NRF52832 GPIOTE OUTPUT使用

1.在sdk_config.h中加入宏

 

// GPIOTE_ENABLED - nrf_drv_gpiote - GPIOTE peripheral driver
//==========================================================
#ifndef GPIOTE_ENABLED
#define GPIOTE_ENABLED 1
#endif
// GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS - Number of lower power input pins 
#ifndef GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS
#define GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 4
#endif

// GPIOTE_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef GPIOTE_CONFIG_IRQ_PRIORITY
#define GPIOTE_CONFIG_IRQ_PRIORITY 7
#endif

 

 

#ifndef PPI_ENABLED
#define PPI_ENABLED 1
#endif

// TIMER_ENABLED - nrf_drv_timer - TIMER periperal driver - legacy layer
//==========================================================
#ifndef TIMER_ENABLED
#define TIMER_ENABLED 1
#endif
// TIMER_DEFAULT_CONFIG_FREQUENCY  - Timer frequency if in Timer mode
 
// <0=> 16 MHz 
// <1=> 8 MHz 
// <2=> 4 MHz 
// <3=> 2 MHz 
// <4=> 1 MHz 
// <5=> 500 kHz 
// <6=> 250 kHz 
// <7=> 125 kHz 
// <8=> 62.5 kHz 
// <9=> 31.25 kHz 

#ifndef TIMER_DEFAULT_CONFIG_FREQUENCY
#define TIMER_DEFAULT_CONFIG_FREQUENCY 4
#endif

// TIMER_DEFAULT_CONFIG_MODE  - Timer mode or operation
 
// <0=> Timer 
// <1=> Counter 

#ifndef TIMER_DEFAULT_CONFIG_MODE
#define TIMER_DEFAULT_CONFIG_MODE 0
#endif

// TIMER_DEFAULT_CONFIG_BIT_WIDTH  - Timer counter bit width
 
// <0=> 16 bit 
// <1=> 8 bit 
// <2=> 24 bit 
// <3=> 32 bit 

#ifndef TIMER_DEFAULT_CONFIG_BIT_WIDTH
#define TIMER_DEFAULT_CONFIG_BIT_WIDTH 3
#endif

// TIMER_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef TIMER_DEFAULT_CONFIG_IRQ_PRIORITY
#define TIMER_DEFAULT_CONFIG_IRQ_PRIORITY 6
#endif

#ifndef TIMER0_ENABLED
#define TIMER0_ENABLED 1
#endif

// TIMER1_ENABLED  - Enable TIMER1 instance
 

#ifndef TIMER1_ENABLED
#define TIMER1_ENABLED 0
#endif

// TIMER2_ENABLED  - Enable TIMER2 instance
 

#ifndef TIMER2_ENABLED
#define TIMER2_ENABLED 0
#endif

// TIMER3_ENABLED  - Enable TIMER3 instance
 

#ifndef TIMER3_ENABLED
#define TIMER3_ENABLED 0
#endif

// TIMER4_ENABLED  - Enable TIMER4 instance
 

#ifndef TIMER4_ENABLED
#define TIMER4_ENABLED 0
#endif

2.导入nrfx_ppi.c,nrfx_timer.c,nrfx_gpiote.c,nrf_drv_ppi.c到工程文件中

3.加入头文件

#include "nrf_drv_gpiote.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"

4.定义定时器0实例 
static nrf_drv_timer_t timer = NRF_DRV_TIMER_INSTANCE(0);

5.定时输出引脚

#define GPIO_OUTPUT_PIN_NUMBER 16  /**< Pin number for output. */

6.定义定时器事件,如果使能中断,则会调用

void timer_dummy_handler(nrf_timer_event_t event_type, void * p_context){
    printf("timer_dummy_handler\n");
}

7.GPIOTE输出的相关初时化

static void led_blinking_setup()
{
    uint32_t compare_evt_addr;
    uint32_t gpiote_task_addr;
    nrf_ppi_channel_t ppi_channel;
    ret_code_t err_code;
    nrf_drv_gpiote_out_config_t config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false);  

    err_code = nrf_drv_gpiote_out_init(GPIO_OUTPUT_PIN_NUMBER, &config); // P0_16 GPIOTE OUTPUT 
    APP_ERROR_CHECK(err_code);

    nrf_drv_timer_extended_compare(&timer, (nrf_timer_cc_channel_t)0, 200 * 1000UL, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true); //false 不使用事件中断,true使用事件中断

    err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);  //分配PPI通道
    APP_ERROR_CHECK(err_code);

    compare_evt_addr = nrf_drv_timer_event_address_get(&timer, NRF_TIMER_EVENT_COMPARE0);  //获取定时器比较器0地址
    gpiote_task_addr = nrf_drv_gpiote_out_task_addr_get(GPIO_OUTPUT_PIN_NUMBER);    //获取GPIOTE输出任务地址

    err_code = nrf_drv_ppi_channel_assign(ppi_channel, compare_evt_addr, gpiote_task_addr); //将相关事件，任务地址与PPI通道关联上
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_ppi_channel_enable(ppi_channel);     //使能PPI通道
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_out_task_enable(GPIO_OUTPUT_PIN_NUMBER); //使能GPIOTE任务
}

8.在主函数中初时化

     uint32_t err_code;

    err_code = nrf_drv_ppi_init();   //PPI初时化
    APP_ERROR_CHECK(err_code);
    if(!nrf_drv_gpiote_is_init())
    {
        err_code = nrf_drv_gpiote_init();   //GPIOTE初时化
        APP_ERROR_CHECK(err_code);
    }
    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&timer, &timer_cfg, timer_dummy_handler); //定时器初时化
    APP_ERROR_CHECK(err_code);

    // Setup PPI channel with event from TIMER compare and task GPIOTE pin toggle.
    led_blinking_setup();   

    // Enable timer
    nrf_drv_timer_enable(&timer);  //启动定时器