一.OLED简介3 ^) ?# B& i3 F: M
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。/ B1 c1 E. U, `9 Q' V
模块特点:
' o# s2 h, E, j7 r: l! ]8 F' x' F没有背光,需要通过写入指令来开启显示; k2 B. e) z+ s, x
尺寸小:0.96寸,分辨率高:128*64/ _! R" z8 [4 k/ b8 g4 b
提供多种通信接口:6800、8080、3线/4线SPI、IIC
2 p5 C& R2 Q/ r& g/ H供电3.3V; o. w( ]! A7 h& ^( a3 f2 Y
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; f# }" b0 g: L# [. ?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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我是使用4线SPI驱动OLED的。9 _( o( @& Q+ n- _2 b' X
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二.驱动SSD1306所需知识. ?3 L" I. }* a0 N) ?& f
1.引脚介绍
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如图所示,各引脚的介绍如下:
6 N" N7 V) I- s' p& `8 rGND:接地引脚
8 m! U+ q7 `. oVCC:接电源引脚,接3.3V直流电源即可' w2 n8 |7 E4 I$ k
D0:SPI的时钟线SCLK
) C: r: o* p/ N H( L7 H/ J' Z2 kD1:SPI的数据线SDIN, e, N1 ^1 `3 b1 m7 w+ {3 ]
RES:复位接口,低电平初始化(复位),正常时高电平
- _0 m6 e$ e& T' u7 {" T/ H& [DC:用来选择命令or数据,低电平命令,高电平数据8 x5 W5 P! h: q9 W
CS:片选线8 S9 O8 g" S- L( J4 q( P
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注意:4线SPI模式时,只能写,不能读!: h& @& x% V0 \- Y- E# {6 V
在本文的代码中,对应的接口如下:/ m& e# `$ Z9 r( ]1 s
SCLK C0 D0
! P R( M( v& d( X) f2 PSDIN C1 D1" z* f! I" ?9 Z. X% ~8 G: L5 p- @% j. ]
RES G15 拉低时初始化(复位),正常时拉高
6 m5 _, L& V1 h- m3 N- r7 }8 I7 JDC D3 (0:命令 1:数据)3 m2 t' S+ { q4 @
CS D66 ?% A& d0 f4 P- k5 y! x q" a
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& S/ c, ~6 W2 ?2.通信时序
/ o$ `" |/ R3 r+ U2 f# w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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# I1 ]9 T8 h2 p) f5 U由图知,SSD1306与单片机通信可以分为如下几步:
% [/ E$ y% ~6 C: [# y1.拉低片选CS,作为正常通信的前提, ?3 U# o: K7 P5 ]2 T$ A4 e- N
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
, {1 {8 `5 l. z! e' Q% G3.时钟线SCLK不断产生时钟信号,上升沿数据线有效1 B) M. L, p9 e& H, f7 h i
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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3.显存GRAM" K9 W, v- X0 {( u6 K
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。
0 F. ?) L# r7 Y5 hSSD1306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 k% L$ n/ ~9 Z* o4 M* p! `
SSD1306的GRAM与屏幕上像素点的对应关系表如示:3 t) Z+ Q6 k& R7 t7 r8 o# M
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/ i. ?" a# ~) c" C7 y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!, f: u3 ~7 @: _8 c) g4 F) y
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:
* O' d4 f) f" Z5 O( ?- /* OLED的显存 */& j3 V# [4 H' ^2 G D2 V- @
- uint8_t OLED_GRAM[128][8];
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- OLED_GRAM[128][8]中是8位二进制为一个单位9 y% Z& F! a3 I9 B% u, w
- 其逻辑排序如示:(高位先行)
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复制代码
0 l" U* r' A7 j2 f3 _/ m4 T% o8 E' j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。/ e- B9 M. ]: f
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1 z4 B- K$ Y0 X J. ~1 D8 w7 C4.字库
: _. Y0 w+ L6 F3 ~3 C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。
0 u ], [# T8 K) U* z# R本项目所使用的字库大小有(高x宽):12x6、16x8、24x12
7 ~. Y8 L$ G" t/ S8 R$ X) M0 X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)1 H# g& u5 E/ L' I w- R( U, R( ?6 G
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) ^7 ]$ s. T3 {7 |% L比如12x6字库信息如示:
! d! e4 W6 }. D2 o- //12*6 ASCII字符集点阵4 z2 h5 X; | o$ X
- const unsigned char asc2_1206[95][12]={; ]+ K: Y4 r" c
- {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/
T, a- o* J/ s/ E' L2 z - {0x00,0x00,0x00,0x00,0x3F,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*"!",1*/
