一.OLED简介9 Y* l- O: N- ]9 \4 p4 _+ y0 v+ g5 ?
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。
1 v% _0 {$ j0 c3 q模块特点:4 U% K) ~# E; {. l/ a' _2 |+ F6 W. Z
没有背光,需要通过写入指令来开启显示' Q$ Y, r9 a& m8 S9 Q
尺寸小:0.96寸,分辨率高:128*648 x0 f8 K$ j- h9 _
提供多种通信接口:6800、8080、3线/4线SPI、IIC
8 I8 O+ v6 W V* N1 w供电3.3V* L$ i- t9 P1 T8 S, j. c2 O. M& s
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) W. U4 n$ a1 b4 k' p, b5 P* a" k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:9 n- Z; z7 J% S! |! I3 J# i7 Z
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1 H. \6 {/ a! A5 l0 }7 y+ Q我是使用4线SPI驱动OLED的。( `: @ Z& S' Q. D* |; `
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0 w# ]' y0 |. L- q u二.驱动SSD1306所需知识
9 X$ \% _9 i/ o/ A) o1.引脚介绍
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如图所示,各引脚的介绍如下:
$ h! }- N6 s% }. F) e8 `GND:接地引脚
& w- l% W- H7 dVCC:接电源引脚,接3.3V直流电源即可
0 p: [/ b; z5 o$ P! tD0:SPI的时钟线SCLK
$ I: K7 _& v m8 N$ tD1:SPI的数据线SDIN
- R) Q' g4 N0 a, s6 ?6 p" [RES:复位接口,低电平初始化(复位),正常时高电平
, o! f7 G* l8 D1 Q& v2 o& n' `DC:用来选择命令or数据,低电平命令,高电平数据
1 T( D1 x( }# \( j4 l( K. bCS:片选线
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1 M# ?8 q4 B( {7 |9 ]注意:4线SPI模式时,只能写,不能读!, d, ]* W" f' {; l2 `) L
在本文的代码中,对应的接口如下:
6 M6 l9 l7 W, K( Q! cSCLK C0 D0 Z7 \" L& O! u* b" b
SDIN C1 D1
. ~$ H' i. `& f7 CRES G15 拉低时初始化(复位),正常时拉高 F0 V# I( N( L0 |6 B
DC D3 (0:命令 1:数据)
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; G3 h& ^; A. y3 B' J" ?# J2.通信时序, {. [: D% R5 C# {5 s9 \# ]
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:( `. K) F: x4 ]6 Q$ t
1.拉低片选CS,作为正常通信的前提
+ X- B% W& R: v* @) s2.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
& s+ ^3 z/ B" I9 I3.时钟线SCLK不断产生时钟信号,上升沿数据线有效5 }: Z' [- x; C: A
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06 b" V! B" k2 O+ f) n8 J R
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8 d5 g9 C, l( ~" c* P4 E* L! @3.显存GRAM
2 s' Q3 K8 E( p1 e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。; N' u' y" a5 @: p. @
SSD1306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。
/ M* A5 t, b& kSSD1306的GRAM与屏幕上像素点的对应关系表如示:
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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!
$ k0 V2 y3 d5 ]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:
+ y! S+ o/ |) g- /* OLED的显存 *// Z2 |0 p5 F) C1 ]1 T9 k( G9 W" t) T
- uint8_t OLED_GRAM[128][8];# v' E e+ K5 q6 A) V7 d
- /*
7 g4 v, n( C2 _, A4 z7 `- d( v y - OLED_GRAM[128][8]中是8位二进制为一个单位; x9 P$ ^+ K r4 d2 v/ j5 U' h
- 其逻辑排序如示:(高位先行)
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复制代码
7 t2 m6 W4 I7 [( e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。
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' G: W; Y( T% H5 x4.字库
, @, G8 w% q' ], K2 Y$ o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。
' U6 L7 D: t6 q! b. b本项目所使用的字库大小有(高x宽):12x6、16x8、24x12
! `7 C% e( f* k) K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 S( Y5 i! j, ?5 \: i
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8 [$ y) A3 l4 _
比如12x6字库信息如示:
( G, F: X9 K8 P5 d$ C4 a- //12*6 ASCII字符集点阵
' Y$ P% `# }3 ?5 g - const unsigned char asc2_1206[95][12]={4 i" @8 j) R: {+ v$ g s
- {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/
; u& h# X9 e7 \# l& K3 f - {0x00,0x00,0x00,0x00,0x3F,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*"!",1*/
) ` B E$ H% _! d! ~; v - {0x00,0x00,0x30,0x00,0x40,0x00,0x30,0x00,0x40,0x00,0x00,0x00},/*""",2*// s0 t& [0 Z9 [
- {0x09,0x00,0x0B,0xC0,0x3D,0x00,0x0B,0xC0,0x3D,0x00,0x09,0x00},/*"#",3*/$ s, [3 h& m. `4 i. B
