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Forum Post: RE: GUIX Queue not working?

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The RSPI works with DTC only in 32 bit transfer mode because RSPI has 32 bit FIFO, so it'd make most sense for transfer driver to fill whole FIFO all at once. You can probably send some dummy data in the other 3 bytes, if necessary. S1 devices can use RSPI with 16 bit transfers because their FIFO registers are only 16 bit. However, I'm almost certain that pins you're using with RSPI are also connected to SCI peripheral. In Simple SPI on SCI, you can use DTC with 8 bit transfers and for applications such as touch controllers, its feature set should be sufficient. Regards

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