Texas Instruments TMS320C6745 DSP - ECAP Initialization for CAP Mode Delta Time, Rising and Falling Edge Triggers

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SPRUH91D–March 2013–Revised September 2016
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Enhanced Capture (eCAP) Module
Table 13-4. ECAP Initialization for CAP Mode Delta Time, Rising and Falling Edge Triggers
Register Bit Value
ECCTL1 CAP1POL EC_RISING
ECCTL1 CAP2POL EC_FALLING
ECCTL1 CAP3POL EC_RISING
ECCTL1 CAP4POL EC_FALLING
ECCTL1 CTRRST1 EC_DELTA_MODE
ECCTL1 CTRRST2 EC_DELTA_MODE
ECCTL1 CTRRST3 EC_DELTA_MODE
ECCTL1 CTRRST4 EC_DELTA_MODE
ECCTL1 CAPLDEN EC_ENABLE
ECCTL1 PRESCALE EC_DIV1
ECCTL2 CAP_APWM EC_CAP_MODE
ECCTL2 CONT_ONESHT EC_CONTINUOUS
ECCTL2 SYNCO_SEL EC_SYNCO_DIS
ECCTL2 SYNCI_EN EC_DISABLE
ECCTL2 TSCTRSTOP EC_RUN
Example 13-4. Code Snippet for CAP Mode Delta Time, Rising and Falling Edge Triggers
// Code snippet for CAP mode Delta Time, Rising and Falling edge triggers
// Run Time ( e.g. CEVT1 triggered ISR call)
//==========================================
// Note: here Time-stamp directly represents the Duty cycle values.
DutyOnTime1 = ECAPxRegs.CAP2; // Fetch Time-Stamp captured at T2
DutyOffTime1 = ECAPxRegs.CAP3; // Fetch Time-Stamp captured at T3
DutyOnTime2 = ECAPxRegs.CAP4; // Fetch Time-Stamp captured at T4
DutyOffTime2 = ECAPxRegs.CAP1; // Fetch Time-Stamp captured at T1
Period1 = DutyOnTime1 + DutyOffTime1;
Period2 = DutyOnTime2 + DutyOffTime2;