复用功能	没有重映射	部分重映射	完全重映射
TIM3_CH1	PA6	PB4	PC6
CH2	PA7	PB5	PC7
CH3	PB0	PB0	PC8
CH4	PB1	PB1	PC9

1. /**重映射 tim3 使得PC7 PC8输出Pwm波   
   
2.   ******************************************************************************
   
3.   * @file    Project/Template/main.c
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4.   * @author  MCD Application Team
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5.   * @version V3.0.0
   
6.   * @date    04/06/2009
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7.   * @brief   Main program body
   
8.   ******************************************************************************
   
9.   * @copy
   
10.   *
    
11.   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
    
12.   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
    
13.   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
    
14.   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
    
15.   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16.   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
    
17.   *
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18.   * <h2><center>© COPYRIGHT 2009 STMicroelectronics</center></h2>
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19.   */
    
20. /* Includes ------------------------------------------------------------------*/
    
21. #include "stm32f10x.h"
    
22. #include "stm32f10x_tim.h"
    
23. #include "misc.h"
    
24. void GPIO_AFIODeInit(void);//这个函数不能落下，否则不能成功
    
25. TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;//配置PWM需要使用的结构体声名
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26. TIM_OCInitTypeDef          TIM_OCInitStructure;
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27. u16 CCR3_Val =250;
    
28. u16 CCR4_Val =250;
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29.                
    
30. void GPIO_Config(void);
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31. void Timer_Config(void);
    
32. /**
    
33.   * @brief  Delay program.
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34.   * @param  None
    
35.   * @retval : None
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36.   */
    
37. void  Delay (u32 nCount)
    
38. {
    
39.   for(; nCount != 0; nCount--);
    
40. }
    
41. /**
    
42.   * @brief  Main program.
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43.   * @param  None
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44.   * @retval : None
    
45.   */
    
46. int main(void)
    
47. {
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48. /* Setup STM32 system (clock, PLL and Flash configuration) */
    
49. SystemInit();
    
50. GPIO_Config();
    
51. Timer_Config();
    
52. /* Infinite loop */
    
53. while (1) {
    
54.                }
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55. }
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56. /**
    
57.   * @brief  GPIO_Config program.
    
58.   * @param  None
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59.   * @retval : None
    
60.   */
    
61. void GPIO_Config(void)
    
62. {
    
63.   GPIO_InitTypeDef GPIO_InitStructure;
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64.    
    
65.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |            RCC_APB2Periph_GPIOC |RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
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66. 
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67.    GPIO_AFIODeInit();  //刚开始没有这个语句，所以一直没有重映射成功
    
68.    GPIO_PinRemapConfig(GPIO_FullRemap_TIM3 , ENABLE); //这个就是重映射功能函数
    
69. /*GPIOA Configuration: TIM3 channel 3 and 4 as alternate function push-pull */
    
70.   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0 | GPIO_Pin_1;
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71.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //这里也要注意
    
72.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
73.   GPIO_Init(GPIOB, &GPIO_InitStructure); //这四句是为了校验究竟PB0，PB1是否还有PWM输出
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74.   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9;
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75.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    
76.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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77.   GPIO_Init(GPIOC, &GPIO_InitStructure);
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78.    
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79.    
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80. }
    
81. void Timer_Config(void)
    
82. {
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83. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    
84. 
    
85.   TIM_DeInit(TIM3);
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86.   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
    
87.   TIM_TimeBaseStructure.TIM_Prescaler = 0; //  设置了用来作为 TIMx 时钟频率除数的预分频值
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88.   TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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89.   TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
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90.   /* PWM1 Mode configuration: Channel3 */
    
91.   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  //TIM_OCMode
    
92.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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93.   TIM_OCInitStructure.TIM_Pulse = CCR3_Val;      //设置了待装入捕获比较寄存器的值
    
94.   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //TIM_OCPolarity :TIM 输出比较极性高
    
95.   TIM_OC3Init(TIM3, &TIM_OCInitStructure);
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96.   TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能或者失能 TIM3 在 CCR3 上的预装载寄存器
    
97.   /* PWM1 Mode configuration: Channel4 */
    
98.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
99.   TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
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100.   TIM_OC4Init(TIM3, &TIM_OCInitStructure);
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101.   TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
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102.   /* TIM3 enable counter */
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103.   TIM_Cmd(TIM3, ENABLE);          //开启时钟，别落下
     
104. }
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105. /**
     
106.   * @brief  EXTI_Config Program.
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107.   * @param  None
     
108.   * @retval : None
     
109.   */
     
110. 
     
111. /**
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112.   * @brief  Configures the nested vectored interrupt controller.
     
113.   * @param  None
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114.   * @retval : None
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115.   */
     
116. 
     
117. #ifdef  USE_FULL_ASSERT
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118. /**
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119.   * @brief  Reports the name of the source file and the source line number
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120.   *   where the assert_param error has occurred.
     
121.   * @param file: pointer to the source file name
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122.   * @param line: assert_param error line source number
     
123.   * @retval : None
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124.   */
     
125. void assert_failed(uint8_t* file, uint32_t line)
     
126. {
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127.   /* User can add his own implementation to report the file name and line number,
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128.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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129.   /* Infinite loop */
     
130.   while (1)
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131.   {
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132.   }
     
133. }
     
134. #endif
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135. /**
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136.   * @}
     
137.   */
     
138. 
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139. /******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/

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