Posted on November 09, 2017 at 08:07I have a problem on negative output when use the TIM8 with 6 complementary output (same on TIM1).
the problem is the polarity setting on Negative channel not work if not enable one of the output (positive or negative).
I have set the OSSR bit for have the contro without the PWM.
The same code on STM32F103 work perfectly.
PWM outPWM1PWM1NPEM2PWM2NPWM3PWM3N
CCER
register
PWM1EPWM1PPWM1NEPWM1NPPWM2EPWM2PPWM2NEPWM2NPPWM3EPWM3PPWM3NEPWM3NP
100100010000
ExpectedPWMHLHLL
On realityPWMHLLLL
the initialization code of the timer is the seguent:
#define _TIM_HALL TIM4
#define _TIM_MTR TIM8
/* select Commutation event through TIM4 */
TIM_SelectInputTrigger(_TIM_MTR, TIM_TS_ITR2);
TIM_SelectCOM(_TIM_MTR,ENABLE);
/* Time Base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStrct);
TIM_TimeBaseStrct.TIM_Prescaler = 3;
TIM_TimeBaseStrct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStrct.TIM_Period = 1024;
TIM_TimeBaseStrct.TIM_ClockDivision = 0;
TIM_TimeBaseStrct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(_TIM_MTR, &TIM_TimeBaseStrct);
/* Channel 1, 2,3 and 4 Configuration in PWM mode */
TIM_OCStructInit(&TIM_OCInitStrct);
TIM_OCInitStrct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStrct.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStrct.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStrct.TIM_Pulse = 0;
TIM_OCInitStrct.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStrct.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStrct.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStrct.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(_TIM_MTR, &TIM_OCInitStrct);
TIM_OC2Init(_TIM_MTR, &TIM_OCInitStrct);
TIM_OC3Init(_TIM_MTR, &TIM_OCInitStrct);
/* Setting for the injected ADC synchronization */
TIM_OCStructInit(&TIM_OCInitStrct);
TIM_OCInitStrct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStrct.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStrct.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStrct.TIM_Pulse = 10;
TIM_OC4Init(_TIM_MTR, &TIM_OCInitStrct);
/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRStructInit(&TIM_BDTRInitStrct);
TIM_BDTRInitStrct.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStrct.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStrct.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStrct.TIM_DeadTime = 0;
TIM_BDTRInitStrct.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStrct.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(_TIM_MTR, &TIM_BDTRInitStrct);
TIM_CCPreloadControl(_TIM_MTR, ENABLE);
/* _TIM_MTR interrupt enable */
TIM_ITConfig(_TIM_MTR, TIM_IT_COM, ENABLE);
NVIC_InitStr.NVIC_IRQChannel = TIM8_TRG_COM_TIM14_IRQn;
NVIC_InitStr.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStr.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStr.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStr);
/* _TIM_MTR counter enable */
TIM_Cmd(_TIM_MTR, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(_TIM_MTR, ENABLE);
// HallSensor is now configured, if BLDC Timer is also configured
// after enabling timer 4
// the motor will start after next overflow of the hall timer because
// this generates the first startup motor commutation event
TIM_Cmd(_TIM_HALL, ENABLE);
on main for testing i used: _TIM_MTR->CCR1 = 300;
_TIM_MTR->CCR2 = 300;
_TIM_MTR->CCR3 = 300;
_TIM_MTR->CCER = TIM_CCER_CC1E | TIM_CCER_CC1NP | TIM_CCER_CC2NP;
TIM_GenerateEvent(_TIM_MTR,TIM_EventSource_COM);
The expected output on STM32f205 not work.
On the manual, the timer periphery look like the same of STM32F103, but on STM32F205 not work.
Any one can help me?
Thanks.