% ]0 M1 q9 e8 w& { - {0x00,0x00,0x30,0x00,0x40,0x00,0x30,0x00,0x40,0x00,0x00,0x00},/*""",2*/6 M/ A1 U9 V" E/ s5 X$ W1 m8 S
- {0x09,0x00,0x0B,0xC0,0x3D,0x00,0x0B,0xC0,0x3D,0x00,0x09,0x00},/*"#",3*/
* @0 s, ?& x$ |4 _9 s0 _ H8 _ - {0x18,0xC0,0x24,0x40,0x7F,0xE0,0x22,0x40,0x31,0x80,0x00,0x00},/*"$",4*/
% R* d# I3 g$ [0 {" t - {0x18,0x00,0x24,0xC0,0x1B,0x00,0x0D,0x80,0x32,0x40,0x01,0x80},/*"%",5*/
# G7 k; g1 L8 a. T. p: c9 c i3 Q - {0x03,0x80,0x1C,0x40,0x27,0x40,0x1C,0x80,0x07,0x40,0x00,0x40},/*"&",6*/+ S9 Q5 [) x) L+ R" ^ x
- {0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/ D! S0 v Y; S
- {0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x80,0x20,0x40,0x40,0x20},/*"(",8*/# v: ?) K- k4 b7 _( w! b
- {0x00,0x00,0x40,0x20,0x20,0x40,0x1F,0x80,0x00,0x00,0x00,0x00},/*")",9*/1 u3 j6 ?4 C& g& o$ v8 Y- s7 S
- {0x09,0x00,0x06,0x00,0x1F,0x80,0x06,0x00,0x09,0x00,0x00,0x00},/*"*",10*/! T" } B; _8 [; A' ]- n2 J& F
- {0x04,0x00,0x04,0x00,0x3F,0x80,0x04,0x00,0x04,0x00,0x00,0x00},/*"+",11*/+ ], o; ^. j; O1 k5 S; p1 A! O& V
- {0x00,0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*",",12*/; k0 F7 \' h" g8 P
- {0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x00,0x00},/*"-",13*/; s6 `- U. }4 _2 v$ j
- {0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*".",14*/
( l8 {+ B2 i" ~: F5 J - {0x00,0x20,0x01,0xC0,0x06,0x00,0x38,0x00,0x40,0x00,0x00,0x00},/*"/",15*/% y; Z5 F( Y* @' @
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"0",16*/+ v j; n' d; b) v6 F
- {0x00,0x00,0x10,0x40,0x3F,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"1",17*/
7 f% x$ F$ ?; M$ q; O0 T - {0x18,0xC0,0x21,0x40,0x22,0x40,0x24,0x40,0x18,0x40,0x00,0x00},/*"2",18*/( H1 O$ e9 w2 w. A
- {0x10,0x80,0x20,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"3",19*/1 `! e4 _5 n q; n1 K2 i1 C
- {0x02,0x00,0x0D,0x00,0x11,0x00,0x3F,0xC0,0x01,0x40,0x00,0x00},/*"4",20*/
+ Z; P7 i! j, E! g! H- W - {0x3C,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x23,0x80,0x00,0x00},/*"5",21*/9 ~8 P4 k% t7 B8 \
- {0x1F,0x80,0x24,0x40,0x24,0x40,0x34,0x40,0x03,0x80,0x00,0x00},/*"6",22*/3 b9 Q1 D$ T5 o9 q% u7 h2 X
- {0x30,0x00,0x20,0x00,0x27,0xC0,0x38,0x00,0x20,0x00,0x00,0x00},/*"7",23*/
/ w. m C3 h$ Q8 ? - {0x1B,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"8",24*/; T+ z+ B3 Z) N- g
- {0x1C,0x00,0x22,0xC0,0x22,0x40,0x22,0x40,0x1F,0x80,0x00,0x00},/*"9",25*/6 q4 A0 h1 v% W, k0 l% M; e
- {0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*":",26*/
: V6 E# r; E b- g - {0x00,0x00,0x00,0x00,0x04,0x60,0x00,0x00,0x00,0x00,0x00,0x00},/*";",27*/
" m" {" P: B6 Q, Y* y% v( T - {0x00,0x00,0x04,0x00,0x0A,0x00,0x11,0x00,0x20,0x80,0x40,0x40},/*"<",28*/& J! q4 O8 n$ \: k4 w# U" ^
- {0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x00,0x00},/*"=",29*/4 f1 y0 H/ J0 R; [1 q
- {0x00,0x00,0x40,0x40,0x20,0x80,0x11,0x00,0x0A,0x00,0x04,0x00},/*">",30*/
6 d: E' Q; ]0 n! F7 x3 e5 } - {0x18,0x00,0x20,0x00,0x23,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"?",31*/, p4 T2 E% J9 m. V+ I/ R$ m
- {0x1F,0x80,0x20,0x40,0x27,0x40,0x29,0x40,0x1F,0x40,0x00,0x00},/*"@",32*/
8 U. n7 R. b, l - {0x00,0x40,0x07,0xC0,0x39,0x00,0x0F,0x00,0x01,0xC0,0x00,0x40},/*"A",33*/7 P+ C4 S2 m: d. t8 H8 M
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"B",34*/
: b H8 C& \9 D/ _ - {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x30,0x80,0x00,0x00},/*"C",35*/- T# Y" c' t5 O2 o* O
- {0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"D",36*/8 y" J0 o' o8 Z$ w6 \0 j5 G
