STM32

等#xff09;不同#xff0c;通用定时器通常没有直接的互补输出…可这里可以参考stm32的代码看看

PWM

等不同通用定时器通常没有直接的互补输出功能。

因此我们需要以下两种方法来实现

PWM

模式。

将一个通道的输出极性配置为正常高电平有效另一个通道的输出极性配置为反相低电平有效。

两个通道设置相同的占空比和频率但由于极性反转它们将输出互为反相的

PWM

启用时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,

ENABLE);

时钟RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,

ENABLE);

GPIO_InitStruct;GPIO_InitStruct.GPIO_Pin

GPIO_Pin_6

(TIM3_CH2)GPIO_InitStruct.GPIO_Mode

GPIO_Mode_AF;GPIO_InitStruct.GPIO_Speed

GPIO_Speed_100MHz;GPIO_InitStruct.GPIO_OType

GPIO_OType_PP;GPIO_InitStruct.GPIO_PuPd

GPIO_PuPd_NOPULL;GPIO_Init(GPIOA,

GPIO_InitStruct);//

TIM3_CH1GPIO_PinAFConfig(GPIOA,

GPIO_PinSource7,

TIM_TimeBaseStruct;TIM_TimeBaseStruct.TIM_Period

1000

周期TIM_TimeBaseStruct.TIM_Prescaler

预分频器假设系统时钟为

84MHzTIM_TimeBaseStruct.TIM_ClockDivision

TIM_CKD_DIV1;TIM_TimeBaseStruct.TIM_CounterMode

TIM_CounterMode_Up;TIM_TimeBaseInit(TIM3,

PWM

TIM_OCInitStruct;TIM_OCInitStruct.TIM_OCMode

TIM_OCMode_PWM1;

1TIM_OCInitStruct.TIM_OutputState

TIM_OutputState_Enable;TIM_OCInitStruct.TIM_Pulse

500;

50%TIM_OCInitStruct.TIM_OCPolarity

TIM_OCPolarity_High;

1反相输出TIM_OCInitStruct.TIM_OCPolarity

TIM_OCPolarity_Low;

配置为低电平有效。

两个通道的占空比和频率相同但极性反转形成互为反相的波形。

2软件模拟反相输出

pwm.h/********************************************************************************

TIM3中断服务函数******************************************************************************/

void

CH0/1/2通道B比较值0x3000Tim3_M23_EnPWM_Output(TRUE,

FALSE);

Tim3_GetIntFlag(Tim3UevIrq)){if(0

i){

Gpio_WriteOutputIO(STK_LED_PORT,

STK_LED_PIN,TRUE);

Gpio_WriteOutputIO(STK_LED_PORT,

STK_LED_PIN,FALSE);

0;}Tim3_ClearIntFlag(Tim3UevIrq);

//清中断标志}

enFlashWait;stc_sysctrl_pll_cfg_t

stcPLLCfg;//结构体初始化清零DDL_ZERO_STRUCT(stcPLLCfg);enFlashWait

FlashWaitCycle1;

//读等待周期设置为1当HCLK大于24MHz时必须至少为1Flash_WaitCycle(enFlashWait);

Flash

48MHzSysctrl_SetPLLFreq(stcPLLCfg);Sysctrl_SetPLLStableTime(SysctrlPllStableCycle16384);Sysctrl_ClkSourceEnable(SysctrlClkPLL,

TRUE);Sysctrl_SysClkSwitch(SysctrlClkPLL);///

时钟切换

stcLEDPort;//结构体初始化清零DDL_ZERO_STRUCT(stcTIM3Port);

DDL_ZERO_STRUCT(stcLEDPort);Sysctrl_SetPeripheralGate(SysctrlPeripheralGpio,

TRUE);

//PD14设置为LED输出stcTIM3Port.enDir

GpioDirOut;//

Gpio_SetAfMode(GpioPortA,GpioPin8,GpioAf2);

