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Strange timer behaviour on PA6

Schildkroet opened this issue · comments

commented

Hello,

i am using a CH32V305RBT6.
I have setup equal PWM output on PA6 (TIM10) and PA7 (TIM8) with 20 KHz frequency and 25%

    // TIM clock enable
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_PinRemapConfig(GPIO_PartialRemap_TIM10, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Time base configuration
    TIM_TimeBaseInitStructure.TIM_Period = 400-1;
    TIM_TimeBaseInitStructure.TIM_Prescaler = 18-1;      // 4 MHz
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM10, &TIM_TimeBaseInitStructure);

    // Output Compare Toggle Mode configuration: Channel1
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 100;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    TIM_OC2Init(TIM10, &TIM_OCInitStructure);

    // Disable register preload
    TIM_CtrlPWMOutputs(TIM10, ENABLE);
    TIM_OC2PreloadConfig(TIM10, TIM_OCPreload_Enable);
    TIM_ARRPreloadConfig(TIM10, ENABLE);

    TIM_Cmd(TIM10, ENABLE);

    // TIM clock enable
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Time base configuration
    TIM_TimeBaseInitStructure.TIM_Period = 400-1;
    TIM_TimeBaseInitStructure.TIM_Prescaler = 18-1;      // 4 MHz
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStructure);

    // Output Compare Toggle Mode configuration: Channel1
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 100;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    TIM_OC1Init(TIM8, &TIM_OCInitStructure);

When i measure it, PA7 is correct:
image

But PA6 is NOT OK:
image

The duty cycle it lower than expected!

If i set duty cycle to 5%, PA7 is still correct, but PA6 does NOT ouput anything!
image

What am i doing wrong? Is this a bug?

commented

We have try it ,but do not have problems.
void TIM1_PWMOut_Init( u16 arr, u16 psc, u16 ccp )
{
GPIO_InitTypeDef GPIO_InitStructure={0};
TIM_OCInitTypeDef TIM_OCInitStructure={0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM10 | RCC_APB2Periph_AFIO, ENABLE );

  GPIO_PinRemapConfig(GPIO_PartialRemap_TIM10, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOA, &GPIO_InitStructure );

TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit( TIM10, &TIM_TimeBaseInitStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_OutputNState =TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = ccp;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;
TIM_OC2Init( TIM10, &TIM_OCInitStructure );

TIM_CtrlPWMOutputs(TIM10, ENABLE );
TIM_OC2PreloadConfig( TIM10, TIM_OCPreload_Disable );
TIM_ARRPreloadConfig( TIM10, ENABLE );
TIM_Cmd( TIM10, ENABLE );

}

void TIM8_PWMOut_Init( u16 arr, u16 psc, u16 ccp )
{
GPIO_InitTypeDef GPIO_InitStructure={0};
TIM_OCInitTypeDef TIM_OCInitStructure={0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM8 | RCC_APB2Periph_AFIO, ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOA, &GPIO_InitStructure );

TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
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_Disable;
TIM_OCInitStructure.TIM_OutputNState =TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = ccp;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;
TIM_OC1Init( TIM8, &TIM_OCInitStructure );

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

}

/*********************************************************************

  • @fn main
  • @brief Main program.
  • @return none
    */
    int main(void)
    {
    USART_Printf_Init(115200);
    SystemCoreClockUpdate();
    printf("SystemClk:%d\r\n",SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    TIM1_PWMOut_Init( 400-1, 18-1, 100 );//A6
    TIM8_PWMOut_Init( 400-1, 18-1, 100 );//A7
    while(1);
    }
commented

Hello,
i tried again and now i also cannot reproduce the problem. It seems i had some odd register settings since i was debugging the whole day without any power cycle.
Thanks for the support