3、pwm 两通道输出制作呼吸灯（提供包含各种驱动的工程）

 1 #include <stdbool.h>
 2 #include <stdint.h>
 3 #include "nrf_delay.h"
 4 #include "nrf_gpio.h"
 5 #include "boards.h"
 6 #include "nrf_pwm.h"
 7 
 8 /**
 9  * @brief Function for application main entry.
10  */
11 int main(void)
12 {
13     uint8_t t;
14 
15     nrf_pwm_config_t pwm_config = PWM_DEFAULT_CONFIG;//
16     
17     pwm_config.mode             = PWM_MODE_LED_255;     // 8-bit resolution, 122Hz PWM frequency, 32kHz timer frequency (prescaler 9)
18     pwm_config.num_channels     = 2;
19     pwm_config.gpio_num[0]      = LED_0;                    //该设置为使用哪个IO口作为PWM输出
20     pwm_config.gpio_num[1]      = LED_1;                    //该设置为使用哪个IO口作为PWM输出
21     
22     nrf_pwm_init(&pwm_config); //pwm初始化
23     
24     // Configure LED-pins as outputs
25     nrf_gpio_cfg_output(LED_0);
26     nrf_gpio_cfg_output(LED_1); 
27 
28 
29     
30     // LED 0 and LED 1 blink alternately.
31     t=1;
32     while(true)
33     {  
34         t=t+1;
35         nrf_pwm_set_value(0, t); 
36         nrf_delay_ms(50);
37          
38         
39         if(t>200)t=0;  
40 //        nrf_pwm_set_value(1, 200); 
41     }
42 }