文章标题

stm32高级定时器PWM互补输出+死区插入使用详解

意法半导体开发的stm32系列单片机功能强大，其高级定时器TIM1和TIM8功能强大，配置较繁琐，本文介绍使用标准库进行配置的过程。

标准库例程

int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/

/* TIM1 Configuration */
TIM_Config();

/* ---------------------------------------------------------------------------
TIM1 Configuration to:

1/ Generate 3 complementary PWM signals with 3 different duty cycles:

TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2), since APB2
prescaler is different from 1.
TIM1CLK = 2 * PCLK2
PCLK2 = HCLK / 2
=> TIM1CLK = 2 * (HCLK / 2) = HCLK = SystemCoreClock

TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is equal to 0 so the
TIM1 counter clock used is SystemCoreClock (168MHz).

The objective is to generate PWM signal at 17.57 KHz:
- TIM1_Period = (SystemCoreClock / 17570) - 1

The Three Duty cycles are computed as the following description:

The channel 1 duty cycle is set to 50% so channel 1N is set to 50%.
The channel 2 duty cycle is set to 25% so channel 2N is set to 75%.
The channel 3 duty cycle is set to 12.5% so channel 3N is set to 87.5%.

The Timer pulse is calculated as follows:
- ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100

2/ Insert a dead time equal to (11/SystemCoreClock) ns

3/ Configure the break feature, active at High level, and using the automatic
output enable feature

4/ Use the Locking parameters level1.

Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */

/* Compute the value to be set in ARR register to generate signal frequency at 17.57 Khz */
TimerPeriod = (SystemCoreClock / 17570) - 1;

/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */
Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);

/* Compute CCR2 value to generate a duty cycle at 25%  for channel 2 */
Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);

/* Compute CCR3 value to generate a duty cycle at 12.5%  for channel 3 */
Channel3Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

/* Channel 1, 2 and 3 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

TIM_OC1Init(TIM1, &TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);

/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 11;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;

TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

/* TIM1 counter enable */
TIM_Cmd(TIM1, ENABLE);

/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);

while (1)
{
}
}

标准库对应寄存
92c2
器详解