fet440_lcd_02.c

MSP430F43x, MSP430F44x.zip c语言 例程

//*****************************************************************************
//  MSP-FET430P440 Demo - LCD, Displays Numbers on a Static LCD
//
//  Description: This program displays a 3.5 digit number on a static LCD
//  then waits in low power mode 3. The leading digit must be '1', nothing
//  else will display.  To use the program enter a 3.5 digit BCD
//  (characters 0-9) number in the program for the interger 'value'.
//  Download the program and run it.
//  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
//  //* An external watch crystal between XIN & XOUT is required for ACLK *//	
//
//
//                                 Connections MSP430 -> LCD
//                                 -------------------------
//
//                                T.I.               Varitronix
//                           MSP430x44x MCU     3.5 digit, static LCD
//                                                 # VI-302-DP-S
//                           ---------------       --------------
//                          |          COM0 |-----|1,40 COM      |
//                          |          SEG0 |-----|21            |
//                          |          SEG1 |-----|20            |
//                          |          SEG2 |-----|19            |
//                          |          SEG3 |-----|18            |
//                          |          SEG4 |-----|17            |
//                          |          SEG5 |-----|22            |
//                          |          SEG6 |-----|23            |
//                          |          SEG7 |-----|38 (low batt) |
//                          |          SEG8 |-----|25            |
//                          |          SEG9 |-----|24            |
//                          |          SEG10|-----|15            |
//                          |          SEG11|-----|14            |
//                          |          SEG12|-----|13            |
//                          |          SEG13|-----|26            |
//                          |          SEG14|-----|27            |
//                          |          SEG15|-----|28 (L)  COLON |
//                          |          SEG16|-----|30            |
//                          |          SEG17|-----|29            |
//                          |          SEG18|-----|11            |
//                          |          SEG19|-----|10            |
//                       ---|R03       SEG20|-----|9             |
//                      |   |          SEG21|-----|31            |
//                      |   |          SEG22|-----|32            |
//                     \|/  |          SEG23|-----|3 (B-C) =     |
//                     GND  |               |     | .5 digit ="1"|
//                           ---------------       --------------
//
//                 NOTE: Pin R03 on the MSP430 must be connected to GND
//
//  G. Morton / H. Grewal
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.21A
//*****************************************************************************
#include  <msp430x44x.h>

// Variable declaration
unsigned int value = 0x1789;// Number to display, range = 0-1999 = max display
                            // NOTE: DO NOT use leading zeros
unsigned int h;
unsigned int i;
unsigned int dig_pntr;
char *LCD = LCDMEM;


// Array declaration
const char digit[40] =
{
  0x11, 0x11,  // "0"    LCD segments a+b & c+d = lower two bytes
  0x11, 0x00,  // "0"    LCD segments e+f & g+h = upper two bytes
  0x10, 0x01,  // "1"
  0x00, 0x00,  // "1"
  0x11, 0x10,  // "2"
  0x01, 0x01,  // "2"
  0x11, 0x11,  // "3"
  0x00, 0x01,  // "3"
  0x10, 0x01,  // "4"
  0x10, 0x01,  // "4"
  0x01, 0x11,  // "5"
  0x10, 0x01,  // "5"
  0x01, 0x11,  // "6"
  0x11, 0x01,  // "6"
  0x11, 0x01,  // "7"
  0x00, 0x00,  // "7"
  0x11, 0x11,  // "8"
  0x11, 0x01,  // "8"
  0x11, 0x11,  // "9"
  0x10, 0x01,  // "9"
};


void main(void)
{
  volatile unsigned int i;                  // Use volatile to prevent removal
                                            // by compiler optimization

  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  FLL_CTL0 |= XCAP14PF;                     // Configure load caps
  for (i = 0; i < 10000; i++);              // Delay for 32 kHz crystal to
                                            // stabilize

  LCDCTL = LCDSG0_3 + LCDSTATIC + LCDON;    // Static LCD, segments S0-S23
  BTCTL  = BT_fLCD_DIV256;                  // LCD clock freq is ACLK/256

  P1DIR = 0xFF;                             // Set P1.0-7 as outputs
  P2DIR = 0xFF;                             // Set P2.0-7 as outputs
  P3DIR = 0xFF;                             // Set P3.0-7 as outputs
  P4DIR = 0xFF;                             // Set P4.0-7 as outputs
  P5DIR = 0xFF;                             // Set P5.0-7 as outputs
  P6DIR = 0xFF;                             // Set P6.0-7 as outputs


  // Clear LCD memory to clear display
  for (i=0; i<20; i++)
  {
    LCD[i] = 0;
  }

  // Display lower 3 digits
  for (h=0; h<3; h++)
  {
    dig_pntr = (value & 0xF) << 2;          // Set pointer to start of digit
                                            // in table

    // Loop to load 4 bytes of digit
    for (i=0; i<4; i++)
    {
      LCD[i] = digit[dig_pntr++];           // Byte of digit to byte of
                                            // LCD memory and increment to
                                            // next byte of digit
    }

    value >>= 4;                            // Shifts value right to display
                                            // next character
    LCD += 4;                               // Increment by 4 for next
                                            // character location
  }

  // Test for leading 1 and display if present
  if (value == 1)
  {
    LCDM12 |= 0x10;                         // Set bit = leading 1
  }

  LPM3;                                     // Enter LPM3
}