TMS320F280049C: 程序中ADC采样读取耗时与PWM写入耗时

X W

Part Number: TMS320F280049C
Other Parts Discussed in Thread: C2000WARE

样例程序为C2000Ware_DigitalPower_SDK_5_06_00_00\solutions\tida_010210工程

1.为什么在编译器中开启优化为Optimization level (--opt_level, -O) =2，Speed vs. size trade-offs (--opt_for_speed, -mf)=5，ADC结果读取时间与PWM比较值写入时间会缩短数倍。我使用CPUTIME1测得的时间，ADC读取次数为13次，EPWM比较值共写入三次，各部分耗时如下

无优化(单位us)
设置的中断频率	实际频率	中断函数总耗时	ADC采样	epwm更新
50k	28.5k	32.8us	10.6us	6.5us



优化(单位us)
设置的中断频率	实际频率	中断函数总耗时	ADC采样	epwm更新
50k	50k	7.6us	1.25us	2us

2.在“显示 C2000™ 控制 MCU 优化信号链的实时基准测试”文档中关于ADC结果读取时间与EPWM比较值写入时间远远短于我使用CPUTIME1测试的时间，这是为什么？文档中说明ADC单次读取时间为两个周期即20ns，EPWM单次写入时间为三个周期即30ns，文档说明如图所示

5 天前

0 Vivian Gao 4 天前

TI__Mastermind 44750 points

看起来你在代码中使用了中断服务例程（ISR）来计时ADC读取和EPWM写入操作。进入、执行、服务、清除和退出中断都会引入延迟。如果在ISR中使用变量，还会生成等效的写入语句，从而占用CPU周期。使用CPU定时器也会引入延迟，因此在比较2-3周期事件时，这可能不是测量ADC/EPWM寄存器读写操作的最佳方法。以应用笔记表格为例，其中显示ADC读取需要2个周期，EPWM写入需要3个周期。这意味着在F280049微控制器上，当系统时钟（SYSCLK）为100MHz时，ADC转换完成后读取结果需要2个周期*(1/100MHz) = 20纳秒；而EPWM（例如写入TBPRD或CMPx寄存器）则需要3个周期*(1/100MHz) = 30纳秒。由于涉及的延迟，这些操作无法通过ISR方法直接测量/比较。

0 X W 4 天前回复 Vivian Gao

Prodigy 50 points

好的，谢谢您的回答！

在F280049微控制器上，系统时钟（SYSCLK）已设置为100MHz，我的测速程序如下

#define ANPC_INV_HAL_VG_A_FB    ADC_readResult(ANPC_INV_VGRID_A_ADCRESULT_BASE,\
                                    ANPC_INV_VGRID_A_ADC_SOC_NO)
    uint32_t start2 = CPUTimer_getTimerCount(CPUTIMER1_BASE);
    ANPCINV_vGrid_A_sensed_pu = ((float32_t)ANPC_INV_HAL_VG_A_FB *
                                ANPC_INV_ADC_PU_SCALE_FACTOR -
                                ANPCINV_vGrid_A_sensedOffset_pu) * 2.0f;

    uint32_t end2 = CPUTimer_getTimerCount(CPUTIMER1_BASE);

    uint32_t delta2 = start2 - end2;
    volatile float32_t adc_freq2 = delta2 / 100.0f;

测得的一次采样读取的时间为0.04us，大致符合您说的时间。

我有两个疑问：

1.为什么需要开启两个优化后才能达到该理论速度？

2.我修改驱动移植代码到F28379D芯片后，同样的代码测得一次采样读取的时间为0.2us，这是什么原因导致的？syscfg生成的ADC初始化代码如下

void ADC_init(){
	myADCA_init();
	myADCB_init();
	myADCC_init();
	myADCD_init();
}