- {0x18,0xC0,0x24,0x40,0x7F,0xE0,0x22,0x40,0x31,0x80,0x00,0x00},/*"$",4*/
' Z1 a% S M8 q( e/ M' T - {0x18,0x00,0x24,0xC0,0x1B,0x00,0x0D,0x80,0x32,0x40,0x01,0x80},/*"%",5*/
' o# ?' r: \4 B - {0x03,0x80,0x1C,0x40,0x27,0x40,0x1C,0x80,0x07,0x40,0x00,0x40},/*"&",6*/
5 Z$ X( d* d% U8 |0 q - {0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/1 f( d0 U6 _! u5 p3 c: o
- {0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x80,0x20,0x40,0x40,0x20},/*"(",8*/( b! r8 ~9 F+ i6 X9 Q% B2 c
- {0x00,0x00,0x40,0x20,0x20,0x40,0x1F,0x80,0x00,0x00,0x00,0x00},/*")",9*/
% r+ g/ i: c. @- O - {0x09,0x00,0x06,0x00,0x1F,0x80,0x06,0x00,0x09,0x00,0x00,0x00},/*"*",10*/
; U! s3 O3 j2 x) x6 ` - {0x04,0x00,0x04,0x00,0x3F,0x80,0x04,0x00,0x04,0x00,0x00,0x00},/*"+",11*/
( I: I% v0 y- E. a. T* W - {0x00,0x10,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*",",12*/
+ |) w3 ]. u' R) N - {0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x00,0x00},/*"-",13*/+ F! X. G2 ^# S' i/ C7 I( r
- {0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*".",14*/
; c) P* p4 c+ }& M$ f; A3 \2 N" N% M - {0x00,0x20,0x01,0xC0,0x06,0x00,0x38,0x00,0x40,0x00,0x00,0x00},/*"/",15*/+ C: Y0 Y# z+ \6 \0 T% i: i" |$ _
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"0",16*/1 g& N) b# p( Z* {5 a
- {0x00,0x00,0x10,0x40,0x3F,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"1",17*/
( g8 k) E8 n6 M2 S+ `8 G - {0x18,0xC0,0x21,0x40,0x22,0x40,0x24,0x40,0x18,0x40,0x00,0x00},/*"2",18*/! y& G: \7 \: `' S( C. F& s; r
- {0x10,0x80,0x20,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"3",19*/
& ?% z" q* L4 e% K - {0x02,0x00,0x0D,0x00,0x11,0x00,0x3F,0xC0,0x01,0x40,0x00,0x00},/*"4",20*/
: O& C+ ]* C4 ?0 K. |& h - {0x3C,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x23,0x80,0x00,0x00},/*"5",21*/% {) H7 e# n- p) E9 o" Z
- {0x1F,0x80,0x24,0x40,0x24,0x40,0x34,0x40,0x03,0x80,0x00,0x00},/*"6",22*/
" Q a& J3 ]: X+ L& P( |3 S8 y0 ^" V- w - {0x30,0x00,0x20,0x00,0x27,0xC0,0x38,0x00,0x20,0x00,0x00,0x00},/*"7",23*/2 {: J% Z: _, e
- {0x1B,0x80,0x24,0x40,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"8",24*/
1 m- P* \( A/ Y8 v& u - {0x1C,0x00,0x22,0xC0,0x22,0x40,0x22,0x40,0x1F,0x80,0x00,0x00},/*"9",25*/8 W; O& f% x$ D2 y5 _, X3 z
- {0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00},/*":",26*/* Y6 I4 j: k; f) S
- {0x00,0x00,0x00,0x00,0x04,0x60,0x00,0x00,0x00,0x00,0x00,0x00},/*";",27*/
& z0 g0 r, p" ~3 y( ^ - {0x00,0x00,0x04,0x00,0x0A,0x00,0x11,0x00,0x20,0x80,0x40,0x40},/*"<",28*/
8 Z6 t# Z+ r/ X K, j/ Q9 _ - {0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x09,0x00,0x00,0x00},/*"=",29*/
$ B1 R! w. j l; g( B8 I8 n" g - {0x00,0x00,0x40,0x40,0x20,0x80,0x11,0x00,0x0A,0x00,0x04,0x00},/*">",30*/2 @! p) a$ W% f7 |9 g L- C8 T
- {0x18,0x00,0x20,0x00,0x23,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"?",31*/
' p4 @2 J0 J0 m" O% r( U - {0x1F,0x80,0x20,0x40,0x27,0x40,0x29,0x40,0x1F,0x40,0x00,0x00},/*"@",32*/
) q& B4 q5 ?% K- g% ` - {0x00,0x40,0x07,0xC0,0x39,0x00,0x0F,0x00,0x01,0xC0,0x00,0x40},/*"A",33*/
& Z, Z" X& C" n - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x40,0x1B,0x80,0x00,0x00},/*"B",34*/3 @" `$ _+ I" Y+ S
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x30,0x80,0x00,0x00},/*"C",35*/& g% ~' ~7 c, ~' Q5 e) {
- {0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"D",36*/
}6 V+ E5 m+ X, C - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x40,0x30,0xC0,0x00,0x00},/*"E",37*/. h& ^& H- w, b1 m
- {0x20,0x40,0x3F,0xC0,0x24,0x40,0x2E,0x00,0x30,0x00,0x00,0x00},/*"F",38*/
