UART on Launchpad

NIKET AGRAWAL said:

...there seems no output on the TERMINAL window of CCS(version 5).I am running the sample codes I got for MSP430g2553 on launchpad.

View > Other > Terminal > Terminal

.

.

This output is correct.  "W" corresponds to 87 °F since W is decimal 87 in the ASCII table.  This sequence shows the temperature rise and then fall.

NIKET AGRAWAL said:

Which terminal to use(other than Hyperterminal)?

Any is fine.  This preference is up to you.  Here are the terminal programs I use:

Code Composer Studio > View > Other > Terminal > Terminal
Putty
HTerm
TeraTerm

Here is how it looks on TeraTerm

This is my setup:

Hardware: MSP-EXP430G2
Device: MSP430G2553
IDE: Code Composer Studio  Version: 5.3.0.00090
Firmware: C:\MSP430_LaunchPad\Solutions\Lab2\Files\Temperature_Sense_Demo.txt
    Getting Started with the MSP430 LaunchPad Workshop
    Find, "The installation file for the workshop labs"
    Make a new project and run Lab2

You can also verify the UART communication using the GUI for that project.

Hi,

I tired the exact steps you mentioned but it doesnt work for me. I tried opening the terminal before but it shows nothing. Then I hunted down the problem further and read in one of the forums that the INFO_A segment should not be deleted and sometimes if it is DCO might not work as expected and hence the Baud Rate might be messed up. I don't remember deleting the INFO_A segment. (I even checked the project properties and it says "Erase Main memory only". )

Then,  I ran the DCO Calibration file found in (C:\..\MSP430G2xx3_Code_Examples\C\msp430g2xx3_dco_flashcal.c). However when I run that code, the LEDs ( 1 and 2) on the launchpad keep blinking indicating that the code doesn't come out of the Set_DCO(16Mhz) function. I am not sure what the exact problem is and I am stuck at this place. Can you please help me?

First step is to check if you can echo the bytes sent from PC to device by shortening Tx and Rx on your board.

Regards,
Maciej 

NIKET AGRAWAL said:

there seems to be no output when I run the similar code on launchpad!

On older LaunchPad revisions, the G2553 cannot be used this way, as the jumpers do not allow swapping RX and TX.

Hello Ti employees,

I also have the same problem. Here is my initial UART. Does it make sense? I want to have baudrate=115200, 8 bit data, none parity. However, I sendByte('2') to Hercules or Terminal console, the result is not '2'.

Can you help me?

///////

void initUart()
{
  // Configure UART pins P3.4 & P3.5
  UART_PORT0 |= UART_PIN4 + UART_PIN5;
      // Configure UART 0
  UCA0CTL1 |= UCSWRST;
  UCA0CTL1 |= UCSSEL_2;                      // Set SMCLK as UCLk
  UCA0BR0 = 8;                              // 115200 baud
  // 16000000/(115200*16) - INT(16000000/(115200*16))=
  UCA0BR1 = 0;
  // UCBRFx = 11, UCBRSx = 0, UCOS16 = 1 (Refer User Guide)
  UCA0MCTL = 0xB1;
  UCA0CTL1 &= ~UCSWRST;                     // release from reset

//  memset(uartRXBuf,0,sizeof(uartRXBuf));
}

int main(void)
{
//  int i;
  WDTCTL = WDTPW + WDTHOLD;                 // Stop Watchdog Timer

  DCOCTL = 0;                               // Select lowest DCOx and MODx settings
  BCSCTL1 = CALBC1_16MHZ;                   // Set DCO to 8MHz
  DCOCTL = CALDCO_16MHZ;
//  P2OUT |= 0X00;
 // P2DIR |= 0x08;

  initUart();

  sendByte('2');
   while(1)
  {
  }  
}

//////

MaciejKucia said:

By the way I think that launchpad will work with only up to 9600. 

