各位想做个四路PWM频率可调的发生器，可是发现只有TIM3能有PWM 输出。其余三路没有，请高手看看我的使能代码哪里有问题，好长时间不搞了，忘了。
void TIM_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* 设置TIMCLK 为 72MHZ */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 | RCC_APB1Periph_TIM4, ENABLE);
/* GPIOA and GPIOB clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD, ENABLE);
/*GPIOA Configuration: TIM2、TIM3、TIN1 channel 1 alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_6 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/*GPIOB Configuration: TIM4 channel 1 alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void TIM1_Mode_Config(int freq1)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
u16 CCR1_Val = 40;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = freq1; //当定时器从0计数到一个定时周期 ,此数值即是TIM1_ARR的值。
//This parameter must be a number between 0x0000 and 0xFFFF.
TIM_TimeBaseStructure.TIM_Prescaler = 1000; //设置预分频：1000，即为72MHz/1000=72000 This parameter can be a number between 0x0000 and 0xFFFF
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV2;//TIM_CKD_DIV2 ; //设置时钟分频系数：2分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE); // 使能TIM1重载寄存器ARR
/* TIM enable counter */
TIM_Cmd(TIM1, ENABLE); //使能定时器1
}
void TIM2_Mode_Config(int freq2)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
u16 CCR1_Val = 40;
/* -----------------------------------------------------------------------
TIM2 Channel1 duty cycle = (TIM2_CCR1/ TIM2_ARR+1)* 100% = 50%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = freq2; //当定时器从0计数到一个定时周期 ,此数值即是TIM2_ARR的值。
//This parameter must be a number between 0x0000 and 0xFFFF.
TIM_TimeBaseStructure.TIM_Prescaler = 1000; //设置预分频：1000，即为72MHz/1000=72000 This parameter can be a number between 0x0000 and 0xFFFF
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV2;//TIM_CKD_DIV2 ; //设置时钟分频系数：2分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平
TIM_OC1Init(TIM2, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM2, ENABLE); // 使能TIM2重载寄存器ARR
/* TIM enable counter */
TIM_Cmd(TIM2, ENABLE); //使能定时器2
}
void TIM3_Mode_Config(int freq3)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
u16 CCR1_Val = 4;
/* -----------------------------------------------------------------------
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR+1)* 100% = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR+1)* 100% = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR+1)* 100% = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR+1)* 100% = 12.5%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = freq3; //当定时器从0计数到一个定时周期 ,此数值即是TIM3_ARR的值。
//This parameter must be a number between 0x0000 and 0xFFFF.
TIM_TimeBaseStructure.TIM_Prescaler = 1000; //设置预分频：1000，即为72MHz/1000=72000 This parameter can be a number between 0x0000 and 0xFFFF
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV2;//TIM_CKD_DIV2 ; //设置时钟分频系数：2分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平
TIM_OC1Init(TIM3, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIM3重载寄存器ARR
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE); //使能定时器3
}
void TIM4_Mode_Config(int freq4)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
u16 CCR1_Val = 4;
/* -----------------------------------------------------------------------
TIM4 Channel1 duty cycle = (TIM4_CCR1/ TIM4_ARR+1)* 100% = 50%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = freq4; //当定时器从0计数到一个定时周期 ,此数值即是TIM4_ARR的值。
//This parameter must be a number between 0x0000 and 0xFFFF.
TIM_TimeBaseStructure.TIM_Prescaler = 1000; //设置预分频：1000，即为72MHz/1000=72000 This parameter can be a number between 0x0000 and 0xFFFF
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV2;//TIM_CKD_DIV2 ; //设置时钟分频系数：2分频
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;//TIM_OCMode_PWM1; //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平
TIM_OC1Init(TIM4, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM4, ENABLE); // 使能TIM4重载寄存器ARR
/* TIM enable counter */
TIM_Cmd(TIM4, ENABLE); //使能定时器4
}
