Texas Instruments MSP430

376
* UCSWRST -- Enabled. USCI logic held in reset state
*
* Note: ~<BIT> indicates that <BIT> has value zero
*/
UCA0CTL1 = UCSSEL_2 | UCSWRST;
/*
* Modulation Control Register
*
* UCBRF_0 -- First stage 0
* UCBRS_1 -- Second stage 1
* ~UCOS16 -- Disabled
*
* Note: ~UCOS16 indicates that UCOS16 has value zero
*/
UCA0MCTL = UCBRF_0 | UCBRS_1;
/* Baud rate control register 0 */
UCA0BR0 = 104;
/* Enable USCI */
UCA0CTL1 &= ~UCSWRST;
Right after initialization of all required hardware, the UART starts sending some strings.
UART_puts("\f");
UART_puts("MSP430G2553 UART Demo\n");
UART_puts("Shawon Shahryiar\n");
UART_puts("https://www.facebook.com/MicroArena\n");
The following functions transmit data via UART. The first one can transmit one character at a time
while the second can transmit a string of characters. In both cases, it is checked if the last character
has been successfully sent before sending a new character.
void UART_putc(char ch)
{
while(!(IFG2 & UCA0TXIFG));
UCA0TXBUF = ch;
}
void UART_puts(char *str)
{
while(*str != 0)
{
while(!(IFG2 & UCA0TXIFG));
UCA0TXBUF = *str++;
};
}
Since data recption interrupt is used, data received is extracted from UART reception ISR.
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR_HOOK(void)
{
rx = UCA0RXBUF;
}