|
本帖最后由 你好我好大家好！ 于 2015-1-28 19:44 编辑 有高手调试过st库函数中自带的TIM_6Steps历程吗？stm32f051xx的。我调试了一下，出来的波形是下图这样的file:///C:\Users\Administrator\Documents\Tencent Files\1835116269\Image\4~}7E)9FBC$1E]F6CKEYB(H.jpg，感觉有些问题就是1和1n通道有同时为高电平的时候，这样在电机控制板中上下桥臂的两只管子就会直通，就把电源烧坏了。我希望是在1和1n通道没有输出pwm的期间，对应管脚输出都为低电平。可能是哪里没有设置好，希望高手们可以只指点一下， |
微信公众号
手机版
您好啊：
我采用的是nnmos的驱动模式。现在希望的是：在各通道上同时为Disable期间，对应通道的引脚为低电平，比如上图中1和1n通道中划红线的部分，是两个通道同时为Disable，希望这里同时为低电平。
定时器的配置是这样的， /* Channel 1, 2,3 and 4 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 2047;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High ;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set ;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set ;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 1023;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 511;
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_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 1;
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);
在中断中六步pwm是这样的，void TIM1_BRK_UP_TRG_COM_IRQHandler(void)
{
/* Clear TIM1 COM pending bit */
TIM_ClearITPendingBit(TIM1, TIM_IT_COM);
if (step == 1)
{
/* Next step: Step 2 Configuration -------------------------------------- */
/* Channel3 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1 );
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Enable);
step++;
}
else if (step == 2)
{
/* Next step: Step 3 Configuration -------------------------------------- */
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Enable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
step++;
}
else if (step == 3)
{
/* Next step: Step 4 Configuration -------------------------------------- */
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Enable);
step++;
}
else if (step == 4)
{
/* Next step: Step 5 Configuration -------------------------------------- */
/* Channel3 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Enable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
step++;
}
else if (step == 5)
{
/* Next step: Step 6 Configuration -------------------------------------- */
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Enable);
/* Channel1 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
step++;
}
else
{
/* Next step: Step 1 Configuration -------------------------------------- */
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Enable);
/* Channel2 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
step = 1;
}
}
按道理说在两个通道同时Disable期间，对应引脚输出的电平就是为低电平啊，因为定时器的配置为TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High ;
可是用逻辑分析仪测试的结果不是这样的，希望能指点一下，先谢谢了
你那个波形是怎么来的呀，我用的没问题，不过我是用在Full bright上，没一点问题呀。应该是你文档研究的不够深入，我没用库文件，自己写的。ST的这个PWM真心不好用，文档看起来要吐血，写的不明不白的。
能把你用逻辑分析仪检测的波形贴出来吗？不然不好分析。另，关于官网自带的程序的库还有讨论的空间：官网的程序基于051，内核是cotex—m0的好像，103系列的是基于cotex_m3,对于库的版本对于pwm输出极性的影响，参照下图，希望对你有帮助。