& K9 Z5 r; E6 v5 r5 D - {0x0F,0x00,0x10,0x80,0x20,0x40,0x22,0x40,0x33,0x80,0x02,0x00},/*"G",39*/
& O9 g% S: E; k8 R" J w7 N - {0x20,0x40,0x3F,0xC0,0x04,0x00,0x04,0x00,0x3F,0xC0,0x20,0x40},/*"H",40*/
t0 n, w% e& k5 D1 C: ^/ @ - {0x20,0x40,0x20,0x40,0x3F,0xC0,0x20,0x40,0x20,0x40,0x00,0x00},/*"I",41*/
) v6 n Y$ D, i; E: Z - {0x00,0x60,0x20,0x20,0x20,0x20,0x3F,0xC0,0x20,0x00,0x20,0x00},/*"J",42*/
& V. t, g, c- K3 B9 } - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x0B,0x00,0x30,0xC0,0x20,0x40},/*"K",43*/
- }. y( k0 i$ E+ h/ \" ]: M - {0x20,0x40,0x3F,0xC0,0x20,0x40,0x00,0x40,0x00,0x40,0x00,0xC0},/*"L",44*/
5 |' V' k1 |3 t/ ^3 a+ z- t; x - {0x3F,0xC0,0x3C,0x00,0x03,0xC0,0x3C,0x00,0x3F,0xC0,0x00,0x00},/*"M",45*/' Q1 Z. F5 l W6 N8 e( _# J
- {0x20,0x40,0x3F,0xC0,0x0C,0x40,0x23,0x00,0x3F,0xC0,0x20,0x00},/*"N",46*/! r7 u$ C3 ^4 l! Z- U
- {0x1F,0x80,0x20,0x40,0x20,0x40,0x20,0x40,0x1F,0x80,0x00,0x00},/*"O",47*/
6 e2 Y; _" O4 u! D - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x24,0x00,0x18,0x00,0x00,0x00},/*"P",48*/
4 D! K' {/ @9 v# { - {0x1F,0x80,0x21,0x40,0x21,0x40,0x20,0xE0,0x1F,0xA0,0x00,0x00},/*"Q",49*/
. T3 K# {" M/ ^$ G7 f - {0x20,0x40,0x3F,0xC0,0x24,0x40,0x26,0x00,0x19,0xC0,0x00,0x40},/*"R",50*/
- C. g1 K# o. U9 B& y" h( K: @ - {0x18,0xC0,0x24,0x40,0x24,0x40,0x22,0x40,0x31,0x80,0x00,0x00},/*"S",51*/; A; |4 D3 g! U9 R. [
- {0x30,0x00,0x20,0x40,0x3F,0xC0,0x20,0x40,0x30,0x00,0x00,0x00},/*"T",52*/
0 \% m5 m, X# l& p* e) A - {0x20,0x00,0x3F,0x80,0x00,0x40,0x00,0x40,0x3F,0x80,0x20,0x00},/*"U",53*/
" B0 `+ Q- e) o1 @- _) F - {0x20,0x00,0x3E,0x00,0x01,0xC0,0x07,0x00,0x38,0x00,0x20,0x00},/*"V",54*/" ~4 _) a) M1 W- a" L" v! C" a
- {0x38,0x00,0x07,0xC0,0x3C,0x00,0x07,0xC0,0x38,0x00,0x00,0x00},/*"W",55*/
9 q" s0 \0 ?! U! u - {0x20,0x40,0x39,0xC0,0x06,0x00,0x39,0xC0,0x20,0x40,0x00,0x00},/*"X",56*/
5 m6 s, t+ H* ?& n - {0x20,0x00,0x38,0x40,0x07,0xC0,0x38,0x40,0x20,0x00,0x00,0x00},/*"Y",57*/
# O1 y9 x1 H6 B! o- p( Q/ |7 u% a - {0x30,0x40,0x21,0xC0,0x26,0x40,0x38,0x40,0x20,0xC0,0x00,0x00},/*"Z",58*/. Y" f; M3 p+ @! L7 I1 g4 w
- {0x00,0x00,0x00,0x00,0x7F,0xE0,0x40,0x20,0x40,0x20,0x00,0x00},/*"[",59*/
' O0 a' O0 R/ h - {0x00,0x00,0x70,0x00,0x0C,0x00,0x03,0x80,0x00,0x40,0x00,0x00},/*"",60*/
: E4 X4 R& w6 Y/ N2 \" X% r9 W - {0x00,0x00,0x40,0x20,0x40,0x20,0x7F,0xE0,0x00,0x00,0x00,0x00},/*"]",61*/9 }' B0 R- p2 ? b5 l+ Y% R
- {0x00,0x00,0x20,0x00,0x40,0x00,0x20,0x00,0x00,0x00,0x00,0x00},/*"^",62*/
/ l- B1 L" z- ]" k0 _ - {0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10},/*"_",63*/
$ u3 V: H, n/ a8 h/ A - {0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/
% `' d+ l$ H! Z5 N4 u3 N) j' v - {0x00,0x00,0x02,0x80,0x05,0x40,0x05,0x40,0x03,0xC0,0x00,0x40},/*"a",65*/' l* s: E7 J- A5 O
- {0x20,0x00,0x3F,0xC0,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"b",66*/
) n5 m9 m4 a# t7 ?1 _6 m - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x06,0x40,0x00,0x00},/*"c",67*/) B$ L7 e$ e6 M& f
- {0x00,0x00,0x03,0x80,0x04,0x40,0x24,0x40,0x3F,0xC0,0x00,0x40},/*"d",68*/, ~4 d) J0 h9 D2 n& ^; z2 D. Q$ }
- {0x00,0x00,0x03,0x80,0x05,0x40,0x05,0x40,0x03,0x40,0x00,0x00},/*"e",69*/
9 S0 f6 x8 i# l# i. o - {0x00,0x00,0x04,0x40,0x1F,0xC0,0x24,0x40,0x24,0x40,0x20,0x00},/*"f",70*/' m# m5 h4 l1 R A' C2 M @5 D! |
- {0x00,0x00,0x02,0xE0,0x05,0x50,0x05,0x50,0x06,0x50,0x04,0x20},/*"g",71*/# F# @! U2 W% ? K% B+ _5 P
- {0x20,0x40,0x3F,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"h",72*/
4 L, c7 ^% a" o4 W1 ~, W - {0x00,0x00,0x04,0x40,0x27,0xC0,0x00,0x40,0x00,0x00,0x00,0x00},/*"i",73*/' U! C1 G( f. n) B
