Pixel by pixel scrolling

Inc/ssd1306.h

@@ -2,18 +2,6 @@
 #include "stm32f4xx_hal.h"
 #include "fonts.h"
 
-//	Deze library is door Olivier Van den Eede 2016 geschreven en aangepast voor gebruik met
-//	Stm32 microcontrollers en maakt gebruik van de HAL-i2c library's.
-//
-//	Deze library is gemaakt om gebruik te kunnen maken van een ssd1306 gestuurd oled display.
-//	Voor het gebruik moeten zeker de onderstaande defines juist ingesteld worden.
-//	Zoals de gebruikte i2c poort en de groote van het scherm.
-//
-//	De library maakt gebruik van 2 files (fonts.c/h) Hierin staan 3 fonts beschreven.
-//	Deze fonts kunnen zo gebruikt worden: 	- Font_7x10
-//											- Font_11x18
-//											- Font_16x26
-
 #ifndef ssd1306
 #define ssd1306
 
@@ -26,6 +14,40 @@
 // SSD1306 LCD height in pixels
 #define SSD1306_HEIGHT          64
 
+#define SSD1306_EXTERNALVCC 0x1
+#define SSD1306_SWITCHCAPVCC 0x2
+#define SSD1306_SETCONTRAST 0x81
+#define SSD1306_DISPLAYALLON_RESUME 0xA4
+#define SSD1306_DISPLAYALLON 0xA5
+#define SSD1306_NORMALDISPLAY 0xA6
+#define SSD1306_INVERTDISPLAY 0xA7
+#define SSD1306_DISPLAYOFF 0xAE
+#define SSD1306_DISPLAYON 0xAF
+#define SSD1306_SETDISPLAYOFFSET 0xD3
+#define SSD1306_SETCOMPINS 0xDA
+#define SSD1306_SETVCOMDETECT 0xDB
+#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
+#define SSD1306_SETPRECHARGE 0xD9
+#define SSD1306_SETMULTIPLEX 0xA8
+#define SSD1306_SETLOWCOLUMN 0x00
+#define SSD1306_SETHIGHCOLUMN 0x10
+#define SSD1306_SETSTARTLINE 0x40
+#define SSD1306_MEMORYMODE 0x20
+#define SSD1306_COLUMNADDR 0x21
+#define SSD1306_PAGEADDR   0x22
+#define SSD1306_COMSCANINC 0xC0
+#define SSD1306_COMSCANDEC 0xC8
+#define SSD1306_SEGREMAP 0xA0
+#define SSD1306_CHARGEPUMP 0x8D
+
+// Scrolling #defines
+#define SSD1306_ACTIVATE_SCROLL 0x2F
+#define SSD1306_DEACTIVATE_SCROLL 0x2E
+#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
+#define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
+#define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
+#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
+#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A
 
 //
 //  Enum voor de kleuren van het scherm Black en White
@@ -60,5 +82,7 @@ char ssd1306_WriteString(char* str, FontDef Font, SSD1306_COLOR color);
 void ssd1306_SetCursor(uint8_t x, uint8_t y);
 
 void ssd1306_WriteCommand(uint8_t command);
+void ssd1306_Scroll(void);
+void startscrollright(uint8_t start, uint8_t stop);
 
 #endif

Src/main.c

@@ -32,20 +32,19 @@
   */
 /* Includes ------------------------------------------------------------------*/
 #include <string.h>
+#include <stdlib.h>
+
 #include "main.h"
 #include "stm32f4xx_hal.h"
 
 /* USER CODE BEGIN Includes */
 #include "ssd1306.h"
 #include "fonts.h"
-
 //#include "dht22.h"
-
 /* USER CODE END Includes */
 
 /* Private variables ---------------------------------------------------------*/
 I2C_HandleTypeDef hi2c1;
-
 UART_HandleTypeDef huart1;
 
 /* USER CODE BEGIN PV */
@@ -53,7 +52,7 @@ UART_HandleTypeDef huart1;
 char UART1_Data;
 char UART_Buffer[32];
 char text[32];
-unsigned char i = 0;
+int i;
 
