STM32F407: TIM8 PWM->PC6

[Markus C. (ljmarkus)]

Guten Morgen,

versuche nun schon ein paar Stunden den PWM auf PC6 per TIM8 zumlaufen 
zubringen.
Habe ich was vergessen?

//---------------------------------------------------------------------------
void PWM_Init()
{
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;      
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM8);  // PC6 -> TIM8 Channel 1

  // TIM8 Clock enable
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

  // Timer 8 Config PWM
  TIM_TimeBaseInitStructure.TIM_Period = 0xFF;
  TIM_TimeBaseInitStructure.TIM_Prescaler = 127;
  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 127;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM8, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM8, ENABLE);
  TIM_Cmd(TIM8, ENABLE);

  TIM8->CCR1 = 63;
}

lg, markus

[123 (Gast)]

Hi,,
ich glaube du musst den Timer auch noch starten. den Befehl sehe ichh 
nicht
mfg

[123 (Gast)]

Activate the TIM peripheral using one of the start functions depending 
from the
feature used:
 Time Base : HAL_TIM_Base_Start(), HAL_TIM_Base_Start_DMA(),
HAL_TIM_Base_Start_IT()
 Input Capture : HAL_TIM_IC_Start(), HAL_TIM_IC_Start_DMA(),
HAL_TIM_IC_Start_IT()
 Output Compare : HAL_TIM_OC_Start(), HAL_TIM_OC_Start_DMA(),
HAL_TIM_OC_Start_IT()
 PWM generation : HAL_TIM_PWM_Start(), HAL_TIM_PWM_Start_DMA(),
HAL_TIM_PWM_Start_IT()
 One-pulse mode output : HAL_TIM_OnePulse_Start(),
HAL_TIM_OnePulse_Start_IT()
 Encoder mode output : HAL_TIM_Encoder_Start(),
HAL_TIM_Encoder_Start_DMA(), HAL_TIM_Encoder_Start_IT().

Du musst denke ich entspechend den Befehl der StdPerphLib verwenden

[aSma>> (Gast)]

Servus,
Tim1&Tim8 sind advanced pwm outputs mit komplementären Ausgängen. Diese 
eignen sich perfekt für Motorsteuerung...

Aber wenn du diese Schiene weiterhin fahren willst:

TIM_CtrlPWMOutputs(TIM8,ENABLE);

fehlt am Ende.

[Thor (Gast)]

Wirf mal einen Blick auf
http://stm32f4-discovery.com/2014/05/stm32f4-stm32f429-discovery-pwm-tutorial/

[Markus C. (ljmarkus)]

Hallo.

Danke für die Hinweise.

folgendes fehlte:

TIM_OCStructInit(&TIM_OCInitStructure);

TIM_CtrlPWMOutputs(TIM8, ENABLE);

So funktioniert es jetzt:

void PWM_Init()
{
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;      
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM8);  // PC6 -> TIM8 Channel 1

  // TIM8 Clock enable
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

  // Timer 8 Config PWM
  TIM_TimeBaseInitStructure.TIM_Period = 0xFF;
  TIM_TimeBaseInitStructure.TIM_Prescaler = 0xFF;
  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStructure);

  TIM_OCStructInit(&TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM8, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM8, ENABLE);
  TIM_Cmd(TIM8, ENABLE);
  TIM_CtrlPWMOutputs(TIM8, ENABLE);

  TIM8->CCR1 = 63;
}

lg, markus