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Hi, I am using the TMS320F28335 to read data from a AD7657 ADC using a parallel interface without much luck. The examples I've found all seem to be using SPI.
I have already configured the external zone. XINTF clock is enabled, the timing registers are set, x16 data bus selected, the appropriate XD, XA, XZCS, etc. are selected.
A pointer to the first memory location of zone 6 is used to read the data from the external zone.
A potentiometer is connected to the input of the ADC. I am viewing the contents of zone 6 using the Memory Browser in CCS. There seems to be random values populating the memory. I have command the ADC to reset so I expect zeros to be returned.
Has anyone else worked with peripherals which communicate to external zones outside of SPI that can point in the right direction?
Hi Tommy,
Thank you for your feedback. I took your advice and configured the XINTF pins as GPIOs. Unfortunately, the XRD pin is not a GPIO and therefore, I couldn't manually establish communication.
I did end up solving the issue however, I reverted back to my old configuration and initiated an ADC read by using a pointer to the memory mapped address. The following post guided me through this process:
https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/215317/760567
Thanks,
Himesh