 /* USER CODE END PV */
 
@@ -95,6 +94,13 @@ int main(void)
   ssd1306_Init();
   //DHT22_Init();
   HAL_UART_Receive_IT(&huart1, (uint8_t*) &UART1_Data, 1);
+
+/*
+  for(int y = 0; y < 129; y++) {
+    ssd1306_DrawPixel(y, 20, White);
+  }
+*/
+  //ssd1306_UpdateScreen();
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -104,23 +110,29 @@ int main(void)
   /* USER CODE END WHILE */
 
   /* USER CODE BEGIN 3 */
-    HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_6); //Toggle the state of pin PC9
+    int x, msg;
-    //HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_7); //Toggle the state of pin PC9
+    //HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_6); //Toggle the state of pin PC9
     //DHT22_Read(htim6);
     
-    ssd1306_SetCursor(0, 53);
-    ssd1306_WriteString(text, Font_7x10, White);
-    ssd1306_UpdateScreen();
 
-    for(int i = 0; i < 64; i++) {
+    //startscrollright(0x00, 0x0F);
-      ssd1306_WriteCommand(0x40 | i);
+
+    for(int times = 0; times < 12; times++) {
+      ssd1306_Scroll();
       ssd1306_UpdateScreen();
-      HAL_Delay(30);
+      HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_7); //Toggle the state of pin PC9
     }
 
-    //HAL_Delay(250);
+    x = rand() % 60 + 1;
+    msg = rand() % 2 + 1;
+    ssd1306_SetCursor(x, 53);
+    ssd1306_WriteString((msg == 1) ? "GORDOS" : "LOL", Font_7x10, White);
 
-    ssd1306_Fill(Black);
+/*
+  for(int y = 0; y < 129; y++) {
+    ssd1306_DrawPixel(y, 63, White);
+  }
+*/
     ssd1306_UpdateScreen();
   }
   /* USER CODE END 3 */
@@ -203,7 +215,7 @@ static void MX_USART1_UART_Init(void)
 {
 
   huart1.Instance = USART1;
-  huart1.Init.BaudRate = 9600;
+  huart1.Init.BaudRate = 115200;
   huart1.Init.WordLength = UART_WORDLENGTH_8B;
   huart1.Init.StopBits = UART_STOPBITS_1;
   huart1.Init.Parity = UART_PARITY_NONE;

Src/ssd1306.c

@@ -1,11 +1,38 @@
 #include"ssd1306.h"
 
 // Databuffer voor het scherm
-static uint8_t SSD1306_Buffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8];
+//static uint8_t SSD1306_Buffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8];
+static uint8_t SSD1306_Buffer[SSD1306_HEIGHT * SSD1306_WIDTH / 8];
 
 // Een scherm-object om lokaal in te werken
 static SSD1306_t SSD1306;
 
+void startscrollright(uint8_t start, uint8_t stop){
+  ssd1306_WriteCommand(SSD1306_RIGHT_HORIZONTAL_SCROLL);
+  ssd1306_WriteCommand(0X00);
+  ssd1306_WriteCommand(start);
+  ssd1306_WriteCommand(0X00);
+  ssd1306_WriteCommand(stop);
+  ssd1306_WriteCommand(0X00);
+  ssd1306_WriteCommand(0XFF);
+  ssd1306_WriteCommand(SSD1306_ACTIVATE_SCROLL);
+}
+
+void ssd1306_Scroll() 
+{
+    static uint32_t end = SSD1306_WIDTH * 8;
+    uint8_t bit_antigo = 0;
+    
+    for(uint32_t addr = 0; addr < end; addr++) {
+        if (addr > 0x79) {
+            bit_antigo = SSD1306_Buffer[addr] & 0x01;
+        }
+
+        SSD1306_Buffer[addr] >>= 1;
+        bit_antigo <<= 7;
+        SSD1306_Buffer[addr - SSD1306_WIDTH] |= bit_antigo;
+    }
+}
 
