定时器的主从模式----参照官方库函数修改为寄存器版

科科1987

定时器的主从模式---参照官方库函数修改为寄存器版；
如果有人用到定时器器主从模式的寄存器版，在这基础上修改修改，可能会节省点时间。

官方库函数（主定时器：TIM2；从定时器：TIM3、TIM4）：

00001 /**
00002   ******************************************************************************
00003   * @file TIM/Parallel_Synchro/main.c 
00004   * @author  MCD Application Team
00005   * @version V3.1.0
00006   * @date    06/19/2009
00007   * @brief   Main program body
00008   ******************************************************************************
00009   * @copy
00010   *
00011   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
00012   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
00013   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
00014   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
00015   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
00016   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
00017   *
00018   * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
00019   */ 
00020 
00021 /* Includes ------------------------------------------------------------------*/
00022 #include "stm32f10x.h"
00023 
00024 /** @addtogroup STM32F10x_StdPeriph_Examples
00025   * @{
00026   */
00027 
00028 /** @addtogroup TIM_Parallel_Synchro
00029   * @{
00030   */ 
00031 
00032 /* Private typedef -----------------------------------------------------------*/
00033 /* Private define ------------------------------------------------------------*/
00034 /* Private macro -------------------------------------------------------------*/
00035 /* Private variables ---------------------------------------------------------*/
00036 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
00037 TIM_OCInitTypeDef  TIM_OCInitStructure;
00038 
00039 /* Private function prototypes -----------------------------------------------*/
00040 void RCC_Configuration(void);
00041 void GPIO_Configuration(void);
00042 
00043 /* Private functions ---------------------------------------------------------*/
00044 
00045 /**
00046   * @brief   Main program
00047   * @param  None
00048   * @retval None
00049   */
00050 int main(void)
00051 {
00052   /* System Clocks Configuration */
00053   RCC_Configuration();
00054 
00055   /* GPIO Configuration */
00056   GPIO_Configuration();
00057 
00058   /* Timers synchronisation in parallel mode ----------------------------
00059      1/TIM2 is configured as Master Timer:
00060      - PWM Mode is used
00061      - The TIM2 Update event is used as Trigger Output  
00062      2/TIM3 and TIM4 are slaves for TIM2,
00063      - PWM Mode is used
00064      - The ITR1(TIM2) is used as input trigger for both slaves
00065      - Gated mode is used, so starts and stops of slaves counters
00066       are controlled by the Master trigger output signal(update event).
00067     
00068      The TIMxCLK is fixed to 72 MHz, the TIM2 counter clock is 72 MHz.
00069      The Master Timer TIM2 is running at 281.250 KHz and the duty cycle
00070      is equal to 25%
00071      The TIM3 is running:
00072      - At (TIM2 frequency)/ (TIM3 period + 1) = 28.125 KHz and a duty cycle
00073      equal to TIM3_CCR1/(TIM3_ARR + 1) = 30%
00074      The TIM4 is running:
00075      - At (TIM2 frequency)/ (TIM4 period + 1) = 56.250 KHz and a duty cycle
00076      equal to TIM4_CCR1/(TIM4_ARR + 1) = 60%
00077   -------------------------------------------------------------------- */
00078 
00079   /* Time base configuration */
00080   TIM_TimeBaseStructure.TIM_Period = 255;
00081   TIM_TimeBaseStructure.TIM_Prescaler = 0;
00082   TIM_TimeBaseStructure.TIM_ClockDivision = 0;
00083   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
00084 
00085   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
00086 
00087   TIM_TimeBaseStructure.TIM_Period = 9;
00088   TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
00089 
00090   TIM_TimeBaseStructure.TIM_Period = 4;
00091   TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
00092 
00093   /* Master Configuration in PWM1 Mode */
00094   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
00095   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
00096   TIM_OCInitStructure.TIM_Pulse = 64;
00097   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
00098 
00099   TIM_OC1Init(TIM2, &TIM_OCInitStructure);
00100 
00101   /* Select the Master Slave Mode */
00102   TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
00103 
00104   /* Master Mode selection */
00105   TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
00106 
00107   /* Slaves Configuration: PWM1 Mode */
00108   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
00109   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
00110   TIM_OCInitStructure.TIM_Pulse = 3;
00111 
00112   TIM_OC1Init(TIM3, &TIM_OCInitStructure);
00113 
00114   TIM_OC1Init(TIM4, &TIM_OCInitStructure);
00115 
00116   /* Slave Mode selection: TIM3 */
00117   TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);
00118   TIM_SelectInputTrigger(TIM3, TIM_TS_ITR1);
00119 
00120   /* Slave Mode selection: TIM4 */
00121   TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
00122   TIM_SelectInputTrigger(TIM4, TIM_TS_ITR1);
00123 
00124   /* TIM enable counter */
00125   TIM_Cmd(TIM3, ENABLE);
00126   TIM_Cmd(TIM2, ENABLE);
00127   TIM_Cmd(TIM4, ENABLE);
00128 
00129   while (1)
00130   {}
00131 }
00132 
00133 /**
00134   * @brief  Configures the different system clocks.
00135   * @param  None
00136   * @retval None
00137   */
00138 void RCC_Configuration(void)
00139 {
00140   /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
00141      initialize the PLL and update the SystemFrequency variable. */
00142   SystemInit();
00143   
00144   /* TIM2, TIM3 and TIM4 clock enable */
00145   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 |
00146                          RCC_APB1Periph_TIM4, ENABLE);
00147 
00148   /* GPIOA, GPIOB, GPIOC and AFIO clocks enable */
00149   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
00150                          RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
00151 }
00152 
00153 /**
00154   * @brief  Configure the GPIOD Pins.
00155   * @param  None
00156   * @retval None
00157   */
00158 void GPIO_Configuration(void)
00159 {
00160   GPIO_InitTypeDef GPIO_InitStructure;
00161 
00162 #ifdef STM32F10X_CL
00163   /*GPIOB Configuration:  PC6(TIM3 CH1) as alternate function push-pull */
00164   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 ;
00165   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
00166   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
00167 
00168   GPIO_Init(GPIOC, &GPIO_InitStructure);
00169 
00170   GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);     
00171 
00172 #else
00173 /* GPIOA Configuration: PA6(TIM3 CH1) as alternate function push-pull */
00174   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
00175   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
00176   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
00177 
00178   GPIO_Init(GPIOA, &GPIO_InitStructure);
00179 #endif
00180   /* GPIOA Configuration: PA0(TIM2 CH1) as alternate function push-pull */
00181   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
00182   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
00183   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
00184 
00185   GPIO_Init(GPIOA, &GPIO_InitStructure);
00186 
00187   /* GPIOB Configuration: PB6(TIM4 CH1) as alternate function push-pull */
00188   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
00189 
00190   GPIO_Init(GPIOB, &GPIO_InitStructure);
00191 }
00192 
00193 #ifdef  USE_FULL_ASSERT
00194 
00195 /**
00196   * @brief  Reports the name of the source file and the source line number
00197   *   where the assert_param error has occurred.
00198   * @param  file: pointer to the source file name
00199   * @param  line: assert_param error line source number
00200   * @retval None
00201   */
00202 void assert_failed(uint8_t* file, uint32_t line)
00203 {
00204   /* User can add his own implementation to report the file name and line number,
00205      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
00206 
00207   while (1)
00208   {}
00209 }
00210 #endif
00211 
00212 /**
00213   * @}
00214   */ 
00215 
00216 /**
00217   * @}
00218   */ 
00219 
00220 /******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/


