Posted on November 29, 2014 at 17:24I'm generating a 50Hz complementary PWM wave in stm32f4 i'm stuck on dead-time insertion as i want to insert a dead time of 2.5ms, I don't know how to do that here is my code. This is what I thought it should be but results are not accordingly ..
/* Compute the value to be set in ARR register to generate signal frequency at 50 Hz */
TimerPeriod = (10000 / 50) - 1; // ARR = 199
/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */
Channel1Pulse = (uint16_t) (((uint32_t)50 * (TimerPeriod - 1)) / 100);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 1679; // TO set counter at 10Khz
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 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_High;
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);
/* 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 = 25; //2.5ms for the case of 10Khz counter clock 25/10000 = 0.0025 sec = 2.5ms
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);
#dead-time #stm32f4 #pwm
