一.OLED简介
; Q. O6 }7 a3 Z' u: j1 g! qOLED,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。
. x/ f& w Q0 H2 P3 V模块特点:
/ ?& N. I( l7 Q0 e没有背光,需要通过写入指令来开启显示$ X# e. c" w! h0 m! d# {4 X5 X4 X
尺寸小:0.96寸,分辨率高:128*64* r. D" w; M# s ^5 ~7 c/ i
提供多种通信接口:6800、8080、3线/4线SPI、IIC
7 m2 H' S2 v/ f供电3.3V' i, \+ d+ A/ O, l
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0 ], ^; L6 Z. C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: L; r# Q% l& D: U7 m k) ~& o
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我是使用4线SPI驱动OLED的。, q' E- `% y& c; ~) R# m* W
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3 }- F+ b. [: @6 R7 @+ \. |5 V二.驱动SSD1306所需知识- X7 f# m/ _( |# W% D
1.引脚介绍 K& D4 l' G. G0 d( B
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4 q B5 [/ Z/ z2 [6 s如图所示,各引脚的介绍如下:
( l8 y* Y# f5 UGND:接地引脚
7 }9 x9 o$ e2 A7 D$ Z/ o- UVCC:接电源引脚,接3.3V直流电源即可
5 f1 o! U$ _, y: e$ I! _: jD0:SPI的时钟线SCLK
# Z) l$ a! ^5 T& n& BD1:SPI的数据线SDIN, t0 }8 [: n6 R; [7 O7 t, ^
RES:复位接口,低电平初始化(复位),正常时高电平
8 F0 D$ z: g/ {) QDC:用来选择命令or数据,低电平命令,高电平数据4 R! x; ~1 ~8 A* C6 b. g y* g
CS:片选线7 n: w% f/ t- m5 [ V
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注意:4线SPI模式时,只能写,不能读!
}/ R+ t* B' }7 J在本文的代码中,对应的接口如下:4 n, `" z" _; i$ a a. S. M
SCLKC0 D0
7 ]: o) d% a3 N6 c! l2 Y( C- kSDINC1 D1
; u* k0 u6 t4 E7 u* \# D4 aRES G15 拉低时初始化(复位),正常时拉高7 i4 a* F# U) k. ~0 g( X
DC D3 (0:命令 1:数据)8 q) [. R, B6 Z- J. {2 n
CS D6' h6 {+ W, a( k/ O/ [0 H" V8 {
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3 s& s( e5 [; b1 R2.通信时序
7 s7 V# E f$ i. L, e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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由图知,SSD1306与单片机通信可以分为如下几步:6 Z# J% l w" P
1.拉低片选CS,作为正常通信的前提8 m1 a' [- L) ?, ]6 K0 I& \) ~8 w$ w! ?* ~
2.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
9 \% _ m! E/ D- v. `2 a, N3.时钟线SCLK不断产生时钟信号,上升沿数据线有效
3 W8 c0 c9 b2 d: z& i' y; P) `4.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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2 V3 F( @- ^, i, Y% I' ?: P3.显存GRAM. L+ g& l" R, c2 T
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。
1 y2 Y! j2 K# L: @* XSSD1306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。
6 |9 m+ ~+ y7 ?1 }" LSSD1306的GRAM与屏幕上像素点的对应关系表如示:4 [- W4 N5 E, I% x* u5 U5 g( v% o
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- m" _1 B R: b' t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!! w& l( i1 u$ U( q0 y- J
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:' M. }- Z; K( L( m: y9 D
- /* OLED的显存 */# P7 O( S0 ^6 W2 ]# J. |: k
- uint8_t OLED_GRAM[128][8];- s7 l, l2 K4 c. T4 q$ \; K
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- OLED_GRAM[128][8]中是8位二进制为一个单位) W; m. e5 l% m, I' \
- 其逻辑排序如示:(高位先行)/ M+ v0 e# L# ] T) m
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复制代码 / U* S8 W+ e9 S" P
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。3 r' S$ {- j% H9 O" n& ^! I
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0 y S# ]( b' n! x. \4.字库5 j( d( t" |# u. R) S5 X
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。
( x) a8 l6 j1 }! V3 G% w! N9 f. b% h本项目所使用的字库大小有(高x宽):12x6、16x8、24x12* \ p( F2 q6 |- F0 z* h
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)2 ^/ s0 G/ y: |; R
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
. l. m& K* @3 w0 H/ A% k8 G, g比如12x6字库信息如示:4 N/ e& @9 h. v
- //12*6 ASCII字符集点阵4 F8 l0 p, t& ]- r& A. T
- const unsigned char asc2_1206[95][12]={: @( w/ r) d2 R5 c0 e7 p. p; k, E
- {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/- @# ^! ?# d0 R8 ?0 D8 q4 f
- {0x00,0x00,0x00,0x00,0x3F,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*"!",1*/4 Y; j( R7 i/ Q/ G0 q+ C
- {0x00,0x00,0x30,0x00,0x40,0x00,0x30,0x00,0x40,0x00,0x00,0x00},/*""",2*/+ \7 H4 J" M. r+ D! X U
- {0x09,0x00,0x0B,0xC0,0x3D,0x00,0x0B,0xC0,0x3D,0x00,0x09,0x00},/*"#",3*/
) ^* c& W+ ]3 C5 x: x: H - {0x18,0xC0,0x24,0x40,0x7F,0xE0,0x22,0x40,0x31,0x80,0x00,0x00},/*"$",4*/
# {7 Z) A; b9 q - {0x18,0x00,0x24,0xC0,0x1B,0x00,0x0D,0x80,0x32,0x40,0x01,0x80},/*"%",5*/1 {, i5 g4 z' e% j( L# a1 P
- {0x03,0x80,0x1C,0x40,0x27,0x40,0x1C,0x80,0x07,0x40,0x00,0x40},/*"&",6*/
' V: e7 d+ C/ K3 Y, Q4 n/ ~ - {0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/: V, ?# v% K& P, ?
