01.我的开发板是学习板，很多管脚没有引出。弄到定时器产生PWM这一块，想用下管脚重映射功能，毕竟库函数没有像操作寄存器那样容易理解。所以一开始着实糊涂了一会，最后还是给调出来了。结合很多别人的例程，但是发现都不够详细，所以就共享下，如果有同样问题的同学，希望能给你帮助。下面就共享下main.c。声明：以下是本人开发板的管道对应引脚
02.
03.
04.
05.复用功能
06.没有重映射
07.部分重映射
08.完全重映射
09.
10.TIM3_CH1
11.PA6
12.PB4
13.PC6
14.
15.CH2
16.PA7
17.PB5
18.PC7
19.
20.CH3
21.PB0
22.PB0
23.PC8
24.
25.CH4
26.PB1
27.PB1
28.PC9
29./**重映射 tim3 使得PC7 PC8输出Pwm波
30. ******************************************************************************
31. * @file Project/Template/main.c
32. * @author MCD Application Team
33. * @version V3.0.0
34. * @date 04/06/2009
35. * @brief Main program body
36. ******************************************************************************
37. * @copy
38. *
39. * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
40. * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
41. * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
42. * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
43. * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
44. * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
45. *
46. * <h2><center>© COPYRIGHT 2009 STMicroelectronics</center></h2>
47. */
48./* Includes ------------------------------------------------------------------*/
49.#include "stm32f10x.h"
50.#include "stm32f10x_tim.h"
51.#include "misc.h"
52.void GPIO_AFIODeInit(void);//这个函数不能落下，否则不能成功
53.TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//配置PWM需要使用的结构体声名
54.TIM_OCInitTypeDef TIM_OCInitStructure;
55.u16 CCR3_Val =250;
56.u16 CCR4_Val =250;
57.
58.void GPIO_Config(void);
59.void Timer_Config(void);
60./**
61. * @brief Delay program.
62. * @param None
63. * @retval : None
64. */
65.void Delay (u32 nCount)
66.{
67. for(; nCount != 0; nCount--);
68.}
69./**
70. * @brief Main program.
71. * @param None
72. * @retval : None
73. */
74.int main(void)
75.{
76./* Setup STM32 system (clock, PLL and Flash configuration) */
77.SystemInit();
78.GPIO_Config();
79.Timer_Config();
80./* Infinite loop */
81.while (1) {
82. }
83.}
84./**
85. * @brief GPIO_Config program.
86. * @param None
87. * @retval : None
88. */
89.void GPIO_Config(void)
90.{
91. GPIO_InitTypeDef GPIO_InitStructure;
92.
93. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
94.
95. GPIO_AFIODeInit(); //刚开始没有这个语句，所以一直没有重映射成功
96. GPIO_PinRemapConfig(GPIO_FullRemap_TIM3 , ENABLE); //这个就是重映射功能函数
97./*GPIOA Configuration: TIM3 channel 3 and 4 as alternate function push-pull */
98. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
99. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //这里也要注意
100. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
101. GPIO_Init(GPIOB, &GPIO_InitStructure); //这四句是为了校验究竟PB0，PB1是否还有PWM输出
102. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
103. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
104. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
105. GPIO_Init(GPIOC, &GPIO_InitStructure);
106.
107.
108.}
109.void Timer_Config(void)
110.{
111.RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
112.
113. TIM_DeInit(TIM3);
114. TIM_TimeBaseStructure.TIM_Period = 999; //在下一个更新事件装入活动的自动重装载寄存器周期的值
115. TIM_TimeBaseStructure.TIM_Prescaler = 0; // 设置了用来作为 TIMx 时钟频率除数的预分频值
116. TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
117. TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
118. /* PWM1 Mode configuration: Channel3 */
119. TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //TIM_OCMode
120. TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
121. TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //设置了待装入捕获比较寄存器的值
122. TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //TIM_OCPolarity :TIM 输出比较极性高
123. TIM_OC3Init(TIM3, &TIM_OCInitStructure);
124. TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能或者失能 TIM3 在 CCR3 上的预装载寄存器
125. /* PWM1 Mode configuration: Channel4 */
126. TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
127. TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
128. TIM_OC4Init(TIM3, &TIM_OCInitStructure);
129. TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
130. /* TIM3 enable counter */
131. TIM_Cmd(TIM3, ENABLE); //开启时钟，别落下
132.}
133./**
134. * @brief EXTI_Config Program.
135. * @param None
136. * @retval : None
137. */
138.
139./**
140. * @brief Configures the nested vectored interrupt controller.
141. * @param None
142. * @retval : None
143. */
144.
145.#ifdef USE_FULL_ASSERT
146./**
147. * @brief Reports the name of the source file and the source line number
148. * where the assert_param error has occurred.
149. * @param file: pointer to the source file name
150. * @param line: assert_param error line source number
151. * @retval : None
152. */
153.void assert_failed(uint8_t* file, uint32_t line)
154.{
155. /* User can add his own implementation to report the file name and line number,
156. ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
157. /* Infinite loop */
158. while (1)
159. {
160. }
161.}
162.#endif
163./**
164. * @}
165. */
166. |
楼主
标题置顶
标题高亮
