Diff: oled.cpp

Revision:

0:9b6fbe273511

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/oled.cpp	Wed Mar 17 13:55:03 2021 +0000
@@ -0,0 +1,196 @@
+/**
+ * SSD1306xLED - Library for the SSD1306 based OLED/PLED 128x64 displays
+ *
+ * @author Neven Boyanov
+ *
+ * This is part of the Tinusaur/SSD1306xLED project.
+ *
+ * Copyright (c) 2018 Neven Boyanov, The Tinusaur Team. All Rights Reserved.
+ * Distributed as open source software under MIT License, see LICENSE.txt file.
+ * Retain in your source code the link http://tinusaur.org to the Tinusaur project.
+ *
+ * Source code available at: https://bitbucket.org/tinusaur/ssd1306xled
+ *
+ */
+
+// ============================================================================
+// ACKNOWLEDGEMENTS:
+// - Some code and ideas initially based on "IIC_wtihout_ACK" 
+//   by http://www.14blog.com/archives/1358 (defunct)
+// - Init sequence used info from Adafruit_SSD1306.cpp init code.
+// ============================================================================
+
+// ============================================================================
+// STATEMENT:
+// - gründlich aufgeräumt 
+//   29.05.2020 by Jens Altenburg
+// ============================================================================
+
+#include "oled.h"
+#include "font6_8.h"
+#include "font8_16.h"
+
+// ----------------------------------------------------------------------------
+
+void ssd1306_start_command(void);       // Initiate transmission of command
+void ssd1306_start_data(void);          // Initiate transmission of data
+void ssd1306_data_byte(byte);           // Transmission 1 byte of data
+void ssd1306_stop(void);                // Finish transmission
+
+// ----------------------------------------------------------------------------
+
+const byte ssd1306_init_sequence[] = {  // Initialization Sequence
+
+    0xAE,           // Set Display ON/OFF - AE=OFF, AF=ON
+    0xD5, 0xF0,     // Set display clock divide ratio/oscillator frequency, set divide ratio
+    0xA8, 0x3F,     // Set multiplex ratio (1 to 64) ... (height - 1)
+    0xD3, 0x00,     // Set display offset. 00 = no offset
+    0x40 | 0x00,    // Set start line address, at 0.
+    0x8D, 0x14,     // Charge Pump Setting, 14h = Enable Charge Pump
+    0x20, 0x00,     // Set Memory Addressing Mode - 00=Horizontal, 01=Vertical, 10=Page, 11=Invalid
+    0xA0 | 0x01,    // Set Segment Re-map
+    0xC8,           // Set COM Output Scan Direction
+    0xDA, 0x12,     // Set COM Pins Hardware Configuration - 128x32:0x02, 128x64:0x12
+    0x81, 0x3F,     // Set contrast control register
+    0xD9, 0x22,     // Set pre-charge period (0x22 or 0xF1)
+    0xDB, 0x20,     // Set Vcomh Deselect Level - 0x00: 0.65 x VCC, 0x20: 0.77 x VCC (RESET), 0x30: 0.83 x VCC
+    0xA4,           // Entire Display ON (resume) - output RAM to display
+    0xA6,           // Set Normal/Inverse Display mode. A6=Normal; A7=Inverse
+    0x2E,           // Deactivate Scroll command
+    0xAF,           // Set Display ON/OFF - AE=OFF, AF=ON
+    //
+    0x22, 0x00, 0x3f,   // Set Page Address (start,end)
+    0x21, 0x00, 0x7f,   // Set Column Address (start,end)
+    //
+    };
+
+
+// ----------------------------------------------------------------------------
+
+void i2csw_start(void);
+void i2csw_stop(void);
+void i2csw_byte(byte);
+
+// ----------------------------------------------------------------------------
+
+void i2csw_start(void) {
+    vSDAOutput();
+    /* SCL ist immer Output */
+    vSDA_H();       /* SDA setzen */
