STM32 Timer PWM_Output

脉冲宽度调制形式能够发生一个由TIMx_ARR寄存器确认频率、由TIMx_CCRx寄存器确认占空比的信号。
下面是一个PWM形式1的比如。当TIMx_CNT

库函数 STM32F10x_StdPeriph_Lib_V3.3.0\Project\STM32F10x_StdPeriph_Examples\TIM\PWM_Output

首要程序如下：

uint16_t CCR1_Val = 333; // 333/666=0.5 占空比
uint16_t CCR2_Val = 249; // 249/666=0.374
uint16_t CCR3_Val = 166; // 166/666=0.25
uint16_t CCR4_Val = 83; // 83/666 =0.125
uint16_t PrescalerValue = 0;

/* Private function prototypes ———————————————–*/
void RCC_Configuration(void);
void GPIO_Configuration(void);

/* Private functions ———————————————————*/

/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*! this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/

/* System Clocks Configuration */
RCC_Configuration();

/* GPIO Configuration */
GPIO_Configuration();

/* ———————————————————————–
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
The TIM3CLK frequency is set to SystemCoreClock (Hz), to get TIM3 counter
clock at 24 MHz the Prescaler is computed as following:
– Prescaler = (TIM3CLK / TIM3 counter clock) – 1
SystemCoreClock is set to 72 MHzfor Low-density, Medium-density, High-density
and Connectivity line devices and to 24 MHz for Low-Density Value line and
Medium-Density Value line devices

The TIM3 is running at 36 KHz: TIM3 Frequency = TIM3 counter clock/(ARR + 1)
= 24 MHz / 666 = 36 KHz 36036HZ
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%
———————————————————————– */
/* Compute the prescaler value */
PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) – 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 665;//Autoreload value ARR
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;/* Set the Capture Compare Register value CCR1 */
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC1Init(TIM3, &TIM_OCInitStructure);
// Enables or disables the TIMx peripheral Preload register on CCR1.
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

TIM_OC2Init(TIM3, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

TIM_OC3Init(TIM3, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

TIM_OC4Init(TIM3, &TIM_OCInitStructure);

TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3, ENABLE);

/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);

while (1)
{}
}

通用TIMx (TIM2、TIM3、TIM4和TIM5)定时器功用包含：

● 16位向上、向下、向上/向下主动装载计数器

● 16位可编程(能够实时修正)预分频器，计数器时钟频率的分频系数为1～65536之间的恣意数值

● 4个独立通道： ─ 输入捕获 ─ 输出比较 ─ PWM生成(边际或中心对齐形式) ─ 单脉冲形式输出

● 运用外部信号操控定时器和定时器互连的同步电路

● 如下事情发生时发生中止/DMA： ─ 更新：计数器向上溢出/向下溢出，计数器初始化(经过软件或许内部/外部触发) ─ 触发事情(计数器发动、中止、初始化或许由内部/外部触发计数) ─ 输入捕获 ─ 输出比较

● 支撑针对定位的增量(正交)编码器和霍尔传感器电路

● 触发输入作为外部时钟或许按周期的电流办理