2、跑马灯测试程序（设置一定范围的gpio）

 1 int main(void)
 2 {
 3   uint8_t output_state = 0;
 4 
 5   // Configure LED-pins as outputs
 6   nrf_gpio_range_cfg_output(LED_START, LED_STOP);//[1]
 7 
 8   while(true)
 9   {
10     nrf_gpio_port_write(LED_PORT, 1 << (output_state + LED_OFFSET));
11     output_state = (output_state + 1) & BLINKY_STATE_MASK;
12     nrf_delay_ms(100);
13   }
14 }