- {0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x80,0x20,0x40,0x40,0x20},/*"(",8*/
, d7 W; F! B, S s# i& N5 U* [2 h: r - {0x00,0x00,0x40,0x20,0x20,0x40,0x1F,0x80,0x00,0x00,0x00,0x00},/*")",9*/
! n o# Z c( F% d - {0x09,0x00,0x06,0x00,0x1F,0x80,0x06,0x00,0x09,0x00,0x00,0x00},/*"*",10*/' C, c, Y/ ]2 `& o6 l* u
- {0x04,0x00,0x04,0x00,0x3F,0x80,0x04,0x00,0x04,0x00,0x00,0x00},/*"+",11*/( ^) c: o) p! D) Y
- {0x00,0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*",",12*/
' n* |% z4 \* @* F5 \: z$ Z - {0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x00,0x00},/*"-",13*/
! \6 a; `. J, l# d P. L+ r& h, ^ - {0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*".",14*/# B: L2 c/ e8 N5 x$ a# ]' T' M+ e
- {0x00,0x20,0x01,0xC0,0x06,0x00,0x38,0x00,0x40,0x00,0x00,0x00},/*"/",15*/% E V$ I8 u, y8 G
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"0",16*/5 y+ n' u7 I& k# \
- {0x00,0x00,0x10,0x40,0x3F,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"1",17*/
' P' E; _. r- W: ?% i3 G+ b - {0x18,0xC0,0x21,0x40,0x22,0x40,0x24,0x40,0x18,0x40,0x00,0x00},/*"2",18*/" |* q2 M- _9 h& q! ~* C
- {0x10,0x80,0x20,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"3",19*/
+ Z5 |3 u% A) b8 U R" G; U8 i - {0x02,0x00,0x0D,0x00,0x11,0x00,0x3F,0xC0,0x01,0x40,0x00,0x00},/*"4",20*/
) n$ L Y, k q. ]" ]& l - {0x3C,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x23,0x80,0x00,0x00},/*"5",21*/
- X& F/ U! s7 w- s& [5 G6 K - {0x1F,0x80,0x24,0x40,0x24,0x40,0x34,0x40,0x03,0x80,0x00,0x00},/*"6",22*/
! t; ^- J9 V! N: E - {0x30,0x00,0x20,0x00,0x27,0xC0,0x38,0x00,0x20,0x00,0x00,0x00},/*"7",23*/
0 Y0 a Q) Q6 |0 i" X - {0x1B,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"8",24*/
4 `8 y1 ^, ^2 b - {0x1C,0x00,0x22,0xC0,0x22,0x40,0x22,0x40,0x1F,0x80,0x00,0x00},/*"9",25*/
$ G G: w! u% h7 W- h+ T - {0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*":",26*/7 O) G7 B/ l* b3 U. a+ C/ X; H; U4 d
- {0x00,0x00,0x00,0x00,0x04,0x60,0x00,0x00,0x00,0x00,0x00,0x00},/*";",27*/
, f2 ?$ ~2 o. v1 K5 w3 i) Z$ X - {0x00,0x00,0x04,0x00,0x0A,0x00,0x11,0x00,0x20,0x80,0x40,0x40},/*"<",28*/
# O) h+ |: o4 g5 m# } - {0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x00,0x00},/*"=",29*/
- n# D% G* X: X" {# g - {0x00,0x00,0x40,0x40,0x20,0x80,0x11,0x00,0x0A,0x00,0x04,0x00},/*">",30*/
% Y( v8 C" x9 ?* I! C6 e - {0x18,0x00,0x20,0x00,0x23,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"?",31*/( Z' ~7 p! Z" }& s- n! r2 L& j) ? u
- {0x1F,0x80,0x20,0x40,0x27,0x40,0x29,0x40,0x1F,0x40,0x00,0x00},/*"@",32*/& m! `" }4 `2 d: k$ P
- {0x00,0x40,0x07,0xC0,0x39,0x00,0x0F,0x00,0x01,0xC0,0x00,0x40},/*"A",33*/' t' e" [2 C t' b. l6 o) t4 E
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"B",34*/+ e. Q+ \; } v
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x30,0x80,0x00,0x00},/*"C",35*/5 ?8 o5 F2 ?5 j8 W5 F$ _3 x% b
- {0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"D",36*/1 K# w. w- {$ g( o3 ]
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x40,0x30,0xC0,0x00,0x00},/*"E",37*/
5 M% {; P1 i# m/ h* | - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x00,0x30,0x00,0x00,0x00},/*"F",38*/; f9 N1 @- O9 g" V; A$ i
