Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/MIMXRT1021/SAI1/TFR[2]#0x0
WCP=WCP_0
SAI Transmit FIFO Register
Read FIFO Pointer
Write FIFO Pointer
Write Channel Pointer
0 (WCP_0): No effect.
1 (WCP_1): FIFO combine is enabled for FIFO writes and this FIFO will be written on the next FIFO write.
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https://github.com/cmsis-svd/cmsis-svd-data