STM8, STM8S003F3P6 realize PWM control motor HAS10227

background

There is a project that needs to control the speed of a fan, using STM8S003F3P6 to output PWM control, here is a detailed record of the debugging record

schematic diagram

The schematic diagram is relatively simple, the motor interface CN3

Motor Interface Schematic

The location of the connection with the MCU pins is shown in the figure below

First of all, we need to understand the principle of the motor

Simply put, a motor is an electrical equipment that realizes the mutual conversion of electrical energy and mechanical energy.

Then the principle of DC motor that we often use is:

Electric magnetism: The energized wire will generate a magnetic field, that is, the electromagnetic induction rotating magnetic field to drive the rotor to rotate. The motor is composed of a stator and a rotor. One generates a rotating magnetic field and the other is a magnetic pole. The rotor (bearing) of the motor rotates.

This realizes the conversion of electrical energy -> magnetic energy -> mechanical energy

The following two figures can be more intuitively understood:

So we don't go into details about the motor, we just need to know that the essence of the motor is the coil or the inductance element

At the same time, we know that inductance has the effect of preventing sudden changes in current

About Motor HAS10227

I don’t know who it is. I chose a Japanese motor. The manuals are all in Japanese. It looks tired.

 The corresponding pin is probably to control the VSP voltage to modulate the motor speed

 That is, corresponding to CN3 label 5

Here is to use pwm to adjust the voltage, and then achieve the purpose of controlling the speed

software design

pwm initialization, use timer 1 to output pwm

void Tim1_PWM_Init(void)
{  
  TIM1_DeInit();

  /* Time Base configuration */
  /*
  TIM1_Period = 4095
  TIM1_Prescaler = 0
  TIM1_CounterMode = TIM1_COUNTERMODE_UP
  TIM1_RepetitionCounter = 0
  */

  //TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 4095, 0);
  TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 1600 - 1, 0);//10KHZ

  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  
  /*
  TIM1_OCMode = TIM1_OCMODE_PWM2
  TIM1_OutputState = TIM1_OUTPUTSTATE_ENABLE
  TIM1_OutputNState = TIM1_OUTPUTNSTATE_ENABLE
  TIM1_Pulse = CCR1_Val
  TIM1_OCPolarity = TIM1_OCPOLARITY_LOW
  TIM1_OCNPolarity = TIM1_OCNPOLARITY_HIGH
  TIM1_OCIdleState = TIM1_OCIDLESTATE_SET
  TIM1_OCNIdleState = TIM1_OCIDLESTATE_RESET
  
  */
  //TIM1_OC1Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE,
  //             CCR1_Val, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
  //             TIM1_OCNIDLESTATE_RESET); 

  /*TIM1_Pulse = CCR2_Val*/
  //TIM1_OC2Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE, CCR2_Val,
  //             TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET, 
  //            TIM1_OCNIDLESTATE_RESET);

  
  
  /*The TIM1 CCR3 register value is equal to 0x3FF, so the TIM1 Channel 3 and TIM1 
  Channel 3N generate a PWM signal with a frequency equal to 488.28 Hz 
  and a duty cycle equal to:
  TIM1 Channel3 duty cycle = TIM1_CCR3 / ( TIM1_Period + 1) = 25%.*/
  /*TIM1_Pulse = CCR3_Val*/
  TIM1_OC3Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_ENABLE,
               CCR3_Val, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
               TIM1_OCNIDLESTATE_RESET);

  /*TIM1_Pulse = CCR4_Val*/
  //TIM1_OC4Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_ENABLE, CCR4_Val, TIM1_OCPOLARITY_LOW,
  //             TIM1_OCIDLESTATE_SET);

  /* TIM1 counter enable */
  TIM1_Cmd(ENABLE);

  /* TIM1 Main Output Enable */
  TIM1_CtrlPWMOutputs(DISABLE);  
  
}

It can be seen from the manual that PC3 is the control pin of PWM, which is also the pin of the schematic design just now.

To control the motor speed is to adjust the output of PWM, as shown in the following function

void setSpeed(void)
{
   CCR3_Val =   ((uint16_t)1120) - ((uint16_t) 112) * (5 - speed);//最大70%，每次递减7%
   TIM1->CCR3H = (uint8_t)(CCR3_Val >> 8);
   TIM1->CCR3L = (uint8_t)(CCR3_Val);
   TIM1_CtrlPWMOutputs(ENABLE); 
}