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- /*******************************************************************************
- STM32学习日志(11)---- PWM输出
- 编译环境: EWARM V5.30
- 硬件环境: 南京万利 EK-STM32F
- 作者 : szlihongtao
- 时间 : 2010-07-05
- 说明 : 1. 在相应的引脚上可以观察到PWM波形
- // PA.06: (TIM3_CH1) STM32F103VBT6----pin31
- // PA.07: (TIM3_CH2) STM32F103VBT6----pin32
- // PB.00: (TIM3_CH3) STM32F103VBT6----pin35
- // PB.01: (TIM3_CH4) STM32F103VBT6----pin36
- 2. 在运行过程中修改占空比
- 3. 4路输出波形的频率总是一样的
- *******************************************************************************/
- #include "stm32f10x.h"
- #include "stm32_m.h"
- //******************************************************************************
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- uint16_t CCR1_Val = 500;
- uint16_t CCR2_Val = 375;
- uint16_t CCR3_Val = 250;
- uint16_t CCR4_Val = 125;
- ErrorStatus HSEStartUpStatus;
- //******************************************************************************
- // 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);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); // tim3时钟使能
- // 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)
- {
- }
- //******************************************************************************
- // GPIO设置
- //******************************************************************************
- static void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- // 使能或者失能APB2外设时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
- 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_3|GPIO_Pin_4;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- // PA.06: (TIM3_CH1) STM32F103VBT6----pin31
- // PA.07: (TIM3_CH2) STM32F103VBT6----pin32
- /* GPIOA Configuration: TIM3 channel 1 and 2 as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- // PB.00: (TIM3_CH3) STM32F103VBT6----pin35
- // PB.01: (TIM3_CH4) STM32F103VBT6----pin36
- /* GPIOB Configuration: TIM3 channel 3 and 4 as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- }
- //******************************************************************************
- static void Tim3_Configuration(void)
- {
- /* TIM3 clock enable */
- //RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
- /* -----------------------------------------------------------------------
- TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
- TIM3CLK = 72 MHz, Prescaler = 0x1, TIM3 counter clock = 36 MHz
- TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
- TIM3 Frequency = 36 KHz.
- TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
- TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
- TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
- TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
- ----------------------------------------------------------------------- */
- /* Time base configuration */
- TIM_TimeBaseStructure.TIM_Period = 1000-1;
- TIM_TimeBaseStructure.TIM_Prescaler = 2-1;
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
- //------------------------------------------------------------------------------
- /* PWM1 Mode configuration: Channel1 */
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
- TIM_OC1Init(TIM3, &TIM_OCInitStructure);
- TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); // 使能TIMx在CCR1上的预装载寄存器
- //------------------------------------------------------------------------------
- /* PWM1 Mode configuration: Channel2 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
- TIM_OC2Init(TIM3, &TIM_OCInitStructure);
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
- //------------------------------------------------------------------------------
- /* PWM1 Mode configuration: Channel3 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
- TIM_OC3Init(TIM3, &TIM_OCInitStructure);
- TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
- //------------------------------------------------------------------------------
- /* PWM1 Mode configuration: Channel4 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
- TIM_OC4Init(TIM3, &TIM_OCInitStructure);
- TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);// 使能TIMx在CCR1上的预装载寄存器
- //------------------------------------------------------------------------------
- TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIMx在ARR上的预装载寄存器
- TIM_SetClockDivision(TIM3,TIM_CKD_DIV4); // 这句话好像没有什么用处
- // 设定为 TIM_CKD_DIV4,TIM_CKD_DIV1都是一样的
- TIM_Cmd(TIM3, ENABLE); // 定时器开始运行
- }
- //******************************************************************************
- // 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();
- Tim3_Configuration();
- NVIC_Configuration();
- delay();
- for (i=0;i<3;++i)
- {
- Led_RW_ON();
- delayms(200);
- Led_RW_OFF();
- delayms(200);
- }
- //------------------------------------------------------------------------------
- for (;;)
- {
- delayms(3333);
- GPIOC->ODR ^= GPIO_Pin_7; // led2 toogle
- CCR4_Val = 25; // 对应 PB01,(TIM3_CH4) STM32F103VBT6----pin36
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable ;
- TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
- TIM_OC4Init(TIM3, &TIM_OCInitStructure);
- }
- }
- //******************************************************************************
- #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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