Knife
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Hi Everybody
I want to measure 3 different PWM signal and using STM8S. PWM signal duty is changing between 0% and 100%. System start 0%, 100% or any value between 0% and 100%. I am using an optocoupler and I'm getting reversed of input PWM. Also I reversed again when I calculate duty and I get real duty.
I'm catching 0% and 100% values an 6ms timeout timer in main program. I'm using TIM2 for this. I can catch all values when I apply a input PWM. If I apply second or third channel or all of them, I can not catch 2-3% PWM each channel. I read random variables.
I think that is cause from resetting TIM1 counter (TIM1_SetCounter(0x00)
I want to measure 3 different PWM signal and using STM8S. PWM signal duty is changing between 0% and 100%. System start 0%, 100% or any value between 0% and 100%. I am using an optocoupler and I'm getting reversed of input PWM. Also I reversed again when I calculate duty and I get real duty.
I'm catching 0% and 100% values an 6ms timeout timer in main program. I'm using TIM2 for this. I can catch all values when I apply a input PWM. If I apply second or third channel or all of them, I can not catch 2-3% PWM each channel. I read random variables.
I think that is cause from resetting TIM1 counter (TIM1_SetCounter(0x00)
Code:
void Initialize(void)
{
CLK_DeInit();
CLK_HSICmd(ENABLE);
CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV1);
TIM1_DeInit();
TIM1_TimeBaseInit(63, TIM1_COUNTERMODE_UP, 0xFFFF, 0);
TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
TIM1_ICInit( TIM1_CHANNEL_2, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
TIM1_ICInit( TIM1_CHANNEL_3, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
TIM1_Cmd(ENABLE);
TIM1_ITConfig(TIM1_IT_CC1, ENABLE);
TIM1_ITConfig(TIM1_IT_CC2, ENABLE);
TIM1_ITConfig(TIM1_IT_CC3, ENABLE);
TIM2_DeInit();
TIM2_TimeBaseInit(TIM2_PRESCALER_1, 32000); //4ms period
TIM2_PrescalerConfig(TIM2_PRESCALER_1, TIM2_PSCRELOADMODE_IMMEDIATE);
TIM2_Cmd(ENABLE);
TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
enableInterrupts();
}
void main(void)
{
Initialize();
while (1)
{
if (wPWM1_Capture_Tick > 2)//6ms timeout
{
if(GPIO_ReadInputPin(GPIOC, GPIO_PIN_1) != 0)
{
wPWM1_PWM = 0x00;
}
else
{
wPWM1_PWM = 0xFF;
}
wPWM1_Capture_Tick = 0;
}
if (wPWM2_Capture_Tick > 2)
{
if(GPIO_ReadInputPin(GPIOC, GPIO_PIN_2) != 0)
{
wPWM2_PWM = 0x00;
}
else
{
wPWM2_PWM = 0xFF;
}
wPWM2_Capture_Tick = 0;
}
if (wPWM3_Capture_Tick > 2)
{
if(GPIO_ReadInputPin(GPIOC, GPIO_PIN_2) != 0)
{
wPWM3_PWM = 0x00;
}
else
{
wPWM3_PWM = 0xFF;
}
wPWM3_Capture_Tick = 0;
}
}
}
INTERRUPT_HANDLER(TIM2_UPD_OVF_BRK_IRQHandler, 13)
{
if(bPWM1_Capture_Tick_Enable == TRUE)
wPWM1_Capture_Tick++;
if(bPWM2_Capture_Tick_Enable == TRUE)
wPWM2_Capture_Tick++;
if(bPWM3_Capture_Tick_Enable == TRUE)
wPWM3_Capture_Tick++;
TIM2_ClearITPendingBit(TIM2_IT_UPDATE);
}
INTERRUPT_HANDLER(TIM1_CAP_COM_IRQHandler, 12)
{
if((TIM1->SR1 & TIM1_FLAG_CC1) == TIM1_FLAG_CC1)
{
TIM1_ClearFlag(TIM1_FLAG_CC1);
switch(byPWM1_State)
{
case 0 :
byPWM1_State = 1;
bCapture_Timer_Reset = TRUE; //TIM1 Counter Reset
TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
bPWM1_Capture_Tick_Enable = TRUE;
break;
case 1 :
byPWM1_State = 2;
wPWM1_On_Time = TIM1_GetCapture1();
TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
break;
case 2 :
byPWM1_State = 1;
wPWM1_Period = TIM1_GetCapture1();
bCapture_Timer_Reset = TRUE; //TIM1 Counter Reset
wPWM1_PWM = ((1000 * (DWORD)wPWM1_On_Time) / wPWM1_Period) / 4; //0xFF Max. Value
TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
wPWM1_Capture_Tick = 0;
break;
}
}
if((TIM1->SR1 & TIM1_FLAG_CC2) == TIM1_FLAG_CC2)
{
TIM1_ClearFlag(TIM1_FLAG_CC2);
switch(byPWM2_State)
{
case 0 :
byPWM2_State = 1;
bCapture_Timer_Reset = TRUE;
TIM1_ICInit( TIM1_CHANNEL_2, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
bPWM2_Capture_Tick_Enable = TRUE;
break;
case 1 :
byPWM2_State = 2;
wPWM2_On_Time = TIM1_GetCapture2();
TIM1_ICInit( TIM1_CHANNEL_2, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
break;
case 2 :
byPWM2_State = 1;
wPWM2_Period = TIM1_GetCapture2();
bCapture_Timer_Reset = TRUE;
wPWM2_PWM = ((1000 * (DWORD)wPWM2_On_Time) / wPWM2_Period) / 4;
TIM1_ICInit( TIM1_CHANNEL_2, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
wPWM2_Capture_Tick = 0;
break;
}
}
if((TIM1->SR1 & TIM1_FLAG_CC3) == TIM1_FLAG_CC3)
{
TIM1_ClearFlag(TIM1_FLAG_CC3);
switch(byPWM3_State)
{
case 0 :
byPWM3_State = 1;
bCapture_Timer_Reset = TRUE;
TIM1_ICInit( TIM1_CHANNEL_3, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
bPWM3_Capture_Tick_Enable = TRUE;
break;
case 1 :
byPWM3_State = 2;
wPWM3_On_Time = TIM1_GetCapture3();
TIM1_ICInit( TIM1_CHANNEL_3, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
break;
case 2 :
byPWM3_State = 1;
wPWM3_Period = TIM1_GetCapture3();
bCapture_Timer_Reset = TRUE;
wPWM3_PWM = ((1000 * (DWORD)wPWM3_On_Time) / wPWM3_Period) / 4;
TIM1_ICInit( TIM1_CHANNEL_3, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,
TIM1_ICPSC_DIV1, 0x0);
wPWM3_Capture_Tick = 0;
break;
}
}
if(bCapture_Timer_Reset == TRUE)
{
bCapture_Timer_Reset = FALSE;
TIM1_SetCounter(0x00);
}
}