int main(void)
{
// configure WDT
WDTCTL = WDTPW | WDTHOLD; // stop watch dog timer
P1DIR |= _LED | _SCLK | _SDATA; // set all pins used to output
P1OUT &= ~(_LED | _SCLK | _SDATA); // set all outputs low
P1SEL |= _SCLK | _SDATA; // connect pins to USCI (secondary peripheral)
P1SEL2 |= _SCLK | _SDATA; // connect pins to USCI (secondary peripheral)
P2DIR |= _DISP | _SCS; // set all pins used to output
P2OUT &= ~(_DISP | _SCS); // set all outputs low
// configure UCSI B0 for SPI
UCB0CTL1 |= UCSWRST; // reset USCI B0
UCB0CTL0 = UCCKPH | UCMST | UCMODE_0 | UCSYNC; // read on rising edge, inactive clk low, lsb, 8 bit, master mode, 3 pin SPI, synchronous
UCB0BR0 = 8; UCB0BR1 = 0; // clock scaler = 8, i.e 2 MHz SPI clock
UCB0CTL1 = UCSSEL_2; // clock source SMCLK, clear UCSWRST to enable USCI B0
UCB0CTL1 &= ~UCSWRST; // enable USCI B0
// setup timer A, to keep time and alternate VCOM at 1Hz
timeMSec = 0; // initialize variables used by "clock"
timeSecond = 0;
timeMinute = 0;
VCOM = 0; // initialize VCOM, this flag controls LCD polarity
// and has to be toggled every second or so
TA0CTL = TASSEL_2 + MC_1; // SMCLK (default ~1MHz), up mode
TACCR0 = 1000; // trigger every millisecond
TACCTL0 |= CCIE; // timer 0 interrupt enabled
P2OUT |= _DISP; // turn display on
// initialize display
P2OUT |= _SCS; // SCS high, ready talking to display
SPIWriteByte(MLCD_CM | VCOM); // send clear display memory command
SPIWriteByte(0); // send command trailer
P2OUT &= ~_SCS; // SCS lo, finished talking to display
// write some text to display to demonstrate options
printSharp("HELLO,WORLD?",1,0);
printSharp(" SHARP",16,DISP_WIDE);
printSharp(" MEMORY ",24,DISP_INVERT);
printSharp(" DISPLAY!",32,DISP_HIGH);
printSharp("123456789012",56,0);
while(1)
{
// show VCOM state on LED1 for visual control
if(VCOM == 0)
{
P1OUT &= ~_LED;
}
else
{
P1OUT |= _LED;
}
// write clock to display
TextBuff[0] = ' ';
TextBuff[1] = timeMinute / 10 + '0';
TextBuff[2] = timeMinute % 10 + '0';
TextBuff[3] = ':';
TextBuff[4] = timeSecond / 10 + '0';
TextBuff[5] = timeSecond % 10 + '0';
TextBuff[6] = 0;
printSharp(TextBuff,72,DISP_HIGH | DISP_WIDE);
// put display into low-power static mode
P2OUT |= _SCS; // SCS high, ready talking to display
SPIWriteByte(MLCD_SM | VCOM); // send static mode command
SPIWriteByte(0); // send command trailer
P2OUT &= ~_SCS; // SCS lo, finished talking to display
// sleep for a while
_BIS_SR(LPM0_bits + GIE); // enable interrupts and go to sleep
};
}
int main(void)
{
// configure WDT
WDTCTL = WDTPW | WDTHOLD; // stop watch dog timer
P1DIR |= _LED | _DISP | _SCLK | _SDATA | _SCS; // set all pins used to output
P1OUT &= ~(_LED | _DISP | _SCLK | _SDATA | _SCS); // set all outputs low
// setup USI for SPI
USICTL0 = USIPE6 | USIPE5 | USILSB // enable SDO and SCLK, LSB sent first
| USIMST | USIOE; // master, enable data output
USICTL1 = USICKPH; // data captured on first edge
USICKCTL = USIDIV_1 | USISSEL_2; // /1 SMCLK (= default ~1MHz), clock low when inactive
// setup timer A, to keep time and alternate VCOM at 1Hz
timeMSec = 0; // initialize variables used by "clock"
timeSecond = 0;
timeMinute = 0;
VCOM = 0; // initialize VCOM, this flag controls LCD polarity
// and has to be toggled every second or so
TA0CTL = TASSEL_2 + MC_1; // SMCLK (default ~1MHz), up mode
TACCR0 = 1000; // trigger every millisecond
TACCTL0 |= CCIE; // timer 0 interrupt enabled
P1OUT |= _DISP; // turn display on
// initialize display
P1OUT |= _SCS; // SCS high, ready talking to display
SPIWriteByte(MLCD_CM | VCOM); // send clear display memory command
SPIWriteByte(0); // send command trailer
P1OUT &= ~_SCS; // SCS lo, finished talking to display
// write some text to display to demonstrate options
printSharp("HELLO,WORLD?",1,0);
printSharp(" SHARP",16,DISP_WIDE);
printSharp(" MEMORY ",24,DISP_INVERT);
printSharp(" DISPLAY!",32,DISP_HIGH);
printSharp("123456789012",56,0);
while(1)
{
// show VCOM state on LED1 for visual control
if(VCOM == 0)
{
P1OUT &= ~_LED;
}
else
{
P1OUT |= _LED;
}
// write clock to display
TextBuff[0] = ' ';
TextBuff[1] = timeMinute / 10 + '0';
TextBuff[2] = timeMinute % 10 + '0';
TextBuff[3] = ':';
TextBuff[4] = timeSecond / 10 + '0';
TextBuff[5] = timeSecond % 10 + '0';
TextBuff[6] = 0;
printSharp(TextBuff,72,DISP_HIGH | DISP_WIDE);
// put display into low-power static mode
P1OUT |= _SCS; // SCS high, ready talking to display
SPIWriteByte(MLCD_SM | VCOM); // send static mode command
SPIWriteByte(0); // send command trailer
P1OUT &= ~_SCS; // SCS lo, finished talking to display
// sleep for a while
_BIS_SR(LPM0_bits + GIE); // enable interrupts and go to sleep
};
}