Nordic nRF52832 Timer程式介紹

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "nrf_drv_timer.h"
#include "bsp.h"
#include "app_error.h"

const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);

/**
 * @brief Handler for timer events.
 */
void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context)
{
    static uint32_t i;
    uint32_t led_to_invert = ((i++) % LEDS_NUMBER);

    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
            bsp_board_led_invert(led_to_invert);  
            break;

        default:
            //Do nothing.
            break;
    }
}

/**
 * @brief Function for main application entry.
 */
int main(void)
{
    uint32_t time_ms = 500; //Time(in miliseconds) between consecutive compare events.
    uint32_t time_ticks;
    uint32_t err_code = NRF_SUCCESS;

    //Configure all leds on board.
    bsp_board_leds_init();
 
    //Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other.
    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler);
    APP_ERROR_CHECK(err_code);

    time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);

    nrf_drv_timer_extended_compare(
         &TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);

    nrf_drv_timer_enable(&TIMER_LED);

    while (1)
    {
        __WFI();
    }
}

const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);設定為Timer0。

void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context);Timer中斷副程式。

nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;設定為default config。

nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler);Timer初時化設定及中斷副程式。

nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);中斷時間轉為ticks.

nrf_drv_timer_extended_compare( &TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);

nrf_drv_timer_enable(&TIMER_LED);Timer啟動

此程式每500ms產生中斷，程式會跳到void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context)去執行LED控制。

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