+    vSCL_H();       /* SCL setzen */
+    vSDA_L();       /* SDA löschen */
+    vSCL_L();     
+    }
+
+void i2csw_stop(void) {
+    vSDA_L();       /* SDA löschen */
+    vSCL_L();       /* SCL löschen */
+    vSDA_H();       /* SDA, SCL setzen */
+    vSCL_H();
+    vSDAInput();    /* SDA-Datenrichtung -> Input */
+    }
+
+void i2csw_byte(byte bData) {
+    byte i;
+    for (i = 0; i < 8; i++) {
+        if ((bData << i) & 0x80) vSDA_H(); 
+        else                     vSDA_L(); 
+        vI2CShort();    /* set-up-Zeit */
+        vSCL_H(); 
+        vI2CDelay();    /* SCL-high-time */
+        vSCL_L(); 
+        vI2CShort();    /* set-up-Zeit */
+        }
+    vSDA_L(); 
+    vI2CShort();        /* set-up-Zeit */
+    vSCL_H(); 
+    vI2CDelay();        /* SCL-high-time */
+    vSCL_L(); 
+    vI2CShort();        /* set-up-Zeit */
+    }
+
+// ============================================================================
+
+void ssd1306_start_command(void) {
+    i2csw_start();
+    i2csw_byte(0x78);           // Slave address: R/W(SA0)=0 - write
+    i2csw_byte(0x00);           // Control byte: D/C=0 - write command
+}
+
+void ssd1306_start_data(void) {
+    i2csw_start();
+    i2csw_byte(0x78);           // Slave address, R/W(SA0)=0 - write
+    i2csw_byte(0x40);           // Control byte: D/C=1 - write data
+}
+
+void ssd1306_data_byte(byte b) {
+    i2csw_byte(b);
+}
+
+void ssd1306_stop(void) {
+    i2csw_stop();
+}
+
+// ============================================================================
+
+void vOledInit(void) {
+    byte i;
+    ssd1306_start_command();    // Initiate transmission of command
+    for (i = 0; i < sizeof (ssd1306_init_sequence); i++) {
+        ssd1306_data_byte(ssd1306_init_sequence[i]);    // Send the command out
+    }
+    ssd1306_stop(); // Finish transmission
+}
+
+void ssd1306_setpos(byte x, byte y) {
+    ssd1306_start_command();
+    ssd1306_data_byte(0xb0 | (y & 0x07));   // Set page start address
+    ssd1306_data_byte(x & 0x0f);            // Set the lower nibble of the column start address
+    ssd1306_data_byte(0x10 | (x >> 4));     // Set the higher nibble of the column start address
+    ssd1306_stop(); // Finish transmission
+}
+
+void ssd1306_fill4(byte p1, byte p2, byte p3, byte p4) {
+    word i;
+    ssd1306_setpos(0, 0);
+    ssd1306_start_data();   // Initiate transmission of data
+    for (i = 0; i < 128 * 8 / 4; i++) {
+        ssd1306_data_byte(p1);
+        ssd1306_data_byte(p2);
+        ssd1306_data_byte(p3);
+        ssd1306_data_byte(p4);
+    }
+    ssd1306_stop(); // Finish transmission
+}
+
+// ----------------------------------------------------------------------------
+
+void ssd1306tx_char(byte ch) {
+    byte i;
+    word j = (ch-32)*6;
+    ssd1306_start_data();
+    for (i = 0; i < 6; i++) {
+        ssd1306_data_byte(ssd1306xled_font6x8data[j + i]);
+    }
+    ssd1306_stop();
+} 
+
+void ssd1306tx_large(byte ch, byte x, byte y) {
+    byte i, yy;
+    word j = (ch-32)*16;
+    yy = y >> 1;
+    ssd1306_setpos(x, (yy));
+    ssd1306_start_data();
+    for (i = 0; i < 8; i++) {
+        ssd1306_data_byte(ssd1306xled_font8x16data[j + i]);
+        }
+    ssd1306_stop();
+    ssd1306_setpos(x, (yy+1));
+    ssd1306_start_data();
+    for (i = 8; i < 16; i++) {
+        ssd1306_data_byte(ssd1306xled_font8x16data[j + i]);
+        }
+    ssd1306_stop();
+    } 
+
+// ============================================================================ 
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