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[mw_shl_code=c,true]void TIM4_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* TIM4 clock enable */
//PCLK1经过2倍频后作为TIM4的时钟源等于72MHz
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
NVIC_Configuration(1);
/* GPIOB clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE);
/*GPIOB Configuration: TIM4 channel 1 and 2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_6|GPIO_Pin_7);
}
void Tim2_Slave_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_DeInit(TIM2);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
NVIC_Configuration(8);
TIM_TimeBaseStructure.TIM_Period= XBUF[1] - 1;
TIM_TimeBaseStructure.TIM_Prescaler= 0; //时钟预分频数
TIM_TimeBaseStructure.TIM_ClockDivision=0; //采样分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上溢出
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
TIM_SelectInputTrigger(TIM2,TIM_TS_ITR3);//选择TIM2的输入触发源 内部触发3 TIM4
TIM_InternalClockConfig(TIM2);
TIM2->SMCR |= 0x0007;//设定从模式控制寄存器，外部时钟模式1 上升沿驱动计数
//TIM_UpdateDisableConfig(TIM4,ENABLE);
TIM_ARRPreloadConfig(TIM2, ENABLE);
TIM_ClearFlag(TIM2,TIM_FLAG_Update); //清除溢出中断标志
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM2,ENABLE);//是否开启时钟（开启后每发送一个脉冲，定时器加一）
}
void Tim3_Slave_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_DeInit(TIM3);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
NVIC_Configuration(9);
TIM_TimeBaseStructure.TIM_Period= XBUF[3] - 1;
TIM_TimeBaseStructure.TIM_Prescaler= 0; //时钟预分频数
TIM_TimeBaseStructure.TIM_ClockDivision=0; //采样分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上溢出
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
TIM_SelectInputTrigger(TIM3,TIM_TS_ITR3);//选择TIM2的输入触发源 内部触发3 TIM4
TIM_InternalClockConfig(TIM3);
TIM3->SMCR |= 0x0007;//设定从模式控制寄存器，外部时钟模式1 上升沿驱动计数
//TIM_UpdateDisableConfig(TIM4,ENABLE);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_ClearFlag(TIM3,TIM_FLAG_Update); //清除溢出中断标志
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM3,ENABLE);//是否开启时钟（开启后每发送一个脉冲，定时器加一）
}
/*
* 函数名：TIM4_Mode_Config
* 描述 ：配置TIM4输出的PWM信号的模式，如周期、极性、占空比
* 输入 ：无
* 输出 ：无
* 调用 ：内部调用
*/
void TIM4_PWM_Init(u16 T)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
u16 CCR1_Val = (T+1)/2;
u16 CCR2_Val = (T+1)/2;
u16 CCR3_Val = (T+1)/2;
u16 CCR4_Val = (T+1)/2;
/* -----------------------------------------------------------------------
TIM1 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM1CLK = 36 MHz, Prescaler = 0x0, TIM1 counter clock = 36 MHz
TIM1 ARR Register = 999 => TIM1 Frequency = TIM1 counter clock/(ARR + 1)
TIM1 Frequency = 36 KHz.
TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 50%
TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR)* 100 = 50%
TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR)* 100 = 50%
TIM1 Channel4 duty cycle = (TIM1_CCR4/ TIM1_ARR)* 100 = 50%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = T-1;//T us
TIM_TimeBaseStructure.TIM_Prescaler = 72-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM4->CR1 &= ((u16)0x03FD);// UDIS enable
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
TIM_OC2Init(TIM4, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
/*
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
TIM_OC3Init(TIM4, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
TIM_OC4Init(TIM4, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);*/
TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_SelectOutputTrigger(TIM4,TIM_TRGOSource_OC1Ref);
/* TIM1 enable counter */
TIM_Cmd(TIM4, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM4, ENABLE);
}
void TIM4_PWM_START(void)
{
TIM4_GPIO_Config();
Tim2_Slave_Init();
Tim3_Slave_Init();
TIM4_PWM_Init(XBUF[0]);
}[/mw_shl_code]
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( 粤ICP备12000418号-1 )
发表于 2014-12-16 16:12:35
发表于 2014-12-16 16:12:36
楼主
rivate functions ---------------------------------------------------------*/ 