修改为寄存器版（主定时器：TIM2；从定时器：TIM3，省略了TIM4）：
/*从模式：TIM2主模式，TIM3从模式*/[/mw_shl_code]
void TIM_Parallel_Synchro(void)[/mw_shl_code]
{[/mw_shl_code]
	/* System Clocks Configuration */[/mw_shl_code]
	RCC->APB2ENR|=1<<2;    //使能PORTA时钟[/mw_shl_code]
	RCC->APB1ENR|=1<<0;    //TIM2时钟使能[/mw_shl_code]
	RCC->APB1ENR|=1<<1;    //TIM3时钟使能[/mw_shl_code]
 [/mw_shl_code]
	/* GPIO Configuration */[/mw_shl_code]
	GPIOA->CRL&=0XFFFFFFF0;//PA0输出[/mw_shl_code]
	GPIOA->CRL|=0X0000000B;//50Hz，复用功能输出 	  [/mw_shl_code]
	GPIOA->ODR|=1<<0;      //PA0上拉[/mw_shl_code]
 [/mw_shl_code]
	GPIOA->CRL&=0XF0FFFFFF;//PA6输出[/mw_shl_code]
	GPIOA->CRL|=0X0B000000;//50Hz，复用功能输出 	  [/mw_shl_code]
	GPIOA->ODR|=1<<6;      //PA6上拉	[/mw_shl_code]
	/* Time base configuration */[/mw_shl_code]
	TIM2->ARR=255;//设定计数器自动重装值 [/mw_shl_code]
	TIM2->SC=0  ;//预分频器分频[/mw_shl_code]
	TIM2->CR1 &=~(3<<8);// 选择时钟分频[/mw_shl_code]
        TIM2->CR1 &=~(3<<5);// 选择计数模式[/mw_shl_code]
 [/mw_shl_code]
	TIM3->ARR=9;        //设定计数器自动重装值 [/mw_shl_code]
	TIM3->SC=0  ;		//预分频器分频[/mw_shl_code]
	TIM3->CR1 &=~(3<<8);// 选择时钟分频[/mw_shl_code]
        TIM3->CR1 &=~(3<<5);// 选择计数模式[/mw_shl_code]
         /* Master Configuration in PWM1 Mode */[/mw_shl_code]
	TIM2->CCMR1|=6<<4;  //输出比较模式[/mw_shl_code]
	TIM2->CCER |=1<<0;   //OC1 输出使能[/mw_shl_code]
	TIM2->CCR1  =64;	 //捕获比较寄存器（占空比）[/mw_shl_code]
	TIM2->CCER &=~(1<<1);   //OC1 输出极性[/mw_shl_code]
 [/mw_shl_code]
	/* Select the Master Slave Mode */[/mw_shl_code]
	TIM2->SMCR|=1<<7;	//选择主从模式[/mw_shl_code]
 [/mw_shl_code]
	/* Master Mode selection */[/mw_shl_code]
	TIM2->CR2 |=2<<4;// 主模式选择[/mw_shl_code]
 [/mw_shl_code]
	/* Slaves Configuration: PWM1 Mode */[/mw_shl_code]
	TIM3->CCMR1|=6<<4;  //输出比较模式[/mw_shl_code]
	TIM3->CCER |=1<<0;   //OC1 输出使能[/mw_shl_code]
	TIM3->CCR1  =3;	 //捕获比较寄存器（占空比）[/mw_shl_code]
	TIM3->CCER &=~(1<<1);   //OC1 输出极性[/mw_shl_code]
 [/mw_shl_code]
	/* Slave Mode selection: TIM3 */[/mw_shl_code]
	TIM3->SMCR|=5<<0;	//从模式选择[/mw_shl_code]
	TIM3->SMCR|=1<<4;	//触发选择[/mw_shl_code]
 [/mw_shl_code]
	/* TIM enable counter */	[/mw_shl_code]
	TIM3->CR1|=0x01;    //CEN=1，使能定时器[/mw_shl_code]
	TIM2->CR1|=0x01;    //CEN=1，使能定时器[/mw_shl_code]
}
仿真结果：

