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Trouble with UART sending

Chrishen
Prodigy 70 points
Other Parts Discussed in Thread: MSP430F1611

Hello

 I have trouble using the UART IF on MSP430F1611. I cant send any data (nor receive). The output just doesn’t do anything. Here is my used code for configuration and sending:

 int main(void)

{                       WDTCTL = WDTPW + WDTHOLD;   // Stop watchdog timer

                        reseterror();

                        IOselect();                        // Setup of IO config incl. P3OUT = 0x10; P3DIR = 0x1F; P3SEL = 0x03;

                        CLK_init();                       // Sets SMCLK to XT2CLK (7.3728MHz)

                        .

                        .

                        .

                        

                        // Configuration of UART:

                       

                        U0CTL |= SWRST;

 

                        ME1 |= UTXE0 + URXE0;                                         //Enable USART0 TXD / RXD

                        U0CTL |= CHAR;                                                       // 8 Bit operation

 

                       

                        U0TCTL |= SSEL0;                                                        // Set SSELx high to switch BRCLK to SMCLK

                        U0TCTL |= SSEL1;                                                        // Set SSELx high to switch BRCLK to SMCLK

                       

                        //Baudrate = 7.3728MHz / 768 = 9600; 768 = 0x0300

                        U0BR0 = 0x00;

                        U0BR1 = 0x03;

                        U0MCTL =0x00;

                       

                        U0CTL &= ~SWRST;

                       

                        IE1 |= URXIE0 + UTXIE0;                 // vs Rx&Tx interrupt

 

 

 

                        // Send Loop:

 

                        while(1)

                        {                      

                                                while(!(IFG1 & UTXIFG0));                                     //wait until USART0 TX buffer ready

                                                U0TXBUF = 0x61;

                                                while(!(IFG1 & UTXIFG0));                                     //wait until USART0 TX buffer ready

                                                U0TXBUF = 0x99;

                        }

}

 

I would be glad for any help.

 

Best regards

 

Chrishen

  • 0
    Intellectual 990 points

    I had a similar issue. What I discovered that some USB ports don't work with my UART communication. Have you tried the USB ports in the back of your computer? Also, try using the wireless sensor demo to test communication.

    -Hope this helps

  • 0 in reply to Isaac Puckett
    Prodigy 70 points

    No, I checked with a scope that the Tx Pin of the MSP is doing nothing at all.

  • 0 in reply to Chrishen
    Mastermind 7595 points

    check my modyfication:

    #include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

  P3SEL |= 0x30;                            // P3.4,5 = USART0 TXD/RXD


  BCSCTL1 &= ~XT2OFF;                       // XT2on

  do
  {
  IFG1 &= ~OFIFG;                           // Clear OSCFault flag
  for (i = 0xFF; i > 0; i--);               // Time for flag to set
  }
  while ((IFG1 & OFIFG));                   // OSCFault flag still set?

  BCSCTL2 |= SELM_2 + SELS;                 // MCLK = SMCLK = XT2 (safe)


  ME1 |= UTXE0 + URXE0;                     // Enable USART0 TXD/RXD
  UCTL0 |= CHAR;                            // 8-bit character
  UTCTL0 |= SSEL1;                          // UCLK = SMCLK
  UBR00 = 0x00;                             // 
  UBR10 = 0x03;                             //
  UMCTL0 = 0x00;                            // no modulation
  UCTL0 &= ~SWRST;                          // Initialize USART state machine

  while(1)
  {                      
       while(!(IFG1 & UTXIFG0));    // wait until USART0 TX buffer ready
       U0TXBUF = 0x61;

       while(!(IFG1 & UTXIFG0));     //wait until USART0 TX buffer ready
       U0TXBUF = 0x99;
   }


}

  • 0 in reply to Lukasz
    Prodigy 70 points

    S..t! Found the error, I mixed up

    P3SEL |= 0x03;

    instead of 

    P3SEL |= 0x30;

    Thanks for the fast answers.
  • 0 in reply to Chrishen
    Mastermind 7595 points

    exactlly, this is it,,,

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