Hi,
I've successfully run a modified UART code examples found at this site. It uses UART0 of my device (an MSP430F5438) and blink a LED each time a new character goes into the RX buffer. But when I try changing the code to use UART1 something happens and the LED stop blinking, can you see what I've done wrong / forgot?
#include "msp430x54x.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P4DIR |= 0x0f; // Set P4.0-3 to output direction
P4SEL |= 0x00; // I/O function selected for the pins
P5SEL |= 0xc0;//0x30; // P5.6,7 USCI_A1 TXD/RXD // P3.4,5 = USCI_A0 TXD/RXD
UCA1CTL1 |= UCSWRST; // **Put state machine in reset**
UCA1CTL1 |= UCSSEL_2; // SMCLK
UCA1BR0 = 6; // 1MHz 9600 (see User's Guide)
UCA1BR1 = 0; // 1MHz 9600
UCA1MCTL = UCBRS_0 + UCBRF_13 + UCOS16; // Modln UCBRSx=0, UCBRFx=0,
// over sampling
UCA1CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA1IE |= UCRXIE; // Enable USCI_A1 RX interrupt
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
__no_operation(); // For debugger
}
// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCI_A1_VECTOR
__interrupt void USCI_A1_ISR(void)
{
switch(__even_in_range(UCA1IV,4))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
while (!(UCA1IFG&UCTXIFG)); // USCI_A1 TX buffer ready?
P4OUT ^= 0x04; // Toggle P4.1 using exclusive-OR
//UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
break;
case 4:break; // Vector 4 - TXIFG
default: break;
}
}
BR Adde
