TMS320F28379D: eQEP initialization from known electrical angle of the motor.

Do you still connect the resolver to C2000 for detecting the initial rotor position? If not, you have to run the alignment process to do the QEP calibration. 

I connect the resolver to a board that emulates the quadrature encoder, the output of that gets plugged into the eQEP1 connection on the design drive. Basically we are converting a resolver to the quadrature encoder but they do not want to spin the motor to calibrate the eQEP, so on startup while the motor is stationary they want me to read the electrical angle from the resolver over SPI and program the eQEP registers so that we can run the motor right away!

Hello Duane, You may run the motor using angle info from resolver until Z pulse is detected, which will also provide the offset to be used. In case if you have only resolver, it could serve as both angle and speed transducer. You can also use the resolver for angle, and use the emulated quadrature output for speed measurement, in which case no special register write are needed. 

Setup of the resolver to QEP chip is done at startup over SPI, I then read the electrical angle from the resolver chip and program what into the eQEP registers. The eQEP must be used at runtime without waiting for an index to calibrate, the hardware is fixed.

Duane, sorry about the delay. Once you know the initial angle, you can always add on what you compute from QEP. I am not clear what is that you intent to write to QEP registers.

I have an AD2S1210 resolver to QEP converter chip on they system setup to send pulses to the eQEP1 module

At startup while the motor is not moving I want to read the resolver angle from the AD2S1210 chip by SPI, lets say it it tells me 35deg electrical, what do I program into the eQEP so that I can immediately run the motor from the eQEP without needing to calibrate the eQEP by spinning the motor open loop until it calibrates to the marker pulse.

The QEP position counter can be initialized via software.  Refer to the section "Position Counter Initialization" in the QEP chapter of the device Technical Reference Manual (TRM). 

The TRM is available on the F2837x product page: https://www.ti.com/product/TMS320F28379D

Also refer to the driverlib documentation which can be found in C2000Ware:  

C:\ti\c2000\C2000Ware_<version>\device_support\f2837xd\docs\html

Regards

Lori