Triggers stm32f405产生触发信号pwm
我试图用三个定时器产生一个相移PWM信号Triggers stm32f405产生触发信号pwm,triggers,embedded,pwm,stm32f4discovery,Triggers,Embedded,Pwm,Stm32f4discovery,我试图用三个定时器产生一个相移PWM信号 TIM1用作参考(在1MHz下运行) TIM3用作相移TIM4的触发器 TIM4用于产生由TIM3触发的相移信号 综上所述:TIM1---触发器-->TIM3---触发器-->TIM4 信号应如下所示: Reference: TIM1 (1 MHz) ___ ___ ___ ___ ___| |___| |___| |___| |___| TIM
- TIM1用作参考(在1MHz下运行)
- TIM3用作相移TIM4的触发器
- TIM4用于产生由TIM3触发的相移信号
Reference: TIM1 (1 MHz)
___ ___ ___ ___
___| |___| |___| |___| |___|
TIM Count 0 84 168
Update Event ^ ^ ^ ^ ^
Trigger signal: TIM 3 triggered by TIM1 ((SINGLE PULSE MODE!!) 1MHz
/| /| /| /| /|
/ | / | / | / | / |
TIM Count 0 20
Update Event ^ ^ ^ ^ ^
Phase shift signal TIM4 (1MHZ) same duty cycle as TIM1 triggered by TIM3
___ ___ ___ ___ ___
___| |___| |___| |___| |___| |_
这是我目前的代码。参考信号在1MHz下正常运行。但是触发信号现在不起作用。错误应该在initReferenceTimer()或initReferencePWM()函数中的任何位置。到目前为止,它还不能像上面提到的那样产生触发信号。因此,我无法测试相移信号是否正确触发
有人对此有好主意吗
为了进行调试,我还将触发信号绑定到输出引脚
#define TIMER_CLOCK 84
#define TIM1_TIMER_CLOCK 168
#define FREQU 1 //MHz
#define SHIFT 20
#define MasterPeriod (TIM1_TIMER_CLOCK/FREQU)-1
#define MasterPulse ((TIM1_TIMER_CLOCK/FREQU)-1)/2
#define ReferencePeriod SHIFT
#define ReferencePulse (SHIFT/2)
#define SlavePeriod (TIM1_TIMER_CLOCK/FREQU)-1
#define SlavePulse ((TIM1_TIMER_CLOCK/FREQU)-1)/2
//TIM1 Channel1: PA7 N
void initMasterPin()
{
GPIO_InitTypeDef GPIO_InitStructureTimer;
// Port clock enable
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Set PWM Port, Pin and method
GPIO_InitStructureTimer.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructureTimer.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructureTimer.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructureTimer.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructureTimer.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOA, &GPIO_InitStructureTimer);
// Connect TIM pin to AF
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_TIM1);
}
//TIM3 Channel1 PC6
void initReferencePin()
{
GPIO_InitTypeDef GPIO_InitStructureTimer;
// Port clock enable
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
// Set PWM Port, Pin and method
GPIO_InitStructureTimer.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructureTimer.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructureTimer.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructureTimer.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructureTimer.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOC, &GPIO_InitStructureTimer);
// Connect TIM pin to AF
GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM3);
}
//TIM4 Channel1: PB6
void initSlavePin()
{
GPIO_InitTypeDef GPIO_InitStructureTimer;
// Port clock enable
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// Set PWM Port, Pin and method
GPIO_InitStructureTimer.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructureTimer.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructureTimer.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructureTimer.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructureTimer.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructureTimer);
// Connect TIM pin to AF
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
}
//Tim1 Channel1: PA7
void initMasterTimer()
{
// set timer frequencies
TIM_TimeBaseInitTypeDef TIM_Config;
// 1.Enable TIM clock
RCC_APB2PeriphClockCmd (RCC_APB2Periph_TIM1, ENABLE);
// 2.Fill the TIM_TimeBaseInitStruct with the desired parameters.
// Time Base configuration
TIM_TimeBaseStructInit (&TIM_Config);
TIM_Config.TIM_Period = MasterPeriod;
TIM_Config.TIM_Prescaler = 0;
TIM_Config.TIM_CounterMode = TIM_CounterMode_Up;
TIM_Config.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_Config.TIM_RepetitionCounter = 0;
//configure the Time Base unit with the corresponding configuration
TIM_TimeBaseInit (TIM1, &TIM_Config);
// Enable the NVIC if you need to generate the update interrupt.
