标题: ssd1306iic驱动LCD12832怎么改屏幕亮度或对比度? [打印本页]

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作者: zxule    时间: 2022-3-1 11:58
标题: ssd1306iic驱动LCD12832怎么改屏幕亮度或对比度?
同题，研究了数据手册，看到是通过0x81改对比度，就是想请教坛友们这句话应该怎么写，加在程序的哪里?谢谢！程序如下，数据手册在附件。谢谢！

1. #include <Wire.h>
   
2. 
   
3. // OLED I2C 128 x 32 monochrome display **********************************************
   
4. 
   
5. const int OLEDAddress = 0x3C;
   
6. 
   
7. // Initialisation sequence for OLED module
   
8. int const InitLen = 15;
   
9. const unsigned char Init[InitLen] PROGMEM = {
   
10.   0xA8, // Set multiplex
    
11.   0x1F, // for 32 rows
    
12.   0x8D, // Charge pump
    
13.   0x14,
    
14.   0x20, // Memory mode
    
15.   0x01, // Vertical addressing
    
16.   0xA1, // 0xA0/0xA1 flip horizontally
    
17.   0xC8, // 0xC0/0xC8 flip vertically
    
18.   0xDA, // Set comp ins
    
19.   0x02,
    
20.   0xD9, // Set pre charge
    
21.   0xF1,
    
22.   0xDB, // Set vcom deselect
    
23.   0x40,
    
24.   0xAF  // Display on
    
25. };
    
26. 
    
27. const int data = 0x40;
    
28. const int single = 0x80;
    
29. const int command = 0x00;
    
30. 
    
31. void InitDisplay () {
    
32.   Wire.beginTransmission(OLEDAddress);
    
33.   Wire.write(command);
    
34.   for (uint8_t c=0; c<InitLen; c++) Wire.write(pgm_read_byte(&Init[c]));
    
35.   Wire.endTransmission();
    
36. }
    
37. 
    
38. void DisplayOnOff (int On) {
    
39.   Wire.beginTransmission(OLEDAddress);
    
40.   Wire.write(command);
    
41.   Wire.write(0xAE + On);
    
42.   Wire.endTransmission();
    
43. }
    
44. 
    
45. // Graphics **********************************************
    
46. 
    
47. int Scale = 2;
    
48. boolean Smooth = true;
    
49. 
    
50. // Character set for ASCII space up to '9'
    
