When we enable both UART1 and UART0 we can’t transmit (nothing is seen on the putty) on UART0. However, we comment enabling UART 1, then we can see what is transmitted on UART0 (can see it on Putty). However, when both are enabled we can see what is transmitted in UART1. Any ideas?
Thanks
#define UART_MODE SMCLK_9600
char wel[] = "Welcome to serial programming";
void initClockTo1MHz()
{
if (CALBC1_1MHZ==0xFF) // If calibration constant erased
{
while(1); // do not load, trap CPU!!
}
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_1MHZ; // Set DCO
DCOCTL = CALDCO_1MHZ;
}
void initGPIO_UART0()
{
P3SEL = BIT4 | BIT5; //Set P3.4 as UART 0 TXD and P3.5 as UART 0 RXD
}
void initGPIO_UART1()
{
P3SEL = BIT6 | BIT7; //Set P3.6 as UART 1 TXD and P3.7 as UART 1 RXD
}
void init_UART0()
{
UCA0CTL1 |= UCSWRST; //put the state machine in RESET
UCA0CTL0 = 0; //select UART MODE NO PARITY 8 bits Asynchronous
#if (UART_MODE == SMCLK_9600)
UCA0CTL1 |= UCSSEL_2; //choose 1MHz SCLK
//Baud rate 9600 settings
UCA0BR0 = 104; //settings for 9600 baud
UCA0BR1 = 0;
UCA0MCTL = 2;
__delay_cycles(20000);
UCA0CTL1 &= ~UCSWRST; //put UART in operation mode
UC0IE |= UCA0RXIE; // Enable USCI_A1 RX interrupt
#elif (UART_MODE ==SMCLK_19200 )
UCA1CTL1 |= UCSSEL_2; //choose 1MHz SCLK
//Baud rate 19200 settings
UCA0BR0 = 52; //settings for 19200 baud
UCA0BR1 = 0;
UCA0MCTL = 0;
__delay_cycles(20000);
UCA0CTL1 &= ~UCSWRST; //put UART in operation mode
UC0IE |= UCA0RXIE; // Enable USCI_A1 RX interrupt
#endif
}
void init_UART1()
{
UCA1CTL1 |= UCSWRST; //put the state machine in RESET
UCA1CTL0 = 0; //select UART MODE NO PARITY 8 bits Asynchronous
#if (UART_MODE == SMCLK_9600)
UCA1CTL1 |= UCSSEL_2; //choose 1MHz SCLK
//Baud rate 9600 settings
UCA1BR0 = 104; //settings for 9600 baud
UCA1BR1 = 0;
UCA1MCTL = 2;
__delay_cycles(20000);
UCA1CTL1 &= ~UCSWRST; //put UART in operation mode
UC1IE |= UCA1RXIE; // Enable USCI_A1 RX interrupt
#elif (UART_MODE ==SMCLK_19200 )
UCA1CTL1 |= UCSSEL_2; //choose 1MHz SCLK
//Baud rate 19200 settings
UCA1BR0 = 52; //settings for 19200 baud
UCA1BR1 = 0;
UCA1MCTL = 0;
__delay_cycles(20000);
UCA1CTL1 &= ~UCSWRST; //put UART in operation mode
UC1IE |= UCA1RXIE; // Enable USCI_A1 RX interrupt
#endif
}
/*!
* \brief sends a character to UART
*
* @param c - chacater to be sent
*
*/
void sendCharUART1(char c)
{
while (!(UC1IFG&UCA1TXIFG)); // USCI_A1 TX buffer ready?
UCA1TXBUF = c;
}
/*!
* \brief sends the given set of bytes into UART0
*
* @param buf - pointer to a buffer which needs to be transmitted
* @param len - number of bytes in the buffer that needs to be transmitted
*
*/
void transmitPktUART0(char *buf, unsigned int len)
{
unsigned int i =0;
while (i<len){
UCA0TXBUF = buf[i];
while (UCA0STAT&UCBUSY );
i++;
}
UCA0TXBUF = 0x0a;
while (UCA0STAT&UCBUSY );
UCA0TXBUF = 0x0d;
while (UCA0STAT&UCBUSY );
}
/*!
* \brief sends the given set of bytes into UART1
*
* @param buf - pointer to a buffer which needs to be transmitted
* @param len - number of bytes in the buffer that needs to be transmitted
*
*/
void transmitPktUART1(char *buf, unsigned int len)
{
unsigned int i =0;
while (i<len){
UCA1TXBUF = buf[i];
while (UCA1STAT&UCBUSY );
i++;
}
UCA1TXBUF = 0x0a;
while (UCA1STAT&UCBUSY );
UCA1TXBUF = 0x0d;
while (UCA1STAT&UCBUSY );
}
int main(void)
{
volatile char i = 0;
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
initClockTo1MHz(); //initialize the clock
initGPIO_UART0(); //Initialize the GPIO port used for UART0
init_UART0(); //initialize the UART0
//initGPIO_UART1(); //Initialize the GPIO port used for UART1
//init_UART1(); //initialize the UART1
UC1IE = 0x01; //enable RX interrupt
transmitPktUART0(wel,10);
