YA.... UCBRSx is not defined in the example. When I add it to the if statement it just give me an error. Rightly so... As it is undefined. I am looking at section 36.3.13. Table 36-5 of SLAU208O and this is unclear how to implement it. Do I need to write it as USA1BRSx or is it just UCBRSx? I tried both...but both versions did not compile. Here is the code again.... Straight from the website. #include #include #include #define UART_PRINTF #ifdef UART_PRINTF int fputc(int _c, register FILE *_fp); int fputs(const char *_ptr, register FILE *_fp); #endif void main(void) { unsigned int counter=0; WDTCTL = WDTPW + WDTHOLD; // Stop WDT // initialize clock module P1DIR |= 0x01; // P1.0 output UCSCTL3 |= SELREF__REFOCLK; UCSCTL4 |= SELA__REFOCLK; // initialize Timer_A module TA1CCTL0 = CCIE; // CCR0 interrupt enabled TA1CCR0 = 32768; TA1CTL = TASSEL__ACLK + MC__UP + TACLR; // ACLK, up mode, clear TAR #ifdef UART_PRINTF // initialize USCI module P4SEL |= BIT4 + BIT5; // P4.4,5 = USCI_A1 TXD/RXD UCA1CTL1 |= UCSWRST; // **Put state machine in reset** UCA1CTL1 |= UCSSEL__ACLK; // AMCLK UCA1BR0 = 3; // 32,768kHz 1200 (see User's Guide), original example used 27, set to 3 for 9600 UCA1BR1 = 0; // 32,768kHz 1200, original example used 0, set to 3 for 9600 UCBRSx = 3; // This is just give me an error as it is undefined.! UCA1MCTL = UCBRS_2; // 32,768kHz 1200 UCA1CTL1 &= ~UCSWRST; // **Initialize USCI state machine** #endif while(1) { __bis_SR_register(LPM3_bits+GIE); // Enter LPM3, enable interrupts printf("Hello world %d!\r\n", counter++); } } // Timer A0 interrupt service routine #pragma vector=TIMER1_A0_VECTOR __interrupt void TIMER1_A0_ISR(void) { P1OUT ^= 0x01; // Toggle P1.0 __bic_SR_register_on_exit(LPM3_bits); } #ifdef UART_PRINTF int fputc(int _c, register FILE *_fp) { while(!(UCA1IFG&UCTXIFG)); UCA1TXBUF = (unsigned char) _c; return((unsigned char)_c); } int fputs(const char *_ptr, register FILE *_fp) { unsigned int i, len; len = strlen(_ptr); for(i=0 ; i<len ; i++) { while(!(UCA1IFG&UCTXIFG)); UCA1TXBUF = (unsigned char) _ptr[i]; } return len; } #endif
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