RTOS: CC2630 PWM Sample for Zigbee

/******************************************************************************

 @file  board_buzzer.c

 @brief PWM-based buzzer interface.

 Group: WCS, BTS
 Target Device: CC2650, CC2640, CC1350

 ******************************************************************************
 
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 ******************************************************************************
 Release Name: ble_sdk_2_02_01_18
 Release Date: 2016-10-26 15:20:04

 TI CC2640R2F Sensortag using TI CC2640R2F Launchpad + Educational BoosterPack MKII

 Maker/Author - Markel T. Robregado

 Modification Details : CC2640R2F Launchpad with SensorTag and Key Fob codes
                        ported from BLE Stack 2.2.1.

 Device Setup: TI CC2640R2F Launchpad + Educational BoosterPack MKII
 *****************************************************************************/

#ifndef EXCLUDE_IO

/* -----------------------------------------------------------------------------
*  Includes
* ------------------------------------------------------------------------------
*/

// TI RTOS drivers
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/family/arm/cc26xx/Power.h>
#include <ti/sysbios/family/arm/cc26xx/PowerCC2650.h>

#include <ti/drivers/PIN/PINCC26XX.h>
#include <driverLib/timer.h>


#include "board_buzzer.h"

/* -----------------------------------------------------------------------------
*  Local variables
* ------------------------------------------------------------------------------
*/
static PIN_Handle hPin = NULL;
/* BUZZER pin state */
static PIN_State buzzerPinState;

PIN_Config buzzerPinTable[] = { Board_BUZZER | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_INPUT_DIS | PIN_DRVSTR_MIN, //PIN_INV_INOUT, 
                             PIN_TERMINATE };

/* -----------------------------------------------------------------------------
*  Public Functions
* ------------------------------------------------------------------------------
*/

/*******************************************************************************
 * @fn          SensorTagBuzzer_initialize
 *
 * @brief       Initialize the Buzzer
 *
 * @descr       Initializes pin
 *
 * @return      -
 */

void SensorTagBuzzer_initialize(void){
  //RTOS: Open and assign pins through PIN driver
  hPin = PIN_open(&buzzerPinState, buzzerPinTable);
}

/*******************************************************************************
 * @fn          SensorTagBuzzer_open
 *
 * @brief       Initialize the Buzzer
 *
 * @descr       Initializes pin and PWM
 *
 * @return      -
 */
void SensorTagBuzzer_open(void)
{
    //hPin = hGpioPin;

    // Turn on PERIPH power domain and clock for GPT0 and GPIO
    Power_setDependency(PERIPH_GPT0);
    Power_setConstraint(Power_SB_DISALLOW);

    // Assign GPT0
    TimerConfigure(GPT0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM);

    // Configure pin for PWM output
#ifdef Board_BUZZER
    PINCC26XX_setMux(hPin, Board_BUZZER, IOC_PORT_MCU_PORT_EVENT0);
#endif
}


/*******************************************************************************
 * @fn          SensorTagBuzzer_setFrequency
 *
 * @brief       Set the frequency (3Hz - 8 KHz)
 *
 * @return      return true if the frequency is within range
 */
bool SensorTagBuzzer_setFrequency(uint16_t freq)
{
    uint32_t ticks;
    uint32_t loadLow;
    uint32_t loadHigh;
    uint32_t matchLow;
    uint32_t matchHigh;

    if (hPin == NULL)
    {
        // Make sure the pin is not used when not open
        return false;
    }

    if (freq < BUZZER_FREQ_MIN && freq > BUZZER_FREQ_MAX)
    {
        return false;
    }

    // Stop timer during reconfiguration
    TimerDisable(GPT0_BASE, TIMER_A);

    // Calculate timer load and match values
    ticks = 48000000 / freq;
    loadLow = ticks & 0x0000FFFF;
    loadHigh = (ticks & 0x00FF0000) >> 16;
    matchLow = (ticks / 2) & 0x0000FFFF;
    matchHigh = ((ticks / 2) & 0x00FF0000) >> 16;

    // Set timer load
    TimerLoadSet(GPT0_BASE, TIMER_A, loadLow);
    TimerPrescaleSet(GPT0_BASE, TIMER_A, loadHigh);

    // Set timer match
    TimerMatchSet(GPT0_BASE, TIMER_BOTH, matchLow);
    TimerPrescaleMatchSet(GPT0_BASE, TIMER_A, matchHigh);

    // Start timer
    TimerEnable(GPT0_BASE, TIMER_A);

    return true;
}

/*******************************************************************************
 * @fn          SensorTagBuzzer_close
 *
 * @brief       Closes the buzzer interface
 *
 * @return      -
 */
void SensorTagBuzzer_close(void)
{
    if (hPin != NULL)
    {
        // Configure pin as GPIO
#ifdef Board_BUZZER
        PINCC26XX_setMux(hPin, Board_BUZZER, IOC_PORT_GPIO);
#endif
        // Turn off PERIPH power domain and clock for GPT0
        Power_releaseDependency(PERIPH_GPT0);
        Power_releaseConstraint(Power_SB_DISALLOW);

        hPin = NULL;
    }
}

#endif // EXCLUDE_IO