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TIM1定时器产生任意频率.rar
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- /*******************************************************************************
- STM32学习日志(12)---- TIM1定时器产生任意频率
- 编译环境: EWARM V5.30
- 硬件环境: 51hei
- 作者 : szlihongtao
- 时间 : 2016-07-11
- 说明 : 1. 在相应的引脚上可以观察到输出的方波波形
- PA11: STM32F103VBT6----pin63,TIM1_CH4
- 2. 要断开 EK-STM32F的 J8 的3-4脚之间的短路环
- 3. 示波器实测通过
- *******************************************************************************/
- #include "stm32f10x.h"
- #include "stm32_m.h"
- //******************************************************************************
- #define TIM1CounterClock 72000000 // 定时器的时钟频率,单位为Hz
- #define FreqStart1 1000 // 开机输出频率,单位为Hz
- ErrorStatus HSEStartUpStatus;
- INT16U freq;
- //******************************************************************************
- // 延时50ms
- //******************************************************************************
- static void delay(void)
- {
- INT32U i;
- static INT32U jjj=5240*50;
- for (i=0; i<jjj; i++);
- }
- //******************************************************************************
- static void delayms(INT16U cnt)
- {
- INT16U i;
- while(cnt--)
- for (i=0; i<7333; i++);
- }
- //******************************************************************************
- // 时钟设置初始化
- //******************************************************************************
- static void RCC_Configuration(void)
- {
- ErrorStatus HSEStartUpStatus;
- /*
- RCC_AdjustHSICalibrationValue 调整内部高速晶振(HSI)校准值
- RCC_ITConfig 使能或者失能指定的RCC中断
- RCC_ClearFlag 清除RCC的复位标志位
- RCC_GetITStatus 检查指定的RCC中断发生与否
- RCC_ClearITPendingBit 清除RCC的中断待处理位
- */
- /* RCC system reset(for debug purpose) */
- // 时钟系统复位
- RCC_DeInit();
- // 使能外部的8M晶振
- // 设置外部高速晶振(HSE)
- /* Enable HSE */
- RCC_HSEConfig(RCC_HSE_ON);
- // 使能或者失能内部高速晶振(HSI)
- RCC_HSICmd(DISABLE);
- // 等待HSE起振
- // 该函数将等待直到HSE就绪,或者在超时的情况下退出
- /* Wait till HSE is ready */
- HSEStartUpStatus = RCC_WaitForHSEStartUp();
- if(HSEStartUpStatus == SUCCESS)
- {
- /* HCLK = SYSCLK */
- // 设置AHB时钟(HCLK)
- RCC_HCLKConfig(RCC_SYSCLK_Div1); // 72 MHz
- /* PCLK1 = HCLK/2 */
- // 设置低速AHB时钟(PCLK1)
- RCC_PCLK1Config(RCC_HCLK_Div2); // 36 MHz
- /* PCLK2 = HCLK */
- // 设置高速AHB时钟(PCLK2)
- RCC_PCLK2Config(RCC_HCLK_Div1); // 72 MHz
- /* ADCCLK = PCLK2/8 */
- // 设置ADC时钟(ADCCLK)
- RCC_ADCCLKConfig(RCC_PCLK2_Div8);
- // 设置USB时钟(USBCLK)
- // USB时钟 = PLL时钟除以1.5
- RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
- // 设置外部低速晶振(LSE)
- RCC_LSEConfig(RCC_LSE_OFF);
- // 使能或者失能内部低速晶振(LSI)
- // LSE晶振OFF
- RCC_LSICmd(DISABLE);
- // 设置RTC时钟(RTCCLK)
- // 选择HSE时钟频率除以128作为RTC时钟
- RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
- // 使能或者失能RTC时钟
- // RTC时钟的新状态
- RCC_RTCCLKCmd(DISABLE);
- /* Flash 2 wait state */
- FLASH_SetLatency(FLASH_Latency_2);
- /* Enable Prefetch Buffer */
- FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
- /* PLLCLK = 8MHz * 9 = 72 MHz */
- // 设置PLL时钟源及倍频系数
- RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
- /* Enable PLL */
- // 使能或者失能PLL
- RCC_PLLCmd(ENABLE);
- /* Wait till PLL is ready */
- // 检查指定的RCC标志位设置与否
- while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
- {
- }
- /* Select PLL as system clock source */
- // 设置系统时钟(SYSCLK)
- RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
- /* Wait till PLL is used as system clock source */
