CH32V208_TIM_PWM

前言：

提供以下PWM波形

PA8:TIM1_CH1;

PA15:TIM2_CH1_1;

PA7:TIM3_CH2;

代码：

/* PWM Output Mode Definition */
#define PWM_MODE1   0
#define PWM_MODE2   1

/* PWM Output Mode Selection */
//#define PWM_MODE PWM_MODE1
#define PWM_MODE PWM_MODE2

/*********************************************************************
 * @fn      TIM1_OutCompare_Init
 *
 * @brief   Initializes TIM1 output compare.
 *
 * @param   arr - the period value.
 *          psc - the prescaler value.
 *          ccp - the pulse value.
 *
 * @return  none
 */
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_TIM1, ENABLE );

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
	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( TIM1, &TIM_TimeBaseInitStructure);

#if (PWM_MODE == PWM_MODE1)
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

#elif (PWM_MODE == PWM_MODE2)
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

#endif

	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = ccp;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OC1Init( TIM1, &TIM_OCInitStructure );

	TIM_CtrlPWMOutputs(TIM1, ENABLE );
	TIM_OC1PreloadConfig( TIM1, TIM_OCPreload_Disable );
	TIM_ARRPreloadConfig( TIM1, ENABLE );
	TIM_Cmd( TIM1, ENABLE );
}

void TIM2_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_AFIO, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
	GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2,ENABLE);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
	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( TIM2, &TIM_TimeBaseInitStructure);

#if (PWM_MODE == PWM_MODE1)
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

#elif (PWM_MODE == PWM_MODE2)
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

#endif

	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = ccp;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OC1Init( TIM2, &TIM_OCInitStructure );

	TIM_CtrlPWMOutputs(TIM2, ENABLE );
	TIM_OC1PreloadConfig( TIM2, TIM_OCPreload_Disable );
	TIM_ARRPreloadConfig( TIM2, ENABLE );
	TIM_Cmd( TIM2, ENABLE );
}

void TIM3_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_AFIO, ENABLE );
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
	// GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2,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( TIM3, &TIM_TimeBaseInitStructure);

#if (PWM_MODE == PWM_MODE1)
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

#elif (PWM_MODE == PWM_MODE2)
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

#endif

	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = ccp;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OC2Init( TIM3, &TIM_OCInitStructure );

	TIM_CtrlPWMOutputs(TIM3, ENABLE );
	TIM_OC2PreloadConfig( TIM3, TIM_OCPreload_Disable );
	TIM_ARRPreloadConfig( TIM3, ENABLE );
	TIM_Cmd( TIM3, ENABLE );
}

int main(void)
{
	SystemCoreClockUpdate();
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);
	printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

	TIM1_PWMOut_Init( 200, 48000-1, 100 );	//PA8:TIM1_CH1;
	// TIM2_PWMOut_Init( 100, 48000-1, 50 );	//PA15:TIM2_CH1_1;
	TIM3_PWMOut_Init( 100, 48000-1, 50 );	//PA7:TIM3_CH2;

	while(1);
}

 注意：

可以PA8/PA7同时产生PWM波形。无法同时与PA15产生。因为PA15是映射引脚。

如果用到映射的引脚，则只能使用对应的映射组。

即可以同时使用TIM1/TIM2等其他非映射引脚，或者使用TIM1_1/TIM2_1/TIM3_1等其他_1引脚，或者使用TIM1_2/TIM2_2/TIM3_2...