使用不同版本的标准库导致了不同的现象，内部晶振最大64M所以分频是64'000'000/64 = 1'000'000;周期定为1000；则可以生成1kz的pwm，占空比0‰到1000‰
void TIM1_PWM(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/*开时钟PWM的 与GPIO的*/
RCC_APB2PeriphClockCmd (RCC_APB2Periph_TIM1,ENABLE);
RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOA, ENABLE);
/* PA8设置为功能脚（PWM） */
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_DeInit (TIM1);//重设为缺省值
/*TIM1时钟配置*/
TIM_TimeBaseStructure.TIM_Prescaler = 64;//预分频（时钟分频）64M/4000=18K
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
TIM_TimeBaseStructure.TIM_Period = 1000-1;//装载值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置了时钟分割
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;//周期计数器值
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);//初始化TIMx的时间基数单位
/* Channel 1 Configuration in PWM mode 通道一的PWM*/
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//正向通道PA8
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道PB13
TIM_OCInitStructure.TIM_Pulse = 500; //占空时间 1000 中有500的时间为高，互补的输出正好相反
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//空闲状态下的非工作状态
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* TIM1 counter enable开定时器 */
TIM_Cmd (TIM1, ENABLE);
/* TIM1 Main Output Enable 使能TIM1外设的主输出*/
TIM_CtrlPWMOutputs (TIM1, ENABLE);
}
使用uCOS的时候由于是修改官方uCOS例程文件，其使用的是2008年的 V2.0的库
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
这两句代码貌似必须要加上
而使用2011年的V3.5.0的库就不用加
TIM_SetCompare1(TIM1, 0);//使用这个修改占空比
做个记录
附带TIM3 PWM设置 TIM4和TIM3类似
/***************************************************************Author:Liming***
* @brief TIM3_GPIO_Config
* @param None
* @retval None
*****************************************************************0X49E7FC7B****/
static void TIM3_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟使能
//TIM3_CH1-TIM3_CH2的PWM的GPIO
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; //50MHZ
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟使能
//TIM3_CH3-TIM3_CH4的PWM的GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHZ
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
/***************************************************************Author:Liming***
* @brief TIM3_Mode_Config
* @param None
* @retval None
*****************************************************************0X49E7FC7B****/
static void TIM3_Mode_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信号电平跳变值 */
u16 CCR1_Val=0;
u16 CCR2_Val=0;
u16 CCR3_Val=0;
u16 CCR4_Val=0;
/* -----------------------------------------------------------------------
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM3CLK = 64 MHz, Prescaler = 0x0, TIM3 counter clock = 64 MHz
TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
TIM3 Frequency = 64 KHz.
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = TIM_PERIOD; //当定时器从0计数到999，即为1000次，为一个定时周期
TIM_TimeBaseStructure.TIM_Prescaler = 5; //设置预分频：不预分频，即为64MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ; //设置时钟分频系数：不分频
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_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);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //设置通道2的电平跳变值，输出另外一个占空比的PWM
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //使能通道2
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //设置通道3的电平跳变值，输出另外一个占空比的PWM
TIM_OC3Init(TIM3, &TIM_OCInitStructure); //使能通道3
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val; //设置通道4的电平跳变值，输出另外一个占空比的PWM
TIM_OC4Init(TIM3, &TIM_OCInitStructure); //使能通道4
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIM3重载寄存器ARR
/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE); //使能定时器3
}
修改占空比方式跟TIM1一样