CC2652P: truth table of the switch

Hi Albin,

1. Disable SysConfig (details can be found here)

2. Modify the content of the ti_drivers_config.c (this file is usually generated by SysConfig, so it is important to disable it before). All the references to CONFIG_RF_SUB1GHZ can be removed. Especially in the table BoardGpioInitTable[] and in the functions initRfFrontend() and rfDriverCallback(). You should get the following:

/*
 *  =============================== PIN ===============================
 */

#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>

const PIN_Config BoardGpioInitTable[] = {
    /* XDS110 UART, Parent Signal: CONFIG_DISPLAY_UART TX, (DIO13) */
    CONFIG_PIN_UART_TX | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL | PIN_DRVSTR_MED,
    /* XDS110 UART, Parent Signal: CONFIG_DISPLAY_UART RX, (DIO12) */
    CONFIG_PIN_UART_RX | PIN_INPUT_EN | PIN_PULLDOWN | PIN_IRQ_DIS,
    /* LaunchPad Button BTN-1 (Left), Parent Signal: CONFIG_GPIO_BTN1 GPIO Pin, (DIO15) */
    CONFIG_PIN_BTN1 | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_DIS,
    /* LaunchPad Button BTN-2 (Right), Parent Signal: CONFIG_GPIO_BTN2 GPIO Pin, (DIO14) */
    CONFIG_PIN_BTN2 | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_DIS,
    /* CONFIG_RF_24GHZ (DIO28) */
    CONFIG_RF_24GHZ | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
    /* CONFIG_RF_HIGH_PA (DIO29) */
    CONFIG_RF_HIGH_PA | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,

    PIN_TERMINATE
};

const PINCC26XX_HWAttrs PINCC26XX_hwAttrs = {
    .intPriority = (~0),
    .swiPriority = 0
};



// ....

/*
 *  =============================== RF Front-end ===============================
 */

/*
 * ======== Front-end control ========
 */
static PIN_Handle frontendPins;
static PIN_State frontendState;

void initRfFrontend(void)
{
    static bool initialized = false;

    if (!initialized) {
        PIN_Config frontendConfig[] = {
            CONFIG_RF_24GHZ | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,      /* Path disabled */
            CONFIG_RF_HIGH_PA | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,      /* Path disabled */
            PIN_TERMINATE
        };
        frontendPins = PIN_open(&frontendState, frontendConfig);
        initialized = true;
    }
}

/*
 *  =============================== RF Driver ===============================
 */

#include <ti/drivers/rf/RF.h>
/*
 *  Board-specific callback function to set the correct antenna path.
 *
 */
static void rfDriverCallback(RF_Handle client, RF_GlobalEvent event, void* arg);

const RFCC26XX_HWAttrsV2 RFCC26XX_hwAttrs = {
    .hwiPriority        = (~0),
    .swiPriority        = (uint8_t)0,
    .xoscHfAlwaysNeeded = true,
    .globalCallback     = rfDriverCallback,
    .globalEventMask    = RF_GlobalEventRadioPowerDown | RF_GlobalEventRadioSetup
};

/*
 * ======== rfDriverCallback ========
 * Sets up the antenna switch depending on the current PHY configuration.
 * Truth table:
 *
 * Path        DIO28 DIO29 DIO30
 * =========== ===== ===== =====
 * Off         0     0     0
 * Sub-1 GHz   0     0     1
 * 2.4 GHz     1     0     0
 * 20 dBm TX   0     1     0
 */
static void rfDriverCallback(RF_Handle client, RF_GlobalEvent events, void *arg)
{
    /* Local variable. */
    bool    sub1GHz   = false;
    uint8_t loDivider = 0;

    /* Initialize front-end (will only be done once) */
    initRfFrontend();

    /* Switch off all paths first. Needs to be done anyway in every sub-case below. */
    PINCC26XX_setOutputValue(CONFIG_RF_24GHZ, 0);
    PINCC26XX_setOutputValue(CONFIG_RF_HIGH_PA, 0);

    if (events & RF_GlobalEventRadioSetup) {
        /* Decode the current PA configuration. */
        RF_TxPowerTable_PAType paType = (RF_TxPowerTable_PAType)RF_getTxPower(client).paType;

        /* Decode the generic argument as a setup command. */
        RF_RadioSetup* setupCommand = (RF_RadioSetup*)arg;

        switch (setupCommand->common.commandNo) {
            case (CMD_RADIO_SETUP):
            case (CMD_BLE5_RADIO_SETUP):
                    loDivider = RF_LODIVIDER_MASK & setupCommand->common.loDivider;

                    /* Sub-1GHz front-end. */
                    if (loDivider != 0) {
                        sub1GHz = true;
                    }
                    break;
            case (CMD_PROP_RADIO_DIV_SETUP):
                    loDivider = RF_LODIVIDER_MASK & setupCommand->prop_div.loDivider;

                    /* Sub-1GHz front-end. */
                    if (loDivider != 0) {
                        sub1GHz = true;
                    }
                    break;
            default:break;
        }

        if (sub1GHz) {
            /* Sub-1 GHz */
            if (paType == RF_TxPowerTable_HighPA) {
                /* PA enable --> HIGH PA
                 * LNA enable --> Sub-1 GHz
                 */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_24GHZ, PINCC26XX_MUX_GPIO);
                /* Note: RFC_GPO3 is a work-around because the RFC_GPO1 (PA enable signal) is sometimes not
                         de-asserted on CC1352 Rev A. */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_HIGH_PA, PINCC26XX_MUX_RFC_GPO3);
            } else {
                /* RF core active --> Sub-1 GHz */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_24GHZ, PINCC26XX_MUX_GPIO);
                PINCC26XX_setMux(frontendPins, CONFIG_RF_HIGH_PA, PINCC26XX_MUX_GPIO);
            }
        } else {
            /* 2.4 GHz */
            if (paType == RF_TxPowerTable_HighPA)
            {
                /* PA enable --> HIGH PA
                 * LNA enable --> 2.4 GHz
                 */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_24GHZ, PINCC26XX_MUX_RFC_GPO0);
                /* Note: RFC_GPO3 is a work-around because the RFC_GPO1 (PA enable signal) is sometimes not
                         de-asserted on CC1352 Rev A. */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_HIGH_PA, PINCC26XX_MUX_RFC_GPO3);
            } else {
                /* RF core active --> 2.4 GHz */
                PINCC26XX_setMux(frontendPins, CONFIG_RF_24GHZ, PINCC26XX_MUX_GPIO);
                PINCC26XX_setMux(frontendPins, CONFIG_RF_HIGH_PA, PINCC26XX_MUX_GPIO);
                PINCC26XX_setOutputValue(CONFIG_RF_24GHZ, 1);
            }
        }
    } else {
        /* Reset the IO multiplexer to GPIO functionality */
        PINCC26XX_setMux(frontendPins, CONFIG_RF_24GHZ, PINCC26XX_MUX_GPIO);
        PINCC26XX_setMux(frontendPins, CONFIG_RF_HIGH_PA, PINCC26XX_MUX_GPIO);
    }
}

Unfortunately I could not test my code (I do not have the appropriate HW). So please let me know if something is not completely correct.

Thanks,