CCS/MSP430F249: uart0 + uart1

Part Number: MSP430F249

Tool/software: Code Composer Studio

Hello,

I tried this uart uca0 code from the Ti examples and it won't work I don't know why!! the uca1 worked, but I need to work on uca0

the code I tried:

#include <msp430.h>

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR = 0xFF; // All P1.x outputs
P1OUT = 0; // All P1.x reset
P2DIR = 0xFF; // All P2.x outputs
P2OUT = 0; // All P2.x reset
P3SEL = 0x30; // P3.4,5 = USCI_A0 TXD/RXD
P3DIR = 0xFF; // All P3.x outputs
P3OUT = 0; // All P3.x reset
P4DIR = 0xFF; // All P4.x outputs
P4OUT = 0; // All P4.x reset
P5DIR = 0xFF; // All P5.x outputs
P5OUT = 0; // All P5.x reset
P6DIR = 0xFF; // All P6.x outputs
P6OUT = 0; // All P6.x reset

UCA0CTL1 |= UCSSEL_1; // CLK = ACLK
UCA0BR0 = 0x03; // 32kHz/9600 = 3.41
UCA0BR1 = 0x00; //
UCA0MCTL = UCBRS1 + UCBRS0; // Modulation UCBRSx = 3
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt

__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, interrupts enabled
}

// Echo back RXed character, confirm TX buffer is ready first
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCIAB0RX_VECTOR))) USCI0RX_ISR (void)
#else
#error Compiler not supported!
#endif
{
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
}

thanks alot

Hi Rena, 

Rena A said:

I need to receive in UCA0 pin 3.5 and transmit in UCA1 pin 3.6

You're trying to use a different USCI module for transmit and receive? This is an uncommon use of the USCI modules. Typically, you would just use one module for both TX and RX. Can you not use P3.5 as RX and P3.4 as TX?

I also recommend reading the UART and General sections of Solutions to Common eUSCI and USCI Serial Communication Issues on MSP430 MCUs.

Best regards, 
Caleb Overbay

Hi Caleb,

the board wouldn't work on pins 3.4/5, also the main board I'll use is defined to be Tx on p3.6 and Tr on p3.5, 

I saw that it's possible on other boards families, I just don't know if it's possible in the msp430f249 !