fg439_rtc.c

TI MSP430针对cap sense 按键的源码, 可实现单击或滑动键, 如IPOD上的人机接口.

#include <msp430xG43x.h>

char* LCD = LCDMEM;

const char digit[10] =
{
  0xB7,  // "0"    LCD segments a+b+c+d+e+f
  0x12,  // "1"
  0x8F,  // "2"
  0x1F,  // "3"
  0x3A,  // "4"
  0x3D,  // "5"
  0xBD,  // "6"
  0x13,  // "7"
  0xBF,  // "8"
  0x3F   // "9"
};

void main(void)
{
  int i;
  int rtc = 0;
  int value;

  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

  FLL_CTL0 |= DCOPLUS + XCAP14PF;           // DCO+ set, freq = xtal x D x N+1
  SCFI0 |= FN_4;                            // x2 DCO freq, 8MHz nominal DCO
  SCFQCTL = 31;                             // (31+1) x 32768 x 2 = 2.048 MHz

  IE2 |= BTIE;                              // Enable BT interrupt

  P1DIR = 0xFF;                             // All P1.x outputs
  P1OUT = 0;                                // All P1.x reset
  P2DIR = 0xFF;                             // All P2.x outputs
  P2OUT = 0;                                // All P2.x reset
  P3DIR = 0xFF;                             // All P3.x outputs
  P3OUT = 0;                                // All P3.x reset
  P4DIR = 0xFF;                             // All P4.x outputs
  P4OUT = 0;                                // All P4.x reset
  P5DIR = 0xFF;                             // All P5.x outputs
  P5OUT = 0;                                // All P5.x reset
  P6DIR = 0xFF;                             // All P6.x outputs
  P6OUT = 0;                                // All P6.x reset

  LCDCTL = LCDSG0_1 + LCD4MUX + LCDON;      // 4-Mux LCD, segments S0-S15
  BTCTL  = BT_fLCD_DIV128 | BT_ADLY_1000;   // LCD clock freq is ACLK/256
  P5SEL  = 0xFC;                            // Select P5.2-7 as Com and Rxx

  // Clear LCD memory to clear display
  for (i=0; i<19; i++)
  {
    LCD[i] = 0;
  }

  while(1)
  {
    int i;
    _BIS_SR(LPM3_bits + GIE);               // Enter LPM3 w/ interrupts
    rtc++;
    value = rtc;
    // Display contents of the variable value
    for (i=0; i<5; i++)
    {
      LCD[i] = digit[value%10];             // Remainder = character in table
                                            // to display
      value /= 10;                          // Shifts right so next character
                                            // can be displayed
    }
  }
}

// Basic Timer interrupt service routine
#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer(void)
{
    _BIC_SR_IRQ(LPM3_bits);                 // Clear LPM3 bits from 0(SR)
}