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SPI communication of L6482

lcc1111
Associate
Hello, I encountered some issues while using SPI to control L6482:
1. My read/write SPI logic seems to have failed, unable to read/write normally. Is this a problem with my SPI timing?
This is the timing sequence for me to retrieve the status register.
lcc1111_2-1735090518149.png
This is the timing sequence for me to read the 0x15 register.
lcc1111_3-1735090550487.png
But their SDO pin has always been at a low level.
2. Regarding the control process of the stepper motor through L6482, I saw on  <<an4290-l647x-l648x-and-powerstep01-family communication protocol microelectronics>>  that it says run the RUN command first, then run GOTO, run SPEED and POSITION commands, and finally SOFTSTOP. Is that correct? I don't understand what SPEED and POSITION mean here?
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