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x40,0x30,0xC0,0x00,0x00},/*"E",37*/
L9 E# F1 R; n, g, P1 q A% \( P - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x00,0x30,0x00,0x00,0x00},/*"F",38*/0 g* ^$ V4 J1 H+ A$ g+ d4 x& r
- {0x0F,0x00,0x10,0x80,0x20,0x40,0x22,0x40,0x33,0x80,0x02,0x00},/*"G",39*/
7 f5 X$ R `+ Z% x% d9 T - {0x20,0x40,0x3F,0xC0,0x04,0x00,0x04,0x00,0x3F,0xC0,0x20,0x40},/*"H",40*/
; T1 Y5 b$ h) }6 f' g$ o - {0x20,0x40,0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x00,0x00},/*"I",41*/
/ m+ G" v, Y; f" E - {0x00,0x60,0x20,0x20,0x20,0x20,0x3F,0xC0,0x20,0x00,0x20,0x00},/*"J",42*/
) M) w W& |: U2 s, s - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x0B,0x00,0x30,0xC0,0x20,0x40},/*"K",43*/
( b: Y" v& V: y' v - {0x20,0x40,0x3F,0xC0,0x20,0x40,0x00,0x40,0x00,0x40,0x00,0xC0},/*"L",44*/2 J/ d% b' j7 r; r$ {5 E+ r4 h
- {0x3F,0xC0,0x3C,0x00,0x03,0xC0,0x3C,0x00,0x3F,0xC0,0x00,0x00},/*"M",45*/! ~. S9 { q! z& s! R) W W1 l
- {0x20,0x40,0x3F,0xC0,0x0C,0x40,0x23,0x00,0x3F,0xC0,0x20,0x00},/*"N",46*/- @! b; m0 }$ s7 j. H5 J% W
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"O",47*/9 X E8 z1 i' ^- F0 C0 E g
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"P",48*/
H& [$ e: v3 C8 I! d& x, C - {0x1F,0x80,0x21,0x40,0x21,0x40,0x20,0xE0,0x1F,0xA0,0x00,0x00},/*"Q",49*/ [- R5 G% T! H/ P
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x26,0x00,0x19,0xC0,0x00,0x40},/*"R",50*/" M4 K9 P) E) l+ n6 J) E' k, {! s
- {0x18,0xC0,0x24,0x40,0x24,0x40,0x22,0x40,0x31,0x80,0x00,0x00},/*"S",51*/
' n# W8 l1 S2 @% s Y! H - {0x30,0x00,0x20,0x40,0x3F,0xC0,0x20,0x40,0x30,0x00,0x00,0x00},/*"T",52*/6 J, B7 u+ m n- {
- {0x20,0x00,0x3F,0x80,0x00,0x40,0x00,0x40,0x3F,0x80,0x20,0x00},/*"U",53*/# R% ]$ ` i8 d6 ?& x b' H' g
- {0x20,0x00,0x3E,0x00,0x01,0xC0,0x07,0x00,0x38,0x00,0x20,0x00},/*"V",54*/5 D/ J: l3 a- A
- {0x38,0x00,0x07,0xC0,0x3C,0x00,0x07,0xC0,0x38,0x00,0x00,0x00},/*"W",55*/# \8 v& G1 @4 ]
- {0x20,0x40,0x39,0xC0,0x06,0x00,0x39,0xC0,0x20,0x40,0x00,0x00},/*"X",56*/ F3 O+ }/ F1 n# i" k! R
- {0x20,0x00,0x38,0x40,0x07,0xC0,0x38,0x40,0x20,0x00,0x00,0x00},/*"Y",57*/1 `5 T- F+ Q0 o' ^' `5 z5 @
- {0x30,0x40,0x21,0xC0,0x26,0x40,0x38,0x40,0x20,0xC0,0x00,0x00},/*"Z",58*/
1 h% P7 b5 \) ~ - {0x00,0x00,0x00,0x00,0x7F,0xE0,0x40,0x20,0x40,0x20,0x00,0x00},/*"[",59*/
4 [. v" z' N8 t3 j$ ~9 _! r - {0x00,0x00,0x70,0x00,0x0C,0x00,0x03,0x80,0x00,0x40,0x00,0x00},/*"",60*/
+ G& B+ h# H$ a. m# c - {0x00,0x00,0x40,0x20,0x40,0x20,0x7F,0xE0,0x00,0x00,0x00,0x00},/*"]",61*/
! a7 p/ m" n3 q( _, |6 @0 V - {0x00,0x00,0x20,0x00,0x40,0x00,0x20,0x00,0x00,0x00,0x00,0x00},/*"^",62*/
# ~, j- s6 Z/ X$ ^( C/ @- s9 K) h - {0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10},/*"_",63*/
) x& Z6 u E# d4 A - {0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/ q4 {( g+ p9 ?+ y& O9 G& H* a
- {0x00,0x00,0x02,0x80,0x05,0x40,0x05,0x40,0x03,0xC0,0x00,0x40},/*"a",65*/. h& C" A( d7 z# @$ p: p/ Q
- {0x20,0x00,0x3F,0xC0,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"b",66*/
# i! K- b" ^3 Z, ~8 n+ [9 c% z - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x06,0x40,0x00,0x00},/*"c",67*/" M4 E d, c6 t$ t: p! e, f$ J
- {0x00,0x00,0x03,0x80,0x04,0x40,0x24,0x40,0x3F,0xC0,0x00,0x40},/*"d",68*/3 ]; [ f; k3 L1 t2 _, I
- {0x00,0x00,0x03,0x80,0x05,0x40,0x05,0x40,0x03,0x40,0x00,0x00},/*"e",69*/
; `1 m; ]' R. e3 {& y( h. x! x* y% @ - {0x00,0x00,0x04,0x40,0x1F,0xC0,0x24,0x40,0x24,0x40,0x20,0x00},/*"f",70*/% }9 c( C1 g, M3 N7 y. N
- {0x00,0x00,0x02,0xE0,0x05,0x50,0x05,0x50,0x06,0x50,0x04,0x20},/*"g",71*/0 J: t# [" M0 w+ q" ]9 ?0 G" `
