STM32F10xxx TIMx PWM input mode

[hackerli90]

Posted on May 26, 2015 at 22:36

Hi

I cannot find the STM32F10xxx firmware library as described here: http://read.pudn.com/downloads106/sourcecode/embed/437624/stm32/STM32F%20Documents/Application%20Note/STM32F10xxx%20TIM%20application%20examples.pdf

I am searching for the ''TIM example 6'' to run STM32F10xxx TIMx PWM input mode.

Could you please post my the direct link to that file?

Thank you

[Tesla DeLorean]

Posted on May 26, 2015 at 23:04

It's an 8 year old document, would suggest you go to the ''Design Resources'' for your part, and download the Standard Peripheral Library (v3.5.0 for the F1)

This has at least one TIM PWM Input example, and there's got to be a few posted here to the forum if you dig a bit.

STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\TIM\PWM_Input

[hackerli90]

Posted on May 27, 2015 at 00:04

hi

thank you for your quick response, the directory works well.

do you know the directory link to the STM32F4 series as well?

[Tesla DeLorean]

Posted on May 27, 2015 at 00:30

STM32F4-Discovery_FW_v1.1.0\Project\Peripheral_Examples\TIM_PWM_Input

STM32F4xx_DSP_StdPeriph_Lib_V1.3.0\Project\STM32F4xx_StdPeriph_Examples\TIM\TIM_PWMInput

About 75% down this thread is a Servo example using PWM Input

https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/STM32%20Discovery%2c%20RC%20Receiver%2c%20PWM%20Input&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=1203

[hackerli90]

Posted on May 27, 2015 at 17:37

I am now working with the timer example for PWM in.

although i do not programm microcontrollers that often and could use some help, how can i now read the duty cycle or frequency in the pre setup programm within the while loop?

/**

  ******************************************************************************

  * @file    TIM/TIM_PWMInput/main.c 

  * @author  MCD Application Team

  * @version V1.1.0

  * @date    18-January-2013

  * @brief   Main program body

  ******************************************************************************

  * @path STM32F4xx_StdPeriph_Examples TIM_PWMInput

  ******************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include ''stm32f4xx.h''

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

TIM_ICInitTypeDef  TIM_ICInitStructure;

/* Private function prototypes -----------------------------------------------*/

void TIM_Config(void);

/* Private functions ---------------------------------------------------------*/

// ==============================================================================

// MAIN

// ==============================================================================

/**

  * @brief  Main program

  * @param  None

  * @retval None

  */

int main(void)

{

  /*!< At this stage the microcontroller clock setting is already configured, 

       this is done through SystemInit() function which is called from startup

       file (startup_stm32f40xx.s/startup_stm32f427x.s) before to branch to 

       application main.

       To reconfigure the default setting of SystemInit() function, refer to

       system_stm32f4xx.c file

     */

       

  /* TIM Configuration */

  TIM_Config();

  

  /* --------------------------------------------------------------------------- 

    TIM4 configuration: PWM Input mode

    In this example TIM4 input clock (TIM4CLK) is set to 2 * APB1 clock (PCLK1), 

    since APB1 prescaler is different from 1.   

      TIM4CLK = 2 * PCLK1  

      PCLK1 = HCLK / 4 

      => TIM4CLK = HCLK / 2 = SystemCoreClock /2

    External Signal Frequency = TIM4 counter clock / TIM4_CCR2 in Hz. 

    External Signal DutyCycle = (TIM4_CCR1*100)/(TIM4_CCR2) in %.

  --------------------------------------------------------------------------- */

  

  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 = 0x0;

  TIM_PWMIConfig(TIM4, &TIM_ICInitStructure);

  /* Select the TIM4 Input Trigger: TI2FP2 */

  TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);

  /* Select the slave Mode: Reset Mode */

  TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);

  TIM_SelectMasterSlaveMode(TIM4,TIM_MasterSlaveMode_Enable);

  /* TIM enable counter */

  TIM_Cmd(TIM4, ENABLE);

  /* Enable the CC2 Interrupt Request */

  TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);

  while (1);

}

// ==============================================================================

// ==============================================================================

// TIM_CONFIG

// ==============================================================================

/**

  * @brief  Configure the TIM4 Pins.

  * @param  None

  * @retval None

  */

void TIM_Config(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  NVIC_InitTypeDef NVIC_InitStructure;

  /* TIM4 clock enable */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  /* GPIOB clock enable */

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

  

  /* TIM4 chennel2 configuration : PB.07 */

  GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_7;

  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_UP ;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

  

  /* Connect TIM pin to AF2 */

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4);

  /* Enable the TIM4 global Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

}

// ==============================================================================

// ==============================================================================

// USE FULL ASSERT

// ==============================================================================

#ifdef  USE_FULL_ASSERT

/**

  * @brief  Reports the name of the source file and the source line number

  *         where the assert_param error has occurred.

  * @param  file: pointer to the source file name

  * @param  line: assert_param error line source number

  * @retval None

  */

void assert_failed(uint8_t* file, uint32_t line)

{

  /* User can add his own implementation to report the file name and line number,

     ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */

  while (1)

  {}

}

#endif

// ==============================================================================

[Tesla DeLorean]

Posted on May 27, 2015 at 17:43

You'd either have to get the interrupt handler to load the values into variables you could read later, or spin in your while() loop waiting for the appropriate CC1/CC2 event to flag, and reading the CCR1/CCR2 register then.

[hackerli90]

Posted on May 27, 2015 at 19:14

thank you for always answering that fast. i'd prefer the former solution processing the values through the interrupt handler. could you refer to an example of such coding?

[Tesla DeLorean]

Posted on May 27, 2015 at 20:19

i'd prefer the former solution processing the values through the interrupt handler. could you refer to an example of such coding?

Please review the thread cited earlier.

[hackerli90]

Posted on May 31, 2015 at 17:35

The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6hM&d=%2Fa%2F0X0000000btU%2FNzPyE9LtiW3uA_vZKwnTW8sQv10ghkrS4d0wCsqu604&asPdf=false

[Tesla DeLorean]

Posted on May 31, 2015 at 17:51

There are some assorted references to TIM3 still.

All peripheral pins (TIM, USART) need to be in AF mode (PP and AF) , and associated with a specific peripheral with a GPIO_PinAFConfig(). It's important to look at F4 code examples, the F1 configured pins slightly differently.

[hackerli90]

Posted on May 31, 2015 at 19:40

i do not understand them quite well to understand it. could ^you give me a code example?