Solved
How to quit a gap between 2 synchronized PWM?
Hello everyone!
I have 2 fixed PWM of 40kHz (TIM1_CH1, TIM1_CH1N) and one modulation at 80 kHz fitted into the others, matching the steps by zero.
Instead of this, I have this signals:
There is a gap between them of 1us.
This is the timers declaration:
void TIM1_3config(void){
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// Enable the TIM1 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //menos prioritat que TIM1(PWM)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //menos prioritat que TIM1(PWM)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //menos prioritat que TIM1(PWM)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //RCC_APB1Periph_TIM2
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* Timers synchronisation in parallel mode ----------------------------
1/TIM2 is configured as Master Timer:
- PWM Mode is used
- The TIM2 Update event is used as Trigger Output
2/TIM1 and TIM3 are slaves for TIM2,
- PWM Mode is used
- The ITR1(TIM2) is used as input trigger for both slaves
- Gated mode is used, so starts and stops of slaves counters
are controlled by the Master trigger output signal(update event).
TIM3//base de temps
PB0 PWM out P.P. 80kHz TIM3_CH3
PA8 40KD out P.P. 40kHz tim1_ch1 --always on
PB13 40KI out P.P. 40kHz tim1_ch1n --always on
-------------------------------------------------------------------- */
GPIOA->CRH = (GPIOA->CRH & 0xFFFFFFF0 | 0x0000000B); //PA8 40KD
GPIOB->CRH = (GPIOB->CRH & 0xFF0FFFFF | 0x00B00000); //PB13 40KI
GPIOB->CRL = (GPIOB->CRL & 0xFFFFFFF0 | 0x0000000B); //PB0 PWM
TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 900; // master
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);// - Aquest treballa de master
TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 1; //40kHz == 80kHz/2 1800--40kHz 40KD 40KI
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 900;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //SLAVE PWM 80kHz
/* Master Configuration in PWM1 Mode */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //off direct
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //TIM1_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //off direct
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = 450; //duty cycle del PWM al 50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //TIM1_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
//TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Enable);
/* Slave Mode selection: */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Trigger);
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR1); //TIM_TS_ITR1= TIM2
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM1, TIM_TS_ITR1); //=TIM2
// TIM_SetCounter(TIM1, 0);
// TIM_SetCounter(TIM3, 1100);
// Initialize Timer 2 to 0xE7 by writing ‘0xE7’ in the timer 2 counter (TIM2_CNTL).
//TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE ); //habilitar interrupció de tim2 (33us), per limit Ipri
TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM3, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);
//TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE );
TIM_Cmd(TIM2, ENABLE);
// TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
}Any sugestion?
Thanks in advance.