I am having problem in receiving any char using the following code on
MSP430-449STK2 board from OLIMEX.
This code is as it is taken from example "fet440_usart01_19200" given
I have been struggling with this since ages.... :-(
Any help in this matter willbe appreciated.
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
FLL_CTL0 |= XCAP14PF; // Configure load caps
UTCTL0 = SSEL1; // UCLK = SMCLK
UBR00 = 0x36; // 1MHz 19200
UBR10 = 0x00; // 1MHz 19200
UMCTL0 = 0x00; // no modulation
UCTL0 = CHAR; // 8-bit character *SWRST*
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
IE1 |= URXIE0; // Enable USART0 RX interrupt
P2SEL |= 0x30; // P2.4,5 = USART0 TXD/RXD
P2DIR |= 0x10; // P2.4 output direction
_EINT(); // Enable interrupts
for (;;) //
_BIS_SR(CPUOFF); // Enter LPM0
_NOP(); // Required only for C-spy
interrupt[UART0RX_VECTOR] void usart0_rx (void)
while ((IFG1 & UTXIFG0) == 0); // USART0 TX buffer ready?
TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
Reply by Paul Burke●April 4, 20052005-04-04
> I am having problem in receiving any char using the following code on
> MSP430-449STK2 board from OLIMEX.
> This code is as it is taken from example "fet440_usart01_19200" given
> with IAR.
> I have been struggling with this since ages.... :-(
> Any help in this matter willbe appreciated.
I can't go into it in detail, but how about this for an approach:
(1) Take the character echo out of interrupt into a tight loop in
main(). That eliminates interrupt snafus. Remember to test for character
(2) Make it flash a LED when it receiuves a character. If it doesn't,
the problem is on the receive side (have you selected port alternate
(3) Use a scope to check that the character is getting to the board at
all, and if so, if anything at all comes out of the transmit port.