STM32F4 PWM Problem

Kristoffer Ullsten Gast #4885709
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Hallo,

auf dem STM32F4 Discovery Board versuche ich die 3 Phasen PWMs mit den 
komplementären Ausgängen zu generieren. Seltsamerweise funktioniert es 
**nur** bei PA9 nicht. Weiss jemand woran es liegt. Ich habe die GPIO 
Timer sehr gründlich initialisiert.

1
    /* GPIOA GPIOB and GPIOC clock enable */

2
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

3
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

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    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

5


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    /* TIM1 clock enable APB2 = 84MHz */

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    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

8


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    GPIO_InitTypeDef GPIO_InitStructure;

10


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    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;

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    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

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    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

14
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;

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    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

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    GPIO_Init(GPIOA, &GPIO_InitStructure);

17


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    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);

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    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_TIM1);

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    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_TIM1);

21


22


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    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

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    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

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    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

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    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;

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    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

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    GPIO_Init(GPIOB, &GPIO_InitStructure);

29
    

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    GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_TIM1);

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    GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_TIM1);

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    GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_TIM1);

33


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    uint16_t TimerPeriod = 4200;

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    uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0;

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    /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */

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    Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

38


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    /* Compute CCR2 value to generate a duty cycle at 25%  for channel 2 */

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    Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);

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    /* Compute CCR3 value to generate a duty cycle at 12.5%  for channel 3 */

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    Channel3Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

44


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    /* PWM_fr = TIM_CLK_fr / (Prescaler + 1) / (Period + 1)  TIM_CLK_fr = 84MHz */

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    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

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    TIM_OCInitTypeDef  TIM_OCInitStructure;

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    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

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    TIM_TimeBaseStructure.TIM_Prescaler = 1;

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    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

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    TIM_TimeBaseStructure.TIM_Period = 4200 - 1;

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    TIM_TimeBaseStructure.TIM_ClockDivision = 0;

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    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

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    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

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    /* Channel 1, 2 and 3 Configuration in PWM mode */

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    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

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    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

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    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

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    TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;

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    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

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    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;

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    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

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    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;

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    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

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    TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;

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    TIM_OC2Init(TIM1, &TIM_OCInitStructure);

72
    

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    TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;

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    TIM_OC3Init(TIM1, &TIM_OCInitStructure);

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    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

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    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

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    TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

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    /* Automatic Output enable, Break, dead time and lock configuration*/

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    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;

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    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;

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    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;

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    TIM_BDTRInitStructure.TIM_DeadTime = 11;

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    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;

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    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;

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    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;

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    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

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    TIM_CCPreloadControl(TIM1, ENABLE);

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    TIM_ARRPreloadConfig(TIM1, ENABLE);

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    /* TIM1 counter enable */

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    TIM_Cmd(TIM1, ENABLE);

95


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    /* Main Output Enable */

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    TIM_CtrlPWMOutputs(TIM1, ENABLE);
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Kristoffer Ullsten Gast #4885717
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Die mittlere blau Kurve ist PA9. Ich bin am verzweifeln.

1
/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */

2
Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

3


4
/* Compute CCR2 value to generate a duty cycle at 25%  for channel 2 */

5
Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);

6


7
/* Compute CCR3 value to generate a duty cycle at 12.5%  for channel 3 */

8
Channel3Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

9


10
    while (1)

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    {

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        STM_EVAL_LEDToggle(LED3);

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        STM_EVAL_LEDToggle(LED4);

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        STM_EVAL_LEDToggle(LED5);

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        STM_EVAL_LEDToggle(LED6);

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        Delay(1e5);

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        TIM1->CCR1 = Channel3Pulse;

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        TIM1->CCR2 = Channel3Pulse;

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        TIM1->CCR3 = Channel3Pulse;

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    }
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Matthias S. (Firma: matzetronics) #4885855
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Freund Uwe B. hat die Pinbelegung des STM32F4 Disco sehr schön auf HTML:
http://mikrocontroller.bplaced.net/wordpress/wp-content/uploads/2013/03/Pinbelegung_v101.html
Aber mein Eindruck ist, das der Te auf dem Holzweg ist. Man macht ja 
keine um 120° verschobenen Phasen mit den CC Registern, sondern die 
dienen doch der Bestromung des Motors und damit der Drehzahl Steuerung.
Ausserdem verlegt man die ganzen Outputs des Timer1 am besten auf PE8 - 
PE13, die beim Disco Board frei sind und auch die komplementären Kanäle 
bereitstellen.
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