nbt_lcd.c

tiMSP430F147体能监测设备源码

//      _   __ ____  ______     __    ______ ____     ______
//     / | / // __ )/_  __/    / /   / ____// __ \   / ____/
//    /  |/ // __  | / /      / /   / /    / / / /  / /
//   / /|  // /_/ / / /      / /___/ /___ / /_/ /_ / /___
//  /_/ |_//_____/ /_/______/_____/\____//_____/(_)\____/
//                   /_____/
// (c) 2003 Altium
// Started: 20.11.2003 Ch.Weimann
// LCD driver Routines for NanoBoard Tester
// 23.01.04 fixed bug in LCD_GotoXY that did not work properly for line 2


#include "hware.h"
#include "nbt_lcd.h"

void Delay10Us(unsigned char time)
{
  unsigned char i;                      // this is very imprecise but only used for
  for(i=0;i<FOSC/180000L;i++)           // non-critical delays
  {
     __asm( "NOP\n\t");
  }
}

void DelayMs(unsigned int time)
{
  register unsigned char i;
  while (time --)
    for(i=0; i<5; i++)
      Delay10Us(20);
}

static void LCD_WaitWhileBusy(unsigned int Del10Us)
{
#ifndef LCD_READ_BUSY_FLAG  
  if(Del10Us > 200)
    DelayMs(Del10Us/100);
  else
    Delay10Us(Del10Us);
#else
  while(LCD_CTRL_R & 0x80);       // wait for busy flag to be low
#endif

}

//----------------------------------------------------------------
// initialises the LCD controller
void LCD_Init(void)
{
  DelayMs(20);  // wait for more than 15ms after powerup
  LCD_CTRL_W = 0x38;  // Function set 8 Bit
  DelayMs(8);        // wait for another 8 ms
  LCD_CTRL_W = 0x38;  // Function set 8 Bit
  DelayMs(2);   // wait for another 2 ms
  LCD_CTRL_W = 0x38;  // Function set 8 Bit
  Delay10Us(10);
  LCD_CTRL_W = 0x38;  // Function set 8 Bit, 2 lines, 5X7 dots
  Delay10Us(10);
  LCD_CTRL_W = 0x06;  // Display Off, Cursor off, Blink off
  Delay10Us(10);
  LCD_CTRL_W = 0x0E;   // Display on, Cursor On
  LCD_WaitWhileBusy(1000);
  LCD_CTRL_W = 0x01;   // Clear Display
  LCD_WaitWhileBusy(17*100);       // This takes at least 1.64ms to execute
}

void LCD_SetBacklight(unsigned char On)
//-------------------------------------
// turns LCD Backlight on or off
{
  LCD_BACKLIGHT = On;
}

unsigned char LCD_GetBacklight(void)
//--------------------------------------
// returns state of LCD backlight
{
  return LCD_BACKLIGHT;
}

//------------------------------------------
// Clears the screen
void LCD_ClrScr(void)
{
  LCD_CTRL_W = 0x01;
  LCD_WaitWhileBusy(300);
}

//------------------------------------------------------------
// controls Cursor appearance
// Visible: 0     = no cursor
//          non-0 = cursor visible
// Blink  : 0     = don't blink
//          non-0 = cursor blinks
//------------------------------------------------------------
void LCD_SetCursor(unsigned char Visible, unsigned char Blink)
{
  register unsigned char data = 0x0C; // display on
  if(Visible) data |= 0x02;
  if(Blink)   data |= 0x01;
  LCD_CTRL_W = data;
  LCD_WaitWhileBusy(1000);
}

void LCD_GotoXY(unsigned char X, unsigned char Y)
//------------------------------------------------
{
  LCD_CTRL_W = 0x80 | (X + 0x40* Y);
  LCD_WaitWhileBusy(4*100);
}

void LCD_WriteChar(unsigned char c)
//-------------------------------------------------
{
  LCD_DATA_W = c;
  LCD_WaitWhileBusy(4);
}

// -------------------------------------------------------------------------------------------
// programs custom character bitpattern for one of 8 custom characters
// data points to an array of 8 characters making up the bitpattern of the custom character
// *data, bits 5..0 are visible only, the top row is *data, set bits are dark, lsb is on right
// -------------------------------------------------------------------------------------------
void LCD_SetCustomChar(unsigned char CharNo, const char * data)
{
  register unsigned char addr, i;
  if(CharNo > 7)
    return;
  addr = 0x40 + 8*CharNo;
  LCD_CTRL_W = addr;  // set CG address
  LCD_WaitWhileBusy(4);
  for(i=0;i<8;i++)
  {
    LCD_DATA_W = *data++;
    LCD_WaitWhileBusy(4);
  }
  LCD_GotoXY(0,0);  // set DD ram Address again
}