Posted on October 25, 2010 at 14:28hi
i am trying to activte TIM1 in complementary mode with dead time.
but for some reason i get areverse dead time (both channels are at ''1'' instade of ''0'')
why is that i could not find such an option in the manual probebly missed something but what?
thanks.
#include ''stm32F10x.h''
void setsystemclock(void);
int main(void)
{
setsystemclock(); //set system clock to 24Mhz
//rcc configuration
RCC->APB2ENR= RCC_APB2ENR_IOPBEN |RCC_APB2ENR_IOPAEN | RCC_APB2ENR_TIM1EN |RCC_APB2ENR_AFIOEN ;
//GPIO configuration
GPIOB->CRH=0xbb00000;//alternative function output up to 50mhz PB pins 0,1
GPIOA->CRH=0x0bb;//alternative function output up to 50mhz PB pins 0,1
TIM1->ARR=1374; /* Set the Autoreload Register value (Count/f)=(1/(wanted freq))*/
TIM1->EGR=TIM_EGR_UG;/*!<Update Generation */
TIM1->CR2=TIM_CR2_OIS1 ; /*!<Output Idle state 2 (OC2 output) */
TIM1->CCMR1=TIM_CCMR1_OC1M ; /*!<OC1M[2:0] bits (Output Compare 1 Mode) */
TIM1->CCR1=480; /* Set the Capture Compare1 Register value (Duty Cycle)*/
TIM1->CCER=TIM_CCER_CC1E |TIM_CCER_CC1NE | TIM_CCER_CC1P | TIM_CCER_CC1NP ; /*!<Capture/Compare 1 output enable */
TIM1->CCMR1|=TIM_CCMR1_OC1PE ; /*!<Output Compare 1 Preload enable */
TIM1->CR1=TIM_CR1_ARPE; /*!<Auto-reload preload enable */
TIM1->BDTR=TIM_BDTR_OSSR| TIM_BDTR_OSSI | TIM_BDTR_LOCK_0 | 2 | TIM_BDTR_BKE | TIM_BDTR_BKP | TIM_BDTR_AOE;
TIM1->CR1=TIM_CR1_CEN; /*!<Counter enable */
TIM1->BDTR=TIM_BDTR_MOE;
while(1)
{
}
}
void setsystemclock(void)
{
RCC->CR |= RCC_CR_HSEON;
// Wait until it's ready
while ((RCC->CR & RCC_CR_HSERDY) == 0)
;
// Select PREDIV1 as PLL source and sett PLL mul to 3 (set bit 0)
// for 8*3 = 24 MHz
RCC->CFGR |= RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL_0;
// Start PLL
RCC->CR |= RCC_CR_PLLON;
// Wait until it's ready
while ((RCC->CR & RCC_CR_PLLRDY) == 0)
;
// Select PLL as system clock
RCC->CFGR |= RCC_CFGR_SW_PLL;
// Here we can check if PLL is used, and maybe disable HSI
// Disable HSI
RCC->CR &= ~RCC_CR_HSION;
RCC->CFGR|=RCC_CFGR_MCO_2; //sys clock output
}
