STM32 Timer PWM_Output

庫函數(shù) STM32F10x_StdPeriph_Lib_V3.3.0ProjectSTM32F10x_StdPeriph_ExamplesTIMPWM_Output

主要程序如下：

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)定時器功能包括：

● 16位向上、向下、向上/向下自動裝載計數(shù)器

● 16位可編程(可以實時修改)預(yù)分頻器，計數(shù)器時鐘頻率的分頻系數(shù)為1～65536之間的任意數(shù)值

● 4個獨立通道： ─ 輸入捕獲 ─ 輸出比較 ─ PWM生成(邊緣或中間對齊模式) ─ 單脈沖模式輸出

● 使用外部信號控制定時器和定時器互連的同步電路

● 如下事件發(fā)生時產(chǎn)生中斷/DMA： ─ 更新：計數(shù)器向上溢出/向下溢出，計數(shù)器初始化(通過軟件或者內(nèi)部/外部觸發(fā)) ─ 觸發(fā)事件(計數(shù)器啟動、停止、初始化或者由內(nèi)部/外部觸發(fā)計數(shù)) ─ 輸入捕獲 ─ 輸出比較

● 支持針對定位的增量(正交)編碼器和霍爾傳感器電路

● 觸發(fā)輸入作為外部時鐘或者按周期的電流管理