TIM3 on STM32F100RCT only CH1 giving PWM

[pchala]

Posted on June 24, 2014 at 23:21

Does anyone have such issue?

/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* AFIO enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
/*Configure GPIO pin */
setOPin(GPIOC, GPIO_Pin_9 | GPIO_Pin_8| GPIO_Pin_7| GPIO_Pin_6, GPIO_Mode_AF_PP, GPIO_Speed_50MHz);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t PrescalerValue = 0;
/* Compute the prescaler value */
PrescalerValue = (uint16_t)(SystemCoreClock / 24000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 11999;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 12000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);
TIM3->CCR4 = 4000;
TIM3->CCR3 = 4000;
TIM3->CCR2 = 4000;
TIM3->CCR1 = 4000;
while
(1) {
}

I have output only on PC6. Where is the error?

[Tesla DeLorean]

Posted on June 25, 2014 at 00:21

Might help if you initialize all the channels.
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 4000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure); 
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC2Init(TIM3, &TIM_OCInitStructure); 
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC3Init(TIM3, &TIM_OCInitStructure); 
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC4Init(TIM3, &TIM_OCInitStructure); 
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

[pchala]

Posted on June 26, 2014 at 11:16

Thank you clive1,

Now it is working like a charm!