- {0x00,0x10,0x00,0x10,0x04,0x10,0x27,0xE0,0x00,0x00,0x00,0x00},/*"j",74*/4 t( }$ \& C% {3 {2 W, K* r
- {0x20,0x40,0x3F,0xC0,0x01,0x40,0x07,0x00,0x04,0xC0,0x04,0x40},/*"k",75*/
, F5 J+ H; c) c* @8 q - {0x20,0x40,0x20,0x40,0x3F,0xC0,0x00,0x40,0x00,0x40,0x00,0x00},/*"l",76*/" |8 D' b+ Z4 H! C$ I# H1 }% I! d9 ~
- {0x07,0xC0,0x04,0x00,0x07,0xC0,0x04,0x00,0x03,0xC0,0x00,0x00},/*"m",77*/- r# B7 Y- N6 W$ Y. n' c! e
- {0x04,0x40,0x07,0xC0,0x04,0x40,0x04,0x00,0x03,0xC0,0x00,0x40},/*"n",78*/% `" v/ S& G4 Y2 ^
- {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x40,0x03,0x80,0x00,0x00},/*"o",79*/* s9 z" a6 Q# c4 x( }* ^
- {0x04,0x10,0x07,0xF0,0x04,0x50,0x04,0x40,0x03,0x80,0x00,0x00},/*"p",80*/
& _& } g0 i1 ~. O - {0x00,0x00,0x03,0x80,0x04,0x40,0x04,0x50,0x07,0xF0,0x00,0x10},/*"q",81*/
; w# n* c, I: p z - {0x04,0x40,0x07,0xC0,0x02,0x40,0x04,0x00,0x04,0x00,0x00,0x00},/*"r",82*/! r5 _* ~' X* s/ W6 r/ y; c2 N# q
- {0x00,0x00,0x06,0x40,0x05,0x40,0x05,0x40,0x04,0xC0,0x00,0x00},/*"s",83*/5 K5 Q6 c, U! j$ w3 L% _7 A' k4 E! S
- {0x00,0x00,0x04,0x00,0x1F,0x80,0x04,0x40,0x00,0x40,0x00,0x00},/*"t",84*/8 [! W9 K8 R+ ]4 l
- {0x04,0x00,0x07,0x80,0x00,0x40,0x04,0x40,0x07,0xC0,0x00,0x40},/*"u",85*/
7 ~4 V2 e( R m7 T& H% b7 K - {0x04,0x00,0x07,0x00,0x04,0xC0,0x01,0x80,0x06,0x00,0x04,0x00},/*"v",86*/( T) p n! F9 L" v
- {0x06,0x00,0x01,0xC0,0x07,0x00,0x01,0xC0,0x06,0x00,0x00,0x00},/*"w",87*/0 I0 v" A* V6 m3 F
- {0x04,0x40,0x06,0xC0,0x01,0x00,0x06,0xC0,0x04,0x40,0x00,0x00},/*"x",88*/) D7 n/ a2 l8 R2 ?1 Q. T4 E
- {0x04,0x10,0x07,0x10,0x04,0xE0,0x01,0x80,0x06,0x00,0x04,0x00},/*"y",89*/
$ N ?/ r( ?: w( L. S4 b - {0x00,0x00,0x04,0x40,0x05,0xC0,0x06,0x40,0x04,0x40,0x00,0x00},/*"z",90*/
- m% j+ q; ]8 c7 U& e7 ~7 c( k - {0x00,0x00,0x00,0x00,0x04,0x00,0x7B,0xE0,0x40,0x20,0x00,0x00},/*"{",91*/
7 h- H. h8 P4 f* n; V; |* i/ d - {0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xF0,0x00,0x00,0x00,0x00},/*"|",92*/4 R% J8 j% H/ p- V: I9 S
- {0x00,0x00,0x40,0x20,0x7B,0xE0,0x04,0x00,0x00,0x00,0x00,0x00},/*"}",93*/
" j. ^) f! K; j. v - {0x40,0x00,0x80,0x00,0x40,0x00,0x20,0x00,0x20,0x00,0x40,0x00},/*"~",94*/+ I% I. u$ ~3 t5 F& @9 _
- };
) ]% _" y4 n! C9 E% w" |; o
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5.SSD1306基本命令
8 D9 x* c6 Y! ~; g# a- I. U9 h6 `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。' @( |& a" k, m) v
p) h& J9 _. k9 ?& R D3 I) l
2 w @4 E( X4 r- q* I' X
暂停一下!!!捋一下命令与数据的关系:
# P( _. {5 c/ N* ~% x0 X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!
: A `- \5 J6 Z( @
/ H+ a1 K& S: G$ k% T" }( G7 I. D4 e i! R0 h! j3 K8 d0 {% h; H+ w3 V
一些常用的命令如图所示:
" ?- K( j" }' _4 f8 A7 H+ a! X- d# ^0 B/ r6 ?( U: o
" j- H+ k# j! ^% C" j! q
: V0 Z% P- i+ p' b, k
! v3 V1 r& p" w! I0 ~
, k0 H, N2 F L$ |& x2 k- i- X
比较重要的是设置起始坐标的三个命令
, {0 v5 a' L8 V0 C2 B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。
& d3 B" T0 a' V4 D' A命令为 0X00~0X0F,该指令用于设置显示时的起始列地址低四位。: A* q! B: d; j7 ^
命令为 0X10~0X1F,该指令用于设置显示时的起始列地址高四位。
1 s* l) k9 r( C) t/ k8 k, A( B* D
( r* w& [7 ?1 R! I- G6 Y& @- e
& V5 ^: v0 V- `2 |- s2 N0 P有关初始化OLED的所有命令会在下午代码讲解部分列出!9 J9 Q- D7 G& {* G$ Q& ]" l% ?3 \
5 h/ }; z! B3 y5 `+ O
5 Q B/ d, w0 N' e& N三.代码讲解( H! f; r0 O9 P% @+ A* t. y( J
1.相关引脚配置
: y3 v- u v1 i) r4 l9 b# N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: v& l6 k2 [. N* \& B5 E
- /*
0 R3 a# q6 J& V" K0 I6 ] - 配置4线SPI模式的所有引脚
7 V, I' O# P: t+ [$ y - 4线SPI模式只能写,不能读
# I/ S3 S5 H! J6 d3 k, D - SCLK:PC0 D0
U( I( T/ s. o# A P$ }0 o! m4 Y( y - SDIN:PC1 D1" ~6 F @9 S* Y( Q5 `, J6 w+ j
- RES :PG15 拉低时初始化(复位),正常时拉高
