[moved] C8051340F micro controller - how to calculate Freq/Bpm and display on lcd

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/*
    Graphic LCD 64 by 128 pixels, Monochrome
    SP5-GFX1
     Connection to P2 of 8051  : Silicon Lab C8051F340
    #1 GND
    #2 +5V
    #3 SI  serial data -- P2.7
    #4 SCL serial clock -- P2.6
    #5 A0P  0 = select control, 1 = data port --- P2.5
    #6 RESET low to reset LCD panel -- P2.4
    #7 CS1  chip select, 0 = enable data transfer -- P2.3
    #8 BL-  Back light - GND
    #9 BL+  Back light - +5V
 
    Page memory for display : B0 to B7, eight pages, one page 128 bytes
        each byte for 8 rows x 1 column, bit 0 at row 0, bit 1 at row 1 etc.    
 
    last edited : 15 Jan 2015.
    Version 1.0
*/
//#include <reg51.h>
#include <c8051f340.h>                 // SFR declarations
 
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
 
#define SYSCLK      12000000           // SYSCLK frequency in Hz
 
sfr16 ADC0 = 0xbd;      // ADC0 result register
sfr16 TMR2RL   = 0xca;                 // Timer2 reload value
sfr16 TMR2     = 0xcc;                 // Timer2 counter
 
/*
sbit LCD_SI = P2^1;
sbit LCD_SCL = P2^2;
sbit LCD_A0P = P2^3;
sbit LCD_RESET = P2^4;
sbit LCD_CS1 = P2^5;
*/
 
 
sbit LCD_SI = P2^7;
sbit LCD_SCL = P2^6;
sbit LCD_A0P = P2^5;
sbit LCD_RESET = P2^4;
sbit LCD_CS1 = P2^3;
 
int i,j,k,m;
 