- {0x0F,0x00,0x10,0x80,0x20,0x40,0x22,0x40,0x33,0x80,0x02,0x00},/*"G",39*/# ^' f; u! f, V& z+ P9 D
- {0x20,0x40,0x3F,0xC0,0x04,0x00,0x04,0x00,0x3F,0xC0,0x20,0x40},/*"H",40*/! D7 L" e$ L: s8 F" z% i4 S
- {0x20,0x40,0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x00,0x00},/*"I",41*/
4 r& d: @& {2 ?5 B/ B - {0x00,0x60,0x20,0x20,0x20,0x20,0x3F,0xC0,0x20,0x00,0x20,0x00},/*"J",42*/
& d5 b; F4 \3 l. j5 | - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x0B,0x00,0x30,0xC0,0x20,0x40},/*"K",43*/; ]) m$ |" f3 l) \' {, G- p% }
- {0x20,0x40,0x3F,0xC0,0x20,0x40,0x00,0x40,0x00,0x40,0x00,0xC0},/*"L",44*/
0 q( Y( L) K$ Q3 `# ^3 [8 a - {0x3F,0xC0,0x3C,0x00,0x03,0xC0,0x3C,0x00,0x3F,0xC0,0x00,0x00},/*"M",45*/1 H5 s" |" x& G8 P7 ~
- {0x20,0x40,0x3F,0xC0,0x0C,0x40,0x23,0x00,0x3F,0xC0,0x20,0x00},/*"N",46*/ q# [9 }5 q; W7 t( s8 q- {
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"O",47*/
E0 J1 J! I; X1 K- N* ? - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"P",48*/ { N0 F T- i1 j4 o
- {0x1F,0x80,0x21,0x40,0x21,0x40,0x20,0xE0,0x1F,0xA0,0x00,0x00},/*"Q",49*/
2 j; }+ l. F8 r6 D1 t& L - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x26,0x00,0x19,0xC0,0x00,0x40},/*"R",50*/# B! Y) M8 U: M8 E
- {0x18,0xC0,0x24,0x40,0x24,0x40,0x22,0x40,0x31,0x80,0x00,0x00},/*"S",51*/
8 U9 [7 F6 s5 w) i \" n- J8 N - {0x30,0x00,0x20,0x40,0x3F,0xC0,0x20,0x40,0x30,0x00,0x00,0x00},/*"T",52*/- h2 Q% b# L; Y" C7 @( j
- {0x20,0x00,0x3F,0x80,0x00,0x40,0x00,0x40,0x3F,0x80,0x20,0x00},/*"U",53*/9 D% `7 h1 O: B8 [" Y
- {0x20,0x00,0x3E,0x00,0x01,0xC0,0x07,0x00,0x38,0x00,0x20,0x00},/*"V",54*/7 \% I& S2 p* l$ l8 t
- {0x38,0x00,0x07,0xC0,0x3C,0x00,0x07,0xC0,0x38,0x00,0x00,0x00},/*"W",55*/
! v' F- K$ F. U# A; B3 b% ~5 u0 r - {0x20,0x40,0x39,0xC0,0x06,0x00,0x39,0xC0,0x20,0x40,0x00,0x00},/*"X",56*/% _: s3 k9 H- _- T
- {0x20,0x00,0x38,0x40,0x07,0xC0,0x38,0x40,0x20,0x00,0x00,0x00},/*"Y",57*/
& P& }: z: M/ i# ~8 p - {0x30,0x40,0x21,0xC0,0x26,0x40,0x38,0x40,0x20,0xC0,0x00,0x00},/*"Z",58*/
2 ]$ |! K3 c: f, _ - {0x00,0x00,0x00,0x00,0x7F,0xE0,0x40,0x20,0x40,0x20,0x00,0x00},/*"[",59*/
% O1 l: e1 O/ y' C - {0x00,0x00,0x70,0x00,0x0C,0x00,0x03,0x80,0x00,0x40,0x00,0x00},/*"",60*/
- g5 y3 l& o0 @0 _1 Y - {0x00,0x00,0x40,0x20,0x40,0x20,0x7F,0xE0,0x00,0x00,0x00,0x00},/*"]",61*/* e. | T: v8 t0 L" A
- {0x00,0x00,0x20,0x00,0x40,0x00,0x20,0x00,0x00,0x00,0x00,0x00},/*"^",62*/
! r7 o+ F9 |5 c - {0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10},/*"_",63*/
# ]: b ^, l! b5 @- X# X' o - {0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/
2 d2 Y7 ]/ Z9 q. N0 x9 o - {0x00,0x00,0x02,0x80,0x05,0x40,0x05,0x40,0x03,0xC0,0x00,0x40},/*"a",65*/
( x# f: U( v& h& [ - {0x20,0x00,0x3F,0xC0,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"b",66*/ Q# g) q9 j: y
- {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x06,0x40,0x00,0x00},/*"c",67*/
1 K$ M% B* S( `" D6 { - {0x00,0x00,0x03,0x80,0x04,0x40,0x24,0x40,0x3F,0xC0,0x00,0x40},/*"d",68*/
$ }) u7 ~' r6 h" J; { - {0x00,0x00,0x03,0x80,0x05,0x40,0x05,0x40,0x03,0x40,0x00,0x00},/*"e",69*/