- // 返回用作系统时钟的时钟源
- while(RCC_GetSYSCLKSource() != 0x08)
- {
- }
- }
- // 使能或者失能AHB外设时钟
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1
- |RCC_AHBPeriph_DMA2
- |RCC_AHBPeriph_SRAM
- |RCC_AHBPeriph_FLITF
- |RCC_AHBPeriph_CRC
- |RCC_AHBPeriph_FSMC
- |RCC_AHBPeriph_SDIO,DISABLE);
- // 使能或者失能APB1外设时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_ALL,DISABLE);
- // 强制或者释放高速APB(APB2)外设复位
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,ENABLE);
- // 退出复位状态
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,DISABLE);
- // 强制或者释放低速APB(APB1)外设复位
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,ENABLE);
- // 退出复位状态
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,DISABLE);
- // 强制或者释放后备域复位
- RCC_BackupResetCmd(ENABLE);
- // 使能或者失能时钟安全系统
- RCC_ClockSecuritySystemCmd(DISABLE);
- }
- //******************************************************************************
- // NVIC设置
- //******************************************************************************
- static void NVIC_Configuration(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- //******************************************************************************
- // GPIO设置
- //******************************************************************************
- static void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- //------------------------------------------------------------------------------
- // PA11: (TIM1_CH4) USB-DM STM32F103RC----pin70
- // 要断开 EK-STM32F的 J8 的3-4脚之间的短路环
- //------------------------------------------------------------------------------
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_SetBits(GPIOA,GPIO_Pin_11); // 这句话没有用处,因为IO使用的是特殊功能,AF_PP
- }
- //******************************************************************************
- // 改写自FW库的stm32f10x_tim.c的TIM_TimeBaseInit的函数,去掉了最后一条语句
- //******************************************************************************
- static void myTIM_TimeBaseInit(TIM_TypeDef* TIMx, TIM_TimeBaseInitTypeDef* TIM_TimeBaseInitStruct)
- {
- #define CR1_CKD_Mask ((uint16_t)0x00FF) // 参照stm32f10x_tim.c文件的设置
- #define CR1_CounterMode_Mask ((uint16_t)0x038F)
- /* Check the parameters */
- assert_param(IS_TIM_123458_PERIPH(TIMx));
- assert_param(IS_TIM_COUNTER_MODE(TIM_TimeBaseInitStruct->TIM_CounterMode));
- assert_param(IS_TIM_CKD_DIV(TIM_TimeBaseInitStruct->TIM_ClockDivision));
- /* Select the Counter Mode and set the clock division */
- TIMx->CR1 &= CR1_CKD_Mask & CR1_CounterMode_Mask;
- TIMx->CR1 |= (uint32_t)TIM_TimeBaseInitStruct->TIM_ClockDivision |
- TIM_TimeBaseInitStruct->TIM_CounterMode;
- /* Set the Autoreload value */
- TIMx->ARR = TIM_TimeBaseInitStruct->TIM_Period ;
- /* Set the Prescaler value */
- TIMx->PSC = TIM_TimeBaseInitStruct->TIM_Prescaler;
- /* Generate an update event to reload the Prescaler value immediatly */
- //TIMx->EGR = TIM_PSCReloadMode_Immediate;
- }
- //******************************************************************************
- static void Tim1_Configuration(void)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
- /* -----------------------------------------------------------------------
- TIM1 Configuration: generate 1 PWM signals
- TIM1CLK = 72 MHz, Prescaler = 1, TIM1 counter clock = 36 MHz
- TIM1 ARR Register = 1200-1 => TIM1 Frequency = TIM1 counter clock/(ARR + 1)
- TIM1 Frequency = 1 KHz.
