STM32F4Discovery counter problem,

[alprof]

Posted on July 28, 2013 at 22:22

I have problem with timer - I want use one as simply counter of external impulses.

Now I have (with too many unnecessary settings), but counter not work. I want use eg. TIM1, then I should use GPIO setting as AF for TIM1_CH1?

gpio_pin_cfg(GPIOA, 8, GPIO_AF1_IN_FLOATING);

RCC->

APB2ENR

|= RCC_APB2ENR_TIM1EN; TIM1->

CCER

|= TIM_CCER_CC1E; TIM1->

CCR1

|= 2; TIM1->

SMCR

|= TIM_SMCR_ECE; TIM1->

SMCR

|= 7; TIM1->

CR2

|= TIM_CR2_TI1S; TIM1->

CCMR1

|= 1; TIM1->

CR1

|= TIM_CR1_CEN ;

[Tesla DeLorean]

Posted on July 29, 2013 at 00:05

This has a high probability of functioning as desired.

void TIM1_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* TIM1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* GPIOA Configuration: TIM1 CH1 (PA8) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
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);
/* Connect TIM1 pins to AF */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
TIM_TimeBaseStructure.TIM_Period = 65535; // TIM1 16-bit
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Select external clock source */
TIM_TIxExternalClockConfig(TIM1, TIM_TIxExternalCLK1Source_TI1, TIM_ICPolarity_Rising, 0);
/* Enable the timer */
TIM_Cmd(TIM1, ENABLE);
/* Main Output Enable, and Input */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

[alprof]

Posted on July 29, 2013 at 09:49

Ok, thank you. I not use SPL, but now I can compare.