本帖最后由 pilihuo81 于 2012-12-1 11:00 编辑
说明：
使用定时器TIM2 控制定时器TIM1 1kHz 精确控制输出脉冲个数
通过TIM1 输出占空比调整脉冲个数 本人控制是 1—9999个
//******************************************************************************
TIM_DeInit(TIM2); //时钟为：84MHz
/* TIM2 Base configuration */
TIM_TimeBaseStructure.TIM_Period=20000-1; //
TIM_TimeBaseStructure.TIM_Prescaler=42000-1;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//TIM_CKD_DIV1; //采样分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM2, DISABLE);//禁止ARR预装载缓冲器
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2; //
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//Disable;//Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse =20000-(welding_time*2);//0;//TimerPeriod/2;//0;//Channel1Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//High;//Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;//;//Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_OC1Ref); //选择触发输出为OC1
/* TIM Interrupts enable */
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//TIM_IT_CC1,ENABLE);
TIM_Cmd(TIM2, ENABLE); //开启时钟
/****TIM1 For PWM output *********************************/
TIM_DeInit(TIM1); //时钟为：168MHz
/* TIM1 Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 42-1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;
TIM_TimeBaseStructure.TIM_Period = 2000-1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Channel_1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = 20*(100-duty_cycle);
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//High;// Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_ForcedOC1Config(TIM1,TIM_ForcedAction_Active);
TIM_CCxCmd(TIM1,TIM_Channel_1,TIM_CCx_Disable);
/* Channel_2 Configuration in PWM mode */
//TIM_OCInitStructure.TIM_Pulse = 20*(duty_cycle);
//TIM_OC2Init(TIM1, &TIM_OCInitStructure);
/* Channel_3 Configuration in PWM mode */
TIM_OCInitStructure.TIM_Pulse = 20*(duty_cycle);
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//High;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_ForcedOC3Config(TIM1,TIM_ForcedAction_InActive);
TIM_CCxCmd(TIM1,TIM_Channel_3,TIM_CCx_Disable);
TIM1->CCMR1=0x60;
TIM1->CCMR2=0x60;
/TIM_CCxCmd(TIM1,TIM_Channel_1,TIM_CCx_Enable);
/TIM_CCxCmd(TIM1,TIM_Channel_3,TIM_CCx_Enable);
TIM_ITRxExternalClockConfig(TIM1, TIM_TS_ITR1);//外部时钟模式1，触发源为TIMER2
TIM_SelectSlaveMode(TIM1,TIM_SlaveMode_Gated);//配置为门控模式，时钟自动切换为内部时钟
/* TIM1 counter enable */
TIM_Cmd(TIM1, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, DISABLE);
//************************************************************************
//******************************************************************************
TIM_DeInit(TIM7); //时钟为：84MHz
/* TIM7 Time base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 82340;//42000;//82340;//42000-1;//82340;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period =5-1;;// 25-1;//2000-1;//5-1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter =0;
TIM_TimeBaseInit(TIM7, &TIM_TimeBaseStructure);
TIM_UpdateRequestConfig(TIM7,TIM_UpdateSource_Regular);
/* Clear TIM7 Updata_Interrupts Bit */
TIM_ClearITPendingBit(TIM7, TIM_IT_Update);
/* TIM7 Updata_Interrupts enable */
//TIM_ITConfig(TIM7,TIM_IT_Update, ENABLE);
TIM_ITConfig(TIM7,TIM_IT_Update, ENABLE);
/* TIM7 enable counter */
TIM_Cmd(TIM7, ENABLE);
使能控制
void EXTI0_IRQHandler(void)
{
TIM_Cmd(TIM7, ENABLE);
//tim7delay_ms(50);
///TIM_ITConfig(TIM7,TIM_IT_Update, ENABLE);
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
{
/* Clear the EXTI line 0 pending bit */
//TIM_Cmd(TIM7, ENABLE);
//EXTI_ClearITPendingBit(EXTI_Line0);
tim7delay_ms(30);
if(GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_0))
{
if(weld_Enable==1)
{
TIM1->CCMR1=0x60;
TIM1->CCMR2=0x60;
TIM1->CNT=20*(100-duty_cycle)-100;//100;//1800; 20*(100-duty_cycle)-100
TIM2->CNT=19999-(welding_time)*2;
//TIM_Cmd(TIM3, ENABLE); //开启时钟
//TIM_Cmd(TIM2, ENABLE); //开启时钟
TIM_CCxCmd(TIM1,TIM_Channel_1,TIM_CCx_Enable);
TIM_CCxCmd(TIM1,TIM_Channel_3,TIM_CCx_Enable);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_CCxCmd(TIM2,TIM_Channel_1,TIM_CCx_Enable);
//TIM_ITConfig(TIM7,TIM_IT_Update, ENABLE);
TIM_Cmd(TIM7, ENABLE);
if(welding_time==9999)
{
welding_time7=welding_time-2;
}
else if(welding_time<9999)
{
welding_time7=welding_time;
}
tim7delay_ms(welding_time7);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
weld_Enable=0;
if(flag1==0)
{
GPIO_SetBits(GPIOD, GPIO_Pin_12);
GPIO_ResetBits(GPIOD, GPIO_Pin_13);
}
else
{
GPIO_ResetBits(GPIOD, GPIO_Pin_12);
GPIO_SetBits(GPIOD, GPIO_Pin_13);
}
if(flag1==0)
{
flag1=1;
}
else if(flag1==1)
{
flag1=0;
}
}
}
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
结束控制
void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ITConfig(TIM2,TIM_IT_Update,DISABLE);
/* Main Output Disable */
TIM_CtrlPWMOutputs(TIM1, DISABLE);
TIM_ForcedOC1Config(TIM1,TIM_ForcedAction_Active);
TIM_ForcedOC3Config(TIM1,TIM_ForcedAction_InActive);
TIM_CCxCmd(TIM1,TIM_Channel_1,TIM_CCx_Disable);
TIM_CCxCmd(TIM1,TIM_Channel_3,TIM_CCx_Disable);
TIM_CCxCmd(TIM2,TIM_Channel_1,TIM_CCx_Disable);
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
weld_Enable=1;
}
}