STM32定时器输出带有死区时间的PWM波形 STM32F4

要求得到下列波形，死区时间为1us，CH1，CH2，CH3之间的相位差为3us，频率为50KHz

main.c

/********************************************* 标题：定时器输出带有死区时间的PWM波形软件平台：MDK-ARM Standard Version4.70 硬件平台：stm32f4-discovery 主频：168M Periph_Driver_version: V1.0.0描述：用一个定时器(TIM1)，输出带有死区时间的PWM波形，要求：死区时间为1us，CH1，CH2，CH3之间的相位差为3us，频率为50KHz 代码参考自STM32F4-Discovery_FW_V1.1.0\Project\Peripheral_Examples\TIM_ComplementarySignalsauthor：大舟 data：2013-04-15 **********************************************/#include "stm32f4_discovery.h"TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure; TIM_OCInitTypeDefTIM_OCInitStructure; TIM_BDTRInitTypeDef TIM_BDTRInitStructure; uint16_t TimerPeriod = 0; uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0; /* Private function prototypes */ void TIM_Config(void); int main(void) { /*!< At this stage the microcontroller clock setting is already configured, this is done through SystemInit() function which is called from startup file (startup_stm32f4xx.s) before to branch to application main. To reconfigure the default setting of SystemInit() function, refer to system_stm32f4xx.c file */ /* TIM1 Configuration */ TIM_Config(); /* ----------------------------------------------------------------------- 1/ Generate 3 complementary PWM signals with 3 different duty cycles: In this example TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2), since APB2 prescaler is different from 1 (APB2 Prescaler = 2, see system_stm32f4xx.c file). TIM1CLK = 2 * PCLK2 PCLK2 = HCLK / 2 => TIM1CLK = 2*(HCLK / 2) = HCLK = SystemCoreClock To get TIM1 counter clock at 168 MHz, the prescaler is computed as follows: Prescaler = (TIM1CLK / TIM1 counter clock) - 1 Prescaler = (SystemCoreClock / 168 MHz) - 1 = 0 The objective is to generate PWM signal at 17.57 KHz: - TIM1_Period = (SystemCoreClock / 17570) - 1 To get TIM1 output clock at 17.57 KHz, the period (ARR) is computed as follows: ARR = (TIM1 counter clock / TIM1 output clock) - 1 = 9561 The Three Duty cycles are computed as the following description: TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 50% TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR)* 100 = 25% TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR)* 100 = 12.5% The Timer pulse is calculated as follows: - TIM1_CCRx = (DutyCycle * TIM1_ARR)/ 100 2/ Insert a dead time equal to (11/SystemCoreClock) ns //这句不对，示波器里观测也不对，不是这样算的。正确的deadtime的计算方法（经理论与示波器测试成功） TIM_BDTRInitStructure.TIM_DeadTime=255 //这句设定的就是寄存器TIMx_BDTR的后8位，即DTG[7:0],所以最大值为255 从下面的代码中的“第五步”中，实际上就相当于TIM1->BDTR=0x71FF; 查看"STM32中文参考手册2009.pdf"的TIMx_BDTR(第248页)，列寄存器TIMx_BDTR的后8位如下：位7:0 UTG[7:0]: 死区发生器设置 (Dead-time generator setup) 这些位定义了插入互补输出之间的死区持续时间。假设DT表示其持续时间： DTG[7:5]=0xx => DT=DTG[7:0] × Tdtg，Tdtg = Tdts； DTG[7:5]=10x => DT=(64+DTG[5:0]) × Tdtg， Tdtg = 2 × Tdts； DTG[7:5]=110 => DT=(32+DTG[4:0]) × Tdtg， Tdtg = 8 × Tdts； DTG[7:5]=111 => DT=(32+DTG[4:0]) × Tdtg， Tdtg = 16× Tdts；例：若Tdts = 1/168us(频率为168M)，可能的死区时间DT为： 0到756ns，若步长时间Tdtg为1/168us； 762ns到1512ns，若步长时间Tdtg为2/168us； 1524ns到3us，若步长时间Tdtg为8/168us； 3048ns到6us，若步长时间Tdtg为16/168us；计算这里要求设置deadtime为1us，落在区间"762ns到1512ns"，所以选择公式“DTG[7:5]=10x => DT=(64+DTG[5:0])×Tdtg，Tdtg=2×Tdts；” 列方程：(64+x)×2/168us = 1us；得x=20。所以DTG[5:0]=010100；推出DTG[7:0]=10010100=0x94。所以TIM_DeadTime=0x94。 3/ Configure the break feature, active at High level, and using the automatic output enable feature 4/ Use the Locking parameters level1. 5/这里要求3个通道的波形不是对齐的，所以必须设定为TIM_OCMode_Toggle模式，这样，ARR得走两趟才是一个周期， CCR1(TIM_Pulse)、CCR2、CCR3不同，则触发的点也不同，即错开了相位。注意，不管TIM_Pulse为什么值，占空比都是50%。因为ARR走一趟才取反一次。 6/ 要求pwm输出频率为50KHz。所以ARR=(SystemCoreClock/100000)-1 = 1679。即对时钟进行1680分频。 7/ PWM1和PWM2的相位差为3us。计算如下因为ARR自加1的时间为(1/168M)s，即可列方程：(1/168M)x=3us，得x=504。即，CCR1、CCR2、CCR3之间相隔504时，PWM的相位差就为3us Note: SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file. Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate() function to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect. ----------------------------------------------------------------------- */ /* Compute the value to be set in ARR register to generate signal frequency at 17.57 Khz */ TimerPeriod = (SystemCoreClock / 100000) - 1; //1679; 17570 ARR=9561 /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */ Channel1Pulse = 100; //= (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10); //CCR1_Val=4780，比较值 /* Compute CCR2 value to generate a duty cycle at 25%for channel 2 */ Channel2Pulse = 604; // = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100); //CCR2_Val=2390，比较值 /* Compute CCR3 value to generate a duty cycle at 12.5%for channel 3 */ Channel3Pulse = 1108; // = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000); //CCR3_Val=1195，比较值 /**@step第一步配置时钟*/ /**@step第二步配置goio口*/ /**@step第三步定时器基本配置*/ /* Time Base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; //时钟预分频数，对168M进行1(0+1)分频 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数 TIM_TimeBaseStructure.TIM_Period = TimerPeriod; //自动重装载寄存器的值，ARR=9561 TIM_TimeBaseStructure.TIM_ClockDivision = 0; //采样分频 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复寄存器，用于自动更新pwm占空比 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); /**@step第四步 PWM输出配置*/ /* Channel 1, 2 and 3 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //PWM1为正常占空比模式，PWM2为反极性模式 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //High为占空比高极性，此时占空比为20%；Low则为反极性，占空比为80% TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //使能该通道输出 TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; //设置占空比时间，CCR1_Val=4780，占空比为4780/(9561+1)=0.5 //-------下面几个参数是高级定时器才会用到通用定时器不用配置 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //使能互补端输出 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //设置互补端输出极性 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //刹车之后输出状态Specifies the TIM Output Compare pin state during Idle state TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; //刹车之后互补端输出状态 //------- TIM_OC1Init(TIM1, &TIM_OCInitStructure); //对channel1进行配置 TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; //CCR2_Val=2390，比较值 TIM_OC2Init(TIM1, &TIM_OCInitStructure); //对channel2进行配置 TIM_OCInitStructure.TIM_Pulse = Channel3Pulse; //CCR3_Val=1195，比较值 TIM_OC3Init(TIM1, &TIM_OCInitStructure); //对channel3进行配置 /**@step第五步死区和刹车功能配置,高级定时器才有的,通用定时器不用配置*/ /* Automatic Output enable, Break, dead time and lock configuration*/ TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; //运行模式下输出 TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; //空闲模式下输出选择 TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; //锁定设置，锁定级别1 TIM_BDTRInitStructure.TIM_DeadTime = 0x94; //死区时间1us TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车功能使能 TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low; //刹车输入极性，即刹车控制引脚接GND时，PWM停止 TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; //自动输出使能 TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); /* 刹车控制引脚为TIM1_BKIN pin(PB.12)，将PB12接GND，channel和其互补通道，都变为刹车后的电平，具体为0还是1，要看如下两个设置： .TIM_OCIdleState = TIM_OCIdleState_Reset; //刹车之后，PWM通道变为0 .TIM_OCNIdleState = TIM_OCNIdleState_Reset; //刹车之后，PWM互补通道变为0注意：如果没必要，还是不要开启刹车功能，因为会对PWM产生影响，特别是当PB12悬空时，波形将会有很大的波动。这里不打开刹车功能，即.TIM_Break = TIM_Break_Disable; */ /**@step第六步使能端的打开*/ /* TIM1 counter enable */ TIM_Cmd(TIM1, ENABLE); //打开TIM1 /* Main Output Enable */ TIM_CtrlPWMOutputs(TIM1, ENABLE); //PWM输出使能,一定要记得打 while (1); }/** * @briefConfigure the TIM1 Pins. * @paramNone * @retval None */ void TIM_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; /* GPIOA and GPIOB clocks enable */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOE, ENABLE); /* TIM1 clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); /* GPIOA Configuration: Channel 1 and 3 as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); /* GPIOA Configuration: Channel 2 as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOE, &GPIO_InitStructure); /* GPIOB Configuration: BKIN, Channel 1N, 2N and 3N as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_Init(GPIOB, &GPIO_InitStructure); /* Connect TIM pins to AF1 */ GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1); //引脚功能，查看readme.txt GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_TIM1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_TIM1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_TIM1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_TIM1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_TIM1); GPIO_PinAFConfig(GPIOE, GPIO_PinSource11, GPIO_AF_TIM1); } /**@end*/#ifdefUSE_FULL_ASSERT /** * @briefReports the name of the source file and the source line number *where the assert_param error has occurred. * @paramfile: pointer to the source file name * @paramline: 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) */ while (1) {} } #endif /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

