Function rt_hw_timer_unit_init

bsp/efm32/drv_timer.c:229–324

/ * @brief * Initialize the specified TIMER unit * * @details * * @note * * @param[in] device * Pointer to device descriptor * * @param[in] unitNumber * Unit number * * @return * Pointer to TIMER device ******************************************************************************/

 *   Pointer to TIMER device
 ******************************************************************************/
static struct efm32_timer_device_t *rt_hw_timer_unit_init(
    rt_device_t device,
    rt_uint8_t  unitNumber,
    rt_uint8_t  mode)
{
    struct efm32_timer_device_t     *timer;
    TIMER_Init_TypeDef              init;
    efm32_irq_hook_init_t           hook;
    CMU_Clock_TypeDef               timerClock;
    IRQn_Type                       timerIrq;

    do
    {
        /* Allocate device */
        timer = rt_malloc(sizeof(struct efm32_timer_device_t));
        if (timer == RT_NULL)
        {
            timer_debug("no memory for TIMER%d driver\n", unitNumber);
            break;
        }

        /* Initialization */
        if (unitNumber >= TIMER_COUNT)
        {
            break;
        }
        switch (unitNumber)
        {
        case 0:
            timer->timer_device = TIMER0;
            timerClock          = (CMU_Clock_TypeDef)cmuClock_TIMER0;
            timerIrq            = TIMER0_IRQn;
            break;

        case 1:
            timer->timer_device = TIMER1;
            timerClock          = (CMU_Clock_TypeDef)cmuClock_TIMER1;
            timerIrq            = TIMER1_IRQn;
            break;

        case 2:
            timer->timer_device = TIMER2;
            timerClock          = (CMU_Clock_TypeDef)cmuClock_TIMER2;
            timerIrq            = TIMER2_IRQn;
            break;

        default:
            break;
        }

        /* Enable TIMER clock */
        CMU_ClockEnable(timerClock, true);

        /* Reset */
        TIMER_Reset(timer->timer_device);

        /* Init specified TIMER unit */
        init.enable         = false;