Texas Instruments 28xxx, TMS320x28xx 1. Submodule Configuration Parameters continued, Overview

www.ti.com

		Overview
	Table 2-1. Submodule Configuration Parameters (continued)
Submodule	Configuration Parameter or Option
Event-trigger (ET)	∙	Enable the ePWM events that will trigger an interrupt.
	∙	Enable ePWM events that will trigger an ADC start-of-conversion event.
	∙	Specify the rate at which events cause triggers (every occurrence or every second or third
		occurrence)
	∙	Poll, set, or clear event flags

Code examples are provided in the remainder of this document that show how to implement various ePWM module configurations. These examples use the constant definitions shown in Example 2-1. These definitions are also used in the C280x C/C++ Header Files and Peripheral Examples (SPRC191).

Example 2-1. Constant Definitions Used in the Code Examples

//TBCTL (Time-Base Control)

//= = = = = = = = = = = = = = = = = = = = = = = = = =

//TBCTR MODE bits

#define	TB_COUNT_UP	0x0
#define	TB_COUNT_DOWN	0x1
#define	TB_COUNT_UPDOWN	0x2
#define	TB_FREEZE	0x3
// PHSEN bit
#define	TB_DISABLE	0x0
#define	TB_ENABLE	0x1
// PRDLD bit
#define	TB_SHADOW	0x0
#define	TB_IMMEDIATE	0x1
// SYNCOSEL bits
#define	TB_SYNC_IN	0x0
#define	TB_CTR_ZERO	0x1
#define	TB_CTR_CMPB	0x2
#define	TB_SYNC_DISABLE	0x3
// HSPCLKDIV and CLKDIV bits
#define	TB_DIV1	0x0
#define	TB_DIV2	0x1
#define	TB_DIV4	0x2
// PHSDIR bit
#define	TB_DOWN	0x0
#define	TB_UP	0x1

//CMPCTL (Compare Control)

//= = = = = = = = = = = = = = = = = = = = = = = = = =

//LOADAMODE and LOADBMODE bits

#define	CC_CTR_ZERO	0x0
#define	CC_CTR_PRD	0x1
#define	CC_CTR_ZERO_PRD	0x2
#define	CC_LD_DISABLE	0x3
// SHDWAMODE and SHDWBMODE bits
#define	CC_SHADOW	0x0
#define	CC_IMMEDIATE	0x1

//AQCTLA and AQCTLB (Action-qualifier Control)

//= = = = = = = = = = = = = = = = = = = = = = = = = =

//ZRO, PRD, CAU, CAD, CBU, CBD bits

#define	AQ_NO_ACTION	0x0
#define	AQ_CLEAR	0x1
#define	AQ_SET	0x2
#define	AQ_TOGGLE	0x3

//DBCTL (Dead-Band Control)

//= = = = = = = = = = = = = = = = = = = = = = = = = =

//MODE bits

#define	DB_DISABLE	0x0
#define	DBA_ENABLE	0x1
#define	DBB_ENABLE	0x2
#define DB_FULL_ENABLE 0x3
// POLSEL bits
#define	DB_ACTV_HI	0x0
#define	DB_ACTV_LOC	0x1
#define	DB_ACTV_HIC	0x2
SPRU791D–November 2004–Revised October 2007		ePWM Submodules	21

Submit Documentation Feedback