msp430x42x0_lcda_06.c

MSP430F42x0.zip c语言 例程打包

//******************************************************************************
//   MSP430x42x0 Demo - LCD_A run a 0-9 counter on TI LCD
//
//  Description; Count 0-9 on a TI LCD
//  ACLK = LFXT1 = 32768, MCLK = SMCLK = DCO = 32xACLK = 1.048576MHz
//  Segments attached in accordance with Static LCD diagram in 4xx User's Guide
//  //*An external watch crystal is required on XIN/XOUT for ACLK*//	
//  //* WARNING: Do NOT enable Charge Pump with Static LCD *//
//  //* See Errata for more details: LCDA1 *//
//               MSP430F4270
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |                 |    TI LCD
//           |             S0  |     -----
//           |              -  |--> | 2 1 |
//           |             S6  |     -----
//           |             COM0|-----|
//           |                 |
//           |                 |
//           |                 |
//           |                 |
//
//  L. Westlund / S. Karthikeyan
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.30A
//*****************************************************************************
#include  <msp430x42x0.h>

const char digit[40] =
{
  0x11, 0x11,  // '0'                   LCD segments b+a & d+c = lower two bytes
  0x11, 0x00,  // '0'                   LCD segments f+e & h+g = 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)
{
  int digit_ptr;
  int value = 0;
  int i;
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  FLL_CTL0 |= XCAP14PF;                     // Set load cap for 32k xtal
  LCDACTL = LCDON + LCDSTATIC + LCDFREQ_128;// 4mux LCD, ACLK/128
  LCDAPCTL0 = 0x03;                         // S0-S6 used

  for( i = 0; i < 20; i ++)
  {
    LCDMEM[i] = 0;                          // Clear LCD
  }

  for (;;)
  {
    volatile unsigned int index;
    digit_ptr = value << 2;
    for (index = 0; index < 4; index++)     // Load 4 bytes of digit
    {
      LCDMEM[index] = digit[digit_ptr++];   // Byte of digit to byte of
    }

    for( index = 0; index < 50000; index++ ){} // delay loop
    if( value == 9 )
    {
      value = 0;                            // Reset counter
    }
    else
    {
      value++;
    }

  }
}