GD32方案分享⑧：PWM实验

何昌昕

因为我们需要驱动电机，所以我们需要输出PWM波，参照例程中的PWM例子进行修改

PWM频率 = （当前主频（200Mhz）/(period+1))/（prescaler+1）
通道占空比 = (duty/period)*100%

分别输出了 50% 10Khz的PWM波 90% 10Khz的PWM波

1. 
   
2. #include "PWM.h"
   
3. 
   
4. void PWM_Init(void)
   
5. {
   
6.    rcu_periph_clock_enable(RCU_GPIOB);
   
7.    
   
8.     gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_3);
   
9.     gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_3);
   
10. 
    
11.     gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_10);
    
12.     gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_10);
    
13. 
    
14.     gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_11);
    
15.     gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_11);
    
16. 
    
17.     gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_3);
    
18.     gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_10);
    
19.     gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_11);
    
20.     timer_oc_parameter_struct timer_ocintpara;
    
21.     timer_parameter_struct timer_initpara;
    
22. 
    
23.     rcu_periph_clock_enable(RCU_TIMER1);
    
24.     rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
    
25. 
    
26.     timer_deinit(TIMER1);
    
27. 
    
28.     /* TIMER1 configuration */
    
29.     timer_initpara.prescaler         = 1;
    
30.     timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    
31.     timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    
32.     timer_initpara.period            = 9999;
    
33.     timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    
34.     timer_initpara.repetitioncounter = 0;
    
35.     timer_init(TIMER1,&timer_initpara);
    
36. 
    
37.     /* CH1,CH2 and CH3 configuration in PWM mode1 */
    
38.     timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;
    
39.     timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
    
40. 
    
41.     timer_channel_output_config(TIMER1,TIMER_CH_1,&timer_ocintpara);
    
42.     timer_channel_output_config(TIMER1,TIMER_CH_2,&timer_ocintpara);
    
43.     timer_channel_output_config(TIMER1,TIMER_CH_3,&timer_ocintpara);
    
44. 
    
45.     /* CH1 configuration in PWM mode1,duty cycle 25% */
    
46.     timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_1,1999);
    
47.     timer_channel_output_mode_config(TIMER1,TIMER_CH_1,TIMER_OC_MODE_PWM0);
    
48.     timer_channel_output_shadow_config(TIMER1,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);
    
49. 
    
50.     /* CH2 configuration in PWM mode1,duty cycle 50% */
    
51.     timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_2,4999);
    
52.     timer_channel_output_mode_config(TIMER1,TIMER_CH_2,TIMER_OC_MODE_PWM0);
    
53.     timer_channel_output_shadow_config(TIMER1,TIMER_CH_2,TIMER_OC_SHADOW_DISABLE);
    
54. 
    
55.     /* CH3 configuration in PWM mode1,duty cycle 75% */
    
56.     timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_3,8999);
    
57.     timer_channel_output_mode_config(TIMER1,TIMER_CH_3,TIMER_OC_MODE_PWM0);
    
58.     timer_channel_output_shadow_config(TIMER1,TIMER_CH_3,TIMER_OC_SHADOW_DISABLE);
    
59. 
    
60.     /* auto-reload preload enable */
    
61.     timer_auto_reload_shadow_enable(TIMER1);
    
62.     /* auto-reload preload enable */
    
63.     timer_enable(TIMER1);
    
64. }
    

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明天开始搭建小车硬件 附件：

myGD32 - 副本.rar (7.42 MB, 下载次数: 16)

2017-5-27 23:47 上传

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1. #include "include.h"
   
2. 
   
3. //extern int LDC_val;
   
4. 
   
5. int main(void)
   
6. {
   
7.     systick_config();
   
8.         
   
9.           UART_Init(Debug_UART,115200);
   
10.     LED_Init();         
    
11.           //LDC1000_Init();
    
12.         
    
13.           PWM_Init();
    
14.           while(1)
    
15.          {
    
16.                           LED_Troggle();
    
17.                     delay_1ms(100);
    
18.                     //LDC_val=LDC_Read_Avr()/10;//采样滤波
    
19.                     //printf("当前通道值:%d\r\n",LDC_val);
    
20.     }
    
21. }

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