- {0x20,0x40,0x3F,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"h",72*/
/ |# |3 ~4 u( j+ I; A9 D0 x8 f - {0x00,0x00,0x04,0x40,0x27,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"i",73*/
+ K- `5 u- a/ f% y - {0x00,0x10,0x00,0x10,0x04,0x10,0x27,0xE0,0x00,0x00,0x00,0x00},/*"j",74*// J+ F" ^+ B& N$ ^0 q
- {0x20,0x40,0x3F,0xC0,0x01,0x40,0x07,0x00,0x04,0xC0,0x04,0x40},/*"k",75*/2 Z) y9 y) J* O! J9 P0 v: k
- {0x20,0x40,0x20,0x40,0x3F,0xC0,0x00,0x40,0x00,0x40,0x00,0x00},/*"l",76*/
! e) ~5 W+ i) ~# e0 u3 m - {0x07,0xC0,0x04,0x00,0x07,0xC0,0x04,0x00,0x03,0xC0,0x00,0x00},/*"m",77*/ Y5 R7 t5 G* K% h& Y, Y: F
- {0x04,0x40,0x07,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"n",78*/
/ g d+ a- l7 | - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"o",79*/
$ E& X: u/ x' t( \ - {0x04,0x10,0x07,0xF0,0x04,0x50,0x04,0x40,0x03,0x80,0x00,0x00},/*"p",80*/
1 I8 D' H @1 D4 z - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x50,0x07,0xF0,0x00,0x10},/*"q",81*/' F: K! z" B" M/ `" B
- {0x04,0x40,0x07,0xC0,0x02,0x40,0x04,0x00,0x04,0x00,0x00,0x00},/*"r",82*/! } j2 _) I5 C) N8 a
- {0x00,0x00,0x06,0x40,0x05,0x40,0x05,0x40,0x04,0xC0,0x00,0x00},/*"s",83*/
, m1 K; s! e# M( M& _$ Q8 z - {0x00,0x00,0x04,0x00,0x1F,0x80,0x04,0x40,0x00,0x40,0x00,0x00},/*"t",84*/
" {3 ?4 v" u+ X8 ^0 i+ l, Z - {0x04,0x00,0x07,0x80,0x00,0x40,0x04,0x40,0x07,0xC0,0x00,0x40},/*"u",85*/: k' U, t, D3 t1 N9 j
- {0x04,0x00,0x07,0x00,0x04,0xC0,0x01,0x80,0x06,0x00,0x04,0x00},/*"v",86*/
% G6 a G6 ^8 D6 P: e - {0x06,0x00,0x01,0xC0,0x07,0x00,0x01,0xC0,0x06,0x00,0x00,0x00},/*"w",87*/
& D3 y! l: W6 R+ e - {0x04,0x40,0x06,0xC0,0x01,0x00,0x06,0xC0,0x04,0x40,0x00,0x00},/*"x",88*/
7 _, g3 ~7 `) Y/ Y" N - {0x04,0x10,0x07,0x10,0x04,0xE0,0x01,0x80,0x06,0x00,0x04,0x00},/*"y",89*/
: b* q) j" ~ ~9 ` - {0x00,0x00,0x04,0x40,0x05,0xC0,0x06,0x40,0x04,0x40,0x00,0x00},/*"z",90*/
% b- ~# S. j4 U; _$ Z) o( b0 `+ `; \ - {0x00,0x00,0x00,0x00,0x04,0x00,0x7B,0xE0,0x40,0x20,0x00,0x00},/*"{",91*/7 H; i& }; _, w+ K! z' ~
- {0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF0,0x00,0x00,0x00,0x00},/*"|",92*/& o: ?2 H3 J; J( Z
- {0x00,0x00,0x40,0x20,0x7B,0xE0,0x04,0x00,0x00,0x00,0x00,0x00},/*"}",93*/+ D; D) {$ j8 ]! b
- {0x40,0x00,0x80,0x00,0x40,0x00,0x20,0x00,0x20,0x00,0x40,0x00},/*"~",94*/. t$ A( P c! d9 ]5 q
- };
% X! z) x( u, U, \" d
复制代码 7 i( f' u% R Z# t: F% ?' d
5.SSD1306基本命令7 I6 R+ q3 } k
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。
" q6 Z& O V: _6 t# `) V; |- x& h8 }( Q, |- v* t
' M. i) T1 g% v: J暂停一下!!!捋一下命令与数据的关系:
f- X, D2 Y+ o8 a" l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!
; f/ o: y* z7 J; o9 O) e8 F L2 r( m. e- c# d, E5 k
- C; V' {. X r* S& Z' H4 F) A
一些常用的命令如图所示:
' h0 S& s# p+ [5 o
( F* V( z }/ U, _3 _ `% B* m$ \% k3 `! M
9 |* F+ f0 M. u
. i1 r' l8 Y+ E, s: {2 v
7 z# F" H4 g% M. }* y0 y( z8 x0 I* d比较重要的是设置起始坐标的三个命令
* w- J/ k" B3 [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。- s" _; f- d0 d1 n
命令为 0X00~0X0F,该指令用于设置显示时的起始列地址低四位。
* B# o; @2 K. }$ E命令为 0X10~0X1F,该指令用于设置显示时的起始列地址高四位。4 V1 C* C6 M. o" b) ~
! A$ i2 C2 q# s
6 {6 L$ \, B% L: H& o! x有关初始化OLED的所有命令会在下午代码讲解部分列出! \0 k8 j- F1 `# J* O# d* m; {
1 H: [* I* ? ~- ^
7 h( a9 `+ {6 N" O3 e三.代码讲解
- q) e3 U6 X$ I3 L& |1.相关引脚配置
0 \ \ ?3 l7 y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:# T9 j7 @$ Z2 }4 _# l
- /*
) N0 @# f) K1 Z8 b8 _8 J - 配置4线SPI模式的所有引脚
. R5 S+ N1 ~8 [, Q$ @- a5 n - 4线SPI模式只能写,不能读# I# `/ ?( r5 o; C5 I1 L6 {6 V# C- t
- SCLK:PC0 D0 5 U+ }$ O [% w: q+ Y! ^
