stm8s TIM1’s One Pulse Mode problem

[ra.kadyrov9]

Posted on October 13, 2010 at 08:42

stm8s TIM1’s One Pulse Mode problem

[lowpowermcu]

Posted on May 17, 2011 at 15:10

Hi kadyrov,

Try to generate an update event before enabling counter. Hope that solves.

TIM1_DeInit();

 

 

TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 0xFF, 10);

 

 

TIM1_OC1Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE, 0x7F, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);

 

 

TIM1_SelectOnePulseMode(TIM1_OPMODE_SINGLE);

 

/* generate update event */

 

TIM1->EGR |= 0x01; /* or something like that */

 

 

TIM1_CtrlPWMOutputs(ENABLE);

 

 

TIM1_Cmd(ENABLE);

 

 

Tell me if it is OK.

Regards,

MCU Lüfter

 

[ra.kadyrov9]

Posted on May 17, 2011 at 15:10

Oh, problem is solved! Thanks lowpowermcu!

TIM1->EGR is set to 0x01 in TIM1_DeInit(), but then it is disabled in TIM1_OC1Init() for some reason. I set it by TIM1_GenerateEvent(TIM1_EVENTSOURCE_UPDATE) again and now Update Event occurs at the right moment. Here is fixed code:

TIM1_DeInit();

 

TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 0xFF, 10);

 

TIM1_OC1Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE, 0x7F, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);

 

TIM1_SelectOnePulseMode(TIM1_OPMODE_SINGLE);

 

TIM1_GenerateEvent(TIM1_EVENTSOURCE_UPDATE);

 

TIM1_CtrlPWMOutputs(ENABLE);

 

TIM1_Cmd(ENABLE);

Hi kadyrov,

Try to generate an update event before enabling counter. Hope that solves.

TIM1_DeInit();

 

 

TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 0xFF, 10);

 

 

TIM1_OC1Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE, 0x7F, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_LOW, TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);

 

 

TIM1_SelectOnePulseMode(TIM1_OPMODE_SINGLE);

 

/* generate update event */

 

TIM1->EGR |= 0x01; /* or something like that */

 

 

TIM1_CtrlPWMOutputs(ENABLE);

 

 

TIM1_Cmd(ENABLE);

 

 

Tell me if it is OK.

Regards,

MCU Lüfter