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Changing UART port pin at runtime (CC1310)

Jayson Dulay
Prodigy 50 points
Other Parts Discussed in Thread: CC1310

Hello,

We have a CC1310 with the UART working nicely. I can see the RX & TX being set up with the following code:

/*

* ============================= UART begin ===================================

*/

/* Place into subsections to allow the TI linker to remove items properly */

#if defined(__TI_COMPILER_VERSION__)

#pragma DATA_SECTION(UART_config, ".const:UART_config")

#pragma DATA_SECTION(uartCC26XXHWAttrs, ".const:uartCC26XXHWAttrs")

#endif




/* Include drivers */

#include <ti/drivers/UART.h>

#include <ti/drivers/uart/UARTCC26XX.h>




/* UART objects */

UARTCC26XX_Object uartCC26XXObjects[CC1310_LAUNCHXL_UARTCOUNT];




/* UART hardware parameter structure, also used to assign UART pins */

const UARTCC26XX_HWAttrsV1 uartCC26XXHWAttrs[CC1310_LAUNCHXL_UARTCOUNT] = {

{

.baseAddr = UART0_BASE,

.powerMngrId = PowerCC26XX_PERIPH_UART0,

.intNum = INT_UART0_COMB,

.intPriority = ~0,

.swiPriority = 0,

.txPin = Board_UART_TX,

.rxPin = Board_UART_RX,

.ctsPin = PIN_UNASSIGNED,

.rtsPin = PIN_UNASSIGNED

}

};

/* UART configuration structure */

const UART_Config UART_config[] = {

{

.fxnTablePtr = &UARTCC26XX_fxnTable,

.object = &uartCC26XXObjects[0],

.hwAttrs = &uartCC26XXHWAttrs[0]

},

{NULL, NULL, NULL}

};

I understand that the CC1310 only has 1 UART.

My question is it possible to change TX pin on runtime?

For example, once powered on, I need the CC1310 to transmit a few commands on IOID_26. After those commands are sent, I want to change the TX pin to IOID_30. The TX pin will remain on IOID_30 till reset or till power is lost. Is it possible to achieve this operation? Please let me know.

Thanks in advance,

Jayson

  • 0
    TI__Mastermind 30830 points
    I believe this can be done, but you'll have to cheat a little to get there.

    1) remove the "const" from the uartCC26XXHWAttrs declaration so that you can overwrite the .txPin field within the hwAttrs.
    2) Call UART_close() after you're finished using the initial txPin configuration.
    3) Add something like this in your code:
    uartCC26XXHWAttrs[0].txPin = IOID30;
    4) Re-open the UART instance.

    Alan
  • 0 in reply to Alan DeMars
    Prodigy 50 points

    Easy enough. I tried this, but program execution fails as soon as I remove const from uartCC26XXHWAttrs declaration.

    To elaborate, the only code change is to remove const from uartCC26XXHWAttrs declaration. Compile is successful. When I press the debug button, I never get to main. All debug options are grayed out in CCS. The only options available is stop debugging, and reset. Placing the const keyword, I get to main no problem.

    Any other ideas?

  • 0 in reply to Jayson Dulay
    TI__Mastermind 30830 points
    Hmm. Try removing "const" from this line too:

    const UART_Config UART_config[] = {

    Alan
  • 0 in reply to Alan DeMars
    Prodigy 50 points
    Alan,

    I get the same result. The program fails to get into main in debug. Only options are reset and terminate (debugging). I can only get into main if const is there for:

    const UARTCC26XX_HWAttrsV1 uartCC26XXHWAttrs
    const UART_Config UART_config
  • 0 in reply to Jayson Dulay
    TI__Mastermind 30830 points
    Try removing these lines:

    #if defined(__TI_COMPILER_VERSION__)
    #pragma DATA_SECTION(UART_config, ".const:UART_config")
    #pragma DATA_SECTION(uartCC26XXHWAttrs, ".const:uartCC26XXHWAttrs")
    #endif

    They are sending a conflicting message to the linker.