- SDIN:PC1 D1' `. V# `8 t( a) A$ Z
- RES :PG15 拉低时初始化(复位),正常时拉高, L- y- V1 ^1 ]- o v, d/ `2 v/ L/ h
- DC :PD3 (0:命令 1:数据)/ r, k0 N h# G
- CS :PD61 K5 s- b0 G: D- V, [, B
- */
8 Y" h9 S, j' W0 r2 s A! X - void OLED_GPIO_Config( void )0 e& q& e! X# w. o* @- a
- {$ T; O' v3 S( L2 r
- GPIO_InitTypeDef GPIO_InitStruct;5 @7 \! f) n0 _+ L) S7 d
- & S/ o5 R# Z, O& F5 n+ G2 Q
- RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOG, ENABLE );
& a" u7 t g8 \, x& \; i: m# h, i - . H- I2 L+ o$ z. V8 q' i+ x
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
1 X u4 E8 m' c9 p - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;7 V. u5 [% n9 |; r
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;6 R P4 O0 B; {* f/ S
- GPIO_Init( GPIOC, &GPIO_InitStruct );
; L& ]) M. S2 \3 j. N% X -
2 t6 }8 ^8 H3 s! T. I6 }) j. _ e5 z - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
. N* y" Z0 C7 l: M6 [3 e# k% ` - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_6;8 b# |. F! T+ O3 S) \5 W; J
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;8 c: I, k% D. n3 |8 V% {( U* c
- GPIO_Init( GPIOD, &GPIO_InitStruct );
: q3 [7 k$ y+ p' N; A - 0 V9 h6 M7 z& l: Q X5 J4 s5 I
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
" j0 ^5 N( N: `6 k - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;0 P# g3 h8 m% |, V7 v% Z6 g8 D
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;- Y* V8 r" k. U
- GPIO_Init( GPIOG, &GPIO_InitStruct );. Y9 u/ x$ W5 ~! E& \; C6 T4 u6 k$ ^
- }
) l( j5 }9 Q% b
复制代码
- W: M. i, {! {/ W! o" E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):8 q- Q; O5 z! g8 ?% s
- void OLED_SCLK( uint8_t x )/ s* s! \, Z" S. d
- {$ k J- W; s. z
- if( x==1 ). p5 T: k( p& W$ o/ |
- GPIO_SetBits( GPIOC, GPIO_Pin_0 );; ~7 G4 j( _9 R7 f
- else3 \, \; n# o8 u7 K& w. Q- E8 K( o3 F0 }
- GPIO_ResetBits( GPIOC, GPIO_Pin_0 ); p7 \' ^$ @" e0 ^: a
- }2 R0 R( f: A! Q0 S: |/ C- N
- , `, u0 R2 k0 H) h) q
- void OLED_SDIN( uint8_t x )7 v! f; X: C9 I& i: j
- {9 z0 e3 Z1 e& P T. x: |
- if( x==0 )
% q! z4 R& S- Z. j2 z - GPIO_ResetBits( GPIOC, GPIO_Pin_1 );
0 o/ b0 s2 b& h0 W/ M9 W- g+ p - else u8 J: M( f' B+ p, ^4 ^2 w
- GPIO_SetBits( GPIOC, GPIO_Pin_1 );( t7 m1 p* E7 R0 b( u3 O
- }
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) k5 p- Y7 Z9 O, M" J" Z- void OLED_RES( uint8_t x )
3 f) s* P! X) r0 i0 ^: F/ T - {! F7 l# T T* P, Y J! p+ d
- if( x==1 )
4 T: M" ]1 f8 B, [ - GPIO_SetBits( GPIOG, GPIO_Pin_15 );
G4 R% d2 N3 o8 a" q$ B' B - else! H L$ O+ i k m' P1 x' R5 f
- GPIO_ResetBits( GPIOG, GPIO_Pin_15 );
* E3 m/ F/ ~* t/ m+ T: K5 d - }- p# g3 u( t" I$ ?1 L
- 6 w+ p8 L' s$ M( M% G, V
- void OLED_DC( uint8_t x )3 \% z' _. q3 u" Z9 W" \, ^
- {
$ ^: X" s8 y$ \/ j5 X7 P. Y - if( x==1 )
7 ]7 z! B# S; }+ G) Y# i+ c8 E5 C - GPIO_SetBits( GPIOD, GPIO_Pin_3 );" D. \* A, a# ?0 V' f& x* _
- else# S' I/ z$ p" W
- GPIO_ResetBits( GPIOD, GPIO_Pin_3 );; G( Y: q8 N7 q$ @9 B
- }
9 a" X. k( _& S - # {+ j2 E" f* d$ r: h- v; H
- void OLED_CS( uint8_t x )
e" ]0 v' k; s. _( C' S - {
" E0 S! e; M+ X0 g+ @ - if( x==1 )
( k* ]/ V6 I$ R! H8 X1 D$ m - GPIO_SetBits( GPIOD, GPIO_Pin_6 );
8 E9 ~/ B0 i4 @/ _9 O- U8 L4 e - else( x% g# j# P- U% z( V1 J& M' R
- GPIO_ResetBits( GPIOD, GPIO_Pin_6 );+ {6 ?7 T# t6 e: k( i. _6 s
- } f; U# L1 f) X4 Y8 R) j
复制代码 ; U8 q6 G" t4 H" P2 P5 j0 ~
2.模拟SPI通信. ~- D: k( Z0 w1 y) P/ s
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:7 U+ ^# F/ k( r3 O; b" Z
- " i) P4 Y& [. }. G
- /* 写一个命令 高位先行 */
% y* |2 \" ?' g. q) ]# v2 M - void OLED_WR_Cmd( uint8_t cmd )
