U- {8 R9 `, G' {" g- m
- if( x>(128-(size/2)) )
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5 p! d7 A% C( ^) V* B9 \ - x=0;2 H3 H8 M% p$ a/ w
- y=y+size;
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6 K" C! |7 F( c+ X& I - if( y>(64-size) )
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- x=y=0;
& ]. q; ]8 s5 X$ | - OLED_Clear();5 w7 a8 j: v% a/ B" Z# _! O$ Z# l
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- OLED_Show_Char( x,y,*p,size,mode );
6 U3 i; i" f' W, x - /* 移动到下一个字符位置,size/2是因为做点集时就是:行X列,而且 行=2X列,所以size就是行数 */
3 `* t/ g# ~- S0 `, }2 U - x=x+size/2;; q* q1 `; O0 P2 v9 }4 y' ~7 \: m
- p++;
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8.显示特殊图像
3 t$ Q/ m5 n: F" F1 @+ [' b显示特殊图像的方法和显示ASCII字符一样,只需要知道特殊图像的点阵信息即可,这个可以使用取模软件自己画点,再适当修改显示函数即可,学会了可以做一些特殊图像,包括汉字。当然,汉字也有字库,就是太大了,加上使用英文完全可以表达,所以只把需要显示的汉字做出来就行。当然,用来表白也是不错的!
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