How to change CC26xx/CC13xx UART baudrate dynamically in your application.

The following steps show you how to change CC26xx/CC13xx UART baudrate dynamically in your application.

1. In port pininterrupt example into your CCS.

2. Add the following header files for UART and task related stuffs.

    #include <ti/sysbios/knl/Task.h>
    #include <ti/drivers/UART.h>
    #include <stdint.h>

3. Add the following defines and global variables for UART and task related stuffs.

    #define TASKSTACKSIZE     768
    uint32_t baudrate=115200;
    bool baudrate_change=false;
    UART_Handle uart;
    UART_Params uartParams;

    Task_Struct task0Struct;
    Char task0Stack[TASKSTACKSIZE];

4. Add the following red codes into buttonCallbackFxn to change baudrate when BTN1 is pressed.

            case Board_BUTTON1:
                currVal =  PIN_getOutputValue(Board_LED1);
                PIN_setOutputValue(ledPinHandle, Board_LED1, !currVal);
                if(baudrate==115200){
                    const char echoBaudrateChange[] = "\fChange Baudrate to 9600:\r\n";
                    UART_write(uart, echoBaudrateChange, sizeof(echoBaudrateChange));
                    baudrate=9600;
                }else{
                    const char echoBaudrateChange[] = "\fChange Baudrate to 115200:\r\n";
                    UART_write(uart, echoBaudrateChange, sizeof(echoBaudrateChange));
                    baudrate=115200;
                }
                baudrate_change=true;                break;


5. Add the following function echoFxn()

Void echoFxn(UArg arg0, UArg arg1)
{
    char input;
    const char echoPrompt[] = "\fEchoing characters:\r\n";

    /* Create a UART with data processing off. */
    UART_Params_init(&uartParams);

RESTART_UART:
    uartParams.writeDataMode = UART_DATA_BINARY;
    uartParams.readDataMode = UART_DATA_BINARY;
    uartParams.readReturnMode = UART_RETURN_FULL;
    uartParams.readEcho = UART_ECHO_OFF;
    uartParams.baudRate = baudrate;
    uart = UART_open(Board_UART0, &uartParams);

    if (uart == NULL) {
        System_abort("Error opening the UART");
    }

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

    /* Loop forever echoing */
    while (1) {
        if(baudrate_change){
            UART_close(uart);
            uart=NULL;
            baudrate_change=false;
            goto RESTART_UART;
        }
        UART_read(uart, &input, 1);
        UART_write(uart, &input, 1);
    }
}


6. Add the following red codes in main function to start UART task.

int main(void)
{
    Task_Params taskParams;
    /* Call board init functions */
    Board_initGeneral();
    Board_initUART();

    /* Construct BIOS objects */
    Task_Params_init(&taskParams);
    taskParams.stackSize = TASKSTACKSIZE;
    taskParams.stack = &task0Stack;
    Task_construct(&task0Struct, (Task_FuncPtr)echoFxn, &taskParams, NULL);...
}


7. Build and download firmware into LaunchPad to test it.

How to use internal temperature reading inside CC26xx/CC13xx

The following codes show you how to use internal temperature sensor reading inside CC26xx/CC13xx.

1. Add "#include DeviceFamily_constructPath(driverlib/aon_batmon.h)"

2. Use the following codes to do internal temperature sensor reading into curr_tmp.

    int32_t curr_tmp;
    AONBatMonEnable();
    curr_tmp=AONBatMonTemperatureGetDegC();
    AONBatMonDisable();

How to enable hex and float value output from System_printf in TI CC13xx/CC26xxx SDK.

The following steps show you how to enable hex and float value output from System_printf in TI CC13xx/CC26xxx SDK.

1. Add "System.extendedFormats = '%x%f%$L%$S%$F';" in your application ccfg such as app.cfg
2. Add "#include <xdc/runtime/System.h> in the beginning of C file.
3. You can use System_printf and %x/%f to print hex or float value now.

Use PWM_PERIOD_HZ/PWM_DUTY_FRACTION to generate PWM for TI CC26xx/CC13xx devices.

You can replace the following mainThread function call in pwmled2 example to use PWM_PERIOD_HZ/PWM_DUTY_FRACTION to generate PWM for TI CC26xx/CC13xx devices.



void *mainThread(void *arg0)
{
    /* Period and duty in microseconds */
    uint16_t   pwmPeriod = 1000; //1K Hz PWM
    uint16_t   pwmDutyRatio = 0; //Init PWM Duty Ratio
    uint16_t   pwmDutyRatioInc = 5; //PWM Duty Ratio increase every time
    uint16_t   pwmDutyRatioMax= 50; //Max PWM Duty Ratio

    pwmDutyRatio = (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100);

    /* Sleep time in microseconds */
    uint32_t   time = 50000;
    PWM_Handle pwm1 = NULL;
    PWM_Handle pwm2 = NULL;
    PWM_Params params;

    /* Call driver init functions. */
    PWM_init();

    PWM_Params_init(&params);
    params.dutyUnits = PWM_DUTY_FRACTION;
    params.dutyValue = (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100);
    params.periodUnits =  PWM_PERIOD_HZ;
    params.periodValue = pwmPeriod;
    pwm1 = PWM_open(Board_PWM0, &params);
    if (pwm1 == NULL) {
        /* Board_PWM0 did not open */
        while (1);
    }