void myADCA_init(){
	//
	// Configures the analog-to-digital converter module prescaler.
	//
	ADC_setPrescaler(myADCA_BASE, ADC_CLK_DIV_2_0);
	//
	// Configures the analog-to-digital converter resolution and signal mode.
	//
	ADC_setMode(myADCA_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
	//
	// Sets the timing of the end-of-conversion pulse
	//
	ADC_setInterruptPulseMode(myADCA_BASE, ADC_PULSE_END_OF_CONV);
	//
	// Powers up the analog-to-digital converter core.
	//
	ADC_enableConverter(myADCA_BASE);
	//
	// Delay for 1ms to allow ADC time to power up
	//
	DEVICE_DELAY_US(500);
	//
	// SOC Configuration: Setup ADC EPWM channel and trigger settings
	//
	// Disables SOC burst mode.
	//
	ADC_disableBurstMode(myADCA_BASE);
	//
	// Sets the priority mode of the SOCs.
	//
	ADC_setSOCPriority(myADCA_BASE, ADC_PRI_ALL_ROUND_ROBIN);
	//
	// Start of Conversion 0 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 0
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN0
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN0, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER0, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 1 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 1
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN1
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN1, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER1, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 2 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 2
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN2
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN2, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER2, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 3 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 3
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN3
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER3, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN3, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER3, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 4 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 4
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN4
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER4, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN4, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER4, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 5 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 5
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN5
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER5, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN5, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER5, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 6 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 6
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN14
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER6, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN14, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER6, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 7 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 7
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN15
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCA_BASE, ADC_SOC_NUMBER7, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN15, 50U);
	ADC_setInterruptSOCTrigger(myADCA_BASE, ADC_SOC_NUMBER7, ADC_INT_SOC_TRIGGER_NONE);
	//
	// ADC Interrupt 1 Configuration
	// 		Source	: ADC_SOC_NUMBER7
	// 		Interrupt Source: enabled
	// 		Continuous Mode	: disabled
	//
	//
	ADC_setInterruptSource(myADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER7);
	ADC_clearInterruptStatus(myADCA_BASE, ADC_INT_NUMBER1);
	ADC_disableContinuousMode(myADCA_BASE, ADC_INT_NUMBER1);
	ADC_enableInterrupt(myADCA_BASE, ADC_INT_NUMBER1);
}

void myADCB_init(){
	//
	// Configures the analog-to-digital converter module prescaler.
	//
	ADC_setPrescaler(myADCB_BASE, ADC_CLK_DIV_2_0);
	//
	// Configures the analog-to-digital converter resolution and signal mode.
	//
	ADC_setMode(myADCB_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
	//
	// Sets the timing of the end-of-conversion pulse
	//
	ADC_setInterruptPulseMode(myADCB_BASE, ADC_PULSE_END_OF_CONV);
	//
	// Powers up the analog-to-digital converter core.
	//
	ADC_enableConverter(myADCB_BASE);
	//
	// Delay for 1ms to allow ADC time to power up
	//
	DEVICE_DELAY_US(500);
	//
	// SOC Configuration: Setup ADC EPWM channel and trigger settings
	//
	// Disables SOC burst mode.
	//
	ADC_disableBurstMode(myADCB_BASE);
	//
	// Sets the priority mode of the SOCs.
	//
	ADC_setSOCPriority(myADCB_BASE, ADC_PRI_ALL_ROUND_ROBIN);
	//
	// Start of Conversion 0 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 0
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN0
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCB_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN0, 50U);
	ADC_setInterruptSOCTrigger(myADCB_BASE, ADC_SOC_NUMBER0, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 1 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 1
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN1
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCB_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN1, 50U);
	ADC_setInterruptSOCTrigger(myADCB_BASE, ADC_SOC_NUMBER1, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 2 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 2
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN2
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCB_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN2, 50U);
	ADC_setInterruptSOCTrigger(myADCB_BASE, ADC_SOC_NUMBER2, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 3 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 3
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN3
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCB_BASE, ADC_SOC_NUMBER3, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN3, 50U);
	ADC_setInterruptSOCTrigger(myADCB_BASE, ADC_SOC_NUMBER3, ADC_INT_SOC_TRIGGER_NONE);
}

