Missing TIM4 definition??

[Tom]

Posted on April 22, 2014 at 22:05

Hello All,

I trying the following configuration of TIM4 on STM32L152

void Timer4Init(void) {


RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);


// Zero cross in - counter start CH3 PB8


GPIO_InitStructure.GPIO_Pin = ZERO_CROSS_TIM4_IN_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

GPIO_Init(ZERO_CROSS_TIM4_IN_PORT, &GPIO_InitStructure);


GPIO_PinAFConfig(ZERO_CROSS_TIM4_IN_PORT, ZERO_CROSS_TIM4_IN_PIN_SOURCE, GPIO_AF_TIM4); 



/* Time base configuration -----------------------------------------------*/

TIM_TimeBaseStructure.TIM_Period = 10;

TIM_TimeBaseStructure.TIM_Prescaler = 20;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;


TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);


/* TIM4 PWM2 Mode configuration: Channel1 -----------------------------------------------*/

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable; //no GPIO output

TIM_OCInitStructure.TIM_Pulse = 1; //short impuls

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;


TIM_OC1Init(TIM4, &TIM_OCInitStructure);


/* configuration in Input Capture Mode -----------------------------------------------*/


//falling edge on PB8 starts timer


TIM_ICStructInit(&TIM_ICInitStructure); 


TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;

TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

TIM_ICInitStructure.TIM_ICFilter = 0;

TIM_ICInit(TIM4, &TIM_ICInitStructure);


/* One Pulse Mode selection */

TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Single);


/* Input Trigger selection ----------------------------------------------- */

TIM_SelectInputTrigger(TIM4, TIM_TS_TI3FP3);


/* Slave Mode selection: Trigger Mode */

TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Trigger);



Timer4DMAInit();



}

and I'm getting errors on line:

TIM_SelectInputTrigger(TIM4, TIM_TS_TI3FP3);

TIM_TS_TI3FP3 is undefined but in datasheet RM0038 (page 341) I see it should be defined (see attached image).

What am I missing here? thanks and regards Tom #tim_ts_ti3fp3-tim4-stm32l1

[Tesla DeLorean]

Posted on April 22, 2014 at 22:18

[Tom]

Posted on April 24, 2014 at 14:35

Thanks Clive,

I don't know what the hell I was looking at 😉RegardsTom

[Tom]

Posted on April 24, 2014 at 15:05

Thanks Clive,

So, as CH1 to CH3 as XORed I can still use TI1FP1 as trigger while the input signal  is on TIMx_CH3 but I have to use input capture channel 1 ? RegardsTom