CC1350_LAUNCHXL_fxns.c

/*
 * Copyright (c) 2018-2019, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/*
 * ======== CC1350_LAUNCHXL_fxns.c ========
 *  This file contains the board-specific initialization functions, and
 *  RF callback function for antenna switching.
 */
 
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
 
#include <ti/devices/DeviceFamily.h>
#include DeviceFamily_constructPath(driverlib/ioc.h)
#include DeviceFamily_constructPath(driverlib/cpu.h)
 
#include <ti/drivers/rf/RF.h>
#include <ti/drivers/pin/PINCC26XX.h>
 
#include <ti/drivers/Board.h>
 
#include "Board.h"
 
 
/*
 *  ======== CC1350_LAUNCHXL_sendExtFlashByte ========
 */
void CC1350_LAUNCHXL_sendExtFlashByte(PIN_Handle pinHandle, uint8_t byte)
{
    uint8_t i;
 
    /* SPI Flash CS */
    PIN_setOutputValue(pinHandle, IOID_20, 0);
 
    for (i = 0; i < 8; i++) {
        PIN_setOutputValue(pinHandle, IOID_10, 0);  /* SPI Flash CLK */
 
        /* SPI Flash MOSI */
        PIN_setOutputValue(pinHandle, IOID_9, (byte >> (7 - i)) & 0x01);
        PIN_setOutputValue(pinHandle, IOID_10, 1);  /* SPI Flash CLK */
 
        /*
         * Waste a few cycles to keep the CLK high for at
         * least 45% of the period.
         * 3 cycles per loop: 8 loops @ 48 Mhz = 0.5 us.
         */
        CPUdelay(8);
    }
 
    PIN_setOutputValue(pinHandle, IOID_10, 0);  /* CLK */
    PIN_setOutputValue(pinHandle, IOID_20, 1);  /* CS */
 
    /*
     * Keep CS high at least 40 us
     * 3 cycles per loop: 700 loops @ 48 Mhz ~= 44 us
     */
    CPUdelay(700);
}
 
/*
 *  ======== CC1350_LAUNCHXL_wakeUpExtFlash ========
 */
void CC1350_LAUNCHXL_wakeUpExtFlash(void)
{
    PIN_Config extFlashPinTable[] = {
        /* SPI Flash CS */
        IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
                PIN_INPUT_DIS | PIN_DRVSTR_MED,
        PIN_TERMINATE
    };
    PIN_State extFlashPinState;
    PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
 
    /*
     *  To wake up we need to toggle the chip select at
     *  least 20 ns and ten wait at least 35 us.
     */
 
    /* Toggle chip select for ~20ns to wake ext. flash */
    PIN_setOutputValue(extFlashPinHandle, IOID_20, 0);
    /* 3 cycles per loop: 1 loop @ 48 Mhz ~= 62 ns */
    CPUdelay(1);
    PIN_setOutputValue(extFlashPinHandle, IOID_20, 1);
    /* 3 cycles per loop: 560 loops @ 48 Mhz ~= 35 us */
    CPUdelay(560);
 
    PIN_close(extFlashPinHandle);
}
 
/*
 *  ======== CC1350_LAUNCHXL_shutDownExtFlash ========
 */
void CC1350_LAUNCHXL_shutDownExtFlash(void)
{
    /*
     *  To be sure we are putting the flash into sleep and not waking it,
     *  we first have to make a wake up call
     */
    CC1350_LAUNCHXL_wakeUpExtFlash();
 
    PIN_Config extFlashPinTable[] = {
        /* SPI Flash CS*/
        IOID_20 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL |
                PIN_INPUT_DIS | PIN_DRVSTR_MED,
        /* SPI Flash CLK */
        IOID_10 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
                PIN_INPUT_DIS | PIN_DRVSTR_MED,
        /* SPI Flash MOSI */
        IOID_9 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL |
                PIN_INPUT_DIS | PIN_DRVSTR_MED,
        /* SPI Flash MISO */
        IOID_8 | PIN_INPUT_EN | PIN_PULLDOWN,
        PIN_TERMINATE
    };
    PIN_State extFlashPinState;
    PIN_Handle extFlashPinHandle = PIN_open(&extFlashPinState, extFlashPinTable);
 
    uint8_t extFlashShutdown = 0xB9;
 
    CC1350_LAUNCHXL_sendExtFlashByte(extFlashPinHandle, extFlashShutdown);
 
    PIN_close(extFlashPinHandle);
}
 
/*
 *  ======== Board_initHook ========
 *  Called by Board_init() to perform board-specific initialization.
 */
void Board_initHook()
{
    CC1350_LAUNCHXL_shutDownExtFlash();
}
 
/*
 *  For the SysConfig generated Board.h file, Board_RF_SUB1GHZ will not be
 *  defined unless the RF module is added to the configuration.  Therefore,
 *  we don't include this code if Board_RF_SUB1GHZ is not defined.
 */
#if defined(Board_RF_SUB1GHZ)
 
/*
 * ======== CC1350_LAUNCHXL_rfDriverCallback ========
 * This is an implementation for the CC1350 launchpad which uses a
 * single signal for antenna switching.
 */
void rfDriverCallback(RF_Handle client, RF_GlobalEvent events, void *arg)
{
    /* Decode input arguments. */
    (void)client;
    RF_RadioSetup* setupCommand = (RF_RadioSetup*)arg;
 
    /* Local variable. */
    bool    sub1GHz   = false;
    uint8_t loDivider = 0;
 
    if (events & RF_GlobalEventRadioSetup) {
        /* Power up the antenna switch */
        PINCC26XX_setOutputValue(Board_RF_POWER, 1);
 
        /* Decision about the frequency band shall be made based on the
           loDivider field. */
        switch (setupCommand->common.commandNo) {
            case (CMD_RADIO_SETUP):
            case (CMD_BLE5_RADIO_SETUP):
                    loDivider = RF_LODIVIDER_MASK & setupCommand->common.loDivider;
 
                    /* Sub-1 GHz, requires antenna switch high. */
                    if ((loDivider != 0) && (loDivider != 2)) {
                            sub1GHz = true;
                    }
                    break;
            case (CMD_PROP_RADIO_DIV_SETUP):
                    loDivider = RF_LODIVIDER_MASK & setupCommand->prop_div.loDivider;
 
                    /* Sub-1 GHz, requires antenna switch high. */
                    if ((loDivider != 0) && (loDivider != 2)) {
                            sub1GHz = true;
                    }
                    break;
            default:break;
        }
 
        /* Select the correct antenna. */
        if (sub1GHz) {
            PINCC26XX_setOutputValue(Board_RF_SUB1GHZ, 1);
        }
        else {
            PINCC26XX_setOutputValue(Board_RF_SUB1GHZ, 0);
        }
    }
    else if (events & RF_GlobalEventRadioPowerDown) {
        /* Disable antenna switch to save current */
        PINCC26XX_setOutputValue(Board_RF_POWER, 0);
        PINCC26XX_setOutputValue(Board_RF_SUB1GHZ, 0);
    }
}
#endif