8 d5 s1 A# O- z# c - DC :PD3 (0:命令 1:数据)5 I M$ g, U+ f8 L8 K
- CS :PD6
* n9 ?1 u' u" p5 N/ P4 A# ` - */
+ { a; P) D7 f4 e* a - void OLED_GPIO_Config( void )- E5 L4 `$ M* S: A* m5 l
- {. v# M& M5 J' I# k; z: e
- GPIO_InitTypeDef GPIO_InitStruct;
( U) |2 N) N3 h3 d' D( o - 9 G9 i1 T0 d9 K$ {3 e
- RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOG, ENABLE );
: m; h7 H, Y @* f( n3 K1 l -
1 \) O, L9 l- ?0 F% h8 R( v; i; j - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;6 V) m1 G5 V5 i
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
6 ~6 O/ z0 L5 p9 Z3 \ - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;4 A' l+ }9 O' H7 O- @
- GPIO_Init( GPIOC, &GPIO_InitStruct );0 ^ } Q$ e8 @$ S+ j% O! T5 V
-
" C% h! n6 ~! `: L - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;. ?& d- [, @8 v' R7 u- Z5 ]! H
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_6;
# J0 l4 F3 L- \, |3 j - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
' ?' } F' Y! W4 Y - GPIO_Init( GPIOD, &GPIO_InitStruct );% n& D8 T! `: O
- & y/ p, a3 n6 A8 W- r8 |
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
* B! M3 o7 o$ h/ K z8 v - GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;/ D4 c% M" [, d) x" t
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
9 I2 W: q9 f, I* C" [4 }; S - GPIO_Init( GPIOG, &GPIO_InitStruct );9 S0 @ n8 K2 y) Y+ _& M9 ^2 n% T
- }
: K ~8 Y9 y! z5 h; \& z6 _* y; w
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4 T. w! p t6 s J1 W1 D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):
) e) w! x7 n$ D- void OLED_SCLK( uint8_t x )
) ^& ~2 F& r/ v. y - {! V( Y# p Z2 G" a; t
- if( x==1 )
1 i9 e% a6 p' ?. }2 j" J - GPIO_SetBits( GPIOC, GPIO_Pin_0 );/ g! E2 M) n3 R9 M" U5 u
- else
5 t$ j+ F" n% S; b5 V* Y! o - GPIO_ResetBits( GPIOC, GPIO_Pin_0 );
G( f- k: z9 u - }
2 q1 _/ r2 Z/ t; f
, H M* u+ i& R- void OLED_SDIN( uint8_t x )1 b* K! c# n( S, a, N# d
- {
. T/ I4 f5 V$ O" Q! A6 F/ t, q8 x - if( x==0 )
9 | n* G; \% r( t$ x2 Y - GPIO_ResetBits( GPIOC, GPIO_Pin_1 );, d' ~ [0 g) W
- else
- b/ T' k: F$ \9 \, ^, Y3 G( A/ C3 O - GPIO_SetBits( GPIOC, GPIO_Pin_1 );7 E+ h. n" I, l4 {! H
- }( X! c# N3 s, C* u- X9 F; b$ u6 B
/ o+ ~. [! U5 ]" W- void OLED_RES( uint8_t x )
! o& Q1 L: H+ O' U$ S1 k1 @ - {: Q8 |# \" I' ?7 T9 R# d, ^
- if( x==1 )7 F1 k8 [; _' J
- GPIO_SetBits( GPIOG, GPIO_Pin_15 );
% {2 j) E7 M4 N2 ` - else0 ^ x5 z% p4 `2 A
- GPIO_ResetBits( GPIOG, GPIO_Pin_15 );
+ t+ i1 i5 X" l. F, ^: U - }5 @" |) ?1 U8 g' l) [" `( w
- : h) I9 @/ T& d1 b- Q! E% U; M
- void OLED_DC( uint8_t x )2 v1 w: C R( V
- {& \* H V% } G
- if( x==1 )
: Y5 i, J) `) i+ C( b* ~; r& p! o - GPIO_SetBits( GPIOD, GPIO_Pin_3 );
5 t, X* k5 v6 `( r - else
4 ^$ K8 ^7 E ^2 T( K4 x - GPIO_ResetBits( GPIOD, GPIO_Pin_3 );# y2 m4 D/ g; u" r: o
- }5 T9 W7 b3 `" h* \
- , p, `/ E; X2 r- B
- void OLED_CS( uint8_t x )( j, C8 D% l' C K K4 ^
- {
( S+ ]( D+ Z+ I - if( x==1 )
6 E; u; b- |. z: H, G - GPIO_SetBits( GPIOD, GPIO_Pin_6 );8 P4 k/ y4 P- `
- else% `$ {3 |+ D1 ^( r
- GPIO_ResetBits( GPIOD, GPIO_Pin_6 );
+ k7 U! M1 h5 T' L' y. Z# _. Q" W - }, q# I! w4 y( T7 X
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& A0 q! {1 K3 {6 `: g# N3 p8 {1 m2.模拟SPI通信
; [& @% D6 R- D1 Q, ^9 @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:5 |/ p9 h" C8 H1 g2 Q2 d7 P
- $ q) j3 }4 p" ]: w- \2 u. L: W7 s i
- /* 写一个命令 高位先行 */
9 g( \. s4 E0 w5 H - void OLED_WR_Cmd( uint8_t cmd )
2 \' u- P- m' ^2 A( j* _" A8 w - {2 ?/ y! ^! u! T( [5 G4 |+ s, I- ~
- uint8_t i,k;" d$ \7 C6 Z7 b9 }! N4 W% _4 _3 ]
- /* 拉低片选CS,写命令拉低DC */