// 5 columns by 8 rows ASCII font, starting from SPACE, 0x20
code unsigned char font[] = {
   0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x5f,0x00,0x00,   //  !
   0x00,0x03,0x00,0x03,0x00,0x14,0x7f,0x14,0x7f,0x14,   // "#
   0x24,0x2a,0x7f,0x2a,0x12,0x23,0x13,0x08,0x64,0x62,   // $%
   0x36,0x49,0x55,0x22,0x50,0x00,0x05,0x03,0x00,0x00,   // &'
   0x00,0x1c,0x22,0x41,0x00,0x00,0x41,0x22,0x1c,0x00,   // ()
   0x14,0x08,0x3e,0x08,0x14,0x08,0x08,0x3e,0x08,0x08,   // *+
   0x00,0x50,0x30,0x00,0x00,0x08,0x08,0x08,0x08,0x08,   // ,-
   0x00,0x60,0x60,0x00,0x00,0x20,0x10,0x08,0x04,0x02,   // ./
   0x3e,0x51,0x49,0x45,0x3e,0x00,0x42,0x7f,0x40,0x00,   // 01
   0x42,0x61,0x51,0x49,0x46,0x21,0x41,0x45,0x4b,0x31,   // 23
   0x18,0x14,0x12,0x7f,0x10,0x27,0x45,0x45,0x45,0x39,   // 45
   0x3c,0x4a,0x49,0x49,0x30,0x01,0x71,0x09,0x05,0x03,   // 67
   0x36,0x49,0x49,0x49,0x36,0x06,0x49,0x49,0x29,0x1e,   // 89
   0x00,0x36,0x36,0x00,0x00,0x00,0x56,0x36,0x00,0x00,   // :;
   0x08,0x14,0x22,0x41,0x00,0x14,0x14,0x14,0x14,0x14,   // <=
   0x00,0x41,0x22,0x14,0x08,0x02,0x01,0x51,0x09,0x06,   // >?
   0x32,0x49,0x79,0x41,0x3e,0x7e,0x11,0x11,0x11,0x7e,   // @A
   0x7f,0x49,0x49,0x49,0x36,0x3e,0x41,0x41,0x41,0x22,   // BC
   0x7f,0x41,0x41,0x22,0x1c,0x7f,0x49,0x49,0x49,0x41,   // DE
   0x7f,0x09,0x09,0x09,0x01,0x3e,0x41,0x49,0x49,0x7a,   // FG
   0x7f,0x08,0x08,0x08,0x7f,0x00,0x41,0x7f,0x41,0x00,   // HI
   0x20,0x40,0x41,0x3f,0x01,0x7f,0x08,0x14,0x22,0x41,   // JK
   0x7f,0x40,0x40,0x40,0x40,0x7f,0x02,0x0c,0x02,0x7f,   // LM
   0x7f,0x04,0x08,0x10,0x7f,0x3e,0x41,0x41,0x41,0x3e,   // NO
   0x7f,0x09,0x09,0x09,0x06,0x3e,0x41,0x51,0x21,0x5e,   // PQ
   0x7f,0x09,0x19,0x29,0x46,0x46,0x49,0x49,0x49,0x31,   // RS
   0x01,0x01,0x7f,0x01,0x01,0x3f,0x40,0x40,0x40,0x3f,   // TU
   0x1f,0x20,0x40,0x20,0x1f,0x3f,0x40,0x38,0x40,0x3f,   // VW
   0x63,0x14,0x08,0x14,0x63,0x07,0x08,0x70,0x08,0x07,   // XY
   0x61,0x51,0x49,0x45,0x43,0x00,0x7f,0x41,0x41,0x00,   // Z[
   0x02,0x04,0x08,0x10,0x20,0x00,0x41,0x41,0x7f,0x00,   // \]
   0x04,0x02,0x01,0x02,0x04,0x40,0x40,0x40,0x40,0x40,   // ^_
   0x00,0x01,0x02,0x04,0x00,0x20,0x54,0x54,0x54,0x78,   // `a
   0x7f,0x48,0x44,0x44,0x38,0x38,0x44,0x44,0x44,0x20,   // bc
   0x38,0x44,0x44,0x48,0x7f,0x38,0x54,0x54,0x54,0x18,   // de
   0x08,0x7e,0x09,0x01,0x02,0x0c,0x52,0x52,0x52,0x3e,   // fg
   0x7f,0x08,0x04,0x04,0x78,0x00,0x44,0x7d,0x40,0x00,   // hi
   0x20,0x40,0x44,0x3d,0x00,0x7f,0x10,0x28,0x44,0x00,   // jk
   0x00,0x41,0x7f,0x40,0x00,0x7c,0x04,0x18,0x04,0x78,   // lm
   0x7c,0x08,0x04,0x04,0x78,0x38,0x44,0x44,0x44,0x38,   // no
   0x7c,0x14,0x14,0x14,0x08,0x08,0x14,0x14,0x18,0x7c,   // pq
   0x7c,0x08,0x04,0x04,0x08,0x48,0x54,0x54,0x54,0x20,   // rs
   0x04,0x3f,0x44,0x40,0x20,0x3c,0x40,0x40,0x20,0x7c,   // tu
   0x1c,0x20,0x40,0x20,0x1c,0x3c,0x40,0x30,0x40,0x3c,   // vw
   0x44,0x28,0x10,0x28,0x44,0x0c,0x50,0x50,0x50,0x3c,   // xy
   0x44,0x64,0x54,0x4c,0x44,0x00,0x08,0x36,0x41,0x00,   // z{
   0x00,0x00,0x7f,0x00,0x00,0x00,0x41,0x36,0x08,0x00,   // |}
   0x10,0x08,0x08,0x10,0x08,0x00,0x00,0x02,0x05,0x02 }; // ^degree
 
 
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
 
void delay(int d);             // delay by d ms
void delaya(void);             // a short delay
void SYSCLK_Init (void);       // set CPU clock
void PORT_Init (void);         // init CPU ports
void LCD_reset(void);          // reset LCD
void LCD_command(unsigned char);        // Send command code to LCD  
void LCD_data(unsigned char);       // ASCII character to be displayed on LCD 
void SPI_send(unsigned char);       // shift 8 bit data to LCD SPI interface, high bit first
void write_char(unsigned char);     // display an ASCII code at current position
void write_msg_xy(unsigned char, unsigned char, unsigned char*); // write strting at x col, y row
void set_xy(unsigned char x, unsigned char y);  // set cursor position
void plot_xy(unsigned char x, unsigned char y);
 
