Other Parts Discussed in Thread: TMDSRSLVR
I am trying to connect a resolver to a Launchpad 28069M using a "TMDSRSLVR C2000 Resolver to Digital Conversion Kit". I followed the hardware connection proposed by Mathworks
which was also recommended in
I am able to generate the exciation using ePWM via GPIO2 and to read in the COS/SIN feedback voltages using ADCIN1A/B. Though, I am facing the problem that the SIN/COS voltages are in the range of +/-0.5V (1Vpp). As the Launchpad ADC's input voltage range is 0-3V the digital signals are equal to zero when the voltages are negative. Can somebody help me out here?
The alternative would be to insert a CPU (F28335) in the resolver board, let it do the resolver evaluation, and send the result to the launchpad via SPI. I am failing to implement this solution as well, as there is no documentation on the SPI signal sent by the resolver evaluation software so I do not know how to configure the receive block in Simulink.
Can anyone support me in either one of these approaches?
Many thanks in advance