TIM_Config

TIM_Config.c

void TIM_Config()
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_OCInitTypeDef TIM_OCInitStructure;
	uint16_t PrescalerValue;
	GPIO_InitTypeDef GPIO_InitStructure;

	/* TIM3 clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

	/* GPIO clock enable */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);

	/* GPIO configuration */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOE, &GPIO_InitStructure);

	/* Connect TIM3 pins to AF */
	GPIO_PinAFConfig(GPIOE, GPIO_PinSource5, GPIO_AF_TIM3);

	/* Compute the prescaler value */
	PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 96000) - 1;
	
	/* Time base configuration */
	TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
	TIM_TimeBaseStructure.TIM_Period = 48000;
	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_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 24000;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

	TIM_OC1Init(TIM3, &TIM_OCInitStructure);
	TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

	TIM_ARRPreloadConfig(TIM3, ENABLE);
	TIM_Cmd(TIM3, ENABLE);
}