//-----------------------------------------------------------------------------
 
 
void timer0_interrupt(void) interrupt 1 using 1   //auto reload every 50us
{
 
}
 
 
void LCD_Clear_Display()
{
    for(k=0; k<8; k++)     // clear display
    {
        LCD_command(0xB0 + k); delay(20);
        LCD_command(0x10);  //high nibble of column address
        LCD_command(0x00);  // low 4 bits of column address
      for(i=0; i<128; i++)
      {
        LCD_data(0x00);  
      }
    }
}
 
void delay(int d)  // delay for d ms
{
   int i, j;
   for(i=0; i<d; i++)
     for(j=0; j<1179; j++);
}
 
void delaya()     //a short delay
{
  char j;
  for(j=0; j<1; j++);
}
 
void main (void) 
{
   PCA0MD &= ~0x40;                    // WDTE = 0 (clear watchdog timer 
                                       // enable)
   PORT_Init();                        // Initialize Port I/O
   SYSCLK_Init ();                     // Initialize Oscillator
 
// ADC init.
   ADC0CN = 0x00;                      // ADC0 disabled, normal tracking, 
                                       // conversion triggered on TMR2 overflow
   REF0CN = 0x03;                      //Internal voltage reference for ADC 
   AMX0P = 0x00;                       //   0x05=P2^6.. 0x13 ADC0 positive input = P1.1
   AMX0N = 0x1F;                       // ADC0 negative input = GND
                                       // i.e., single ended mode
   ADC0CF = ((SYSCLK/3000000)-1)<<3;   // set SAR clock to 3MHz
   ADC0CF |= 0x00;                     // right-justify results 
   AD0EN = 1; 
   
  // SFRPAGE = TIMER01_PAGE;             // Set SFR page
 
   TH0 = -151;  // -149;                        // Init Timer0 High register
   TL0 = TH0;                          // Set the intial Timer0 value
   ET0=1;                              // Timer0 interrupt enabled
   TCON = 0x10;                        // Timer0 ON
   TMOD = 0x02;                        // Timer0 in 8-bit reload mode
    EA = 1;       // allows interrupt
 
   delay(200);
 
 
 // initialize graphic LCD, set 8x8 fonts and graphic, OR mode for text and graphic
    LCD_reset();  
    LCD_command(0xA2);     // LCD bias, 1/9 bias
    LCD_command(0xA0);     // set normal display mode
    LCD_command(0xC8);     // set output mode
    LCD_command(0x23);     // set voltage regulator internal resistor
    LCD_command(0x81);     // electronic voltage double - two byte instruction
    LCD_command(0x1D);     // 6 bits, 0 to 0x2F, increase contrast
    LCD_command(0x2B);     // set power control circuit
    LCD_command(0x40);     // set start line = 0
    LCD_command(0xAF);     // setdisplay on
    LCD_command(0x10);     // lower 4 bits for high nibble of column address, 0 to 127
    LCD_command(0x00);     // lower 4 bits for low nibble of column address
    LCD_command(0xB0);     // set page address, B0 to B7 for 8 pages
    LCD_Clear_Display();    //clear LCD screen
 
 
 
     write_msg_xy(0, 0, "BVP(C)2015 NYP/BEMG 70BPM");
     delay(200);
 
     
// enable timer interrupts
//  ET0=1;
//  TMOD=0x21;
//  TR0=1;
//  EA=1;
 
  while(1)
  {
    for(k=0; k<127; k++)
    {
 
      m= 63 - (ADC0>>4);    //take high 6 bits from the 10-bit adc
      plot_xy(k, m);
      plot_xy(k, m-1);  // add two more dots for thicker lines
      plot_xy(k, m+1);
      delay(30);
      AD0BUSY = 1;  // start ADC conversion
/*
      if ((k & 0x1F) == 0 )          //draw straight lines
      {
        for(j=0; j<4; j++)
        {
            set_xy(k,4+j);  
            LCD_data(0xFF);
         }
      }
*/
    }
 
    
    LCD_Clear_Display();
    write_msg_xy(100, 55, "72BPM");
 
