Pulse 280 Specifications download pdf (Page 22)

Operational Description of HRPWM

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Example 3. Initializing With a Scale Factor Value (continued)

while (MEP_ScaleFactor[3] == 0) SFO_MepDis(3); //SFO for HRPWM3

while (MEP_ScaleFactor[4] == 0) SFO_MepDis(4); //SFO for HRPWM4

// Initialize a common seed variable MEP_ScaleFactor[0] // required for all SFO functions

MEP_ScaleFactor[0] = MEP_ScaleFactor[1]; // Common variable for SFOMepEn(n) function

Step 4. Application Code

While the application is running, fluctuations in both device temperature and supply voltage may be

expected. To be sure that optimal Scale Factors are used for each ePWM module, the SFO function

should be re-run periodically as part of a slower back-ground loop. Some examples of this are shown

here.

NOTE: See the HRPWM_SFO example in the C280x C/C++ Header Files and Peripheral Examples

(SPRC191) available from the TI website.

High-Resolution Pulse Width Modulator (HRPWM) SPRU924F– April 2005– Revised October 2011

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Pulse 280 Specifications Page 22