- TIM1 Channel4 duty cycle = 10uS
- 最小频率= 36 MHz / 65535 = 549
- ----------------------------------------------------------------------- */
- /* Time base configuration */
- // TIM1_Period设置了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。它的取值必须在0x0000和0xFFFF之间。
- TIM_TimeBaseStructure.TIM_Period = (TIM1CounterClock/(2*FreqStart1))-1;
- // TIM1_Prescaler设置了用来作为TIM1时钟频率除数的预分频值。它的取值必须在0x0000和0xFFFF之间。
- TIM_TimeBaseStructure.TIM_Prescaler = 2-1;
- // TIM1_ClockDivision设置了时钟分割。
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
- // TIM1_CounterMode选择了计数器模式
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
- /*
- TIM1_RepetitionCounter设置了周期计数器值。RCR向下计数器每次计数至0,会产生一个更新事件且计数器重新由RCR值(N)开始计数。
- 这意味着在PWM模式(N+1)对应着:
- .. 边沿对齐模式下PWM周期数
- .. 中央对齐模式下PWM半周期数
- 它的取值必须在0x00和0xFF之间。
- */
- TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
- //------------------------------------------------------------------------------
- /* PWM1 Mode configuration: Channel4 */
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // 使能输出比较状态
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable; // 失能输出比较N状态
- TIM_OCInitStructure.TIM_Pulse = 360*2; // 360----10uS 180-----5uS
- /*
- TIM1_OCPolarity输出极性---TIM_OCPolarity_High,输出比较极性高,输出的是正脉冲
- TIM1_OCPolarity输出极性---TIM_OCPolarity_Low, 输出比较极性低,输出的是负脉冲
- */
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; // 互补输出极性
- // 选择空闲状态下的非工作状态
- // 当MOE=0设置TIM1输出比较空闲状态
- // 默认输出位低电平
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
- // 选择空闲状态下的非工作状态
- // 当MOE=0重置TIM1输出比较N空闲状态
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
- TIM_OC4Init(TIM1, &TIM_OCInitStructure);
- TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
- //------------------------------------------------------------------------------
- // 设置刹车特性,死区时间,锁电平,OSSI,OSSR状态和AOE(自动输出使能
- /* Automatic Output enable, Break, dead time and lock configuration*/
- // TIM1_OSSRState设置在运行模式下非工作状态选项
- // TIM1_OSSRState_Enable,使能TIM1 OSSR状态
- // TIM1_OSSRState_Disable,失能TIM1 OSSR状态
- TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Disable;
- /*
- TIM1_OSSIState设置在运行模式下非工作状态选项。该参数取值见下表。
- TIM1_OSSIState_Enable 使能TIM1 OSSI状态
- TIM1_OSSIState_Disable 失能TIM1 OSSI状态
- */
- TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Disable;
- /*
- TIM1_LOCKLevel设置了锁电平参数。该参数取值见下表。
- TIM1_LOCKLevel_OFF 不锁任何位
- TIM1_LOCKLevel_1 使用锁电平1
- TIM1_LOCKLevel_2 使用锁电平2
- TIM1_LOCKLevel_3 使用锁电平3
- */
- TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
- // TIM1_DeadTIM1指定了输出打开和关闭状态之间的延时。
- TIM_BDTRInitStructure.TIM_DeadTime = 5;
- /*
- TIM1_Break使能或者失能TIM1刹车输入。该参数取值见下表。
- TIM1_Break_Enable 使能TIM1刹车输入
- TIM1_Break_Disable 失能TIM1刹车输入
- */
- TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
- /*
- TIM1_BreakPolarity设置TIM1刹车输入管脚极性。该参数取值见下表。
- TIM1_BreakPolarity_Low TIM1刹车输入管脚极性低
- TIM1_BreakPolarity_High TIM1刹车输入管脚极性高
- */
- TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
- /*
- TIM1_AutomaticOutput使能或者失能自动输出功能,该参数取值见下表。
- TIM1_AutomaticOutput_Enable 自动输出功能使能
- TIM1_AutomaticOutput_Disable 自动输出功能失能
- */
- TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;
- TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); // 这条语句可以不执行
- // 这条语句可以不执行
- TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update); /* Master Mode selection */
- // 这条语句可以不执行
- TIM_ARRPreloadConfig(TIM1, ENABLE); // 使能TIMx在ARR上的预装载寄存器
- TIM_ITConfig(TIM1,TIM_IT_Update, ENABLE);
- TIM_ITConfig(TIM1,TIM_IT_CC4, ENABLE);
- TIM_Cmd(TIM1, DISABLE);
- }
- //******************************************************************************
- // 输出pwm的频率设置
- // 脉冲输出的高电平时间没有调整
- // freq1=1----65535Hz
- //******************************************************************************
- void Freq_Config(INT16U freq1)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- INT16U TIM_Prescaler,TIM_Period;
- INT32U utemp;
- if (freq1==0)
- return;
- utemp=TIM1CounterClock/(INT32U)freq1;
- TIM_Prescaler=utemp/65536;
- ++TIM_Prescaler; // 注意这句话,一定要++
- utemp=TIM1CounterClock/TIM_Prescaler; // 分频后的定时器输入频率
- TIM_Period=utemp/freq1; // 周期常数
- TIM_TimeBaseStructure.TIM_Period = TIM_Period-1;
- TIM_TimeBaseStructure.TIM_Prescaler = TIM_Prescaler-1;
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
- myTIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
- TIM_Cmd(TIM1, ENABLE); // 定时器开始运行
- // 这条语句必须要有!!!
- TIM_CtrlPWMOutputs(TIM1, ENABLE); /* Main Output Enable */
- }
- //******************************************************************************
- // LED5亮
- //******************************************************************************
- void Led_RW_ON(void)
- {
- GPIO_SetBits(GPIOC,GPIO_Pin_4);
- }
- //******************************************************************************
- // LED5灭
- //******************************************************************************
- void Led_RW_OFF(void)
- {
- GPIO_ResetBits(GPIOC,GPIO_Pin_4);
- }
- //******************************************************************************
- // 主程序
- //******************************************************************************
- int main(void)
- {
- INT8U i;
- RCC_Configuration();
- GPIO_Configuration();
- Tim1_Configuration();
- NVIC_Configuration();
- delay();
- for (i=0;i<3;++i)
- {
- Led_RW_ON();
- delayms(200);
- Led_RW_OFF();
- delayms(200);
- }
- //------------------------------------------------------------------------------
- for (;;)
- {
- freq=200;
- Freq_Config(freq);
- delayms(20);
- freq=800;
- Freq_Config(freq);
- delayms(20);
- GPIOC->ODR ^= GPIO_Pin_5; // led4 toogle
- }
- }
- //******************************************************************************
- #ifdef USE_FULL_ASSERT
- /**
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval : None
- */
- void assert_failed(uint8_t* file, uint32_t line)
- {
- /* User can add his own implementation to report the file name and line number,
- ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
- /* Infinite loop */
- while (1)
- {
- }
- }
- #endif
- /**
- * @}
- */
- //******************************************************************************
- /******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
- //******************************************************************************
- /*
- LED2---------PC7
- LED3---------PC6
- LED4---------PC5
- LED5---------PC4
- KEY2---------PD3
- KEY3---------PD4
- */
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