From what you explain this seems like a pinmux issue. Please post which pins does your McASP use, and which pins are used for connection to the I/O expander. Check whether your McASP pinmux doesn't get overwritten by the expander pinmux.
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From what you explain this seems like a pinmux issue. Please post which pins does your McASP use, and which pins are used for connection to the I/O expander. Check whether your McASP pinmux doesn't get overwritten by the expander pinmux.