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- uint8_t i,k;
1 e% z4 ? S2 T+ ~/ v2 y& u( _ - /* 拉低片选CS,写命令拉低DC */
* e1 w, C, |, h* X - OLED_CS(0);
* w0 b0 G( X8 G1 D( X/ d - OLED_DC(0);8 F( q1 ^- E. Z x6 e$ {$ o
-
$ n) M# E, j" g: ~ J# L1 s - for( i=0;i<8;i++ )
9 `% L. ^, ~9 C& y# q4 Y - {* | k: x5 F# {; H) y
- /* 时钟线,上升沿有效 */
' w5 a) J, J6 v$ L+ W9 A - OLED_SCLK(0);% {8 u' {/ S1 D3 [2 ^* U2 ~
- k=cmd&(0x80);0 `0 N9 V; M' A/ I: M2 V: W% g
- OLED_SDIN(k);& [- {2 v: c% Y' \. {, j0 k
- OLED_SCLK(1);4 A0 Y; p$ L: C; D# r
- cmd<<=1;! ]4 @. r0 d2 f t
- }4 J( \4 F9 u7 u$ N0 R2 h
- OLED_CS(1); q$ ~, H5 \, X7 k& L
- OLED_DC(1);
& u# t* K7 J; l; a& E' p - }
, X) E; ~% Z, R' O* T) x+ U1 _ - 6 t7 _7 j6 ?/ f& K0 e
3 m/ ]& |. A6 L: H9 X- /* 写一个数据 高位先行 */
: h1 [+ L5 |# x+ t K* o( j k9 L - void OLED_WR_Data( uint8_t data )
* Z& A8 t" W5 I& s5 p - {
; T! r7 P+ u0 r - uint8_t i,k;
% G! d; u4 Y. p% u - /* 拉低片选CS,写数据拉高DC */5 w) a L: G8 f) u5 ^8 i) M
- OLED_CS(0);
$ r3 H+ M1 j: m, @ E# | - OLED_DC(1);
) U$ r5 x( z+ Q& ]7 ~; o% R" x* S - 2 s6 G7 q$ h5 h5 g G* ~ d/ M7 ~. W
- for( i=0;i<8;i++ )% o. t. t. w7 v( M# X' i B4 ^
- {7 s. `1 M" ]8 o$ Y7 |
- /* 时钟线,上升沿有效 */
0 B; D# N, l U n d0 X - OLED_SCLK(0);
. k0 ~: a& G" y4 v/ ?5 i% U2 t - k=data&(0x80);
0 V, |$ c9 [; d+ u8 [ - OLED_SDIN(k);
/ \1 d- |5 G9 [1 l - OLED_SCLK(1);
( \+ F9 z* r5 L, n% M2 [( [ - data<<=1;
0 r+ ?8 o; l4 E4 ] - }
3 S; j. T; \- ?3 `8 `! E: l# r - OLED_CS(1);3 G2 n5 P; F# Q7 c" L: |
- OLED_DC(1);5 V9 P% o8 S( w0 F | E2 C
- }1 D5 ~/ x3 ~. G% f
复制代码 ( U+ F; F2 Y5 h: S* R
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。6 g4 x5 z; M4 s
& J X3 d4 i" y! L" H T9 X3.OLED初始化函数0 t& I8 L# N* H8 k( x t" ~
前面说了,会有一堆初始化命令:* H4 b9 Q% A# ~
1 g- c6 { ?& @- X3 V2 ?- /* OLED初始化函数 */( _, K+ K# u% f
- void OLED_Init( void )$ Y+ [; s: \) [6 @9 \# [% e8 s; K
- {
- f; \ ?$ x# W7 u6 |) @5 k - /* 引脚初始化 */, @0 M w8 o0 Q: G# d8 e# ^
- OLED_GPIO_Config();) ^( s( z- s* p) x- q$ C
-
; Z9 O K; Y _8 n, X+ w* o* e - OLED_CS(1);
" Y1 R# R5 T+ r: Q; z1 f - OLED_DC(1);
4 |+ t5 A6 ~+ ?; ^9 Z - 0 O5 }% M. l; p5 n8 p6 U
- /* 复位 */
3 ]& U1 S1 T% J& u$ L" a - OLED_RES(0);
. L6 U% O3 c2 f) R - Delay_ms(1000);
& Z: x; I" n# N - OLED_RES(1);" x) w" Q; W9 l/ Z7 |+ B; v
- 7 C& d) s3 k( m1 @2 g% q
- /* 开始写入初始化命令 */9 J3 `7 L! Z! }& U8 f: z% j9 ]) S
- OLED_WR_Cmd(0xAE);//关闭显示 Y" j' N. f! {% o
- OLED_WR_Cmd(0xD5);//设置时钟分频因子: Q6 f5 n* ]$ Q* e7 O% X( {, C' R
- OLED_WR_Cmd(80);4 Q- ]5 ?/ y- }. M. L
-
( e" w" g+ h5 d! L - OLED_WR_Cmd(0xA8);//设置驱动路数, A( I% I- m/ o/ {$ H3 g
- OLED_WR_Cmd(0x3F);//路数默认0x3F(1/64)7 A/ i: V4 o i: b' o s: I
- / Y0 `: a; a$ B1 {2 r( R& r2 w
- OLED_WR_Cmd(0xD3);//设置显示偏移
1 v. D6 n6 ?6 g" F/ L# n - OLED_WR_Cmd(0x00);//偏移默认为0! s g. Q# \1 ]+ N" h
- , G% ^% R% j$ r- S
- OLED_WR_Cmd(0x40);//设置显示开始行[5:0]* M, L! q& ]0 W* y% z" y
- % Q3 q2 f" L6 K; L- Z( k$ P
- OLED_WR_Cmd(0x8D);//电荷泵设置
/ c- A8 f/ n( p - OLED_WR_Cmd(0x14);//bit2,开启/关闭
: m; ~1 s6 V* ]. p; H3 p" ] - ' w3 ]4 s6 s# h% ~. `
- OLED_WR_Cmd(0x20);//设置内存地址模式/ {9 i7 V6 @3 I1 o+ H: x
- 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;
a+ s9 i( o6 I" T7 v+ } - # r3 w5 r7 k/ A5 K
- OLED_WR_Cmd(0xA1);//段重定义设置,bit0:0,0->0;1,0->127;) q3 L( M2 e1 X& Y" N5 g
- 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, r2 \3 z4 c" D" w2 w5 D
- OLED_WR_Cmd(0xDA);//设置COM硬件引脚配置
0 `9 H2 u- ]" d+ j4 R - OLED_WR_Cmd(0x12);//[5:4]配置
* q+ u/ I5 |4 n3 L! } -
3 C @% G, M* {; r - OLED_WR_Cmd(0x81);//对比度设置3 k* f# f9 w7 [; ^8 ~& `: i- d