readme.txt

/** @page TIM_ComplementarySignals TIM Complementary Signals example@verbatim ******************** (C) COPYRIGHT 2011 STMicroelectronics ******************* * @fileTIM_ComplementarySignals/readme.txt * @authorMCD Application Team * @version V1.0.0 * @date19-September-2011 * @briefDescription of the TIM Complementary Signals example. ****************************************************************************** * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. ****************************************************************************** @endverbatim@par Example Description This example shows how to configure the TIM1 peripheral to generate three complementary TIM1 signals, to insert a defined dead time value, to use the break feature and to lock the desired parameters.TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is equal to 0 so the TIM1 counter clock used is SystemCoreClock (168 MHz).The objective is to generate PWM signal at 17.57 KHz: - TIM1_Period = (SystemCoreClock / 17570) - 1The Three Duty cycles are computed as the following description: The channel 1 duty cycle is set to 50% so channel 1N is set to 50%. The channel 2 duty cycle is set to 25% so channel 2N is set to 75%. The channel 3 duty cycle is set to 12.5% so channel 3N is set to 87.5%. The Timer pulse is calculated as follows: - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100A dead time equal to 11/SystemCoreClock is inserted between the different complementary signals, and the Lock level 1 is selected. The break Polarity is used at High level.The TIM1 waveform can be displayed using an oscilloscope.@par Directory contents - TIM_ComplementarySignals/stm32f4xx_conf.hLibrary Configuration file - TIM_ComplementarySignals/stm32f4xx_it.cInterrupt handlers - TIM_ComplementarySignals/stm32f4xx_it.hInterrupt handlers header file - TIM_ComplementarySignals/main.cMain program - TIM_ComplementarySignals/system_stm32f4xx.cSTM32F4xx system source file@par Hardware and Software environment - This example runs on STM32F4xx Devices Revision A.- This example has been tested with STM32F4-Discovery (MB997) RevA and can be easily tailored to any other development board.- STM32F4-Discovery - Connect the TIM1 pins to an oscilloscope to monitor the different waveforms: - TIM1_CH1pin (PA.08) - TIM1_CH1N pin (PB.13) - TIM1_CH2pin (PE.11) - TIM1_CH2N pin (PB.14) - TIM1_CH3pin (PA.10) - TIM1_CH3N pin (PB.15)- Connect the TIM1 break pin TIM1_BKIN pin (PB.12) to the GND. To generate a break event, switch this pin level from 0V to 3.3V.@par How to use it ? In order to make the program work, you must do the following : + EWARM - Open the TIM_ComplementarySignals.eww workspace - Rebuild all files: Project->Rebuild all - Load project image: Project->Debug - Run program: Debug->Go(F5) + MDK-ARM - Open the TIM_ComplementarySignals.uvproj project - Rebuild all files: Project->Rebuild all target files - Load project image: Debug->Start/Stop Debug Session - Run program: Debug->Run (F5) + TASKING - Open TASKING toolchain. - Click on File->Import, select General->'Existing Projects into Workspace' and then click "Next". - Browse toTASKING workspace directory and select the project "TIM_ComplementarySignals" - Rebuild all project files: Select the project in the "Project explorer" window then click on Project->build project menu. - Run program: Select the project in the "Project explorer" window then click Run->Debug (F11) + TrueSTUDIO - Open the TrueSTUDIO toolchain. - Click on File->Switch Workspace->Other and browse to TrueSTUDIO workspace directory. - Click on File->Import, select General->'Existing Projects into Workspace' and then click "Next". - Browse to the TrueSTUDIO workspace directory and select the project "TIM_ComplementarySignals" - Rebuild all project files: Select the project in the "Project explorer" window then click on Project->build project menu. - Run program: Select the project in the "Project explorer" window then click Run->Debug (F11) * ? COPYRIGHT 2011 STMicroelectronics */

代码下载地址：http://download.csdn.net/detail/dazhou158/5261883

【STM32定时器输出带有死区时间的PWM波形】