! p2 X5 F) V9 J: q! C - {0x00,0x00,0x04,0x40,0x1F,0xC0,0x24,0x40,0x24,0x40,0x20,0x00},/*"f",70*/: _: B/ v7 y: A" {3 |0 ?$ E0 b
- {0x00,0x00,0x02,0xE0,0x05,0x50,0x05,0x50,0x06,0x50,0x04,0x20},/*"g",71*/
( j! y3 w) u3 m8 [9 c2 x - {0x20,0x40,0x3F,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"h",72*/" d" C( P* {! c* j5 g: P x
- {0x00,0x00,0x04,0x40,0x27,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"i",73*/
+ e+ R- z9 r8 A( E2 W - {0x00,0x10,0x00,0x10,0x04,0x10,0x27,0xE0,0x00,0x00,0x00,0x00},/*"j",74*/) I) o4 D$ S$ Z
- {0x20,0x40,0x3F,0xC0,0x01,0x40,0x07,0x00,0x04,0xC0,0x04,0x40},/*"k",75*/
y F c; R" O$ I' b2 D - {0x20,0x40,0x20,0x40,0x3F,0xC0,0x00,0x40,0x00,0x40,0x00,0x00},/*"l",76*/) N, V+ @% r( W# Q4 Q* L7 F
- {0x07,0xC0,0x04,0x00,0x07,0xC0,0x04,0x00,0x03,0xC0,0x00,0x00},/*"m",77*/) J1 H( D3 S/ m5 W. `. c* `, ~
- {0x04,0x40,0x07,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"n",78*/ B1 Y+ x$ {, E! K0 s4 Q/ |7 q
- {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"o",79*/4 I. ^7 b7 `, o/ z; b
- {0x04,0x10,0x07,0xF0,0x04,0x50,0x04,0x40,0x03,0x80,0x00,0x00},/*"p",80*/
. [% P. G4 a) A4 p - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x50,0x07,0xF0,0x00,0x10},/*"q",81*/6 E" ~# r, w1 A, }% A! a0 B+ h
- {0x04,0x40,0x07,0xC0,0x02,0x40,0x04,0x00,0x04,0x00,0x00,0x00},/*"r",82*/4 ^2 H' d/ E; M0 H6 `# v( W0 L5 p3 t
- {0x00,0x00,0x06,0x40,0x05,0x40,0x05,0x40,0x04,0xC0,0x00,0x00},/*"s",83*/9 n4 C' ^+ t& Y6 H
- {0x00,0x00,0x04,0x00,0x1F,0x80,0x04,0x40,0x00,0x40,0x00,0x00},/*"t",84*/ L5 D0 ]' e! s" p7 K: C1 ^
- {0x04,0x00,0x07,0x80,0x00,0x40,0x04,0x40,0x07,0xC0,0x00,0x40},/*"u",85*/# \9 [6 w6 E' J7 L# A
- {0x04,0x00,0x07,0x00,0x04,0xC0,0x01,0x80,0x06,0x00,0x04,0x00},/*"v",86*/* ?# Z; m9 ~% _4 Y
- {0x06,0x00,0x01,0xC0,0x07,0x00,0x01,0xC0,0x06,0x00,0x00,0x00},/*"w",87*/' H. p, [3 @$ V% K+ v" L
- {0x04,0x40,0x06,0xC0,0x01,0x00,0x06,0xC0,0x04,0x40,0x00,0x00},/*"x",88*/
5 Q1 L9 J/ U; K& w9 Y! \ - {0x04,0x10,0x07,0x10,0x04,0xE0,0x01,0x80,0x06,0x00,0x04,0x00},/*"y",89*/1 c" L5 R, I/ I2 j5 k) ^5 b2 U
- {0x00,0x00,0x04,0x40,0x05,0xC0,0x06,0x40,0x04,0x40,0x00,0x00},/*"z",90*/, M3 b9 d" [+ E5 r# B, P; [( Q2 T
- {0x00,0x00,0x00,0x00,0x04,0x00,0x7B,0xE0,0x40,0x20,0x00,0x00},/*"{",91*/) p. F( `# _; j8 `- N o
- {0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF0,0x00,0x00,0x00,0x00},/*"|",92*/3 B' @$ Q1 p% E! ?' u' U" w
- {0x00,0x00,0x40,0x20,0x7B,0xE0,0x04,0x00,0x00,0x00,0x00,0x00},/*"}",93*/
9 X) u' n! R/ n# r, W - {0x40,0x00,0x80,0x00,0x40,0x00,0x20,0x00,0x20,0x00,0x40,0x00},/*"~",94*/" y1 i2 d4 B) E4 q$ F) ~
- };
5 ]0 O( D: X; M: P" C1 p2 C( Q
复制代码 % p0 ?* n0 z3 H9 X, ^* g
5.SSD1306基本命令/ ?! P0 a5 V# _' F4 i9 ~2 K4 N
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。
, U$ A. z3 A m( N& i1 d: s: L! I5 V7 [: f/ c+ l% q" I
# t& R& n# R% U* i
暂停一下!!!捋一下命令与数据的关系:0 `: r |0 F- o5 h( |" e) n C0 _
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!0 I, P/ }- |- P' c8 a: w4 x0 t# E4 I
' a! K% T' K: `" m/ H& b5 j9 T' I0 ?
4 q# F/ J2 P2 M8 C一些常用的命令如图所示:
$ d- r% v A) p- U
9 V( E/ Y' o# e* v9 h/ W6 b8 p$ a. a
; h% k; Q9 H: _- c
: I. e/ f! i1 _$ _. G# p1 }7 |8 ?% [& j, }: k# G. {4 m0 ?2 u; U" G& t9 A ?
