WIP: implementing basic displaycontrols

src/display/Display.cpp

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+#include Display.h
+
+void Display::sendDisplayCMD(uint8_t cmd){
+
+};
+void Display::begin(void){
+    //TODO: change pin to #defines, first check if Wire.begin was already called
+    Wire.begin(1,2);
+    //set Mux Ratio
+    sendDisplayCMD(client,muxRatio);
+    sendDisplayCMD(client,0x3f);
+
+    sendDisplayCMD(client,setOffset);
+    sendDisplayCMD(client,0x00);
+
+    sendDisplayCMD(client, setStartLine);
+
+
+    /*x-flip*/
+    //sendDisplayCMD(client,setSegmentMap);
+    sendDisplayCMD(client, setSegmentReMap);
+    
+    /*mapping of the rows*/
+    sendDisplayCMD(client,setComHardwareConfig);
+    sendDisplayCMD(client,0x10);
+
+    /*y-flip*/
+    //sendDisplayCMD(client, setComDirectionNormal);
+    sendDisplayCMD(client, setComDirectionFlipped);
+
+    sendDisplayCMD(client, setContrast);
+    sendDisplayCMD(client, 0x7f);
+
+    sendDisplayCMD(client,stopCompleteOn);
+
+    /*which pixels are bright: normal = 1s are bright, inverese= 0s are bright*/
+    sendDisplayCMD(client, setNormalMode);
+    //sendDisplayCMD(client, setInverseMode);
+
+    sendDisplayCMD(client, setOscFreq);
+    sendDisplayCMD(client,0x80);
+
+    sendDisplayCMD(client,setChargePump);
+    sendDisplayCMD(client,0x14);
+
+    sendDisplayCMD(client, activateDisplay);
+    return;
+};
+void Display::clear(void){
+    
+    int index=0;
+    sendDisplayCMD(client,addressingMode);
+    sendDisplayCMD(client,0x00); //horizontal
+    printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
+    sendDisplayCMD(client,colRange);
+    sendDisplayCMD(client,0x00);
+    sendDisplayCMD(client,0x7f);
+    printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
+    sendDisplayCMD(client,pageRange);
+    sendDisplayCMD(client,0x00);
+    sendDisplayCMD(client,0x07);
+    printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
+    i2c_data[0]=data_byte;
+    for(index=1;index<128*8;index++){i2c_data[index]=0x00;}
+    printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
+    Wire.beginTransmission(DisplayAdress);
+    Wire.write(data_byte);
+    Wire.endTransmission();
+    //Wire only has a 32-Byte Buffer for transmission
+    for(uint index= 0; index<4;index++){
+        Wire.beginTransmission(DisplayAdress);
+        for(uint bufferIndex = 0;bufferIndex<32;bufferIndex++){
+            Wire.write(0x00);
+        }
+        Wire.endTransmission();
+    } 
+    return;
+};
+
+/**
+ * @brief updates amount of chars on current rows and also the current row
+ * 
+ * @param charAmount how many chars were added 
+ */
+void Display::updateLine(int charAmount)
+{
+    if(charAmount+this->charsOnCurrLine>16)
+    {
+        this->currLine = (this->currLine+((charAmount+this->charsOnCurrLine)/16))%8;
+        this->charsOnCurrLine = (charAmount+this->charsOnCurrLine)%17; //there can be 0-16 chars on one line, so the 17th char is on next line 
+    }
+    else
+    {
+        this->charsOnCurrLine = this->charAmount+this->charsOnCurrLine;
+    }
+}
+
+
+void Display::print(char *value){
+    int i = 0;
+    int charval;
+    int nextchar;
+	/* write data to the buffer */
+	//check if input is a predefined cmd
+    for(i=0;i<count;i++) //count-1 to prevent the terminate string to be send
+        {
+            charval = procfs_buffer[i];
+            if(charval=='/')
+            {
+                nextchar = procfs_buffer[i+1];
+                if(nextchar=='c')
+                {
+                    clearDisplay(display_i2c_client);
+                    currLine = 0; 
+                    charsOnCurrLine = 0;
+                }
+                else if(nextchar=='n')
+                {
+                    if(charsOnCurrLine==16)
+                    {
+                        currLine=currLine+1;
+                        charsOnCurrLine=0;
+                    }
+                    while(charsOnCurrLine<17)
+                    {
+                        i2c_master_send(display_i2c_client,font8x8_colwise[0],9);
+                        updateLine(1);
+                        if(charsOnCurrLine==16)
+                        {
+                            break;
+                        }
+                    }
+                }
+                else
+                {
+
+                }
+                i=i+1;
+            }
+            else
+            {
+                updateLine(1);
+                i2c_master_send(display_i2c_client,font8x8_colwise[charval],9);
+            }
+                      
+        }
+   // }
+    
+	
+	
+	return procfs_buffer_size;
+}
+};
+void Display::println(char *value){
+
+};
+void Display::print(int value);

src/display/Display.h

@@ -0,0 +1,37 @@
+/**
+ * @file InfraredLight.h
+ * @author Hans Haupt (hans.haupt@dezibot.de)
+ * @brief Adds the ability to print to the display of the robot.
+ * @version 0.1
+ * @date 2024-05-24
+ * 
+ * @copyright Copyright (c) 2024
+ * 
+ */
+
+#ifndef Display_h
+#define Display_h
+#include <stdint.h>
+#include <Arduino.h>
+#include "DisplayCMDs.h"
+
+
+#define display
+class Display{
+    protected:
+        //how many chars are on current line
+        uint8_t charsOnCurrLine = 0;
+        //on which line are we currently printing
+        uint8_t currLine = 0;
+        void sendDisplayCMD(uint8_t cmd);
+        void updateLine(uint charAmount);
+    public:
+        void begin(void);
+        void clear(void);
+        void print(char *value);
+        void println(char *value);
+        void print(int value);
+};
+
+
+#endif //Display_h

src/display/DisplayCMDs.h

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+#define cmd_byte 0x80
+#define data_byte 0x40
+#define muxRatio 0xa8 //needs second argument ranging from 16-63
+#define setOffset 0xd3 //needs second argument ranging from 0-63
+#define setStartLine 0x40
+#define setSegmentMap 0xa0
+#define setSegmentReMap 0xa1
+#define setComDirectionNormal 0xc0
+#define setComDirectionFlipped 0xc8
+#define setComHardwareConfig 0xda //needs second arg
+#define setContrast 0x81 //needs second arg
+#define completeOn 0xa5
+#define stopCompleteOn 0xa4
+#define setNormalMode 0xa6
+#define setInverseMode 0xa7
+#define setOscFreq 0xd5 //needs second arg
+#define setChargePump 0x8d//needs second arg 0x14 for enable
+#define activateDisplay 0xaf
+#define disableDisplay 0xae  
+#define addressingMode 0x20
+#define colRange 0x21
+#define pageRange 0x22
+
+#define DisplayAdress