Diff: oled.h

Revision:

0:8fa1c7356f71

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/oled.h	Wed Jun 24 11:37:11 2020 +0000
@@ -0,0 +1,179 @@
+// oled.h
+// This class is for the SSD1306 OLED
+// 
+#include <mbed.h>
+#include "font5x7.h"
+I2C i2c(P0_30, P0_0); // SDA is on P0_30, SCL is on P0_0
+class oled 
+{
+
+public: 
+    oled() {};
+    void clear()
+    {
+        for (int i = 0; i < 8; i++)
+        {
+            clearOLEDLine(i);
+        }
+    }
+    void begin()
+    {
+        resetOLED();
+        clear();
+    }
+    void print(int Col, int Row, const char *Text)
+    {
+        // write the supplied text (up to 25 bytes) to the given display line
+        int i;
+        uint8_t RowData[128];
+        for (i = 0; i < 128; i++)
+            RowData[i] = 0;
+        while (*Text) {
+            for (i = 0; i < FONT_WIDTH; i++)
+            {
+                RowData[Col * FONT_WIDTH + i] = Font5x7[FONT_WIDTH * ((*Text) - 32) + i];
+            }
+            Col++;
+            Text++;
+            if (Col > 24)
+                break; // Can't print past end of the screen
+        }
+        writeOLEDLine(Row, RowData);
+    }
+    void print(int Col, int Row, int32_t Value)
+    {
+        char Text[20];
+        int2Text(Text,Value);
+        print(Col,Row,Text);
+    }
+   
+private:
+    void writeOLEDLine(int LineNumber, uint8_t *Values)
+    {
+        // Writes the set of values to the given line number
+        writeOLEDRegister(0x00, 0x21);
+        writeOLEDRegister(0x00, 0);
+        writeOLEDRegister(0x00, 127);
+        writeOLEDRegister(0x00, 0x22);
+        writeOLEDRegister(0x00, LineNumber); // Page address
+        writeOLEDRegister(0x00, 7);
+        writeOLEDBytes(0x40, 128, Values);
+    }
+    uint8_t writeOLEDRegister(uint8_t RegNum, uint8_t Value)
+    {
+        char TXData[2];
+        TXData[0] = RegNum;
+        TXData[1] = Value;
+        return i2c.write(0x3c << 1,(const char *)TXData,2);    
+    }
+    void resetOLED()
+    {
+        // Reset sequence got from https://github.com/adafruit/Adafruit_SSD1306/blob/master/Adafruit_SSD1306.cpp
+        writeOLEDRegister(0x00, 0xae);
+        writeOLEDRegister(0x00, 0xd5);
+        writeOLEDRegister(0x00, 0x80);
+        writeOLEDRegister(0x00, 0xa8);
+        writeOLEDRegister(0x00, 63);
+        writeOLEDRegister(0x00, 0xd3);
+        writeOLEDRegister(0x00, 0);
+        writeOLEDRegister(0x00, 0x40);
+        writeOLEDRegister(0x00, 0x8d);
+        writeOLEDRegister(0x00, 0x14);
+        writeOLEDRegister(0x00, 0x20);
+        writeOLEDRegister(0x00, 0x00);
+        writeOLEDRegister(0x00, 0xa1);
+        writeOLEDRegister(0x00, 0xc8);
+        
+        writeOLEDRegister(0x00, 0xda);
+        writeOLEDRegister(0x00, 0x12);
+        writeOLEDRegister(0x00, 0x81);
+        writeOLEDRegister(0x00, 0xcf);
+        
+        writeOLEDRegister(0x00, 0xd9);
+        writeOLEDRegister(0x00, 0xf1);
+        writeOLEDRegister(0x00, 0xdb);
+        writeOLEDRegister(0x00, 0x40);
+        writeOLEDRegister(0x00, 0xa4);
+        writeOLEDRegister(0x00, 0xa6);
+        writeOLEDRegister(0x00, 0x2e);
+        writeOLEDRegister(0x00, 0xaf);
+    }
+    void clearOLEDLine(int LineNumber)
+    {
+        // Clears the given line (range 0 to 7) on the display
+        // A line is 8 pixels high
+        writeOLEDRegister(0x00, 0x21);
+        writeOLEDRegister(0x00, 0);
+        writeOLEDRegister(0x00, 127);
+        writeOLEDRegister(0x00, 0x22);
+        writeOLEDRegister(0x00, LineNumber); // Page address
+        writeOLEDRegister(0x00, 7);
+        fillOLEDBytes(0x40, 128, 0x00);
+    }
+    
+    
+    uint8_t fillOLEDBytes(uint8_t RegNum, uint8_t Count, uint8_t Value)
+    {
+        // Repeatedly writes the given Value to the OLED memory - useful
+        // for clearing the display
+        uint8_t TXData[Count+1];    
+        int i;
+        TXData[0] = RegNum;
+        for (i = 0; i < Count; i++)
+        {
+            TXData[i + 1] = Value;
+        }
+        return i2c.write(0x3c << 1,(const char *)TXData,Count+1);    
+    }
+    uint8_t writeOLEDBytes(uint8_t RegNum, uint8_t Count, uint8_t *Values)
+    {
+        // Writes the array of up to 128 bytes to the OLED display
+        if (Count > 128)
+            return -1;
+        uint8_t TXData[Count+1];        
+        int i;
+        TXData[0] = RegNum;
+        for (i = 0; i < Count; i++)
+        {
+            TXData[i + 1] = Values[i];
+        }
+        return i2c.write(0x3c << 1,(const char *)TXData,Count+1);    
+    }
+
+    
+    void int2Text(char *Text, int32_t Value)
+    {
+        int index;
+        Text[11]=0;
+        if (Value < 0)
+        {
+            Text[0]='-';
+            Value = -Value;
+        }
+        else
+        {
+            Text[0] = '+';
+        }
+        for (index = 0; index < 10;index++)
+        {
+            Text[10-index]=(Value % 10) + '0';
+            Value = Value / 10;
+        }   
+    }
+    void int2Hex(char *Hex, uint32_t Value)
+    {
+        int temp;
+        int index;
+        Hex[8]=0;
+        for (index = 0; index < 8;index++)
+        {
+            temp = Value % 16;
+            if (temp < 10)
+                temp = temp + '0';
+            else
+                temp = temp + 'A' - 10;
+            Hex[7-index]=temp;
+            Value = Value / 16;
+        }
+    }
+};