Associate II

Question

TIMER STM32F429-DISCO

4 replies
1194 views

Posted on July 01, 2014 at 09:10

Hi,

i use the timer 10 to toggle a GPIO with a board STM32F429-DISCO.

int

init_timer

(

void

)

{

TIM_TimeBaseInitTypeDef

TIM_TimeBaseStructure;

NVIC_InitTypeDef

NVIC_InitStructure;

RCC_APB2PeriphClockCmd (

RCC_APB2Periph_TIM10

,

ENABLE

);

NVIC_InitStructure.NVIC_IRQChannel

=

TIM1_UP_TIM10_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority

=

0

;

NVIC_InitStructure.NVIC_IRQChannelSubPriority

=

1

;

NVIC_InitStructure.NVIC_IRQChannelCmd

=

ENABLE

;

NVIC_Init

(

&NVIC_InitStructure

);

// systemclock 180M BOARD STM32F429-DISCO

TIM_TimeBaseStructure.TIM_CounterMode

=

TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_Prescaler

=

36000;

TIM_TimeBaseStructure.TIM_Period = 100;

TIM_TimeBaseInit

(

TIM10

,

&TIM_TimeBaseStructure);

TIM_Cmd

(

TIM10

,

ENABLE

);

TIM_ITConfig

(

TIM10

,

TIM_IT_Update

,

ENABLE

);

return

true

;

}

void

TIM1_UP_TIM10_IRQHandler

(

void

)

{

if

(

TIM_GetITStatus

(

TIM10

,

TIM_IT_Update

)

!=

RESET

)

{

TIM_ClearITPendingBit

(

TIM10

,

TIM_IT_Update

);

GPIO_ToggleBits(

GPIOG

,

GPIO_Pin_14); //toggle every 20 msec

}

I would like to modify the init_timer() function in order to generate an interrupt every 100 expernal pulse in the pin PA6 with the TIM10.

I have modified the function init_timer in this way

int

init_timer_new

(

void

)

{

TIM_TimeBaseInitTypeDef

TIM_TimeBaseStructure;

NVIC_InitTypeDef

NVIC_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel

=

TIM1_UP_TIM10_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority

=

0

;

NVIC_InitStructure.NVIC_IRQChannelSubPriority

=

1

;

NVIC_InitStructure.NVIC_IRQChannelCmd

=

ENABLE

;

NVIC_Init

(

&NVIC_InitStructure

);

RCC_APB2PeriphClockCmd (

RCC_APB2Periph_TIM10

,

ENABLE

);

// systemclock 180M BOARD STM32F429-DISCO

TIM_TimeBaseStructure.TIM_CounterMode

=

TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_Prescaler

=

0

;

TIM_TimeBaseStructure.TIM_Period

=

100

;

TIM_TimeBaseInit

(

TIM10

,

&TIM_TimeBaseStructure);

/* Connect TIM10 - pins to AF */

/* GPIOA clock enable */

RCC_AHB1PeriphClockCmd

(

RCC_AHB1Periph_GPIOA,

ENABLE

);

/* GPIOA Configuration: TIM10 CH1 (PA6) */

GPIO_InitTypeDef

GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin

=

GPIO_Pin_6

;

GPIO_InitStructure.GPIO_Mode

=

GPIO_Mode_AF;

// Input/Output controlled by peripheral

GPIO_InitStructure.GPIO_Speed

=

GPIO_Speed_100MHz;

GPIO_InitStructure.GPIO_OType

=

GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd

=

GPIO_PuPd_UP;

// Button to ground expectation

GPIO_Init

(

GPIOA

,

&GPIO_InitStructure

);

GPIO_PinAFConfig

(

GPIOA

,

GPIO_PinSource6

,

GPIO_AF_TIM10

);

TIM_TIxExternalClockConfig

(

TIM10

,

TIM_TIxExternalCLK1Source_TI1

,

TIM_ICPolarity_Rising

,

0

);

TIM_Cmd

(

TIM10

,

ENABLE

);

TIM_ITConfig

(

TIM10

,

TIM_IT_Update

,

ENABLE

);

return

true

;

}

However, with this change it doesn�t work!!!

Is there any flaw in my code?

#timer #interrupt #stm32f429

This topic has been closed for replies.

Tesla DeLorean

Guru

Posted on July 01, 2014 at 14:39

However, with this change it doesn?t work!!!

Is there any flaw in my code?

The biggest one would seem to be your random association of PA6 with TIM10_CH1, you can't just make this stuff up, you have limited options as described in the Data Sheet/Manual.

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gerson74Author

Associate II

Posted on August 07, 2014 at 15:30

Thank's Clive for the reply!!!

Now i use the timer13 ch1.

I would like generate an interrupt after a number N of external pulse in the pin PA6 with the TIM13.

Can you help me with a example??

What should I use? The timer input capture?Configure the timer with TIM_TIxExternalClockConfig???

Thank's

Tesla DeLorean

Guru

Posted on August 07, 2014 at 18:30

Pretty sure that TIM13 can't use an external clock source.

TIM3, a quick blind build

// STM32F429I-DISCO TIM3 (CH1 PA6) External Count Demo - sourcer32@gmail.com
#include ''stm32f429i_discovery.h''
//****************************************************************************
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* pin configuration */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM3); // PA6 TIM3_CH1
}
//****************************************************************************
void TIM3_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
int i;
/* Enable TIM3 Peripheral clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_Period = 100 - 1; // 100 (16-bit counter)
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_TIxExternalClockConfig(TIM3, TIM_TIxExternalCLK1Source_TI1, TIM_ICPolarity_Rising, 0);
TIM_Cmd(TIM3, ENABLE);
// Likely will interrupt initially unless we clear it
for(i=0; i<3; i++)
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
// Could also use compare mode, set the counter maximal and advance CCRx 100 ticks at a time
}
//****************************************************************************
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
/* Toggle LED3 */
STM_EVAL_LEDToggle(LED3);
}
}
//****************************************************************************
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//****************************************************************************
int main(void)
{
/* Initialize Leds mounted on STM32F429I-DISCO board */
STM_EVAL_LEDInit(LED3);
/* Turn on LED3 */
STM_EVAL_LEDOn(LED3);
NVIC_Configuration();
GPIO_Configuration();
TIM3_Configuration();
while(1); // Do not exit
}
//******************************************************************************
#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

'', file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
//******************************************************************************

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gerson74Author

Associate II

Posted on August 08, 2014 at 08:15

Ok!!!

Can i use the Input Capture Mode with the TIM13 and achieve the same result??

Unfortunately I can not use TIM3 because it is already used for another calculation.

Thank's

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