文章标题

stm32高级定时器PWM互补输出+死区插入使用详解

意法半导体开发的stm32系列单片机功能强大，其高级定时器TIM1和TIM8功能强大，配置较繁琐，本文介绍使用标准库进行配置的过程。

标准库例程

int main(void){  /*!< At this stage the microcontroller clock setting is already configured,        this is done through SystemInit() function which is called from startup       files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.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();  /* ---------------------------------------------------------------------------  TIM1 Configuration to:  1/ Generate 3 complementary PWM signals with 3 different duty cycles:    TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2), since APB2     prescaler is different from 1.       TIM1CLK = 2 * PCLK2      PCLK2 = HCLK / 2     => TIM1CLK = 2 * (HCLK / 2) = HCLK = SystemCoreClock    TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is equal to 0 so the     TIM1 counter clock used is SystemCoreClock (168MHz).    The objective is to generate PWM signal at 17.57 KHz:    - TIM1_Period = (SystemCoreClock / 17570) - 1    The 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) / 100  2/ Insert a dead time equal to (11/SystemCoreClock) ns  3/ Configure the break feature, active at High level, and using the automatic      output enable feature  4/ Use the Locking parameters level1.   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 / 17570) - 1;  /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */  Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);  /* Compute CCR2 value to generate a duty cycle at 25%  for channel 2 */  Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);  /* Compute CCR3 value to generate a duty cycle at 12.5%  for channel 3 */  Channel3Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);  /* Time Base configuration */  TIM_TimeBaseStructure.TIM_Prescaler = 0;  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;  TIM_TimeBaseStructure.TIM_ClockDivision = 0;  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);  /* Channel 1, 2 and 3 Configuration in PWM mode */  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;  TIM_OC1Init(TIM1, &TIM_OCInitStructure);  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;  TIM_OC2Init(TIM1, &TIM_OCInitStructure);  TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;  TIM_OC3Init(TIM1, &TIM_OCInitStructure);  /* Automatic Output enable, Break, dead time and lock configuration*/  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;  TIM_BDTRInitStructure.TIM_DeadTime = 11;  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);  /* TIM1 counter enable */  TIM_Cmd(TIM1, ENABLE);  /* Main Output Enable */  TIM_CtrlPWMOutputs(TIM1, ENABLE);  while (1)  {  }}

标准库对应寄存器详解