STM32 General Timer Configuration PWM problem

OID Tim3_init (void)

{

Tim_timebaseinittypedef tim_timebasestructure;

Tim_ocinittypedef tim_ocinitstructure;

/* PWM signal level hopping value */

U16 ccr1= 36000;

U16 Ccr2= 36000;

/*pclk1 after twice octave as TIM3 clock source equals 72mhz*/

Rcc_apb1periphclockcmd (RCC_APB1PERIPH_TIM3, ENABLE);

/* Time Base configuration */

Tim_timebasestructure.tim_period = 1599; Counting Cycle 1600

Tim_timebasestructure.tim_prescaler = 1; Set Prescaler: Prescaler = 2, which is 72/3=24mhz

tim_timebasestructure.tim_clockdivision = 0; Set the clock divider factor: no crossover

Tim_timebasestructure.tim_countermode = tim_countermode_up; Count overflow mode up

Tim_timebaseinit (TIM3, &tim_timebasestructure);

/* PWM1 Mode Configuration:channel1 */

Tim_ocinitstructure.tim_ocmode = TIM_OCMODE_PWM1; configured for PWM mode 1

Tim_ocinitstructure.tim_outputstate = tim_outputstate_enable;

Tim_ocinitstructure.tim_pulse = 600; Set the jump value, when the counter is counted to this value, the level of the transition occurs

Tim_ocinitstructure.tim_ocpolarity =tim_ocpolarity_low; High when the timer count value is less than CCR1

Tim_oc1init (TIM3, &tim_ocinitstructure); Enable Channel 1

Tim_oc1preloadconfig (TIM3, tim_ocpreload_enable);

/* PWM1 Mode Configuration:channel2 */

Tim_ocinitstructure.tim_outputstate = tim_outputstate_enable;

Tim_ocinitstructure.tim_pulse = 300; Set the level hopping value of Channel 2 and output the PWM of another duty-free ratio

tim_ocinitstructure.tim_ocpolarity = Tim_ocpolarity_high; Low when the timer count value is less than CCR2

Tim_oc2init (TIM3, &tim_ocinitstructure); Enable Channel 2

Tim_oc2preloadconfig (TIM3, tim_ocpreload_enable);

Tim_arrpreloadconfig (TIM3, ENABLE); Enable TIM3 Reload Register arr

/* TIM3 Enable counter */

Tim_cmd (TIM3, ENABLE);

Delay_8ms ();

Tim_cmd (TIM3, DISABLE);

}

STM32 General Timer Configuration PWM problem