51. const uint8_t CharMap[][6] PROGMEM = {
    
52. { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
    
53. { 0x00, 0x00, 0x5F, 0x00, 0x00, 0x00 },
    
54. { 0x00, 0x07, 0x00, 0x07, 0x00, 0x00 },
    
55. { 0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00 },
    
56. { 0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00 },
    
57. { 0x23, 0x13, 0x08, 0x64, 0x62, 0x00 },
    
58. { 0x36, 0x49, 0x56, 0x20, 0x50, 0x00 },
    
59. { 0x00, 0x08, 0x07, 0x03, 0x00, 0x00 },
    
60. { 0x00, 0x1C, 0x22, 0x41, 0x00, 0x00 },
    
61. { 0x00, 0x41, 0x22, 0x1C, 0x00, 0x00 },
    
62. { 0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x00 },
    
63. { 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00 },
    
64. { 0x00, 0x80, 0x70, 0x30, 0x00, 0x00 },
    
65. { 0x08, 0x08, 0x08, 0x08, 0x08, 0x00 },
    
66. { 0x00, 0x00, 0x60, 0x60, 0x00, 0x00 },
    
67. { 0x20, 0x10, 0x08, 0x04, 0x02, 0x00 },
    
68. { 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00 },
    
69. { 0x00, 0x42, 0x7F, 0x40, 0x00, 0x00 },
    
70. { 0x72, 0x49, 0x49, 0x49, 0x46, 0x00 },
    
71. { 0x21, 0x41, 0x49, 0x4D, 0x33, 0x00 },
    
72. { 0x18, 0x14, 0x12, 0x7F, 0x10, 0x00 },
    
73. { 0x27, 0x45, 0x45, 0x45, 0x39, 0x00 },
    
74. { 0x3C, 0x4A, 0x49, 0x49, 0x31, 0x00 },
    
75. { 0x41, 0x21, 0x11, 0x09, 0x07, 0x00 },
    
76. { 0x36, 0x49, 0x49, 0x49, 0x36, 0x00 },
    
77. { 0x46, 0x49, 0x49, 0x29, 0x1E, 0x00 },
    
78. };
    
79. 
    
80. void ClearDisplay () {
    
81.   Wire.beginTransmission(OLEDAddress);
    
82.   Wire.write(command);
    
83.   // Set column address range
    
84.   Wire.write(0x21); Wire.write(0); Wire.write(127);
    
85.   // Set page address range
    
86.   Wire.write(0x22); Wire.write(0); Wire.write(3);
    
87.   Wire.endTransmission();
    
88.   // Write the data in 37 14-byte transmissions - buffer only 16 bytes
    
89.   for (int i = 0 ; i < 37; i++) {
    
90.     Wire.beginTransmission(OLEDAddress);
    
91.     Wire.write(data);
    
92.     for (int i = 0 ; i < 14; i++) Wire.write(0);
    
93.     Wire.endTransmission();
    
94.   }
    
95. }
    
96. 
    
97. // Converts bit pattern abcdefgh into aabbccddeeffgghh
    
98. int Stretch (int x) {
    
99.   x = (x & 0xF0)<<4 | (x & 0x0F);
    
100.   x = (x<<2 | x) & 0x3333;
     
101.   x = (x<<1 | x) & 0x5555;
     
102.   return x | x<<1;
     
103. }
     
104. 
     
105. // Plots a character; line = 0 to 3; column = 0 to 131
     
106. // Redesigned to cope with 16 byte I2C buffer
     
107. void PlotChar(int c, int line, int column) {
     
108.   Wire.beginTransmission(OLEDAddress);
     
109.   Wire.write(command);
     
110.   // Set column address range
     
111.   Wire.write(0x21); Wire.write(column); Wire.write(column + Scale*6 - 1);
     
112.   // Set page address range
     
113.   Wire.write(0x22); Wire.write(line); Wire.write(line + Scale - 1);
     
114.   Wire.endTransmission();
     
115.   uint8_t col0 = pgm_read_byte(&CharMap[c-32][0]);
     
116.   int col0L, col0R, col1L, col1R;
     
117.   col0L = Stretch(col0);
     
118.   col0R = col0L;
     
119.   for (uint8_t col = 1 ; col < 5; col++) {
     
120.     Wire.beginTransmission(OLEDAddress);
     
121.     Wire.write(data);
     
122.     uint8_t col1 = pgm_read_byte(&CharMap[c-32][col]);
     
123.     col1L = Stretch(col1);
     
124.     col1R = col1L;
     
125.     if (Scale == 1) Wire.write(col0);
     
126.     // Smoothing
     
127.     else {
     
128.       if (Smooth) {
     
129.         for (int i=6; i>=0; i--) {
     
130.           for (int j=1; j<3; j++) {
     
131.             if (((col0>>i & 0b11) == (3-j)) && ((col1>>i & 0b11) == j)) {
     
132.               col0R = col0R | 1<<((i*2)+j);
     
133.               col1L = col1L | 1<<((i*2)+3-j);
     
134.             }
     
135.           }
     
136.         }
     
137.       }
     
138.       Wire.write(col0L); Wire.write(col0L>>8);
     
139.       Wire.write(col0R); Wire.write(col0R>>8);
     
140.       col0L = col1L; col0R = col1R;
     
141.     }
     
142.     col0 = col1;
     
143.     Wire.endTransmission();
     
144.   }
     
145.   Wire.beginTransmission(OLEDAddress);
     
146.   Wire.write(data);
     
147.   if (Scale == 1) Wire.write(col0);
     
148.   else {
     
149.     Wire.write(col0L); Wire.write(col0L>>8);
     
150.     Wire.write(col0R); Wire.write(col0R>>8);
     
151.   }
     
152.   Wire.endTransmission();
     
153. }
     
154. 
     
