Compiler/LAUNCHXL-CC2650: Using UART_write() to print

Rathna

Part Number: LAUNCHXL-CC2650
Other Parts Discussed in Thread: CC2650

Tool/software: TI C/C++ Compiler

Hello,

I am using cc2650 Launch pad with simple Peripheral example to print some data as Char values. I am able to do that, but I also want to print the data on COM port using UART_write() function.

I tried to print data using UART_echo example as a reference. In main.c file of simple_ble_peripheral example I added

    UART_Handle uart;
    UART_Params uartParams;
    const char print[] = "\fPrinting data\r\n";

    UART_Params_init(&uartParams);
    uartParams.writeDataMode = UART_DATA_BINARY;

    uartParams.baudRate = 9600;
    uart = UART_open(Board_UART0, &uartParams);

    UART_write(uart, print, sizeof(print));

It successfully prints "Printing data" on comport, but if I try to print anything else using UART_write(), it does not print anything. Is there a way to print integers, array using UART_write()?

Also, how can I implement UART print function inside the application? I tried doing it but didn't work for me.

Please let me know how to use UART_write() or any other function to print the necessary data on COM Port within the application.

Thank you,

Rathna

over 6 years ago

0 YiKai Chen over 6 years ago

Guru 735685 points

To print integers, array using UART_write, do can use sprintf to format integers/array contents into a buffer and use UART_write to print the buffer.

0 Rathna over 6 years ago in reply to YiKai Chen

Intellectual 670 points

int data[] = {12, 345, 6789, 101112};
char buff[128], *pos = buff;
for (int i = 0 ; i != 4 ; i++) {
    if (i) {
        pos += sprintf(pos, ", ");
    }
    pos += sprintf(pos, "%d", data[i]);
}

UART_write(uart, buff, sizeof(buff));

Thank you for the response. So, if I do this, will it print? Or are you suggesting something else?

Also let me know if you know how I can do it inside the application.

Regards

0 YiKai Chen over 6 years ago in reply to Rathna

Guru 735685 points

You can check contents in buff after doing sprintf. If that’s what you want, it’s OK to use UART_write to print it it.

0 Rathna over 6 years ago in reply to YiKai Chen

Intellectual 670 points

I am able to do it when I use it in the main.c file. But, if I use it anywhere else in the application, I don't see anything printing on the screen.
Do you have any idea how to go about that?

Thanks,
Rathna

0 YiKai Chen over 6 years ago in reply to Rathna

Guru 735685 points

Can you elaborate where you put UART_write and it doesn't work?

0 Rathna over 6 years ago in reply to YiKai Chen

Intellectual 670 points

Inside

static void SimpleBLEPeripheral_taskFxn(UArg a0, UArg a1)

0 YiKai Chen over 6 years ago in reply to Rathna

Guru 735685 points

I test the following code in SimpleBLEPeripheral_taskFxn and I can see UART output without problem. Make sure you call UART_init in your code before you use other UART APIs.

UART_Handle uart;
UART_Params uartParams;
const char echoPrompt[] = "\fSimpleBLEPeripheral_taskFxn:\r\n";
static void SimpleBLEPeripheral_taskFxn(UArg a0, UArg a1)
{
// Initialize application
SimpleBLEPeripheral_init();
UART_init();
/* Create a UART with data processing off. */
UART_Params_init(&uartParams);
uartParams.writeDataMode = UART_DATA_BINARY;
uartParams.readDataMode = UART_DATA_BINARY;
uartParams.readReturnMode = UART_RETURN_FULL;
uartParams.readEcho = UART_ECHO_OFF;
uartParams.baudRate = 115200;
uart = UART_open(Board_UART0, &uartParams);

if (uart != NULL) {
      UART_write(uart, echoPrompt, sizeof(echoPrompt));
}
// Application main loop
for (;;)
{
    // Waits for a signal to the semaphore associated with the calling thread.
    // Note that the semaphore associated with a thread is signaled when a
    // message is queued to the message receive queue of the thread or when
    // ICall_signal() function is called onto the semaphore.
    ICall_Errno errno = ICall_wait(ICALL_TIMEOUT_FOREVER);

....

0 Rathna over 6 years ago in reply to YiKai Chen

Intellectual 670 points

It worked for me. Thank you so much, but I am facing another problem, I have connected to a different sensor from Launchpad, which has Rx_Tx connected to IOID_3, so when I try to change the pins in the Board.h file and get the UART messages, I don't see anything on COMport.

If you know of something that I could try, please let me know.

Thanks,
Rathna

0 YiKai Chen over 6 years ago in reply to Rathna

Guru 735685 points

I couldn’t understand your latest descriptions and question. Can you elaborate?

0 Siri over 6 years ago in reply to Rathna

TI__Guru* 86071 points

If you are using the CC2650 LP, UART_TX is connected to IOID_3, and you cannot change this without changing your HW.

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Compiler/LAUNCHXL-CC2650: Using UART_write() to print