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  • I suggest you to open the examples of the SPI library and check them. Anyway, the code should be byte result[4]; for (i = 0; i < 4; i++) result[i] = SPI.transfer(0x00); and you will find in result the 32 bits you need Commented Apr 27, 2016 at 12:45
  • I already did that. but the energy chip I am using is STPM10 and it suggests that I should use simplex synchronous SPI where the MOSI is not connected. there is just a timing diagram to switch from reading bytes and writing bytes. When I used SPI.transfer(), The data is not stable and I think not reliable Commented Apr 29, 2016 at 6:10
  • How do you say it is not reliable? The peripheral is full duplex, and according to the way it works the only way to receive data is by sending dummy data. If MOSI is not connected, well, it doesn't matter; note however that you can't use the MOSI pin for other tasks. By the way, did you remember to correctly set the slave select pin of the other peripheral? Did you use the SS pin on the arduino board or another one? Commented Apr 29, 2016 at 9:55