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From: Oskar on 21 Apr 2008 13:10
Hi,

I'm trying to clock the CPU (MSP430F1611) to 8,000,000 Hz and I've run
into
some problems. Making the CPU to actually run at 8MHz was easy enough:

DCOCTL = DCO0 + DCO1 + DCO2; /* 0xE0 */
BCSCTL1 = XT2OFF + RSEL0 + RSEL1 + RSEL2; /* 0x87 */

However, the UART1 stopped working. What I've got so far is:

void uart1_init( unsigned int ubr )
{
/* RS232 */
P3DIR &= ~0x80; /* Select P37 for input (UART1RX) */
P3DIR |= 0x40; /* Select P36 for output (UART1TX) */
P3SEL |= 0xC0; /* Select P36,P37 for UART1{TX,RX} */

UCTL1 = SWRST | CHAR; /* 8-bit character, UART mode */

U1RCTL &= ~URXEIE; /* even erroneous characters trigger
interrupts */

UTCTL1 = SSEL1; /* UCLK = MCLK */

/* ubr is 8000000/baud */
UBR01 = ubr; /* assuming 19200 bps: UBR01 = 0xA0; */
UBR11 = ubr >> 8; /* assuming 19200 bps: UBR11 = 0x01; */

/* UMCTL1 calculated using http://mspgcc.sourceforge.net/baudrate.html
*/
UMCTL = 0x5B; /* assuming 19200 bps */

ME2 &= ~USPIE1; /* USART1 SPI module disable */
ME2 |= ( UTXE1 | URXE1 ); /* Enable USART1 TXD/RXD */

UCTL1 &= ~SWRST;

IE2 |= URXIE1; /* Enable USART1 RX interrupt */
}

What am I missing here? Any help appreciated!

--
Oskar
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