    PWM_start(pwm1);

    pwm2 = PWM_open(Board_PWM1, &params);
    if (pwm2 == NULL) {
        /* Board_PWM0 did not open */
        while (1);
    }

    PWM_start(pwm2);

    /* Loop forever incrementing the PWM duty */
    while (1) {
        PWM_setDuty(pwm1, (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100));

        PWM_setDuty(pwm2, (uint32_t) (((uint64_t) PWM_DUTY_FRACTION_MAX * pwmDutyRatio) / 100));

        pwmDutyRatio = (pwmDutyRatio + pwmDutyRatioInc);

        if (pwmDutyRatio == pwmDutyRatioMax || (!pwmDutyRatio)) {
            pwmDutyRatioInc = - pwmDutyRatioInc;
        }

        usleep(time);
    }
}

How to detect button hold in CC26x2, CC13x0, CC13x2 SDK.

The following steps show you how to detect button hold in CC26x2, CC13x0, CC13x2 SDK. I use zed_switch example to add related code to detect if right button (active-low) is pressed (low status) and hold for 3 seconds.

1. In board_key.c, change Board_PIN_BUTTON1 to use PIN_IRQ_BOTHEDGES

static PIN_Config keyPinTable[] = {
      Board_PIN_BUTTON0 | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_NEGEDGE,
      Board_PIN_BUTTON1 | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_BOTHEDGES,
      PIN_TERMINATE /* Terminate list */
    };


2. Add the following red codes in board_key.c

#include <ti/sysbios/knl/Clock.h>
...
UInt32 button_pressed_time=0;
UInt32 button_released_time=0;static void board_key_keyFxn(PIN_Handle keyPinHandle, PIN_Id keyPinId)
{
    (void)keyPinHandle;

    if(keyPinId == keyButton0)
    {
        keysPressed |= KEY_LEFT;
    }
    else if(keyPinId == keyButton1)
    {
        if(PIN_getInputValue(keyButton1) == false){
            button_pressed_time=Clock_getTicks(); //Clock_getTicks will return counts in 10us.
            return;
         } else {
            if (PIN_getInputValue(keyButton1) == true){
                button_released_time=Clock_getTicks(); //Clock_getTicks will return counts in 10us.
            }
        }
        if ( (button_released_time-button_pressed_time)>300000 )
            keysPressed |= KEY_RIGHT_HOLD_3SEC;
        else if ( (button_released_time-button_pressed_time)>0 )
            keysPressed |= KEY_RIGHT;
    }

    if(Timer_isActive(&keyChangeClock) != true)
    {
        Timer_start(&keyChangeClock);
    }
}

3. Define KEY_RIGHT_HOLD_3SEC in board_key.h

/*! Select Key ID */
#define KEY_SELECT            0x01
/*! Up Key ID */
#define KEY_UP                0x02
/*! Down Key ID */
#define KEY_DOWN              0x04
/*! Left Key ID */
#define KEY_LEFT              0x08
/*! Right Key ID */
#define KEY_RIGHT             0x10
/*! Hold 3 seconds Right Key ID */
#define KEY_RIGHT_HOLD_3SEC   0x20

4. Add "if(keysPressed == KEY_RIGHT_HOLD_3SEC){...}" in zclSampleSw_processKey of zcl_samplesw.c to process event for right button pressing and holding for 3 seconds.

static void zclSampleSw_processKey(uint8 keysPressed)
{
    //Button 1
    if(keysPressed == KEY_LEFT)
    {
        zstack_bdbStartCommissioningReq_t zstack_bdbStartCommissioningReq;

        if(ZG_BUILD_COORDINATOR_TYPE && ZG_DEVICE_COORDINATOR_TYPE)
        {
            zstack_bdbStartCommissioningReq.commissioning_mode = BDB_COMMISSIONING_MODE_NWK_FORMATION | BDB_COMMISSIONING_MODE_NWK_STEERING | BDB_COMMISSIONING_MODE_FINDING_BINDING;
            Zstackapi_bdbStartCommissioningReq(zclSampleSw_Entity,&zstack_bdbStartCommissioningReq);
        }
        else if (ZG_BUILD_JOINING_TYPE && ZG_DEVICE_JOINING_TYPE)
        {
            zstack_bdbStartCommissioningReq.commissioning_mode = BDB_COMMISSIONING_MODE_NWK_STEERING | BDB_COMMISSIONING_MODE_FINDING_BINDING;
            Zstackapi_bdbStartCommissioningReq(zclSampleSw_Entity,&zstack_bdbStartCommissioningReq);
        }
    }
    //Button 2
    if(keysPressed == KEY_RIGHT)
    {
        zstack_bdbGetZCLFrameCounterRsp_t Rsp;

        Zstackapi_bdbGetZCLFrameCounterReq(zclSampleSw_Entity, &Rsp);
        zclGeneral_SendOnOff_CmdToggle( SAMPLESW_ENDPOINT, &zclSampleSw_DstAddr, FALSE, Rsp.zclFrameCounter );
    }
    if(keysPressed == KEY_RIGHT_HOLD_3SEC)
    {
        //Event for right button pressing and holding for 3 seconds.
    }

}