template<typename cs_pin>
class TDisplay
{
  private:
      spi_base_t& spi;
      typedef cs_pin LCD_CS;
      
      Pin<2, 6, 'H'> LCD_RS;    // H for Data, L for Command
      Pin<1, 4, 'L'> LCD_RST;   // Active 0, set to it during CSL
      uint8_t   status;         // 1/0 - On/Off. OLED requires to be off when not in use
      
      unsigned char   *font;
      uint8_t fontnumber, fontwidth, fontheight;
      uint8_t x, y; // position on the screen
      
      inline void select(void) { spi.lock(); LCD_CS::On(); }
      inline void deselect(void) { LCD_CS::Off(); spi.unlock();  }
      inline void send(uint8_t data) { spi << data; }
      void send_array(uint8_t *data, uint16_t count)
      { select();
        for(uint16_t i=0; i<count; i++)
          spi << data[i];
        deselect();
      }
      void send_command(uint8_t *data, uint16_t count);
      void send_data(uint8_t *data, uint16_t count);
      void goto_xy(uint8_t x, uint8_t y);
  public:
      TDisplay(uint8_t *init, spi_base_t& spiref): spi(spiref);            
      void Set_contrast(uint8_t data);
      
      uint8_t getstatus(void);
      void On(void);    // Because of using OLED display
      void Off(void);   // Because of using OLED display
      
      void SetFont(uint8_t num);
      uint8_t GetFont(void);
      void ClrLines(unsigned char startline, unsigned char linesnum);    // Clear number of text lines
      void ClrText(unsigned char line, unsigned char xpos, unsigned char length); // Clear part of the line
      void putchar(unsigned char ch, uint8_t xpos, uint8_t ypos);
      void putstring(char *string, uint8_t xpos, uint8_t ypos);
      void ShowFont(unsigned char num);
}

const uint8_t init[] =  {0x40,    //Display start line 0
                         0xa1,    //ADC reverse    <<<< Probably need to be changed
                         0xc0,    //Normal COM0...COM63
                         0xa6,    //Display normal
                         0xa2,    //Set Bias 1/9 (Duty 1/65)
                         0x2f,    //Booster, Regulator and Follower On
                         0xf8,    //Set internal Booster to 4x
                         0x00,
                         0x27,    //Contrast set
                         0x81,
                         0x16,
                         0xac,    //Set indicator
                         0x00,     //0x01,
                         0xAF, //};    //Display on
                         0xb0,    //Page start sddress 0
                         0x10,    //Set Higher Column Start Address 0
                         0x00     //Set Lower Column Start Address 0
                         };

/**************** Functions **************************************************/

void TDisplay::send_command(uint8_t *data, uint16_t count)
{
  LCD_RS::Off();    // switch to send command
  send_array(data, count);  // SPI CS controlled inside this function
}

void TDisplay::send_data(uint8_t *data, uint16_t count)
{
  LCD_RS::On();    // switch to send data
  send_array(data, count);  // SPI CS controlled inside this function
}

// Set symbol position in text mode
//Parameter:
//     x:    X - Position on screen (0 - 127)
//     y:    Y - Position on screen (0 - 8)
void TDisplay::goto_xy(uint8_t x, uint8_t y);
{
  uint8_t set[] = {0xb0, 0x10, 0x00};    //Control commands array
  set[0] += y;        //Y - Add Y Position to Set Page Start Address
  set[1] += x >> 4;   //High - Nibble auf Steuerbefehl addieren
  set[2] += x & 0x0f; //Low - Nibble auf Steuerbefehl addieren
  send_command(set, 3);
}

//TDisplay constructor
TDisplay::TDisplay(uint8_t *init, spi_base_t& spiref): spi(spiref)
{
  LCD_RST::Off();   // unreset LCD
  
  send_command((uint8_t *)init, sizeof(init));  // Initialization

    for(uint8_t line=0; line<8; line++) // clear display memory
    {
        goto_xy(0, line);
        spiref.select();
        send(0);
        spiref.deselect();
    }
}

template<typename cs_pin>
class TDisplay
{
...

template<typename cs_pin>
void TDisplay<cs_pin>::send_command(uint8_t *data, uint16_t count)
{
...

Error[Pe020]: identifier "namespace" is undefined      D:\Designs\M3\Firmware\M3_Terminal\scmRTOS\Common\usrlib.h 52

Error[Pe864]: spi_t is not a template D:\Designs\M3\Firmware\M3_Terminal\M3_Terminal.h 19
Error[Pe020]: identifier "SPI1" is undefined D:\Designs\M3\Firmware\M3_Terminal\M3_Terminal.h 19

#include "spi.h"

#ifndef M3_TERMINAL_H
#define M3_TERMINAL_H

#define CSL_used

#include "Peripheral\pin.h"
#include "Peripheral\spi.h"

typedef spi_t<SPI1> TSpi1;
extern    TSpi1 spi1;

typedef TDisplay < Pin<2, 5, 'L'> > TDisplay;
extern    TDisplay    display;

#endif  // M3_TERMINAL_H