void myADCC_init(){
	//
	// Configures the analog-to-digital converter module prescaler.
	//
	ADC_setPrescaler(myADCC_BASE, ADC_CLK_DIV_2_0);
	//
	// Configures the analog-to-digital converter resolution and signal mode.
	//
	ADC_setMode(myADCC_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
	//
	// Sets the timing of the end-of-conversion pulse
	//
	ADC_setInterruptPulseMode(myADCC_BASE, ADC_PULSE_END_OF_CONV);
	//
	// Powers up the analog-to-digital converter core.
	//
	ADC_enableConverter(myADCC_BASE);
	//
	// Delay for 1ms to allow ADC time to power up
	//
	DEVICE_DELAY_US(500);
	//
	// SOC Configuration: Setup ADC EPWM channel and trigger settings
	//
	// Disables SOC burst mode.
	//
	ADC_disableBurstMode(myADCC_BASE);
	//
	// Sets the priority mode of the SOCs.
	//
	ADC_setSOCPriority(myADCC_BASE, ADC_PRI_ALL_ROUND_ROBIN);
	//
	// Start of Conversion 0 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 0
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN0
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCC_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN0, 50U);
	ADC_setInterruptSOCTrigger(myADCC_BASE, ADC_SOC_NUMBER0, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 1 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 1
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN1
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCC_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN1, 50U);
	ADC_setInterruptSOCTrigger(myADCC_BASE, ADC_SOC_NUMBER1, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 2 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 2
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN2
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCC_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN2, 50U);
	ADC_setInterruptSOCTrigger(myADCC_BASE, ADC_SOC_NUMBER2, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 3 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 3
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN3
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCC_BASE, ADC_SOC_NUMBER3, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN3, 50U);
	ADC_setInterruptSOCTrigger(myADCC_BASE, ADC_SOC_NUMBER3, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 4 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 4
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN4
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCC_BASE, ADC_SOC_NUMBER4, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN4, 50U);
	ADC_setInterruptSOCTrigger(myADCC_BASE, ADC_SOC_NUMBER4, ADC_INT_SOC_TRIGGER_NONE);
}

void myADCD_init(){
	//
	// Configures the analog-to-digital converter module prescaler.
	//
	ADC_setPrescaler(myADCD_BASE, ADC_CLK_DIV_2_0);
	//
	// Configures the analog-to-digital converter resolution and signal mode.
	//
	ADC_setMode(myADCD_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
	//
	// Sets the timing of the end-of-conversion pulse
	//
	ADC_setInterruptPulseMode(myADCD_BASE, ADC_PULSE_END_OF_CONV);
	//
	// Powers up the analog-to-digital converter core.
	//
	ADC_enableConverter(myADCD_BASE);
	//
	// Delay for 1ms to allow ADC time to power up
	//
	DEVICE_DELAY_US(500);
	//
	// SOC Configuration: Setup ADC EPWM channel and trigger settings
	//
	// Disables SOC burst mode.
	//
	ADC_disableBurstMode(myADCD_BASE);
	//
	// Sets the priority mode of the SOCs.
	//
	ADC_setSOCPriority(myADCD_BASE, ADC_PRI_ALL_ROUND_ROBIN);
	//
	// Start of Conversion 0 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 0
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN0
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCD_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN0, 50U);
	ADC_setInterruptSOCTrigger(myADCD_BASE, ADC_SOC_NUMBER0, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 1 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 1
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN1
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCD_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN1, 50U);
	ADC_setInterruptSOCTrigger(myADCD_BASE, ADC_SOC_NUMBER1, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 2 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 2
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN2
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCD_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN2, 50U);
	ADC_setInterruptSOCTrigger(myADCD_BASE, ADC_SOC_NUMBER2, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 3 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 3
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN3
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCD_BASE, ADC_SOC_NUMBER3, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN3, 50U);
	ADC_setInterruptSOCTrigger(myADCD_BASE, ADC_SOC_NUMBER3, ADC_INT_SOC_TRIGGER_NONE);
	//
	// Start of Conversion 4 Configuration
	//
	//
	// Configures a start-of-conversion (SOC) in the ADC and its interrupt SOC trigger.
	// 	  	SOC number		: 4
	//	  	Trigger			: ADC_TRIGGER_EPWM1_SOCA
	//	  	Channel			: ADC_CH_ADCIN4
	//	 	Sample Window	: 50 SYSCLK cycles
	//		Interrupt Trigger: ADC_INT_SOC_TRIGGER_NONE
	//
	ADC_setupSOC(myADCD_BASE, ADC_SOC_NUMBER4, ADC_TRIGGER_EPWM1_SOCA, ADC_CH_ADCIN4, 50U);
	ADC_setInterruptSOCTrigger(myADCD_BASE, ADC_SOC_NUMBER4, ADC_INT_SOC_TRIGGER_NONE);
}

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TMS320F280049C: 程序中ADC采样读取耗时与PWM写入耗时