  } // end while(1) 
} // end main 
 
 
// configure I/O ports
void PORT_Init (void)
{
/*
    P1SKIP=0x20;
    P1MDOUT = 0x0F;         
    P2MDOUT = 0x3F;
  //  P3MDOUT = 0xFF;           // for ULN2803 drivers
  //  P4MDOUT = 0xFF;
  //  P0MDOUT = 0xFF;           // for LTC1298, LCD interfaces
    P2MDIN &= 0x0BF;        // P2.6 as ADC0
 
    P0MDOUT |= 0x10;        // Enable UTX as push-pull output
    XBR0     = 0x01;        // Enable UART on P0.4(TX) and P0.5(RX)                     
    XBR1     = 0x40;        //0x40; Enable crossbar and weak pull-ups
//  P2 = 0xFF;
//  P3 = 0xFF;
//  P4 = 0xFF;
*/
 
    P1MDOUT = 0x00;         // enable P1 outputs
    P2MDOUT = 0xFE;
    P3MDOUT = 0xFF;         // for ULN2803 drivers
    P4MDOUT = 0xFF;
    P0MDOUT = 0xFF;         // for LTC1298, LCD interfaces
 
//  P0MDOUT |= 0x10;        // Enable UTX as push-pull output
//      XBR0     = 0x01;        // Enable UART on P0.4(TX) and P0.5(RX)                     
    XBR1     = 0x40;        //0x40; Enable crossbar and weak pull-ups
    P2 = 0xFF;
    P3 = 0xFF;
    P4 = 0xFF;
}
 
//-----------------------------------------------------------------------------
// initializes the system clock to use the internal oscillator
void SYSCLK_Init (void)
{
   OSCICN |= 0x03;                     // Configure internal oscillator 
   RSTSRC  = 0x04;                     // Enable missing clock detector
}
 
 
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// LCD routnies 
// send one byte to SPI interface
void SPI_send(unsigned char dd)
{
unsigned char i;
    LCD_CS1=0;
    for(i=0; i<8; i++)
    {
       LCD_SCL=0;       // set clock pulse low first
       if( dd  & 0x80 )  // set data bit
        LCD_SI=1;
       else
        LCD_SI=0;
       LCD_SCL=1;       // clock high
       dd = dd <<= 1;   // shifted to next bit
    }
    LCD_CS1=1;
    delaya();
}
 
 
void LCD_reset()
{
  LCD_RESET = 0;
  delay(10);
  LCD_RESET = 1;
  delay(10);
}
 
 
void LCD_command(unsigned char ch) {    //send a command byte to LCD 
    LCD_A0P = 0;
    SPI_send(ch);
    delaya();
}
 
void LCD_data(unsigned char ch) {    //send a data byte to LCD data port
    LCD_A0P = 1;
    SPI_send(ch);
}
 
// print an ASCII code on LCD at current text position
void write_char(unsigned char ch)
{
unsigned char * fontptr, k;
    fontptr = font + (ch-0x20) * 5;       // get the font pattern, 8 by 5
    for(k=0; k<5; k++)
      LCD_data( *fontptr++);
}
 
 
// display a message at column x, row y
void write_msg_xy(unsigned char x, unsigned char y, unsigned char *chptr)
{
char * ptr;
    ptr = chptr;
    set_xy(x, y);
    while(*ptr)
      write_char(*ptr++);
}
 
void plot_xy(unsigned char x, unsigned char y)  // draw a dot at position x, y, x: 0 to 127, y:0 to 63
{
char ypage, dd=1;
    ypage = y >>3;
    set_xy(x, ypage);
    ypage = y & 0x7; //low 3 bits for dot position
    dd = dd << ypage;
      LCD_data(dd);
}
 
 
// set LCD display position
void set_xy(unsigned char x, unsigned char y)
{
    LCD_command(0x10 | ( x>> 4) & 0x07  );  // lower 4 bits for high nibble of column address, 0 to 127
    LCD_command(0x00 | x & 0x0F);   // lower 4 bits for low nibble of column address
    LCD_command(0xB0 | y & 0x07);  // set page address, B0 to B7 for 8 pages
}
 
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++