Other Parts Discussed in Thread: MSP430G2453
I am using MSP430G2453 microcontroller on UART communication. The UART has been set as 115200-8-N-1 and interrupt module. I found there are times where the UART can't receive any massage, but can still send messages, after MCU worked several hours. This issue doesn’t always happen since I have 8 boards and only 2 boards have this issue.
void Init_UART(void)
{
P1SEL |= BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
P1SEL2 |= BIT1 + BIT2;
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 =69; // 8MHz 115200 See User GuideP435
UCA0BR1 = 0; // 8MHz 115200 ;
UCA0MCTL = 8; // Modulation UCBRSx = 0;
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
Rbuf_init (&RTbuf_UART0); //init ring buffer UART0
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
}
void sendstring(char * str)
{
Tx_str = str;
UART_TX_Int = TRUE;
IE2 |= UCA0TXIE; // Enable USCI_A0 TX interrupt
}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
uint8 data;
sioCirQueue_t *pRTbuf;
pRTbuf = &RTbuf_UART0;
data = UCA0RXBUF;
{
if (pRTbuf->lvl < RBUF_SIZE) // Handle circle buffer
{
pRTbuf->lvl++;
pRTbuf->buf[pRTbuf->pp] = data;
pRTbuf->pp = (pRTbuf->pp + 1) % RBUF_SIZE;
} else
{
pRTbuf->overflow = 1;
pRTbuf->cp = 0;
pRTbuf->pp = 0;
pRTbuf->lvl = 0;
pRTbuf->hiwtrmark = 0;
}
}
if ( data == 0x0D) //0x0d -> carriage return, \r; 0x0a->new line \n;
{
events |= RX_BT_MSG_EVENT;
__bic_SR_register_on_exit(LPM3_bits); // Exit active CPU, polling
}
}
Thanks for any help,
Kevin
