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»论坛 › 嵌入式/单片机论坛 › 24小时必答区 › ssd1306iic驱动LCD12832怎么改屏幕亮度或对比度?
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ssd1306iic驱动LCD12832怎么改屏幕亮度或对比度?

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ID:283883 发表于 2022-3-1 11:58 | 显示全部楼层 |阅读模式
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>

  3. // OLED I2C 128 x 32 monochrome display **********************************************

  5. const int OLEDAddress = 0x3C;

  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. };

  27. const int data = 0x40;
  28. const int single = 0x80;
  29. const int command = 0x00;

  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. }

  38. void DisplayOnOff (int On) {
  39.   Wire.beginTransmission(OLEDAddress);
  40.   Wire.write(command);
  41.   Wire.write(0xAE + On);
  42.   Wire.endTransmission();
  43. }

  45. // Graphics **********************************************

  47. int Scale = 2;
  48. boolean Smooth = true;

  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. };

  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. }

  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. }

  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. }

  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. }

  172. // Real-Time Clock **********************************************

  174. volatile uint16_t MSByte;
  175. volatile uint32_t Counter;

  177. void RTCSetup () {
  178.   uint8_t temp;
  179.   // Initialize 32.768kHz Oscillator:

  181.   // Disable oscillator:
  182.   temp = CLKCTRL.XOSC32KCTRLA & ~CLKCTRL_ENABLE_bm;

  184.   // Enable writing to protected register
  185.   CPU_CCP = CCP_IOREG_gc;
  186.   CLKCTRL.XOSC32KCTRLA = temp;

  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. }

  210. // Timer/Counter TCD0 **********************************************

  212. volatile boolean Ready = false;                     // New reading ready?

  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

  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. }

  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. }

  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. }

  246. // Event System **********************************************

  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. }

  258. // Setup **********************************************

  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. }

  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

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ID:401564 发表于 2022-3-1 17:06 | 显示全部楼层
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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