//PA08设置为TIM3_CH0A

Gpio_SetAfMode(GpioPortA,GpioPin7,GpioAf4);

//PA07设置为TIM3_CH0B

stcTIM3Port);Gpio_SetAfMode(GpioPortB,GpioPin10,GpioAf5);

//PB10设置为TIM3_CH1AGpio_Init(GpioPortB,

GpioPin0,

stcTIM3Port);Gpio_SetAfMode(GpioPortB,GpioPin0,GpioAf2);

//PB00设置为TIM3_CH1B//

Gpio_SetAfMode(GpioPortB,GpioPin8,GpioAf6);

//PB08设置为TIM3_CH2A

Gpio_SetAfMode(GpioPortB,GpioPin15,GpioAf2);

//PB15设置为TIM3_CH2B

u8ValidPeriod;stc_tim3_mode23_cfg_t

stcTim3BaseCfg;stc_tim3_m23_compare_cfg_t

stcTim3PortCmpCfg;//结构体初始化清零DDL_ZERO_STRUCT(stcTim3BaseCfg);DDL_ZERO_STRUCT(stcTim3PortCmpCfg);Sysctrl_SetPeripheralGate(SysctrlPeripheralTim3,

TRUE);

//Timer3外设时钟使能stcTim3BaseCfg.enWorkMode

Tim3WorkMode3;

//定时器功能计数时钟为内部PCLKstcTim3BaseCfg.enPRS

Tim3PCLKDiv1;

//向上计数在三角波模式时只读stcTim3BaseCfg.enPWMTypeSel

Tim3IndependentPWM;

//Tim3ComplementaryPWM;stcTim3BaseCfg.enPWM2sSel

Tim3SinglePointCmp;

//单点比较功能stcTim3BaseCfg.bOneShot

FALSE;

//上下溢更新Tim3_Mode23_Init(stcTim3BaseCfg);

//TIM3

的模式0功能初始化Tim3_M23_ARRSet(u16Period,

TRUE);

//设置CH1比较值ATim3_M23_CCR_Set(Tim3CCR1B,

u16CHxBCompare);

//设置CH2比较值BstcTim3PortCmpCfg.enCHxACmpCtrl

Tim3PWMMode2;

//OCREFA输出控制OCMA:PWM模式2stcTim3PortCmpCfg.enCHxAPolarity

Tim3PortPositive;

//正常输出stcTim3PortCmpCfg.bCHxACmpBufEn

TRUE;

//A通道缓存控制stcTim3PortCmpCfg.enCHxACmpIntSel

Tim3CmpIntNone;

//A通道比较中断控制:无stcTim3PortCmpCfg.enCHxBCmpCtrl

Tim3PWMMode2;

//OCREFB输出控制OCMB:PWM模式2(PWM互补模式下也要设置避免强制输出)stcTim3PortCmpCfg.enCHxBPolarity

Tim3PortOpposite;

//反相输出stcTim3PortCmpCfg.bCHxBCmpBufEn

TRUE;

//B通道缓存控制使能stcTim3PortCmpCfg.enCHxBCmpIntSel

Tim3CmpIntNone;

Tim3_M23_PortOutput_Cfg(Tim3CH0,

stcTim3PortCmpCfg);

//比较输出端口配置Tim3_M23_PortOutput_Cfg(Tim3CH1,

stcTim3PortCmpCfg);

Tim3_M23_PortOutput_Cfg(Tim3CH2,

stcTim3PortCmpCfg);

//事件更新周期设置0表示三角波每半个周期更新一次每1代表延迟半个周期Tim3_M23_SetValidPeriod(u8ValidPeriod);

//间隔周期设置u16CntValue

0;Tim3_M23_Cnt16Set(u16CntValue);

//设置计数初值Tim3_ClearAllIntFlag();

//清中断标志Tim3_Mode23_EnableIrq(Tim3UevIrq);

//使能TIM3