// Enable the corresponding interrupt
}
//TIM3 Channel1 PC6
void initReferenceTimer()
{
// set timer frequencies
TIM_TimeBaseInitTypeDef TIM_Config;
// 1.Enable TIM clock
RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM3, ENABLE);
// 2.Fill the TIM_TimeBaseInitStruct with the desired parameters.
// Time Base configuration
TIM_TimeBaseStructInit (&TIM_Config);
TIM_Config.TIM_Period = ReferencePeriod;//One Step Phase Shift
TIM_Config.TIM_Prescaler = 0;
TIM_Config.TIM_CounterMode = TIM_CounterMode_Up;
TIM_Config.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_Config.TIM_RepetitionCounter = 0;
//configure the Time Base unit with the corresponding configuration
TIM_TimeBaseInit (TIM3, &TIM_Config);
// Enable the NVIC if you need to generate the update interrupt.
// Enable the corresponding interrupt
}
//TIM4 Channel1: PB6
void initSlaveTimer()
{
// set timer frequencies
TIM_TimeBaseInitTypeDef TIM_Config;
// 1.Enable TIM clock
RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM4, ENABLE);
// 2.Fill the TIM_TimeBaseInitStruct with the desired parameters.
// Time Base configuration
TIM_TimeBaseStructInit (&TIM_Config);
TIM_Config.TIM_Period = SlavePeriod;
TIM_Config.TIM_Prescaler = 0;
TIM_Config.TIM_CounterMode = TIM_CounterMode_Up;
TIM_Config.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_Config.TIM_RepetitionCounter = 0;
//configure the Time Base unit with the corresponding configuration
TIM_TimeBaseInit (TIM4, &TIM_Config);
// Enable the NVIC if you need to generate the update interrupt.
// Enable the corresponding interrupt
}
//Tim1 Channel1: PA7
void initMasterPWM(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = MasterPulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
}
//TIM3 Channel1 PC6
void initReferencePWM(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = ReferencePulse; // set the duty cycle / pulse here!
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_SelectOnePulseMode(TIM3, TIM_OPMode_Single);
/* Slave Mode selection: TIM3 */
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0);
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
/* Select the Master Slave Mode */
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
}
//TIM4 Channel1: PB6
void initSlavePWM(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = SlavePulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2);
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Single);
}
int main(void)
{
initMasterPin();
initReferencePin(); //FOR DEBUGGING ONLY
initSlavePin();
initMasterTimer();
initReferenceTimer();
initSlaveTimer();
initMasterPWM();
initReferencePWM();
initSlavePWM();
// enable timer / counter
TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM4, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);
TIM_CtrlPWMOutputs(TIM4, ENABLE);
/* Busy loop */
int i;
while (1)
{
i++;
}
}
这是一般用途的建议-我对您的特定处理器没有经验 很难看到计时器,因此从底部开始:
- 降低所有定时器的速度-将预分频器选项调至最大值
- 确保您的ref clk计时器正在计数-使用调试器或printf显示计数器寄存器正朝您期望的方向运行
- 检查它是否复位
- 对其他计时器重复此操作(独立-无触发器)
- 现在设置第一个触发
- 验证触发是否在预期的时间启动所需的计时器-再次是printf或debugger
- 将其连接到链中的下一个计时器并重复
一旦它们都互相触发,你就可以开始收起频率,看看它们是否都能快速工作。你确定你的initReferencePWM中没有输入错误吗
void initReferencePWM(void)
{
...
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
...
}
为什么会突然出现TIM2?这种问题会让人非常沮丧。一般来说,你所能做的就是一遍又一遍地检查定时器和GPIO的电源、时钟和配置,直到你发现隐藏的、但却让它无法工作的微不足道的错误。您还可以查看是否存在验证部分功能的简单案例,或者是否存在涉及相同问题的示例。将代码移动到不同编号的计时器时要小心,因为它可能需要更改APB总线或GPIO备用函数ID。当然,要确保使用UART输出日志记录或调试器或状态指示灯,您的代码正在完全执行,而不是在断言失败后进入无限循环。