但是仿真结果并不是库函数注释中描述的那样
The TIMxCLK is fixed to 72 MHz, the TIM2 counter clock is 72 MHz.
The Master Timer TIM2 is running at 281.250 KHz and the duty cycle is equal to 25%
The TIM3 is running:
  - At (TIM2 frequency)/ (TIM3 period + 1) = 28.125 KHz and a duty cycle
      equal to TIM3_CCR1/(TIM3_ARR + 1) = 30% [/mw_shl_code] 





 







如果修改：TIM3->SMCR|=5<<0;	//从模式选择

为：TIM3->SMCR|=7<<0;	//从模式选择  

仿真结果与库函数描述相同。





 











[/mw_shl_code]










 [/mw_shl_code]

正点原子

谢谢分享.

565956807@qq.co

学习

鲁少迅

请问楼主是用什么仿真的？

科科1987

回复【4楼】鲁少迅:
---------------------------------
keil自带的仿真功能

李四

谢谢共享!复制学习。

zsk

hao

liangronglin

             不错不错，正在学习定时器，很有用

烂泥桑

我先记下再说

higerd_han

谢谢楼主的分享 学习了！

逗留点点

为什么我用time3做主定时器。time2做从定时器就不行了呢？有什么需要注意的地方么？

逗留点点

回复【2楼】正点原子:
---------------------------------
原子哥，为什么只能用time2做为主定时器，我用time3做主定时器，time2做从定时器怎么不行呢！

正点原子

回复【12楼】逗留点点:
---------------------------------
这个没有研究哦

MCU赖石华

回复10楼：是不是你TIM_SelectInputTrigger(TIM2, TIM_TS_ITR1)的TIM_TS_ITR1没有改为TIM_TS_ITR2呢

498678420@qq.co

快速回复

LLmeishi

学习中

科科1987

原子哥，我的帖子怎么没有内容了

漫天WPF飞雪

学习了，谢谢大神。

刘远鹏

不错

刘远鹏

程序喃？？？？？

科科1987

刘远鹏 发表于 2016-3-2 15:18
程序喃？？？？？

帖子内容消失了@正点原子

Blueyas

学习学习，自己没调通

单模先声

。。。。

单模先声

能不能把程序再发一次？

科科1987

单模先声 发表于 2016-3-8 16:52
能不能把程序再发一次？

四年前的帖子了，我也找不着程序了，请论坛管理员看看为什么不显示帖子内容了 @正点原子

坚持创造奇迹

谢谢分享

wtyiyou

好谢谢

wangjx02

学习中

wangjx02

怎么看不到内容呢？

無痕rpes

谢谢楼主分享

潇译Vicky

正想说帖子咋没有内容了

xuguangyun123

谢谢分享！

weicon

谢谢 正在学习

huangzhihao

不错哦凑数字

ily521

学习学习

wx389390063

学习关于定时器的主从模式

wx389390063

我以为回复就可以看到内容，结果还是没有！哪位大神下载了上传一下的！

lds2131

谢谢楼主分享

lds2131

哪位大神上传一下

chwf491701687

学习，学习 。

chwf491701687

学习，学习 ！……

汪少

haohaohao

武小修

正在学习

Alvin_Liu

学习！！！！！

sanv

我来看看

仁0者

kankan

火线少爷

臣妾看不到啊！

xu_zhh

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