However, without a stable clock source, higher baudrates aren't taht reliable. And the G series only supports the 32768Hz crystal. (great for MIDI interface, but not for 115200Bd serial connections)

Jens-Michael Gross said:

And the G series only supports the 32768Hz crystal. (great for MIDI interface, but not for 115200Bd serial connections)

32768Hz crystal is good for DCO runtime calibration which then can be used for 115200Bd serial connections.

Hello,

I am using MSP430f249 not G series. When I sent a byte 'c' to buffer TX pin, hercules received another character. Something mistakes in my code.

Thank you so much!

lau lau said:

I am using MSP430f249 not G series.

But now that you hijacked this thread, you should provide soem information. We now know that you're using the F249, but we still don't know how you connected this F249 to the rest of the world. What kind of PCB are you using? An experimenters board or an own build? How did you connect the F249 to the PC? What else can you tell? What do you want to do, what did you do (whcih is often enough different), what did you expect and what do you get instead?

lau lau said:

  BCSCTL1 = CALBC1_16MHZ;                   // Set DCO to 8MHz

lau lau said:

When I sent a byte 'c' to buffer TX pin
[...]
sendByte('2');

And what is sendByte? You didn't post this (important, not only because suggested by yourself as possibly faulty) part of your code.

lau lau said:

hercules received another character.

Here is specific experiment. I matched initialUART with hercules HW below. However, I send '2' from msp430f249 to host computer via bridge UART_To_USB, hercules window received 'š' instead of '2'. why didn't computer received '2'. Something wrong in initial UART or any else?

//////////////////////

void initUart()
{
  // Configure UART pins P3.4 & P3.5
  UART_PORT0 |= UART_PIN4 + UART_PIN5;
      // Configure UART 0
  UCA0CTL1 |= UCSWRST;
  UCA0CTL1 |= UCSSEL_2;                      // Set SMCLK as UCLk

  UCA0BR0 = 8;                              // 115200 baud
  // 16000000/(115200*16) - INT(16000000/(115200*16))=
  UCA0BR1 = 0;
  // UCBRFx = 11, UCBRSx = 0, UCOS16 = 1 (Refer User Guide)
  UCA0MCTL = 0xB1;
//  UCA0IE |= UCRXIE;                         // Enable RX interrupt

  UCA0CTL1 &= ~UCSWRST;                     // release from reset

//  memset(uartRXBuf,0,sizeof(uartRXBuf));
}

//*****************************************************************************
//
//!  \brief Sends a string of characters using the UART module
//!
//!  \param  msg is pointer to the null terminated string to be sent
//!
//!  \return none
//
//*****************************************************************************
void sendString(char * msg)
{
  unsigned int i = 0;
//  char str[20];
//  memset(str,0,sizeof(str));
//  itoa(msg[1],str,10);

  for(i = 0; i < strlen(msg); i++)
  {
    while (!(IFG2&UCA0TXIFG));             // USCI_A0 TX buffer ready?
    UCA0TXBUF = msg[i];
  }
}

//*****************************************************************************
//
//!  \brief Sends a byte
//!
//!  \param  b is the byte to be sent through UART
//!
//!  \return none
//
//*****************************************************************************
void sendByte(char b)
{
    while (!(IFG2&UCA0TXIFG));             // USCI_A0 TX buffer ready?
    UCA0TXBUF = b;
}

int main(void)
{
//  int i;
  WDTCTL = WDTPW + WDTHOLD;                 // Stop Watchdog Timer

  DCOCTL = 0;                               // Select lowest DCOx and MODx settings
  BCSCTL1 = CALBC1_16MHZ;                   // Set DCO to 16MHz
  DCOCTL = CALDCO_16MHZ;
//  P2OUT |= 0X00;
  P2DIR |= 0x08;

  initUart();

  sendByte('2');
  P2OUT |= 0X08;
  while(1)
  {
  }  
}
////////////////////////

anybody can help me deal with this problem?