- OLED_WR_Cmd(0xEF);//默认0x7F(范围1~255,越大越亮)
( F* a% s8 d8 h2 X; s) r - & O9 m! T; ~, m8 v
- OLED_WR_Cmd(0xD9);//设置预充电周期
& Y- A( l! }# a7 m8 D, R) y9 b5 X - OLED_WR_Cmd(0xF1);//[3:0],PHASE 1;[7:4],PHASE 2;
2 g3 d8 R5 j/ L0 u -
2 E, u. W! ^ |, S6 X - OLED_WR_Cmd(0xDB);//设置VCOMH 电压倍率
: w8 I! w2 V3 w3 l6 Z2 S; r - OLED_WR_Cmd(0x30);//[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;4 z. {0 P4 ]+ G' m+ g
- % {- r3 M* y- R
- OLED_WR_Cmd(0xA4);//全局显示开启;bit0:1,开启;0,关闭;(白屏/黑屏)
9 w6 ~& g0 k9 t8 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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6 F L4 b' A: H* J2 ]+ @ - OLED_WR_Cmd(0xAF);//开启显示7 ]1 S4 }! y/ f! p S; `
-
6 i/ E* D9 U7 _ - /* 清屏函数 */
) K/ R5 `6 i( I# ?2 Z$ i - OLED_Clear();- X) _0 S4 z! Z( q# f# K0 G7 ^
- }
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; y4 b% d+ m, Z7 Z- z* J: L& p3 W9 k啥也不说了,照着写就完事了!; K; G7 E# Q4 {) A9 {' V
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4.图像刷新与清屏函数2 q; D+ y8 D, |- n" j6 K4 \, a
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:
, o3 H4 r* f7 }- /* 图像刷新函数 */, i4 Q+ p& B* x5 i
- void OLED_Refresh_GRAM( void )
5 _7 d$ G6 j/ r0 z; a8 c e" a - {
% @1 o- p0 u$ p# N! j/ Z9 U/ u - uint8_t i,j;
3 J/ A/ `6 q+ q2 z3 X8 g" I - for( i=0;i<8;i++ )
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- /* 设置显示的起始地址 */
( W% Q) t0 j. B* l( ` - OLED_WR_Cmd(0xB0+i);//设置页地址(行)
0 a5 _3 G( Y$ B - OLED_WR_Cmd(0x00);//设置列地址的低四位
2 i$ |' n( Q2 M/ E$ i3 @ - OLED_WR_Cmd(0x10);//设置列地址的高四位6 u9 ]7 u/ g! L3 F# D+ Z8 P# l1 S, P
- for( j=0;j<128;j++ )
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6 W a3 ?# R5 F! r5 B - OLED_WR_Data(OLED_GRAM[j][i]);//将GRAM中图像信息写入屏幕
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- }
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$ T5 M6 S- i* {3 X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:3 Z# r2 Z" L& F
- * 清屏函数 */: ~" u! m! X c, P; y
- void OLED_Clear( void )
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2 W; q8 D! b- V; w - uint8_t i,j;1 U5 w7 }7 C2 A4 _7 q0 \3 K8 X
- for( i=0;i<8;i++ )
4 }- M* V9 I6 j W% a4 o - for( j=0;j<128;j++ )( G2 }5 s5 w- `, q Q
- OLED_GRAM[j][i]=0x00;+ f7 f4 ?( Y v2 T3 F* ?) d, |0 M" ^( Z
- OLED_Refresh_GRAM();1 W; \1 C; O2 V' U
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5.画点函数
( ~4 x# y. k7 m+ h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: w- D5 |1 @- l3 G/ u8 N4 F
- //OLED_GRAM[128][8]6 [8 w1 U/ i: y& K( M
- /* 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 ! ]- _( N4 J7 C
- (x,y)坐标换算:OLED_GRAM[x][7-y/8]|=1<<(7-y%8);- F* T a8 O( }& R, o
8 `3 ?7 T: f- b. ?: d1 j- mode取1正显,取0反显* U R8 d* `- [1 J$ Y6 b' ^) d" c
- */) W4 g+ f q, {) s7 q8 X3 z, e+ q
- void OLED_DrawPoint( uint8_t x,uint8_t y,uint8_t mode )9 k. c' I& |3 p, Z
- {( Q/ E+ e% _% {" o& ^3 J7 _
- /* 主要是求出y坐标,根据y坐标来位运算OLED_GRAM中相应的位 */6 J* b; y" L2 C }/ @
- uint8_t i,j,temp;
( l- G+ `: q$ E: M; {- k% U - /* 判断坐标是否超出范围 */$ i, z. @3 n s
- if(x>127||y>63)return;
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! i# X2 a. t( s+ `8 D - i=7-y/8;//算出第几页9 K- Z% x9 U- |; O7 i' `0 {$ u# ]
- j=y%8;
+ d, e$ `7 G% g! B - temp=0x01<<(7-j);//由位运算精确找出坐标像素点3 C; g f! o9 e! a% V" J
- if(mode==0)' _/ T( S& L, B
- OLED_GRAM[x][i]&=~temp;
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- OLED_GRAM[x][i]|=temp;
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6.显示字符函数
( h9 P& c2 _4 i* N4 \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:
% A" l" D6 f& n; I- |- /* 在(x,y)坐标正显/反显指定大小字符chr
