generate one pulse

[kong0073]

Posted on July 08, 2011 at 06:18

I am trying to generate a single pulse using the TIM_SelectOnePulseMode() function in STM32f10x_tim.c source file. But I am not able to get the pulse. why?

I am using TIM4 CH2... Any advice? int main(void) {     TIM_Cmd(TIM4, DISABLE);     RCC_Configuration();     GPIO_Configuration();     PrescalerValue = (SystemCoreClock / 24000000) - 1;         TIM_TimeBaseStructure.TIM_Period = 65535     TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue     TIM_TimeBaseStructure.TIM_ClockDivision = 0;     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;     TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;     TIM_OCInitStructure.TIM_Pulse = 16383     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;     TIM_OC2Init(TIM4, &TIM_OCInitStructure);     TIM_Cmd(TIM4, ENABLE);     TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Repetitive);     return 0; } void RCC_Configuration(void) {     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);     RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM4, ENABLE); } void GPIO_Configuration(void) {   GPIO_InitTypeDef GPIO_InitStructure;   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_Init(GPIOD, &GPIO_InitStructure); } #timer-one-shot #one-pulse #stm32 #tim4

[rosarium]

Posted on July 08, 2011 at 06:32

which STM32 you are using?? the exact part no??

[kong0073]

Posted on July 08, 2011 at 07:26

i'm using STM32F100B-eval...

[rosarium]

Posted on July 08, 2011 at 09:46

for one pulse you have to do

/* One Pulse Mode selection */ TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single); but you are doing TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Repetitive); Please find here attached an example source code for generating one pulse. Hope it will help. Rgds, Rosarium ________________ Attachments : OnePulse.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I1D8&d=%2Fa%2F0X0000000bjt%2FDDx0jf4tKrrBNem0inHVER9iZcqPyjb2YZcYTDmAE5w&asPdf=false

[rosarium]

Posted on July 08, 2011 at 09:56 TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Single);

[kong0073]

Posted on July 08, 2011 at 10:13

thanks! but erm, it didn't matter if i used ''single'' or ''repetitive'', there was still no output at my TIM4. And is the input capture mode necessary? since I just need to output pulses...

[rosarium]

Posted on July 08, 2011 at 10:33

Yes input capture is also necessary.

Following is an example for TIM2 as attached last time.

int main(void)

{   /* System Clocks Configuration */   RCC_Configuration();

  /* Configure the GPIO ports */

  GPIO_Configuration();

  /* TIM2 configuration: One Pulse mode ------------------------

     The external signal is connected to TIM2_CH2 pin (PA.01),      The Rising edge is used as active edge,      The One Pulse signal is output on TIM2_CH1 pin (PA.00)      The TIM_Pulse defines the delay value      The (TIM_Period -  TIM_Pulse) defines the One Pulse value.      The TIM2CLK is fixed to 72 MHz, the Prescaler is 1, so the      TIM2 counter clock is 36 MHz.      The Autoreload value is 65535 (TIM2->ARR), so the maximum      frequency value to trigger the TIM2 input is 500 Hz.      The TIM_Pulse defines the delay value, the delay value is fixed      to 455.08 us:      delay =  CCR1/TIM2 counter clock = 455.08 us.      The (TIM_Period - TIM_Pulse) defines the One Pulse value,      the pulse value is fixed to 1.365ms:      One Pulse value = (TIM_Period - TIM_Pulse)/TIM2 counter clock = 1.365 ms.   ------------------------------------------------------------ */

  /* Time base configuration */

  TIM_TimeBaseStructure.TIM_Period = 65535;   TIM_TimeBaseStructure.TIM_Prescaler = 1;   TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* TIM2 PWM2 Mode configuration: Channel1 */

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   TIM_OCInitStructure.TIM_Pulse = 16383;   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  TIM_OC1Init(TIM2, &TIM_OCInitStructure);

  /* TIM2 configuration in Input Capture Mode */

  TIM_ICStructInit(&TIM_ICInitStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;

  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;   TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;   TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   TIM_ICInitStructure.TIM_ICFilter = 0;

  TIM_ICInit(TIM2, &TIM_ICInitStructure);

  /* One Pulse Mode selection */

  TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);

  /* Input Trigger selection */

  TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);

  /* Slave Mode selection: Trigger Mode */

  TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);

  while (1)

  {} }

[Tesla DeLorean]

Posted on July 08, 2011 at 13:54

I am trying to generate a single pulse using the TIM_SelectOnePulseMode() function in STM32f10x_tim.c source file. But I am not able to get the pulse. why?

