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Timer slave mode : Reset mode

Question asked by bernard.thomas on Feb 9, 2012
Latest reply on Feb 9, 2012 by bernard.thomas
Hello,
I  would like to use a timer on Reset mode, but I have some problem :
My goal is to never call the timer interrupt until the trigger input is switching. I want to enter in the timer interrupt only if nothing happend on the input during a defined time (a kind of timeout on the logical input activity).

My source code is below :
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
 GPIO_InitTypeDef GPIO_InitStructure;
 TIM_ICInitTypeDef TIM_ICInitStruct;
/* TIM3 clock enable */
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
   
 /* GPIOA clock enable */
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
   
 /* TIM3 channel 1 pin (PA.6) configuration */
 GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
 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);
 /* Connect TIM14 pins to AF */
 GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM3);
   
 /* Time base configuration */
 TIM_TimeBaseStructure.TIM_Period = 65535;
 TIM_TimeBaseStructure.TIM_Prescaler = 0;
 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
   
  /* Fill the TIM_ICInitStruct with the desired parameters */
 TIM_ICInitStruct.TIM_Channel = TIM_Channel_1;
 TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising;
 TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI;
 TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1;
 TIM_ICInitStruct.TIM_ICFilter = 0;
 TIM_ICInit(TIM3, &TIM_ICInitStruct);
   
 /* TIM1 Input trigger configuration: External Trigger connected to TI1 */
 TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
 TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
 TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
 /* TIM3 IT enable */
 TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
 /* TIM3 enable counter */
 TIM_Cmd(TIM3, ENABLE);

If anyone can help me ...

Thomas

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