 //
 //  Een byte sturen naar het commando register
@@ -25,35 +52,41 @@ uint8_t ssd1306_Init(void)
     // Even wachten zodat het scherm zeker opgestart is
     HAL_Delay(100);
     
-	/* Init LCD */
+    ssd1306_WriteCommand(SSD1306_DISPLAYOFF);                    // 0xAE
-	ssd1306_WriteCommand(0xAE); //display off
+    ssd1306_WriteCommand(SSD1306_SETDISPLAYCLOCKDIV);            // 0xD5
-	ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode   
+    ssd1306_WriteCommand(0x80);                                  // the suggested ratio 0x80
-	ssd1306_WriteCommand(0x10); //00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
+
-	ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
+    ssd1306_WriteCommand(SSD1306_SETMULTIPLEX);                  // 0xA8
-	ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
+    ssd1306_WriteCommand(SSD1306_HEIGHT - 1);
-	ssd1306_WriteCommand(0x00); //---set low column address
+
-	ssd1306_WriteCommand(0x10); //---set high column address
+    ssd1306_WriteCommand(SSD1306_SETDISPLAYOFFSET);              // 0xD3
-	ssd1306_WriteCommand(0x40); //--set start line address
+    ssd1306_WriteCommand(0x0);                                   // no offset
-	ssd1306_WriteCommand(0x81); //--set contrast control register
+    ssd1306_WriteCommand(SSD1306_SETSTARTLINE | 0x0);            // line #0
-	ssd1306_WriteCommand(0xFF);
+    ssd1306_WriteCommand(SSD1306_CHARGEPUMP);                    // 0x8D
-	ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127
+
-	ssd1306_WriteCommand(0xA6); //--set normal display
+    ssd1306_WriteCommand(0x14);
-	ssd1306_WriteCommand(0xA8); //--set multiplex ratio(1 to 64)
+
-	ssd1306_WriteCommand(0x3F); //
+    ssd1306_WriteCommand(SSD1306_MEMORYMODE);                    // 0x20
-	ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
+    ssd1306_WriteCommand(0x00);                                  // 0x0 act like ks0108
-	ssd1306_WriteCommand(0xD3); //-set display offset
+    ssd1306_WriteCommand(SSD1306_SEGREMAP | 0x1);
-	ssd1306_WriteCommand(0x00); //-not offset
+    ssd1306_WriteCommand(SSD1306_COMSCANDEC);
-	ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
+
-	ssd1306_WriteCommand(0xF0); //--set divide ratio
+    ssd1306_WriteCommand(SSD1306_SETCOMPINS);                    // 0xDA
-	ssd1306_WriteCommand(0xD9); //--set pre-charge period
-	ssd1306_WriteCommand(0x22); //
-	ssd1306_WriteCommand(0xDA); //--set com pins hardware configuration
     ssd1306_WriteCommand(0x12);
-	ssd1306_WriteCommand(0xDB); //--set vcomh
+    ssd1306_WriteCommand(SSD1306_SETCONTRAST);                   // 0x81
-	ssd1306_WriteCommand(0x20); //0x20,0.77xVcc
+    ssd1306_WriteCommand(0xCF);
-	ssd1306_WriteCommand(0x8D); //--set DC-DC enable
+
-	ssd1306_WriteCommand(0x14); //
+    ssd1306_WriteCommand(SSD1306_SETPRECHARGE);
-	ssd1306_WriteCommand(0xAF); //--turn on SSD1306 panel
+    ssd1306_WriteCommand(0xF1);
+
+    ssd1306_WriteCommand(SSD1306_SETVCOMDETECT);                 // 0xDB
+    ssd1306_WriteCommand(0x40);
+    ssd1306_WriteCommand(SSD1306_DISPLAYALLON_RESUME);           // 0xA4
+    ssd1306_WriteCommand(SSD1306_NORMALDISPLAY);                 // 0xA6
+
+    ssd1306_WriteCommand(SSD1306_DEACTIVATE_SCROLL);
+
+    ssd1306_WriteCommand(SSD1306_DISPLAYON);//--turn on oled panel
 
     /* Clearen scherm */
     ssd1306_Fill(Black);