3、pwm 两通道输出制作呼吸灯（提供包含各种驱动的工程）

一个包含各种驱动的工程，main函数中用驱动函数实现功能

C:\Users\LiTao\Desktop\儿童智能硬件资料\my_workspace\pwm

改造实现了PWM两路输出

 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 }

nrf_pwm_config_t pwm_config = PWM_DEFAULT_CONFIG;[M1]

[M1] PWM结构体

pwm_config.mode             = PWM_MODE_LED_255;   // 8-bit resolution, 122Hz PWM frequency, 32kHz timer [M1] frequency (prescaler 9)

[M1] 设置PWM模式

pwm_config.num_channels     = 2;

pwm_config.gpio_num[0]      = LED_0;                    //该设置为使用哪个IO口作为PWM输出

pwm_config.gpio_num[1]      = LED_1;                    //该设置为使用哪个IO口作为PWM输出[M1]

[M1] PWM两个通道

nrf_pwm_init(&pwm_config); //pwm初始化[M1]

[M1] 初始化PWM

nrf_pwm_set_value(0, t); [M1]

[M1] 设置通道0的占空比为t，满为255，见上面的mode

链接：http://pan.baidu.com/s/1i3vT7cp