7 [- K/ n/ v% t# E- p - mode:0是反显,1是正常显示, h+ c% k9 g: z0 Q9 @, [
- size:12/16/240 m: \* b G; D, L
- 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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- /* temp是当前对应的一个字节的点集,y0是初始坐标 */
4 Z: F S/ U& d' {* C2 i( V - uint8_t temp,t,t1;6 J5 z, ~: u1 d5 Y* W
- uint8_t y0=y;* T8 W9 u" r4 z
- /* csize是单个字符所占字节的多少 */
3 _+ ^4 R- [; c! T; z) w - uint8_t csize=(size/8+((size%8)?1:0))*(size/2);8 y7 [2 ^2 q9 d/ _6 o d2 M. W
- /* 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) */
5 _: g4 {. k `! D - /* chr会锁定字符在字库中的的序号 */- l- `/ u) _# f5 _6 H; e# F
- chr=chr-' ';/ T) o# ^2 c+ @. b8 \
- 2 H8 V9 q: o2 n% K, l0 Y
- /* 相应字符点集有多少个字节 */
7 L- k' R, d& @ - 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 */& f) I8 S1 T% {- u% {
- switch( size )
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" }. [/ g! `" V# b! ]' E - case 12:temp=asc2_1206[chr][t];break;//12x6(行x列)
% ]+ G, T {4 M - case 16:temp=asc2_1608[chr][t];break;//16x8
! Z+ X7 A: K( S& y5 \ - case 24:temp=asc2_2412[chr][t];break;//24x12
/ x0 y4 x* q( e% X - default:return;//没有相应字库
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3 r) y: o. m6 t9 q - /* 画出每一列的点 */
6 v- e/ a9 c: c3 Z# y - for( t1=0;t1<8;t1++ )
9 h5 C) b2 I/ y1 a* p8 q4 K - {
1 h6 e( ]9 o2 e1 G$ F" i/ V/ _ - if( temp&0x80 )
4 y0 x1 {- A& a9 R' Y2 l - OLED_DrawPoint( x,y,mode );% I# d& T1 U1 y: g( K6 [
- else: ?5 B0 Y& l+ a! V I
- OLED_DrawPoint( x,y,!mode );/ _( b# e! H. d; n+ R% {8 e. U' R
-
) O# \, B$ Y- `6 u3 y; U& ] - temp<<=1;7 h' i* m9 m) M
- y++;/ h0 w3 O2 V7 P* d0 T. B7 r% N
- 4 X# i7 G4 N+ W& W- W
- /* 根据给出每一列的像素点的多少,判断列是否满:9 @' n9 I% c9 C) j$ v7 o
- 满了就换列,不满继续在此列画点 (与字库画点原理相关)
* A) L0 @* L1 y$ x - */# n. J4 e! o& d2 H4 H @
- if( ( y-y0 )==size )
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) u" |% J: M+ j) z. y7 m t6 h - y=y0;
( J1 t/ A8 m- J3 V( a7 u: z - x++;) T4 ?' V8 R n; A, u5 ~
- /* 一列满,跳出循环,直接转到下一个字节点集的打印 */! q# y4 o% s" n9 o! H ~6 c
- break;
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- }
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( [; V6 c8 A: r3 I+ ]* l6 R- E# i7.显示字符串函数 p0 T7 X- e& x
显示字符串,就是显示字符的加强版:9 l0 O6 J+ z" h: ^: l. F
- /* (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 */* X( ^: b% O! E+ q
- void OLED_Show_String( uint8_t x, uint8_t y, const uint8_t *p, uint8_t size, uint8_t mode )" X* W y. `/ ~/ z) d, [! \) b! i
- {# }" c4 L0 r: N3 R6 i ]/ o# l
- /* 判断是否合法字符,同时也限定了范围 */( ?1 G( N9 ]! w/ f# R
- while( (*p<='~')&&(*p>=' ') )
; ], t% Z. E' _4 f - {
& b7 U5 W. K# U, ?" W - /* 如果初始行放不下,移动到下一行 */$ q% W/ u' \ Q# U
- if( x>(128-(size/2)) )8 n* B c" K" Q+ o# }
- {( g' @; |/ ~/ \! m
- x=0;
C/ \7 m* T) L. S2 G8 v - y=y+size;8 f% A2 `: K' i4 {; m
- } E# w7 o- o$ }; |$ V- U
- if( y>(64-size) )
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( U- r0 O1 a! Y - x=y=0;! G: D& H4 l4 e: S
- OLED_Clear();
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( a( o$ x$ G, q: i - OLED_Show_Char( x,y,*p,size,mode );+ S, z5 f, F+ o; l2 j: w
- /* 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 */2 N5 K, u* @ C6 Z
- x=x+size/2;
- l3 w% t1 J1 x5 K1 [' e- t9 Z - p++;
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" D0 g9 {, c, ]1 f; i8.显示特殊图像* a- ]* z" V) a$ G) J/ d/ 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!6 F# g- O3 \. q+ G, H' B' [
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5 M9 h1 b' f1 p& o/ a版权声明:Aspirant-GQ( c$ `$ p8 N* D, B; J
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