CC1310: Get current Epoch seconds on using USB/UART (custom hardware)

Hi Mirte,

Regarding below question. I hope I am understanding your question correctly. I would assume that you need an application running on the PC. You device could send a command over UART asking for the time. The PC application should upon receiving the command from the device, send the epoch time, and the device would read the time received over UART.

There are of course many ways to achieve this, but above is one suggestion. 

Mirte H said:

How can I get the local Epoch time from the connected PC using UART?

I have a question regarding below statement. Are you referring to the two lines of code above the statement or the (73 line) code in your the code block? What exactly is not working on your own hardware, and what is the error?

Mirte H said:

this only works on my CC1310 launchpad and not on my own hardware. (My hardware uses the CH340N usb to uart IC).

Thanks,

Nikolaj

Hi Nikolaj,

No, I don't think I need an application running on the PC, I think I stressed the UART part too much which makes the question confusing.

I want to retrieve the system time from a PC in C, and the only way my PCB is connected to a PC is with a USB cable using a CH340N driver. 

Nikolaj_G said:

I have a question regarding below statement. Are you referring to the two lines of code above the statement or the (73 line) code in your the code block? What exactly is not working on your own hardware, and what is the error?

The following lines of code:

 time_t t = time(NULL);
 struct tm tm = *localtime(&t);

Don't give me an error or anything on my hardware, it runs fine, but it returns januari first 1970, so basically 0. 

The code block I posted works, because I'm setting the seconds manually. But in my system I need to receive these seconds from the system time of the connected PC.

I don't know if i'm right, but I'm thinking perhaps the Windows.H library might be another option, do you know how I can import this in CCS?
(Or perhaps I'm wrong/you have a better idea , either way: I'm all ears! )

Kind regards,

Mirte H

Hi Nikolaj,

Loud and clear! Thanks for the great answer

I am now starting to try and get data from UART using realterm on my CC1310 Launchpad using the uartecho_nortos example.

This only reads and writes chars. do you have any idea how I can change this to receive and write integers (in my case it will be the epoch time)?

I've tried so many things but nothing works, because if i change input to anything but a char it won't work.

I put a code snippit, (which obviously doesn't work), below so you can get an idea of what i'm trying to do. If you can't help me I will close this thread and create a new one for this question.

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/*
 *  ======== uartecho.c ========
 */
#include <stdint.h>
#include <stddef.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/UART.h>

/* Example/Board Header files */
#include "Board.h"

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    char        input;
    const char  echoPrompt[] = "Echoing characters:\r\n";
    UART_Handle uart;
    UART_Params uartParams;
uint32_t received;
    /* Call driver init functions */
    GPIO_init();
    UART_init();

    /* Configure the LED pin */
    GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Turn on user LED */
    GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);

    /* 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_open() failed */
        while (1);
    }

    UART_write(uart, echoPrompt, sizeof(echoPrompt));

    /* Loop forever echoing */
    while (1) {
        UART_read(uart, &input, 1);
        UART_write(uart, &input, 1);
        received = &input;
        Seconds_set(received);
        // etc..
    }
}

Thanks again!

Mirte H

Thanks for the nice explanation Arthur! I managed to make my code work by looking at the received value byte by byte, and then shifting those bytes back into my integer