比较重要的是设置起始坐标的三个命令$ l* _ ^* F: P; z# H e8 j6 Y: `
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。
* h8 A) L/ _" M; k& m; Q, G命令为 0X00~0X0F,该指令用于设置显示时的起始列地址低四位。
4 v1 R) T$ b! Y+ N# C命令为 0X10~0X1F,该指令用于设置显示时的起始列地址高四位。, y4 T+ B7 Y, s% u
8 @! {3 y+ j9 f) I( h, R1 P
2 Y9 }9 m& K1 E6 [有关初始化OLED的所有命令会在下午代码讲解部分列出!( N6 ]! Y+ i& w1 N8 r; ^/ H
# `' b% d" ]) d! N
3 U( i6 H0 `' v% T! w三.代码讲解- [' R0 S, O& u4 s( I8 I
1.相关引脚配置
) ]( V% W0 E* J/ R1 L# |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:9 b* a/ i' L8 j. f' V
- /*
) u, C' D5 G; C7 l4 J - 配置4线SPI模式的所有引脚
" ]. Z2 d1 ^" ^$ N9 X3 x$ ` - 4线SPI模式只能写,不能读. j2 e# u7 |5 F
- SCLK:PC0 D0
6 N5 e# U5 y" G0 I! C, c' I5 J& R3 Z - SDIN:PC1 D1+ u& @1 O; \ J0 k$ q) q
- RES :PG15 拉低时初始化(复位),正常时拉高4 s o9 S. i& U% M
- DC :PD3 (0:命令 1:数据): F6 N/ j# J3 |( G H2 V# T; ?( A
- CS :PD68 @7 C0 |$ [7 b( z6 v# K' A- d8 ^# c
- */9 Z5 \) Y) C/ ^- i n( O r
- void OLED_GPIO_Config( void ). u+ U+ U% e! [+ N w
- {, X0 @8 s6 b. p
- GPIO_InitTypeDef GPIO_InitStruct;, H* A" K) J r+ b* ^/ v" J
-
V. h' b/ N% k" |/ U - RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOG, ENABLE );& e% D7 z) Z8 H- n1 w
-
8 r" n9 ?- `2 A$ h - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
s" M' z# M( R - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
: a# g% j) _# ?9 S& s* S' v% W - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;& h) q3 H, `3 B; k5 Y c
- GPIO_Init( GPIOC, &GPIO_InitStruct );
! o+ z8 \9 J' w - r8 b& h- C' S. A4 Y% a" C
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;* d/ l6 {' N/ Q( Y* Z) G) Q' B; {
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_6;5 f" f# E; a& i! b8 L
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;1 m: U# |# n5 G, [" h7 `
- GPIO_Init( GPIOD, &GPIO_InitStruct );2 a5 D/ T* w+ M/ ^. @
- 4 L/ e x) T" |+ z
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;! N' K( ~% [' g/ g
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;, H# [# y" i. {' _" X+ e1 [
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
) q: @9 u/ J- c% E2 b - GPIO_Init( GPIOG, &GPIO_InitStruct );
9 G+ V2 j7 x4 V- B - }
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复制代码 1 C0 V E9 }3 ?
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):
3 n4 U3 ~5 @1 H% _2 i1 N( p- void OLED_SCLK( uint8_t x )/ x/ N2 |1 k' _6 W
- {
/ C1 i: Y. i) x. l, ?) b - if( x==1 )+ B) P, g W0 p; P+ i* |# D
- GPIO_SetBits( GPIOC, GPIO_Pin_0 );# I: ~/ x0 v8 Q% ]! W( h0 |
- else6 d1 Z" S) L# F. j2 Y( s: `2 F
- GPIO_ResetBits( GPIOC, GPIO_Pin_0 );
0 ]% A8 S' i, o6 b2 o - }
* B1 z" X' A) i# |
/ Q0 T/ Y7 }! n( V _/ @- void OLED_SDIN( uint8_t x )
4 N% m2 Q2 e; m/ M- p2 | M - {- T' e: t: ^8 h
- if( x==0 )$ k1 ~. R [, V4 n$ g# m
- GPIO_ResetBits( GPIOC, GPIO_Pin_1 );
, v v+ g/ S' j6 c, m! `8 Z) z7 Y - else. C+ N3 K1 x0 ]/ @
- GPIO_SetBits( GPIOC, GPIO_Pin_1 );
8 N9 [5 f2 ~' }- X& m& }4 O - }" E+ S+ u3 f' x) h, v2 p% l
2 {4 o& @9 R* e* m- void OLED_RES( uint8_t x )
, u* y! \% f% y; a - {
: n% D8 X( F, X" I - if( x==1 ). J9 u6 G6 H( Z7 M; ~- m
- GPIO_SetBits( GPIOG, GPIO_Pin_15 );2 T3 r1 [; N5 q8 H/ J5 G8 V
- else8 A0 L* a! ]) d# G
- GPIO_ResetBits( GPIOG, GPIO_Pin_15 );/ c9 z# p$ S/ E' G
- }