) x' s6 L4 G9 @" [# c# B - OLED_CS(0);
# Z& b0 N7 _6 G$ s. d* _4 U - OLED_DC(0);
" H, C' A% g( I4 a/ A k7 k -
5 z! p; a) {, ]+ Y! g* b - for( i=0;i<8;i++ )
7 Q$ e% Z% ]/ A' n& p - {3 _8 ~1 i# H" ?2 y
- /* 时钟线,上升沿有效 */7 k8 i1 c. I( ~: d# x
- OLED_SCLK(0);
2 w, w# {* D$ M& J- C% N" O, A2 J - k=cmd&(0x80);
1 D. b2 ` \* r- x5 i/ Q6 U1 b - OLED_SDIN(k);
; U$ ^ h6 W6 l - OLED_SCLK(1);
3 d/ ]1 ?5 m6 t. x: A J9 s - cmd<<=1;! Z' N3 h/ R; N$ ?9 K
- }
) |( Q+ z" K o$ n: m8 G* L - OLED_CS(1);( U% ?) n! E9 e5 G7 n M; e) a
- OLED_DC(1); 3 j2 R# m( ?! `! _+ ~/ u
- }
5 B, f+ N( u4 `3 b( K+ T - . f T! |6 u' Y3 m
- $ d& {7 j% i) ~7 q+ E) {2 k
- /* 写一个数据 高位先行 */
; i" F) i9 b# N3 P - void OLED_WR_Data( uint8_t data ) K' {4 w4 j( s) l5 l
- {, b6 i9 r7 V1 e c8 c O
- uint8_t i,k;8 A/ m0 {: a+ a4 J; U+ w h
- /* 拉低片选CS,写数据拉高DC */
: @8 @% u# @) z! D4 E - OLED_CS(0);; O2 T8 Y) l8 B/ z: i
- OLED_DC(1);
: h. N8 a. y! ]" D4 C$ i - 8 U2 C2 P) t t$ ^2 h
- for( i=0;i<8;i++ ) z0 P; E% ~, _1 \8 W4 F+ q6 [
- {: E# x( Y- h7 \ T4 p/ y
- /* 时钟线,上升沿有效 */
( m* F3 @# m4 @) c _ - OLED_SCLK(0);4 l5 \, U$ ?8 ]8 h* ]7 ]5 J. @
- k=data&(0x80);& D' U8 E. a" F4 M% D( I; g
- OLED_SDIN(k);4 h) v: F3 o" Y2 r% ^% q
- OLED_SCLK(1);
9 H& w2 ^3 ]* X+ f4 c - data<<=1;
`6 C) f. }3 q! x, U - }
3 j p: Y' A9 x; @3 {1 G - OLED_CS(1);
1 C2 L; R& b+ a - OLED_DC(1);
) L3 x5 g# u2 U* }0 K - }
" b& h& P7 I' x
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. H8 M# Q/ f# G0 i4 x+ S5 k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( v1 ^, F. ?6 K
* @ u# \9 e* g1 ~, u- X; T" o3.OLED初始化函数$ D# q* G7 s9 x0 c& O3 V- k
前面说了,会有一堆初始化命令:: z: }& r9 S# K: l) W; ~* M
0 [% A' R0 C. d: F! ]2 v# R) f- /* OLED初始化函数 */
# `' ^8 f# E& K8 F1 Y; t( E( ?5 s# W - void OLED_Init( void )
) u: V" X* }; U1 b. _+ w; O, S - {; `- Z) G. U" @% z
- /* 引脚初始化 *// u) T H) ~7 y
- OLED_GPIO_Config();
( x; k/ n6 }8 j -
2 R: |9 X5 e7 }' y8 R! j. r - OLED_CS(1);* _' y& {5 ~3 {( P7 C9 U' o
- OLED_DC(1);& l% R# f$ A- @
-
0 S5 f& O5 S4 D - /* 复位 */+ N. d! T/ N% Y: V4 r, u
- OLED_RES(0);: S& O3 N( ~: G) `$ A O
- Delay_ms(1000);- L6 }) {! C9 Q* j
- OLED_RES(1);+ a$ g' ]6 j5 E% O7 n
-
+ y% j* z& I% b - /* 开始写入初始化命令 */
+ B; t3 e x& ~1 S. _) V - OLED_WR_Cmd(0xAE);//关闭显示
) m2 j" U6 i; _; r; F* q - OLED_WR_Cmd(0xD5);//设置时钟分频因子
3 ~0 X0 B% q6 \/ ^ - OLED_WR_Cmd(80);0 S+ e' L7 V$ J3 W, _9 v
-
4 s4 c2 L8 Y4 t* L - OLED_WR_Cmd(0xA8);//设置驱动路数
% D7 h8 m$ `, |! y$ B; ]8 Z! C - OLED_WR_Cmd(0x3F);//路数默认0x3F(1/64)
- f7 m6 i2 H. t, D -
5 L2 F E$ h- ]7 R- W5 l8 R - OLED_WR_Cmd(0xD3);//设置显示偏移
! ?# h( Q: A" o3 C& D; x - OLED_WR_Cmd(0x00);//偏移默认为0: w; ]) X0 `4 K! \
-
% C0 T! Y( e7 T/ c, e - OLED_WR_Cmd(0x40);//设置显示开始行[5:0]
1 d; `& z/ j9 G F# @6 R+ a: d$ W3 M - 6 t; M# _. k& S& x& U: K
- OLED_WR_Cmd(0x8D);//电荷泵设置$ Q/ q% \! V% a; \9 P
- OLED_WR_Cmd(0x14);//bit2,开启/关闭9 [! S E. V0 ~" M
- 5 w; k. f: A% f8 I7 P
- OLED_WR_Cmd(0x20);//设置内存地址模式
/ N3 c4 d5 \5 j6 n' F' y2 B% B - 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;
9 s: O- ^% m5 @ -
4 x8 f. ?) N# F$ h - OLED_WR_Cmd(0xA1);//段重定义设置,bit0:0,0->0;1,0->127;
: y4 v5 h5 A4 i - 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 R1 p. J0 G; z) D
- OLED_WR_Cmd(0xDA);//设置COM硬件引脚配置
$ O: W/ |1 L8 N9 ?6 ~) {. _ - OLED_WR_Cmd(0x12);//[5:4]配置
0 N9 ~4 C& A, ] - 0 {- `6 g1 z& J+ @+ j% g
- OLED_WR_Cmd(0x81);//对比度设置
# ~) j1 I+ u% u7 L9 f9 i/ z' |, O - OLED_WR_Cmd(0xEF);//默认0x7F(范围1~255,越大越亮)) y. V5 X* V7 j. @4 z- C
- ! k j: V" {* T3 T! P& g4 K: H
- OLED_WR_Cmd(0xD9);//设置预充电周期
2 S& H8 y3 x2 w8 V' ~ - OLED_WR_Cmd(0xF1);//[3:0],PHASE 1;[7:4],PHASE 2;8 _- S3 G6 S' p7 E( W+ N9 e
