1 | #include <stm32f4xx_gpio.h>
|
2 | #include <stm32f4xx_rcc.h>
|
3 | #include <stm32f4xx_tim.h>
|
4 |
|
5 | int pwm = 83.99;
|
6 |
|
7 | void init_pwm_gpi()
|
8 | {
|
9 | GPIO_InitTypeDef GPIO_InitStructure;
|
10 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
|
11 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
|
12 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; /* Use the alternative pin functions */
|
13 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /* GPIO speed - has nothing to do with the timer timing */
|
14 | GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; /* Push-pull */
|
15 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; /* Setup pull-down resistors */
|
16 | GPIO_Init(GPIOA, &GPIO_InitStructure);
|
17 | }
|
18 |
|
19 | void init_pwm_gpo()
|
20 | {
|
21 | GPIO_InitTypeDef GPIO_InitStructure;
|
22 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
|
23 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
|
24 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; /* Use the alternative pin functions */
|
25 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /* GPIO speed - has nothing to do with the timer timing */
|
26 | GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; /* Push-pull */
|
27 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; /* Setup pull-down resistors */
|
28 | GPIO_Init(GPIOD, &GPIO_InitStructure);
|
29 | GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
|
30 | }
|
31 |
|
32 | int my_init_pwm(int pwm_freq)
|
33 | {
|
34 |
|
35 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 , ENABLE );
|
36 |
|
37 | TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
|
38 | TIM_TimeBaseStructInit(& TIM_TimeBaseStructure);
|
39 | TIM_TimeBaseStructure.TIM_Prescaler = 0;
|
40 | TIM_TimeBaseStructure.TIM_Period = 8399;
|
41 | TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
|
42 | TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up ;
|
43 | TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
|
44 |
|
45 | TIM_OCInitTypeDef TIM_OCInitStructure;
|
46 |
|
47 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
|
48 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
|
49 | TIM_OCInitStructure.TIM_Pulse = pwm_freq;
|
50 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
|
51 |
|
52 | TIM_OC1Init(TIM4, &TIM_OCInitStructure);
|
53 | TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
|
54 |
|
55 | TIM_Cmd(TIM4 , ENABLE);
|
56 |
|
57 | }
|
58 |
|
59 | int main(void)
|
60 | {
|
61 | SystemInit();
|
62 | init_pwm_gpi();
|
63 | init_pwm_gpo();
|
64 |
|
65 | while(1)
|
66 | {
|
67 | static int i = 0;
|
68 | int pressedlvl = 0;
|
69 | int releasedlvl = 0;
|
70 | int pressed = 0;
|
71 |
|
72 | while (1) {
|
73 | if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)){
|
74 | pressedlvl++;
|
75 | if(pressedlvl>8000){
|
76 | if(pressed==0){
|
77 | switch(i){
|
78 | case 0: my_init_pwm(pwm*0);
|
79 | i = i + 1;
|
80 | break;
|
81 | case 1: my_init_pwm(pwm*25);
|
82 | i = i + 1;
|
83 | break;
|
84 | case 2: my_init_pwm(pwm*50);
|
85 | i = i + 1;
|
86 | break;
|
87 | case 3: my_init_pwm(pwm*75);
|
88 | i = i + 1;
|
89 | break;
|
90 | case 4: my_init_pwm(pwm*100);
|
91 | i = 0;
|
92 | break;
|
93 | }
|
94 | pressed = 1;
|
95 | }
|
96 | pressedlvl = 0;
|
97 | }
|
98 | } else {
|
99 | releasedlvl++;
|
100 | if(releasedlvl>8000){
|
101 | pressed = 0;
|
102 | releasedlvl = 0;
|
103 | }
|
104 | }
|
105 | }
|
106 | }
|
107 | }
|
