Application of the APWM Mode
www.ti.com
370
SPRUI07–March 2020
Submit Documentation Feedback
Copyright © 2020, Texas Instruments Incorporated
Enhanced Capture (eCAP)
Example 5-1. Code Snippet for APWM Mode
// Code snippet for APWM mode Example 2
// Initialization Time
//=======================
// ECAP module 1 config
ECap1Regs.ECCTL2.bit.CAP_APWM = EC_APWM_MODE;
ECap1Regs.CAP1 = 1200; // Set period value
ECap1Regs.CTRPHS = 0; // make eCAP1 reference phase = zero
ECap1Regs.ECCTL2.bit.APWMPOL = EC_ACTV_HI;
ECap1Regs.ECCTL2.bit.SYNCI_EN = EC_DISABLE; // No sync in for Master
ECap1Regs.ECCTL2.bit.SYNCO_SEL = EC_CTR_PRD; // eCAP1 is Master
ECap1Regs.ECCTL2.bit.TSCTRSTOP = EC_RUN; // Allow TSCTR to run
// ECAP module 2 config
ECap2Regs.CAP1 = 1200; // Set period value
ECap2Regs.CTRPHS = 800; // Phase offset = 1200-400 = 120 deg
ECap2Regs.ECCTL2.bit.CAP_APWM = EC_APWM_MODE;
ECap2Regs.ECCTL2.bit.APWMPOL = EC_ACTV_HI;
ECap2Regs.ECCTL2.bit.SYNCI_EN = EC_ENABLE; // slaved off master
ECap2Regs.ECCTL2.bit.SYNCO_SEL = EC_SYNCI; // sync "flow-through"
ECap2Regs.ECCTL2.bit.TSCTRSTOP = EC_RUN; // Allow TSCTR to run
// ECAP module 3 config
ECap3Regs.CAP1 = 1200; // Set period value
ECap3Regs.CTRPHS = 400; // Phase offset = 1200-800 = 240 deg
ECap3Regs.ECCTL2.bit.CAP_APWM = EC_APWM_MODE;
ECap3Regs.ECCTL2.bit.APWMPOL = EC_ACTV_HI;
ECap3Regs.ECCTL2.bit.SYNCI_EN = EC_ENABLE; // slaved off master
ECap3Regs.ECCTL2.bit.SYNCO_SEL = EC_SYNCO_DIS; // "break the chain"
ECap3Regs.ECCTL2.bit.TSCTRSTOP = EC_RUN; // Allow TSCTR to run
// Run Time (Note: Example execution of one run-time instant)
//============================================================
// All phases are set to the same duty cycle
ECap1Regs.CAP2 = 700; // Set Duty cycle i.e. compare value = 700
ECap2Regs.CAP2 = 700; // Set Duty cycle i.e. compare value = 700
ECap3Regs.CAP2 = 700; // Set Duty cycle i.e. compare value = 700
To Next Page
Loading...
Need help?
General