-
m2 b: c# P+ |/ S& L - OLED_WR_Cmd(0xDB);//设置VCOMH 电压倍率4 {5 E* a( C3 J4 Y1 h7 v. J& P7 r
- OLED_WR_Cmd(0x30);//[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;
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7 }9 _7 B0 i X, W# E1 u - OLED_WR_Cmd(0xA4);//全局显示开启;bit0:1,开启;0,关闭;(白屏/黑屏)
, [8 h5 x$ W5 a" R - OLED_WR_Cmd(0xA6);//设置显示方式;bit0:1,反相显示;0,正常显示) E/ l& H8 D3 g( e% Q
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- OLED_WR_Cmd(0xAF);//开启显示
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- /* 清屏函数 */$ R, P% _. F: U$ U4 M
- OLED_Clear();( l% p( S4 R7 z
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1 p) g& w3 N0 ]. _+ c8 Z0 u3 J啥也不说了,照着写就完事了!
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, q' ]/ W7 T9 b7 P, j# R4.图像刷新与清屏函数: B1 ?' q, J5 b9 O: b
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:3 z; t: I! @3 j, ~ D C: B
- /* 图像刷新函数 */
9 m' Y1 l) N* a A" I - void OLED_Refresh_GRAM( void ). \0 l! C+ c2 ~0 G- A5 L
- {
9 k' T3 O7 g" e" f - uint8_t i,j;3 t- s h' z- v2 P1 }
- for( i=0;i<8;i++ )4 b8 P! e# ~& w# Y6 [
- {
' ~ h. W q3 `8 z4 j' x( z - /* 设置显示的起始地址 */1 V& m. B# X: K5 n) n
- OLED_WR_Cmd(0xB0+i);//设置页地址(行)
* C' A, V; W0 o0 Z5 O# B - OLED_WR_Cmd(0x00);//设置列地址的低四位, \$ v h; L2 a W% m( K9 o- b
- OLED_WR_Cmd(0x10);//设置列地址的高四位2 ^ \2 {6 V ` W6 c
- for( j=0;j<128;j++ )
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1 ]2 m/ U$ D( x G; Z# u - OLED_WR_Data(OLED_GRAM[j][i]);//将GRAM中图像信息写入屏幕
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/ e( |1 f! o0 C, t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:; _* W3 W: `- U9 P6 d- M& u
- * 清屏函数 */
, X& o3 W& i1 L2 j' I3 V; y( p( p - void OLED_Clear( void )
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- uint8_t i,j;
# h: {3 I( _7 y+ V- k* w2 {) i - for( i=0;i<8;i++ )" `% |8 U; G! p" C
- for( j=0;j<128;j++ )' k6 }- R; a8 w' M% s( ^2 V( U. Z
- OLED_GRAM[j][i]=0x00;% S' ~; y# ? P& P# i
- OLED_Refresh_GRAM();
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q$ T7 C% d a5 c5.画点函数. Y% j5 c2 u) e* J# ?8 _- e, M
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:0 L% s& U i5 l: O) i+ D o) x
- //OLED_GRAM[128][8]. g* R7 R. Y+ S) O1 ~- T
- /* 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
8 c& O! ]) W. i8 A - (x,y)坐标换算:OLED_GRAM[x][7-y/8]|=1<<(7-y%8);
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- mode取1正显,取0反显9 e1 {2 p/ Q7 G' P5 U
- *// g% n. V- A% M6 k0 r
- void OLED_DrawPoint( uint8_t x,uint8_t y,uint8_t mode )* @) ^- N9 b- E( a% s3 Y
- {' H, E, [: \$ z: B
- /* 主要是求出y坐标,根据y坐标来位运算OLED_GRAM中相应的位 */# o3 {, {! ?2 L8 c+ _0 @0 Q# ^
- uint8_t i,j,temp;# F+ z" X& \4 e! `1 ^. e
- /* 判断坐标是否超出范围 */2 B g N5 m+ |( j; q
- if(x>127||y>63)return; M0 K3 G* k, G8 j. {9 Q: C0 |
-
2 ~2 E0 m8 b2 k% [ - i=7-y/8;//算出第几页" H! J1 y. [8 n3 u; m
- j=y%8;
0 m, P! i, F. h- E: \# P) l; H - temp=0x01<<(7-j);//由位运算精确找出坐标像素点5 \; l' y1 W: k% Y# f
- if(mode==0)5 L$ ]* @, |# L- i' A
- OLED_GRAM[x][i]&=~temp;3 Y. `7 S0 H x- d
- else6 L+ X: \/ T5 _% K+ `
- OLED_GRAM[x][i]|=temp;
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$ Y/ o( `7 \$ Y! ?6.显示字符函数
6 c# z8 F0 O% f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:
: m' v( W# i+ |0 v5 m+ [& z0 A- /* 在(x,y)坐标正显/反显指定大小字符chr7 W2 Y* W, F/ p, L
- mode:0是反显,1是正常显示! o/ c7 s) W: W7 Q5 [! B
- size:12/16/24+ c- b9 F. C/ c7 M
- ASCII字符集: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ a$ k; B& d' B# C0 [$ U& i- u
- */) G8 C f9 O+ E4 B# i p! y ~' X
- void OLED_Show_Char( uint8_t x,uint8_t y,uint8_t chr,uint8_t size,uint8_t mode )
