[nRF51822] 7、基础实验代码解析大全（前十）

 1 int main(void)
 2 {
 3     nrf_gpio_cfg_output(LED_1);//配置P0.21为输出
 4     nrf_gpio_pin_set(LED_1);   //指示灯D1初始状态为熄灭
 5 
 6     while (true)
 7     {
 8         //指示灯D1以200ms的间隔闪烁
 9         nrf_gpio_pin_toggle(LED_1);
10         nrf_delay_ms(100);
11     }
12 }

 1 int main(void)
 2 {
 3     nrf_gpio_range_cfg_output(LED_START, LED_STOP);//配置P0.21~P0.24为输出
 4     nrf_gpio_pin_set(LED_1);  //LED初始状态为熄灭
 5     nrf_gpio_range_cfg_input(BUTTON_START,BUTTON_STOP,NRF_GPIO_PIN_PULLUP);//配置P0.17~P0.20为输入
 6 
 7 
 8     while (true)
 9     {
10         //检测按键S1是否按下
11         if(nrf_gpio_pin_read(BUTTON_1) == 0)
12         {
13             nrf_gpio_pin_clear(LED_1);
14             while(nrf_gpio_pin_read(BUTTON_1) == 0);//等待按键释放
15             nrf_gpio_pin_set(LED_1);
16         }
17     }
18 }

 1 int main(void)
 2 {
 3     LEDS_CONFIGURE(LEDS_MASK);
 4     LEDS_OFF(LEDS_MASK);
 5     uint32_t err_code;
 6     const app_uart_comm_params_t comm_params =
 7     {
 8           RX_PIN_NUMBER,
 9           TX_PIN_NUMBER,
10           RTS_PIN_NUMBER,
11           CTS_PIN_NUMBER,
12           APP_UART_FLOW_CONTROL_DISABLED,
13           false,
14           UART_BAUDRATE_BAUDRATE_Baud38400
15     };
16 
17     APP_UART_FIFO_INIT(&comm_params,
18                          UART_RX_BUF_SIZE,
19                          UART_TX_BUF_SIZE,
20                          uart_error_handle,
21                          APP_IRQ_PRIORITY_LOW,
22                          err_code);
23 
24     APP_ERROR_CHECK(err_code);
25 
26     while (true)
27     {
28         uint8_t cr;
29         while(app_uart_get(&cr) != NRF_SUCCESS);  //等待接收串口数据
30         while(app_uart_put(cr) != NRF_SUCCESS);   //返回接收到的串口数据
31 
32         if (cr == ‘q‘ || cr == ‘Q‘)
33         {
34             printf(" \n\rExit!\n\r");
35 
36             while (true)
37             {
38                 // Do nothing.
39             }
40         }
41     }
42 }

 1 int main(void)
 2 {
       ......
 3     while (true)
 4     {
 5         uint8_t p_buff[RANDOM_BUFF_SIZE];
 6         uint8_t length = random_vector_generate(p_buff,RANDOM_BUFF_SIZE);
 7         printf("Random Vector:");
 8         for(uint8_t i = 0; i < length; i++)  //串口输出RNG
 9         {
10             printf(" %3d",(int)p_buff[i]);
11         }
12         printf("\r\n");
13         nrf_delay_ms(500);  //延时，方便观察数据
14                 nrf_gpio_pin_toggle(LED_1);  //指示灯D1指示程序运行
15     }
16 }

 1 int main(void)
 2 {
 3     uint32_t err_code = NRF_SUCCESS;
 4     
 5     //配置开发板上的4个用户LED指示灯
 6     LEDS_CONFIGURE(LEDS_MASK);
 7     LEDS_OFF(LEDS_MASK);
 8     
 9     //4个指示灯轮流闪烁一次，指示系统启动
10     for(uint32_t i = 0; i < LEDS_NUMBER; i++)
11     {   nrf_delay_ms(200);
12         LEDS_ON(BSP_LED_0_MASK << i);
13     }
14     
15     //BSP configuration for button support: button pushing will feed the dog.
16     err_code = nrf_drv_clock_init(NULL);
17     APP_ERROR_CHECK(err_code);//检查返回值
18     nrf_drv_clock_lfclk_request();
19 
20     APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, false);//定时器设置
21     err_code = bsp_init(BSP_INIT_BUTTONS, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), bsp_event_callback);//按键中断配置
22     APP_ERROR_CHECK(err_code);
23 
24     
25     //配置WDT.
26     nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;//采用默认设置
27     err_code = nrf_drv_wdt_init(&config, wdt_event_handler);//使用默认参数配置看门狗。即CPU睡眠时，看门狗保持运行；看门狗超时周期2秒
28     APP_ERROR_CHECK(err_code);
29     err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);//分配一个通道id
30     APP_ERROR_CHECK(err_code);
31     nrf_drv_wdt_enable();//使能看门狗
32 
33     while(1)
34     {
35         __SEV();  //设置事件
36         __WFE();  //进入睡眠，等待事件唤醒
37         __WFE();
38     }
39 }

 1 int main(void)
 2 {
 3     uint32_t time_ms = 500; //Time(in miliseconds) between consecutive compare events.
 4     uint32_t time_ticks;
 5     uint32_t err_code = NRF_SUCCESS;
 6     
 7     
 8     LEDS_CONFIGURE(LEDS_MASK);//配置开发板上驱赌LED的管脚为输出
 9     LEDS_OFF(LEDS_MASK);      //熄灭LED D1~D4
10     
11     //Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other.
12     err_code = nrf_drv_timer_init(&TIMER_LED, NULL, timer_led_event_handler);//初始化
13     APP_ERROR_CHECK(err_code);
14     
15     time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);
16     
17     nrf_drv_timer_extended_compare(//设置比较寄存器中的值(本实验设置的值对应于500ms)。计数器开始计数后，当计数器里的值和比较寄存器里的值相等时，产生输出比较匹配事件，触发中断。
18          &TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
19     
20     nrf_drv_timer_enable(&TIMER_LED);//启动
21 
22     while(1)
23     {
24         __WFI(); //进入睡眠，等待中断
25     }
26 }