Posted on April 23, 2014 at 16:36Is the (ST ) stm32f407VG, the discovery board.
some code...
===============================================================
/* enable the clock for the two timers */
.......
else if (p_TimNum == TIM9)
{
RCC -> APB2ENR |= (1UL << 16); /* Enable clock on timer 9*/
}
else if (p_TimNum == TIM12)
{
RCC -> APB1ENR |= (1UL << 6); /* Enable clock on timer 12 */
}
......
......
/ * the GPIO PE5 PWM input set up for TIM9 */
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOEEN; /* Enable GPIOE clock */
GPIOE -> MODER |= ((uint32_t)(2UL << 10)); /* set pin PE_5 as alternate function */
GPIOE -> OTYPER &= ~((uint32_t)(1UL << 5)); /* set pin PE_5 push-pull output */
GPIOE -> OSPEEDR |= ((uint32_t)(3UL << 10)); /* set pin PE_5 high speed */
GPIOE -> PUPDR |= ((uint32_t)(2UL << 10)); /* set pin PE_5 pull-up */
GPIOE -> AFR[0] |= ((uint32_t)(3UL << 20)); /* set AF3, timer9 */
/* the PE6 GPIO PWM input set up for TIM12 */ RCC->AHB1ENR |= RCC_AHB1ENR_GPIOEEN; /* Enable GPIOE clock */
GPIOE -> MODER |= ((uint32_t)(2UL << 12)); /* set pin PE_6 as alternate function */
GPIOE -> OTYPER &= ~((uint32_t)(1UL << 6)); /* set pin PE_6 push-pull output */
GPIOE -> OSPEEDR |= ((uint32_t)(3UL << 12)); /* set pin PE_6 high speed */
GPIOE -> PUPDR |= ((uint32_t)(2UL << 12)); /* set pin PE_6 pull-up */
GPIOE -> AFR[0] |= ((uint32_t)(9UL << 24)); /* set alternate function AF9, timer12 */
==============================================================
I am now debugging and when supply the PWM input to TIM9 I can view the CCR1 and CCR2 register with a valid count: when I do it in turn for TIM12 I see CCR1 and
CCR2 stuck at zero... A part from ISR results, I should view the TIM12 counter running..
If needed I'll give further details.
Thank you Clive.