155. // Plot a 9-digit integer
     
156. void PlotInt (uint32_t value, int line, int column) {
     
157.   boolean suppress = true;
     
158.   for (uint32_t d=100000000; d>0; d = d/10) {
     
159.     if (d == 100000 || d == 100) {
     
160.       PlotChar((suppress ? ' ' : ','), line, column);
     
161.       column = column + Scale*5;
     
162.     }
     
163.     char c = value/d % 10 +'0';
     
164.     if (value == 0 && d<=100) c = '-';               // Zero shown as "---"
     
165.     else if (c == '0' && suppress && d != 1) c = ' ';
     
166.     else suppress = false;
     
167.     PlotChar(c, line, column);
     
168.     column = column + Scale*6;
     
169.   }
     
170. }
     
171. 
     
172. // Real-Time Clock **********************************************
     
173. 
     
174. volatile uint16_t MSByte;
     
175. volatile uint32_t Counter;
     
176. 
     
177. void RTCSetup () {
     
178.   uint8_t temp;
     
179.   // Initialize 32.768kHz Oscillator:
     
180. 
     
181.   // Disable oscillator:
     
182.   temp = CLKCTRL.XOSC32KCTRLA & ~CLKCTRL_ENABLE_bm;
     
183. 
     
184.   // Enable writing to protected register
     
185.   CPU_CCP = CCP_IOREG_gc;
     
186.   CLKCTRL.XOSC32KCTRLA = temp;
     
187. 
     
188.   while (CLKCTRL.MCLKSTATUS & CLKCTRL_XOSC32KS_bm); // Wait until XOSC32KS is 0
     
189.   
     
190.   temp = CLKCTRL.XOSC32KCTRLA & ~CLKCTRL_SEL_bm;    // Use External Crystal
     
191.   
     
192.   // Enable writing to protected register
     
193.   CPU_CCP = CCP_IOREG_gc;
     
194.   CLKCTRL.XOSC32KCTRLA = temp;
     
195.   
     
196.   temp = CLKCTRL.XOSC32KCTRLA | CLKCTRL_ENABLE_bm;  // Enable oscillator
     
197.   
     
198.   // Enable writing to protected register
     
199.   CPU_CCP = CCP_IOREG_gc;
     
200.   CLKCTRL.XOSC32KCTRLA = temp;
     
201.   
     
202.   // Initialize RTC
     
203.   while (RTC.STATUS > 0);                           // Wait until registers synchronized
     
204.   
     
205.   RTC.PER = 1023;                                   // Set period 1 second
     
206.   RTC.CLKSEL = RTC_CLKSEL_TOSC32K_gc;               // 32.768kHz External Crystal Oscillator  
     
207.   RTC.CTRLA = RTC_PRESCALER_DIV32_gc | RTC_RTCEN_bm;// Prescaler /32 and enable
     
208. }
     
209. 
     
210. // Timer/Counter TCD0 **********************************************
     
211. 
     
212. volatile boolean Ready = false;                     // New reading ready?
     
213. 
     
214. void TCDSetup () {
     
215.   TCD0.CTRLB = TCD_WGMODE_ONERAMP_gc;               // Set one ramp waveform mode
     
216.   TCD0.CMPBCLR = 0xFFF;                             // Count up to maximum
     
217.   TCD0.INPUTCTRLB = TCD_INPUTMODE_EDGETRIG_gc;      // Capture and reset counter
     
218.   TCD0.EVCTRLB = TCD_CFG_ASYNC_gc | TCD_ACTION_bm | TCD_TRIGEI_bm; // Enable event
     
219.   TCD0.INTCTRL = TCD_OVF_bm | TCD_TRIGB_bm;         // Enable interrupts
     
220. 
     