* w1 @& p' ]; x; M3 k% A8 K! h - ! c2 y8 }$ H5 m/ O
- void OLED_DC( uint8_t x )
- Z9 Q/ v/ @) _ - {" X7 W: a" m3 Z2 L0 F* i
- if( x==1 ) H; x* B* [. \# p+ j2 h
- GPIO_SetBits( GPIOD, GPIO_Pin_3 );: U/ [ t' ?8 D1 m3 `- M3 }! Q
- else
- O& m$ N$ ~5 E- k - GPIO_ResetBits( GPIOD, GPIO_Pin_3 );
% i5 p# e# E5 r3 V# i4 c - }
, j) C; {! `1 h h+ { - % L5 s1 Q$ l m& z) z/ E$ L) A* ~. S5 B" h
- void OLED_CS( uint8_t x )
9 B* [" i- V1 G w- K- S# ~7 U7 M" W - {
) z3 h" L, D3 o2 S2 m: Y8 F# | - if( x==1 )8 u+ u% Y& `" f, p: A+ _9 ^1 R
- GPIO_SetBits( GPIOD, GPIO_Pin_6 );
9 j2 q h* c2 G9 X - else
1 u% q: s. ]* v" z- C - GPIO_ResetBits( GPIOD, GPIO_Pin_6 );
( ~" A: n/ j7 T5 B! ~) G% I: R# H - }
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复制代码
7 r: j: z- h/ C }7 m9 z i) i2.模拟SPI通信& `8 Q/ g8 I3 T& a8 r t
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:
4 T2 J S$ F+ P, Z! C
% ~# |& E- ^: H& c( ~; }! d- /* 写一个命令 高位先行 */2 O Y! Z6 V* s. {( e+ N( f% b3 s
- void OLED_WR_Cmd( uint8_t cmd )- @( q& u4 R( } }$ c- X! d
- {9 ?) D; x+ y9 I/ V# A% ^# l0 a
- uint8_t i,k;
' R8 D$ I% J4 n/ V7 ~ - /* 拉低片选CS,写命令拉低DC */
) q l8 r; o! r2 t) U: b( z - OLED_CS(0);0 i+ c+ A6 O" S' V- J
- OLED_DC(0);
8 _! d+ q6 J! C( }0 H7 f - P7 z: E, o* S0 ~% a) P. y, f
- for( i=0;i<8;i++ )/ R( d# `3 O4 m
- {
9 p/ U+ M0 p0 M, j - /* 时钟线,上升沿有效 */. k$ L0 @' |7 L; p" S
- OLED_SCLK(0);
9 d% U, n; L7 f I( a2 l% ]! ? - k=cmd&(0x80);0 D( h8 B. S) v8 D+ H+ I
- OLED_SDIN(k);$ [8 P) B9 N6 X" ]7 g) k) v0 ~$ ^1 w, F
- OLED_SCLK(1);. ~+ B) G* v. |: U k; l; Z. R
- cmd<<=1;7 m1 _9 u: W( z$ O
- }
! Q4 U" _, P4 D8 ?! ^" E5 F+ m - OLED_CS(1);
& W; |' S" a' p' f7 H - OLED_DC(1);
) a: c4 ?% y, ~( k9 Z7 t - }- i7 [0 U2 Q" y
- / g( S6 v9 n: ~' Z% ^. f: L; t
- . [( r/ H" J) s' M: c* N
- /* 写一个数据 高位先行 */
. u* i5 V. R, U/ g4 R - void OLED_WR_Data( uint8_t data )/ ^ ?. \, @( V3 {7 W, z
- {
/ z: I* O9 H" ~4 ]) } - uint8_t i,k;
* m+ M- U. [+ Z1 z - /* 拉低片选CS,写数据拉高DC */
; T# W- A ]" |; Y8 b4 N) R8 y) q6 h3 [* O - OLED_CS(0);
3 k* b, w* L3 I5 J/ ~: n - OLED_DC(1);4 c# H9 V& l) k8 `4 Q6 H
- 9 r+ L& n$ k6 |) ` d
- for( i=0;i<8;i++ )
/ q* c6 Q U; b$ I. r - {
3 \" Q1 C5 E+ c - /* 时钟线,上升沿有效 */+ l! n. ^. J7 S4 R) [! c9 e& A
- OLED_SCLK(0);
7 h. I" Y8 x' H% _1 \ S$ v7 X - k=data&(0x80);+ w. q) s; l$ P6 F$ c# d
- OLED_SDIN(k);
- c/ ?( \# q( }; I* g) ] - OLED_SCLK(1);9 s# ?" z1 x( ^1 d
- data<<=1;0 I- s, S5 Q8 O0 W% p
- }
* R. a0 c) h0 K - OLED_CS(1);' K8 \: z0 I* g0 i2 s0 I
- OLED_DC(1);* K. C# D2 L- w2 R# X
- }! Y- t" _9 F+ l# U. n. E
复制代码 & L8 [% ], _" ~+ {( _
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。- j% T7 N+ s2 m _3 @' r1 q
4 B3 ^) Z* L" i' @
3.OLED初始化函数
0 W7 O0 f3 C/ x5 [5 \/ Z$ l. b前面说了,会有一堆初始化命令:
% Q/ |& y- P% ? v( s- : I1 Y- H6 n8 P
- /* OLED初始化函数 */
* g, Y8 R! Y7 _& d - void OLED_Init( void ): \) E0 w5 z- \$ C n, `6 l0 Q
- {/ E6 _1 E2 i* z
- /* 引脚初始化 */
d& f5 j. A7 ^# y9 E% ` - OLED_GPIO_Config();6 G3 X2 p6 r% u" z6 x
- 9 p8 I1 Q7 b- r3 Y
- OLED_CS(1);
. K2 Z7 k1 i; _1 S/ d - OLED_DC(1);5 a) H5 h* N: C
- , ` M& D) k9 Y2 {3 n/ l
- /* 复位 */# V7 @9 M7 S% s) y& D2 r( p9 g- B
- OLED_RES(0); I2 M5 e5 K' c; g7 d1 @
- Delay_ms(1000);
% u& V4 G* Z; P - OLED_RES(1);
, N+ ?6 j8 l) N8 A5 W: N' G - ; f/ o% S _5 y' ?