I am using TIM4 CH2... Any advice?

Well for starters, to get TIM4_CH2 out of PD13, you are going to need to enable the AFIO peripheral and Remap the TIM4 to use those pins. If your board/part isn't using PD13, then you'll need to enable the appropriate pin (PB7 ?)

[kong0073]

Posted on July 11, 2011 at 04:22

ok, now I have changed to TIM2 CH1 (PA0)  which coincides with the wakeup.

I have enabled my AFIO and re-mapped my TIM2 CH1, but I am still not getting it. Why? here's my code. //  ******************************************************************************   #include ''stm32f10x.h'' TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure; TIM_ICInitTypeDef  TIM_ICInitStructure; TIM_OCInitTypeDef  TIM_OCInitStructure; void RCC_Configuration(void); void GPIO_Configuration(void); int main(void) {   RCC_Configuration();   GPIO_Configuration();   TIM_TimeBaseStructure.TIM_Period = 65535;   TIM_TimeBaseStructure.TIM_Prescaler = 1;   TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   TIM_OCInitStructure.TIM_Pulse = 16383;   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   TIM_OC1Init(TIM2, &TIM_OCInitStructure);   TIM_ICStructInit(&TIM_ICInitStructure);   TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;   TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;   TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;   TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   TIM_ICInitStructure.TIM_ICFilter = 0;   TIM_ICInit(TIM2, &TIM_ICInitStructure);   TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);   TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);   TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);   while (1)   {} } void RCC_Configuration(void) {   SystemInit();   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); } void GPIO_Configuration(void) {   GPIO_InitTypeDef GPIO_InitStructure;   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_Init(GPIOA, &GPIO_InitStructure);   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   GPIO_Init(GPIOA, &GPIO_InitStructure);   GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE); } #ifdef  USE_FULL_ASSERT void assert_failed(uint8_t* file, uint32_t line) {   while (1)   {} } #endif

[kong0073]

Posted on July 11, 2011 at 04:33

hi, i tried copy-and-paste your code to see if works, but i'm still not getting a pulse.

and i received another reply from another user that I should enable AFIO and remap, so please see my code below: #include ''stm32f10x.h'' TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure; TIM_ICInitTypeDef  TIM_ICInitStructure; TIM_OCInitTypeDef  TIM_OCInitStructure; void RCC_Configuration(void); void GPIO_Configuration(void); int main(void) {   RCC_Configuration();   GPIO_Configuration();   TIM_TimeBaseStructure.TIM_Period = 65535;   TIM_TimeBaseStructure.TIM_Prescaler = 1;   TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   TIM_OCInitStructure.TIM_Pulse = 16383;   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   TIM_OC1Init(TIM2, &TIM_OCInitStructure);   TIM_ICStructInit(&TIM_ICInitStructure);   TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;   TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;   TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;   TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   TIM_ICInitStructure.TIM_ICFilter = 0;   TIM_ICInit(TIM2, &TIM_ICInitStructure);   TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);   TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);   TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);   while (1)   {} } void RCC_Configuration(void) {   SystemInit();   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); } void GPIO_Configuration(void) {   GPIO_InitTypeDef GPIO_InitStructure;   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_Init(GPIOA, &GPIO_InitStructure);   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   GPIO_Init(GPIOA, &GPIO_InitStructure);   GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE); } #ifdef  USE_FULL_ASSERT void assert_failed(uint8_t* file, uint32_t line) {   while (1)   {} } #endif --------------------------------------------------------------------------------- what am i doing wrong here? i can't seem to get the code no matter how i try. please help... much appreciated.