STM8S003F3 使用TIM1_CH1与TIM1_CH2配置PWM输出

      最近一个项目，用的是STM8S003F3这款小型的MCU，使用TIM1_CH1 TIM_CH2作为PWM输出时，遇到了问题，代码下载后，PWM是没有任何输出的。用示波器看，应该是PWM没有任何输出。

      首先在网上找了下资料，又看了官方的例程，感觉代码没有问题。后来仔细查看问题，终于找到解决的方案。

原来根据STM8S003F3的数据手册，需要配置一个选项字节才能使能TIM1_CH1与TIM1_CH2。

 

 

 

配置的方法有两种：

（1）使用STVP（STM32与STM8）烧写的软件，在烧写固件时，配置一下，下载到芯片，其实这个保存在DataFlash中，理论上配置一次，再使用ST-LINK下载，就一直生效。

 

 

（2）方法二，STM8S的固件库里，是有编程这个选项字节的功能的，只需要调用，在初始化时把相应的字节编程一下即可，重启生效，然后就可以一直使用了。

 

#ifdef __ENABLE_TIM1_CH1_CH2__

#define TIM1_OptionAddr (0x4803)        //OPT2 BIT1

void Enable_TIM1_CH1CH2_OptionByte(void)
{
  uint16_t TIM1_Option_status;/*记录激活备选功能Beep/TIM2_CH1的状态*/
  TIM1_Option_status = FLASH_ReadOptionByte(TIM1_OptionAddr);
  /* ARF0 BIT: 1 enable TIM1 CH1 CH2 */
  if((TIM1_Option_status&0x0100) == 0x00)
  {
    FLASH_Unlock(FLASH_MEMTYPE_DATA);
    FLASH_ProgramOptionByte(TIM1_OptionAddr, (uint8_t)(0x01));
    FLASH_Lock(FLASH_MEMTYPE_DATA);
    /*使能TIM1 CH1 CH2 PWM */
    Delay_ms(10);
    WWDG_SWReset();
  }
}
#endif

 

STM8S003F3的TIM1 配置PWM的代码如下：

 

void TIM1_PWM_Init(void)
{
  GPIO_Init(PWM1_GPIO_PORT, PWM1_GPIO_PINS, GPIO_MODE_OUT_PP_LOW_FAST);
  GPIO_Init(PWM2_GPIO_PORT, PWM2_GPIO_PINS, GPIO_MODE_OUT_PP_LOW_FAST);
  GPIO_Init(PWM3_GPIO_PORT, PWM3_GPIO_PINS, GPIO_MODE_OUT_PP_LOW_FAST);
  GPIO_Init(PWM4_GPIO_PORT, PWM4_GPIO_PINS, GPIO_MODE_OUT_PP_LOW_FAST);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1,ENABLE);
  TIM1_DeInit();
  TIM1_Cmd(DISABLE);
  TIM1_TimeBaseInit(TIM1_Prescaler0, TIM1_COUNTERMODE_UP, T1_MAXPWM-1, 0);//16M/200=80K

  /* Channel 1, 2,3 and 4 Configuration in PWM mode */

  /*
  TIM1_OCMode = TIM1_OCMODE_PWM2
  TIM1_OutputState = TIM1_OUTPUTSTATE_ENABLE
  TIM1_OutputNState = TIM1_OUTPUTNSTATE_DISABLE
  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_DISABLE,
               100, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
               TIM1_OCNIDLESTATE_RESET);

  TIM1_OC2Init(TIM1_OCMODE_PWM2, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE,
               100, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
               TIM1_OCNIDLESTATE_RESET);

  TIM1_OC3Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE,
               100, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_HIGH, TIM1_OCIDLESTATE_SET,
               TIM1_OCNIDLESTATE_RESET);

  TIM1_OC4Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE,
               180, TIM1_OCPOLARITY_LOW, TIM1_OCIDLESTATE_RESET);

  TIM1_OC1PreloadConfig(ENABLE);
  TIM1_OC2PreloadConfig(ENABLE);
  TIM1_OC3PreloadConfig(ENABLE);
  TIM1_OC4PreloadConfig(ENABLE);
  TIM1_CCxCmd(TIM1_CHANNEL_1, ENABLE);
  TIM1_CCxCmd(TIM1_CHANNEL_2, ENABLE);
  TIM1_CCxCmd(TIM1_CHANNEL_3, ENABLE);
  TIM1_CCxCmd(TIM1_CHANNEL_4, ENABLE);
  TIM1_CtrlPWMOutputs(ENABLE);
  TIM1_Cmd(ENABLE);
}

 

经过测试，STM8S003F3 的Timer1 四个PWM通道输出均正常了。看来，小小的MCU，还是需要深入研究并使用的。