- /* 开始写入初始化命令 */
: n: `% K* C) U% n - OLED_WR_Cmd(0xAE);//关闭显示
' p, |8 N: w4 k - OLED_WR_Cmd(0xD5);//设置时钟分频因子. v! F/ O5 W$ o4 I7 x0 Z
- OLED_WR_Cmd(80);
4 I, E' H" Q4 y5 B8 e" O. ~ - / C* T+ v: _) z% A
- OLED_WR_Cmd(0xA8);//设置驱动路数
4 K5 u* C9 H6 \9 B - OLED_WR_Cmd(0x3F);//路数默认0x3F(1/64)$ }1 _& F. S1 S
-
2 I* ]% I; J K - OLED_WR_Cmd(0xD3);//设置显示偏移$ I# L1 w1 @% ]0 Y4 Q
- OLED_WR_Cmd(0x00);//偏移默认为08 p3 q0 N7 q7 P* k% |8 s/ ~
- ' ?3 b4 e) n6 ]/ F
- OLED_WR_Cmd(0x40);//设置显示开始行[5:0]
8 c- \ Z5 C% O8 `- o) W3 a - 1 }" W* W5 {' `. ]3 b
- OLED_WR_Cmd(0x8D);//电荷泵设置$ ?& @4 }& L8 I, F! ]1 V/ ]8 U) S
- OLED_WR_Cmd(0x14);//bit2,开启/关闭9 e) d+ V" C% K. w! R4 b
-
) `; b+ V# z3 Y! @ - OLED_WR_Cmd(0x20);//设置内存地址模式
p6 l, y7 E( B' k* d1 C5 M5 K: g - 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;" p' ^. q3 ^, ]' \4 g2 G# H
- 2 n! S) U: @/ U* }$ H7 n. W
- OLED_WR_Cmd(0xA1);//段重定义设置,bit0:0,0->0;1,0->127;4 _- r" Y) c$ h' M x; X
- 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0 n; K6 V3 q& K* N1 |8 t5 l
- OLED_WR_Cmd(0xDA);//设置COM硬件引脚配置: R, R& E! u6 v; j
- OLED_WR_Cmd(0x12);//[5:4]配置( F; P+ [4 ]' t( w+ U4 N+ l: N
- 2 h- ?$ l6 @+ G9 o Q0 k8 J* [
- OLED_WR_Cmd(0x81);//对比度设置7 Q2 { b7 Z5 F `; a9 F* w! j
- OLED_WR_Cmd(0xEF);//默认0x7F(范围1~255,越大越亮)
+ F# S$ }& I: k9 r - 9 w5 R5 y- z8 D8 ]$ A8 M
- OLED_WR_Cmd(0xD9);//设置预充电周期
4 m- {* r" N$ [1 { - OLED_WR_Cmd(0xF1);//[3:0],PHASE 1;[7:4],PHASE 2;
6 H! \. y% E/ n8 c6 F9 p+ c6 I - ) h4 \, p$ B2 C% W
- OLED_WR_Cmd(0xDB);//设置VCOMH 电压倍率5 A$ W, D: y: Y5 }
- OLED_WR_Cmd(0x30);//[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;
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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)
" {6 J \- X ^. r/ I* _& ` - OLED_WR_Cmd(0xA6);//设置显示方式;bit0:1,反相显示;0,正常显示5 B8 `# m2 X; W8 X
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! D7 t9 c8 l- X( Z1 z. r - OLED_WR_Cmd(0xAF);//开启显示0 i6 V8 f" J" A9 B
-
0 S; e7 T+ H! R6 E# E; T - /* 清屏函数 */- t2 C6 c) u8 n: }5 Z+ c! U/ s
- OLED_Clear();9 X6 Y, R8 B" d4 s! o0 q3 [
- }
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啥也不说了,照着写就完事了!9 K& R7 R, n' o& S+ z* k7 s4 S
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6 }1 Z) a! b1 z* U4.图像刷新与清屏函数
# r2 q3 w1 t9 F. `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:+ Q W, d6 C3 |
- /* 图像刷新函数 */) e' M" q% V5 x7 w8 M7 V
- void OLED_Refresh_GRAM( void )
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: Y: L+ Q, ]. V4 D! X4 [, ~% p - uint8_t i,j;
; `) @* ~1 A. N- o - for( i=0;i<8;i++ )
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- C) @# f, h8 B! ?% a - /* 设置显示的起始地址 */ t: d# ?% f0 e
- OLED_WR_Cmd(0xB0+i);//设置页地址(行): ^' F+ c. m+ u0 b4 v
- OLED_WR_Cmd(0x00);//设置列地址的低四位
+ Z) N% E0 {3 U9 } - OLED_WR_Cmd(0x10);//设置列地址的高四位/ y/ E t& p3 J
- for( j=0;j<128;j++ )
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7 s1 S" {! W" n. W* Q% B0 w - OLED_WR_Data(OLED_GRAM[j][i]);//将GRAM中图像信息写入屏幕" v4 o( ?4 @! b
- }
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9 [: V( G; Q3 @3 M; s( M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:
5 I. D! X4 H) L& K; b$ V- * 清屏函数 */( g# g2 a9 T+ h
- void OLED_Clear( void )6 F/ b& T. T' C! e U; [1 d( R
- {
/ a% L, l8 U; S. o0 _/ Z0 Q - uint8_t i,j;. K/ A. W2 M7 `* E, q* }' a
- for( i=0;i<8;i++ )2 v9 I: ?: a( o" J& Z" s
- for( j=0;j<128;j++ )
) T- ^, V4 z) a* o6 ] - OLED_GRAM[j][i]=0x00;( v6 E, W2 y: ]& q8 [6 F# ~
- OLED_Refresh_GRAM();+ R$ M+ a+ k7 C% p
- }
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: k. [& i( C0 A9 T! `8 x# J; K5 G5.画点函数0 c8 p, m8 q5 ^" L( M$ T& b
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:
% F. \; g0 i# {# b% P& Y, N- //OLED_GRAM[128][8]
8 n$ P* \; L: A! _% z - /* 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
: u2 E' y- h- q7 S, F. G - (x,y)坐标换算:OLED_GRAM[x][7-y/8]|=1<<(7-y%8);
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- K ?+ B. Q- T8 Q- mode取1正显,取0反显# w* g! F1 g# U! g* @
- */
$ A% S' p4 P% Q8 I. [: n - void OLED_DrawPoint( uint8_t x,uint8_t y,uint8_t mode )
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- /* 主要是求出y坐标,根据y坐标来位运算OLED_GRAM中相应的位 */5 [; T' e( Y0 J/ ~5 k7 B
- uint8_t i,j,temp;
+ l' B: \/ r! J- b( { - /* 判断坐标是否超出范围 */9 X& J) f) U' T& s% [ Z {
- if(x>127||y>63)return;
