[OT ITA] Lo spamm bar (Part 1)

Community Bar Sport
1154

puff, finalmente ho messo in piedi qualcosa...
il PWM per la stm32f4, però non so se funziona (finito or ora!), posto il codice così magari qualcuno a caso ( :roll_eyes:) mi da una correzione

volatile uint16_t position[] = { 1000, 1000, 1000, 1000 }; //from 1000 to 2000

void TIM3_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
  {
    TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

    TIM3->CCR1 = position[0]; //PB0
    TIM3->CCR2 = position[1]; //PB1
    TIM3->CCR3 = position[2]; //PB4
    TIM3->CCR4 = position[3]; //PB5
  }
}

void startPWM(){

	/*
	 * BASED ON https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32VLDiscovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32VLDiscovery/Servo%20control%20using%20STM32VLDiscovery&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000491D59B8574F8049B5DFA3E8B21CBA51&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32VLDiscovery/AllItems.aspx&currentviews=397
	 * THANKS to Clive1
	 * */

	// clock for GPIO and AFIO (Remap) - WHY THIS?
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
	// clock for TIM3 - HERE DO WE ENABLE TIM3 HW?
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

	// PIN SETUP
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_StructInit(&GPIO_InitStructure); //Reset init structure
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	//THIS?
	GPIO_PinRemapConfig( GPIO_FullRemap_TIM3, ENABLE );        // Map TIM3_CH3 to GPIOB.Pin0, GPIOB.Pin1, GPIOB.Pin4, GPIOB.Pin5

	//OR THIS?
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_TIM3);
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_TIM3);
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_TIM3);
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_TIM3);


	//TIMER INTERRUPT SETUP
	NVIC_InitTypeDef NVIC_InitStructure;

	// Configure the NVIC Preemption Priority Bits
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

	// Enable the TIM3 Interrupt
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);


	//TIMER SETUP
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_TimeBaseStructInit( &TIM_TimeBaseStructure ); // Reset init structure

	// Simplify the math here so TIM_Pulse has 1 us units
	// PWMFreq = SystemCoreClock / ((TIM_Prescaler + 1) * (TIM_Period + 1));
	
	// NOT VERY SURE THE TIM3 RUN AT 24MHz....
	
	TIM_TimeBaseStructure.TIM_Prescaler = 24 - 1;  // 24 MHz / 24 = 1 MHz
	TIM_TimeBaseStructure.TIM_Period = 20000 - 1; // 1 MHz / 20000 = 50 Hz (20 ms)
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit( &TIM_OCInitStructure );

	// PWM1: Channel1, PB0
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_Pulse = position[0];
	TIM_OC1Init(TIM3, &TIM_OCInitStructure);

	// PWM1: Channel2, PB1
	TIM_OCInitStructure.TIM_Pulse = position[1];
	TIM_OC2Init(TIM3, &TIM_OCInitStructure);

	// PWM1: Channel3, PB4
	TIM_OCInitStructure.TIM_Pulse = position[2];
	TIM_OC3Init(TIM3, &TIM_OCInitStructure);

	// PWM1: Channel4, PB5
	TIM_OCInitStructure.TIM_Pulse = position[3];
	TIM_OC4Init(TIM3, &TIM_OCInitStructure);


	// ENABLE TIMER
	TIM_Cmd( TIM3, ENABLE );

    TIM_CtrlPWMOutputs(TIM3, ENABLE);

    // TIM IT enable
    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
}