Hello everyone, this is my first post here. I am actually working on custom pcb with a STM32F410RB, which is used to count an external signal.
To do this I use 2 timers, Timer 9 configured in internal clock and counting a 1 second period and generate an interrupt to read the Timer 5 configured in external clock mode 1.
My 1 second interrupt is working (I commute a GPIO to measure the period) but there is a WEIRD problem with the Timer 5 ! I put a waveform generator on the timer input and I can count something but there is /100 ratio on the value ! If I put 1Khz, I read 10 Hz...
My STM is working at 100MHz with an external oscillator of 25MHz and PLL settings.
I post here my Timers configuration
void init_Timer5() // Timer 5 32 bits, external clock mode on channel TI1(TI1FP1) on pin PB12
{
// Clock Enable on Timer 5
__HAL_RCC_TIM5_CLK_ENABLE();
TIM5->CR1 = 0x0084;
TIM5->CR2 = 0x0000;
TIM5->CCMR1 = 0x00000000; // input capture config on CH1, No Filter
TIM5->CCER = 0x0000; // input capture enabled
TIM5->SMCR = 0x00000057; // external clock mode 1; trigger on TI1FP1
TIM5->PSC = 0;
TIM5->CNT = 0;
TIM5->ARR = 0xffffffff; // 32bits
}
void init_Timer9() // Timer 9, clock interne 100MHz, interruption enable
{
// Clock Enable on Timer 9
__HAL_RCC_TIM9_CLK_ENABLE();
TIM9->CR1 = 0x0084;
TIM9->SMCR = 0x0000;
TIM9->PSC = 1999; // div par 2000; (100MHz / 10000 = 50kHz / 20µs)
TIM9->ARR = 49999; // 50000 counts * 20µs = 1 sec
TIM9->CNT = 0;
TIM9->DIER |= TIM_DIER_UIE; // Enable interrupt
HAL_NVIC_SetPriority(TIM1_BRK_TIM9_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_BRK_TIM9_IRQn);
NVIC_SetVector(TIM1_BRK_TIM9_IRQn, (uint32_t)&TIM1_BRK_TIM9_IRQHandler);
}
void init_GPIO()
{
__HAL_RCC_GPIOB_CLK_ENABLE(); // GPIO B ext clk pin
GPIO_InitTypeDef GPIO_InitStruct = {0};
/**TIM5 GPIO Configuration
PB12 ------> TIM5_CH1
*/
GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF2_TIM5;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
I cant find my problem, I did the same on a NUCLEO BOARD F767ZI and its working very well...