# Q3 Q5 v* j0 } - {
" o" P8 E! _- T( A$ w - /* temp是当前对应的一个字节的点集,y0是初始坐标 */
- R* @0 q* C, I- v - uint8_t temp,t,t1;
0 G* a9 j* b% S" K Z) u - uint8_t y0=y;
8 i8 _4 @) b2 o! g0 {0 f9 v, c1 L - /* csize是单个字符所占字节的多少 */, R7 U- d+ c" b( A# s. E1 h
- uint8_t csize=(size/8+((size%8)?1:0))*(size/2);
% j, ^! F; t8 f" q - /* 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) */
9 x5 M# w f8 ]. Q - /* chr会锁定字符在字库中的的序号 */
1 Z& M. Z9 E2 n - chr=chr-' ';
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0 S9 S& p! C1 S( N( z6 _# _ - /* 相应字符点集有多少个字节 */- I4 [3 u; l$ c5 ^ |
- for( t=0;t<csize;t++ )6 \' K6 H" }; S" L c. F% b) F
- {
9 b& P2 ]) U; X* }5 c: f5 l - /* 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 */
9 l: O, r( ~, T7 a0 W! A, r - switch( size )
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L) L' }/ }2 P) m* L - case 12:temp=asc2_1206[chr][t];break;//12x6(行x列)8 }( s* y3 p$ \7 H. Q
- case 16:temp=asc2_1608[chr][t];break;//16x8
" I; |' D$ E" t& I% _3 X - case 24:temp=asc2_2412[chr][t];break;//24x129 I( a' f* e5 R! f
- default:return;//没有相应字库! b! i6 Z0 M' K/ o
- }
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- /* 画出每一列的点 */% C: e# A( @3 y6 c7 j4 o. t
- for( t1=0;t1<8;t1++ )
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$ ~# R$ y s1 \9 Y! E0 Q - if( temp&0x80 )# i" S4 z$ `' y6 @
- OLED_DrawPoint( x,y,mode );+ Q2 _6 G5 t8 b+ `& I
- else
, g# ~" N& b) w" f% { - OLED_DrawPoint( x,y,!mode );
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; R9 Q! \" O2 l - temp<<=1;
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-
- o2 l5 }$ |( `+ h - /* 根据给出每一列的像素点的多少,判断列是否满:7 k' g0 Q' ?( \# a5 f' l) h
- 满了就换列,不满继续在此列画点 (与字库画点原理相关) 9 L0 S2 D& w; ~* A
- */
0 e# ?% G' ^0 W) Z5 u% T$ V - if( ( y-y0 )==size )
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- y=y0;% @. B& I0 s1 o. D m
- x++;
0 S0 q6 J: u% ~$ ~5 T - /* 一列满,跳出循环,直接转到下一个字节点集的打印 */
/ G6 ~& Q( y6 V6 A1 n7 } - break; N( G8 J/ P- f2 _$ V$ o5 R- [
- }
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- }
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7.显示字符串函数
' o6 Z1 h1 M# t2 @& I4 q2 m/ X: L) M显示字符串,就是显示字符的加强版:& u+ s; r- ~6 D0 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 */
1 k0 U$ ~" B0 B/ u9 G - void OLED_Show_String( uint8_t x, uint8_t y, const uint8_t *p, uint8_t size, uint8_t mode )
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- /* 判断是否合法字符,同时也限定了范围 */
0 _7 M5 c l7 I) T$ r* u9 ~9 j/ ~4 t$ O: N- P - while( (*p<='~')&&(*p>=' ') )* z- z- r9 Y5 u3 }2 X
- {+ r6 W# P9 d. L
- /* 如果初始行放不下,移动到下一行 */
$ m+ ~1 o" J3 o' `/ O1 ?. y) ] - if( x>(128-(size/2)) ) Q$ Y. E6 z9 v) C* x: s# e
- {
1 k1 L \* A% w& `! J$ ? - x=0;1 Y% ?- a+ X! s
- y=y+size;9 L$ Z' ?3 R3 n
- }1 ?% O6 T" A5 D s5 W; _: E
- if( y>(64-size) )
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' p% n+ A6 q4 ^( g" m2 H$ a+ c - x=y=0;6 [* X: V# ~8 J* o* o% E
- OLED_Clear();
; J0 q8 j0 t# c6 a8 U+ t - }8 V9 I# s! [7 n+ b! I
-
% Q- r, R! A1 \ - OLED_Show_Char( x,y,*p,size,mode );
, m( U- ~, p) v+ b* P/ @+ I( G - /* 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 L% N# ^+ M( F
- x=x+size/2;; @* c! \ e. {' {' ^" q
- p++;$ C% L( [; } Z
- }0 Z8 N8 Y9 W4 X2 i5 r
- }
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8.显示特殊图像
4 F1 m% z0 D" s" s+ e T" m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!* {2 R T4 r* P6 z' ?4 _8 ^0 W) r
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- p/ H1 E" |* E0 q* H版权声明:Aspirant-GQ. c& N. S6 S) |, X( h& t! \. p3 n! ^
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