221.   // Ensure ENRDY bit is set
     
222.   while(!(TCD0.STATUS & TCD_ENRDY_bm));
     
223.   
     
224.   // External clock, no prescaler, enable timer
     
225.   TCD0.CTRLA = TCD_CLKSEL_EXTCLK_gc | TCD_CNTPRES_DIV1_gc | TCD_ENABLE_bm;
     
226. }
     
227. 
     
228. // Timer/Counter TCD0 overflow interrupt counts MSByte
     
229. ISR (TCD0_OVF_vect) {
     
230.   TCD0.INTFLAGS = TCD_OVF_bm;                       // Clear overflow interrupt flag
     
231.   MSByte++;
     
232. }
     
233. 
     
234. // Timer/Counter TCD0 capture interrupt
     
235. ISR (TCD0_TRIG_vect) {
     
236.   PORTA.IN = PIN4_bm;                               // Toggle LED on
     
237.   TCD0.INTFLAGS = TCD_TRIGB_bm;                     // Clear capture interrupt flag
     
238.   Counter = TCD0.CAPTUREB;
     
239.   Counter = (uint32_t)MSByte<<12 | Counter;
     
240.   MSByte = 0;
     
241.   Ready = true;
     
242.   PORTA.IN = PIN4_bm;                               // Toggle LED off
     
243.   TCD0.INTFLAGS = TCD_OVF_bm;                       // Clear overflow interrupt flag
     
244. }
     
245. 
     
246. // Event System **********************************************
     
247. 
     
248. void EvsysSetup (void) {
     
249.   EVSYS.ASYNCCH1 = EVSYS_ASYNCCH1_RTC_OVF_gc;       // Event generated from RTC OVF
     
250.   EVSYS.ASYNCUSER7 = EVSYS_ASYNCUSER7_ASYNCCH1_gc;  // Event causes a TCD0 capture
     
251.   
     
252.   EVSYS.ASYNCCH0 = EVSYS_ASYNCCH0_PORTA_PIN1_gc;    // PA1 is an event generator
     
253.   EVSYS.ASYNCUSER8 = EVSYS_ASYNCUSER8_ASYNCCH0_gc;  // ASYNCUSER8 is EVOUT0 (PA2)
     
254.   PORTMUX.CTRLA = PORTMUX_EVOUT0_bm;                // Enable EVOUT0
     
255.   PORTA.PIN1CTRL = PORT_INVEN_bm;                   // Invert input
     
256. }
     
257. 
     
258. // Setup **********************************************
     
259. 
     
260. void setup() {
     
261.   PORTA.DIRSET = PIN4_bm;                           // Make LED on PA4 an output
     
262.   PORTA.PIN4CTRL = PORT_INVEN_bm;                   // Invert output
     
263.   Wire.begin();
     
264.   InitDisplay();
     
265.   ClearDisplay();
     
266.   TCDSetup();
     
267.   RTCSetup();
     
268.   EvsysSetup();
     
269. }
     
270. 
     
271. void loop() {
     
272.   uint32_t temp;
     
273.   unsigned long start = millis();
     
274.   while (!Ready) {
     
275.     if (millis() - start > 1000) {
     
276.       Counter = 0;
     
277.       break;
     
278.     }
     
279.   }
     
280.   Ready = false;
     
281.   cli(); temp = Counter; sei();
     
282.   PlotInt(temp, 1, 0);
     
283. }

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0.91 UN-2832TSWEG02.pdf

2022-3-1 11:57 上传

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数据手册

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作者: Y_G_G    时间: 2022-3-1 17:06
这是一个双字节命令,你要先写入0x81,再写入(对比度:0-ff)指令格式是命令格式(0x00)

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