I have loaded the example code from the slac491.zip and tried to use the uart_03 example. I am using the 5739 exp board that contains the accel, ntc, and emulation section with the UART back port. the FRAM_GUI recognizes the board when plugged in but the dash board does not indicated any data. I then attempted to attach a tera term at 9600 baud and got nothing as well as no break point occurring at the interrupt handler switch case. So is the back port not accessible? Or do I have to do something special to use it? If then how does the FRAM GUI use it? Here is the code:
#include <msp430.h>
unsigned int i;
unsigned char RXData = 0;
unsigned char TXData = 0;
unsigned char check = 0;
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // stop watchdog
// XT1 Setup
PJSEL0 |= BIT4 + BIT5;
CSCTL0_H = 0xA5;
CSCTL1 |= DCOFSEL0 + DCOFSEL1; // Set max. DCO setting
CSCTL2 = SELA_0 + SELS_3 + SELM_3; // set ACLK = XT1; MCLK = DCO
CSCTL3 = DIVA_0 + DIVS_3 + DIVM_3; // set all dividers
CSCTL4 |= XT1DRIVE_0;
CSCTL4 &= ~XT1OFF;
do
{
CSCTL5 &= ~XT1OFFG;
// Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
// Configure UART pins
P2SEL1 |= BIT0 + BIT1;
P2SEL0 &= ~(BIT0 + BIT1);
// Configure UART 0
UCA0CTL1 |= UCSWRST;
UCA0CTL1 = UCSSEL_1; // Set ACLK = 32768 as UCBRCLK
UCA0BR0 = 3; // 9600 baud
UCA0BR1 = 0;
UCA0MCTLW |= 0x5300; // 32768/9600 - INT(32768/9600)=0.41
// UCBRSx value = 0x53 (See UG)
UCA0CTL1 &= ~UCSWRST; // release from reset
UCA0IE |= UCRXIE; // Enable RX interrupt
// __bis_SR_register(LPM0_bits + GIE); // LPM3 + Enable interrupt
_enable_interrupts();
while(1) {}
}
// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
{
switch(__even_in_range(UCA0IV,0x08))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
break;
case 4:break; // Vector 4 - TXIFG
default: break;
}
}
