[参考译文] TMS320F28379D：根据 GPIO 输入设置 PWM 跳闸事件

Hi AK、

是的、您可以将同一 GPIO 用作跳闸信号。

您可以使用 ePWM 的数字比较子模块来反转跳闸信号的极性、以及许多其他功能、例如滤波或比较多个跳闸信号。 我建议阅读 ePWM 一章的数字比较子模块部分、并使用 SysConfig 进行配置。

谢谢！

Luke

Unknown 说：

是的、您可以将同一 GPIO 用作跳闸信号。

感谢您的确认。

[报价 userid="529193" URL"~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1395576/tms320f28379d-setting-up-pwm-trip-event-from-gpio-input/5342676 #5342676"]您可以使用 ePWM 的数字比较子模块来反转跳闸信号的极性、以及许多其他功能(例如滤波或比较多个跳闸信号)。 我建议阅读 ePWM 一章的数字比较子模块部分并使用 SysConfig 进行配置。[/QUOT]

我通读数字比较模块。 有没有任何示例展示所请求的功能？

我尝试了以下方法、成功更改了极性、并在 LaunchPad 上对其进行了测试

请您确认这是否是一种可以接受的方法：

令人惊讶的是、它与 ePWM 模块完全无关。

通读 TRM 手册的第15.9.2章、它指出 TZN 是 低电平有效输入信号。

对于低电平有效配置[1 (High)至 0 (Low)]、我们将 GPIO 配置为输入

示例：

GPIO_setMasterCore(42, GPIO_CORE_CPU1);
GPIO_setPinConfig(GPIO_42_GPIO42);
GPIO_setDirectionMode(42, GPIO_DIR_MODE_IN);
GPIO_setPadConfig(42, GPIO_PIN_TYPE_PULLUP);

对于高电平有效配置[0 (低电平 )至1 (高电平)]、 我们配置 GPIO 和"反相"输入：

示例：

GPIO_setMasterCore(42, GPIO_CORE_CPU1);
GPIO_setPinConfig(GPIO_42_GPIO42);
GPIO_setDirectionMode(42, GPIO_DIR_MODE_IN);
GPIO_setPadConfig(42, GPIO_PIN_TYPE_INVERT);

Hi AK、

我明天将回到这个问题上。

谢谢！

Luke

感谢您的确认。

我还有一个澄清：

是否可以动态更改跳闸操作？

或者我们是否应该每次都执行以下步骤：

"禁用 PWM 时钟、-->设置行程操作-->启用 PWM 时钟。"

我正在尝试实现类似这样的 somthing：

//All pwms are already congifured as complementary during initialization. 

if(state == brake)

{
	//Make 1A as low and 1B as High and force pwm trip.
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_HIGH);

	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_HIGH);

	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_HIGH);

	//force pwm trip
	EPWM_forceTripZoneEvent(EPWM1_BASE, EPWM_TZ_FORCE_EVENT_OST);
	EPWM_forceTripZoneEvent(EPWM2_BASE, EPWM_TZ_FORCE_EVENT_OST);
	EPWM_forceTripZoneEvent(EPWM3_BASE, EPWM_TZ_FORCE_EVENT_OST);
}
else if(state == stop)
{
	//Set the pwm trip back to its origenal conditions, incase a fault does occur from the gpio
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);

	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);

	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);

	//clear the trip flags which would have been set in the brake condition
	EPWM_clearTripZoneFlag(EPWM1_BASE,EPWM_TZ_FLAG_OST);
	EPWM_clearTripZoneFlag(EPWM1_BASE,EPWM_TZ_FLAG_OST);
	EPWM_clearTripZoneFlag(EPWM1_BASE,EPWM_TZ_FLAG_OST);
	
	//The pwms should now go back to being complementary
}
else if(state == run)

{
	//DO nothin, make sure the trip actions are set so that to low, so that when ever the GPIO catches a fault, the pwms will go low.
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM1_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);

	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM2_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);

	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
	EPWM_setTripZoneAction(EPWM3_BASE, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);
}