Hello Honoju,
I suggest you could do a test first.
1.spi master was connected to BMP388, read BMP388 chip id and capture SPI waveform by logic analyzer.
2. spi master was connected to BMP388 and your other spi slave device, read BMP388 chip id and capture SPI waveform by logic analyzer.
Compare SPI waveform between step 1 and step 2.
And by the way, besides on BMP388, what is other spi slave device you used?
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