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- i=7-y/8;//算出第几页
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- temp=0x01<<(7-j);//由位运算精确找出坐标像素点: Q3 T3 b* Q/ {# W
- if(mode==0); x9 l( ], U$ g
- OLED_GRAM[x][i]&=~temp;* o% S# U' N5 [' G6 a$ C+ C# D6 U% V
- else
! A! W5 v4 o% V, u4 K3 \) O: w - OLED_GRAM[x][i]|=temp;+ d8 d7 |' J0 \ m4 A
- }
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) T4 g& X z& w& v' ]6 ?; V6.显示字符函数9 u7 F( s+ \9 Z; N; Z. `
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:
! {1 P8 Y7 o9 |4 t- /* 在(x,y)坐标正显/反显指定大小字符chr
7 ]" o+ d: A( ?9 b7 K - mode:0是反显,1是正常显示4 c* f7 q) P1 b' Y
- size:12/16/24
- `( ]# E" n" f1 Q, s2 q9 |" r6 \1 |3 Y - 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 )0 j. C& l1 E* K/ ]5 e
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- /* temp是当前对应的一个字节的点集,y0是初始坐标 */, y$ {0 Z/ i) J$ T3 F0 H# a: L
- uint8_t temp,t,t1;/ Y" V& ?0 p. n0 J) U
- uint8_t y0=y;: y, Q$ Y( t! S
- /* csize是单个字符所占字节的多少 */
6 X, B6 E; c5 j- F. }. a* q - uint8_t csize=(size/8+((size%8)?1:0))*(size/2);
5 D" N' e3 V) r P7 t. r" T - /* 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) */
" u8 s0 Y Q% u* f2 B# c - /* chr会锁定字符在字库中的的序号 */
2 r" |- M6 i& _0 ?( k8 L - chr=chr-' ';
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- /* 相应字符点集有多少个字节 */0 _9 C% {- L7 y2 \
- for( t=0;t<csize;t++ ); \4 O2 ^, U2 _
- {
" ]/ d3 P0 P F; B& _; t' D6 R - /* 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 */
% n5 n. `- ?: i- L: |& C5 ]5 A - switch( size )6 z0 G/ Z2 O# v( X( A8 e) V: i
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- case 12:temp=asc2_1206[chr][t];break;//12x6(行x列)
. l6 w& g0 `6 w) ?2 h7 V - case 16:temp=asc2_1608[chr][t];break;//16x81 ]. n4 [5 P, u* i7 h& L& I$ _
- case 24:temp=asc2_2412[chr][t];break;//24x12 L/ @5 d8 A) B
- default:return;//没有相应字库
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- /* 画出每一列的点 */
! y( h. M3 p" Q: i# l) N$ K - for( t1=0;t1<8;t1++ )
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9 ` J! S, ]9 x - if( temp&0x80 ); O3 U7 ]6 n$ n1 Y
- OLED_DrawPoint( x,y,mode );
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- OLED_DrawPoint( x,y,!mode );3 t2 ?- N2 G1 R% {. ?, T
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- temp<<=1;
( d2 w9 Z$ Y' i. Z( W0 M) x - 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:9 @0 t/ V# C- t
- 满了就换列,不满继续在此列画点 (与字库画点原理相关) 2 ~( Z0 A3 S' I1 a0 P
- */
9 U/ ^' r3 ^+ Y, E0 P, T" g - if( ( y-y0 )==size )
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% e, S8 I, i( W! ?) M - y=y0;6 r+ e% @- V# x3 c) P1 r/ ^, c
- x++;
# @3 Q. z/ U/ n! q8 c2 \2 B - /* 一列满,跳出循环,直接转到下一个字节点集的打印 */
/ q# m$ q: n e8 m& h - break;" {. }" l2 r3 r# G0 b& _
- }
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- }
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8 o; y4 }1 p" O1 v- u$ \7.显示字符串函数9 z H8 O& @* x
显示字符串,就是显示字符的加强版:
* d( m9 q5 m; q( W9 K- /* (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 */
: ^: t$ m5 b/ R/ d - void OLED_Show_String( uint8_t x, uint8_t y, const uint8_t *p, uint8_t size, uint8_t mode )& ]6 d- T+ ?; q; {3 z. }
- {9 c/ f$ t* P0 y" {* Z
- /* 判断是否合法字符,同时也限定了范围 */
( _- l" Z2 h+ ~( o. L - while( (*p<='~')&&(*p>=' ') )
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, S+ E) w3 b! j" g3 `) H3 Z - /* 如果初始行放不下,移动到下一行 */% P( N( F! u; s7 ]+ e
- if( x>(128-(size/2)) ); j4 @9 g% @$ J# n& \1 X U
- {
+ x6 D) ?0 t+ a, X - x=0;; k( K1 k" j2 t. A5 o/ S! B
- y=y+size;9 ^' ^+ j+ ~5 h9 R, x' a
- }4 z* a& b( I L* T. h
- if( y>(64-size) )
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- x=y=0;" [- O/ }. T4 Y
- OLED_Clear();
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3 Y" r5 J( y% D( M7 d% c5 j0 @ - OLED_Show_Char( x,y,*p,size,mode );
% I5 \; [, ?* k3 J - /* 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 */! D* w& Y2 [& X7 L, m
- x=x+size/2;9 v4 Y9 q. e3 t# y H' e9 b
- p++;8 o+ C! M; Z' T4 y, ]
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- }
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8.显示特殊图像8 ^4 a3 R' T2 s, H: c% Q
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!+ [5 |. J- \! T" M; x+ }# V
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2 P. @, _& T0 b/ i- G# \版权声明:Aspirant-GQ
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