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SPI in CC2541

Other Parts Discussed in Thread: CC2541

I am using SPI communication using CC2541. I have one query

 byte spi_write(uint8 data)

       U0DBUF = data;

1. The data in U0DBUF will transfer from MSB or LSB?

2)How can change the direction of shifting in and out in SPI Bus.

3)Is it possible to have 5k buffer in CC2541/30. Because it has only 4k RAM. I mean to ask is, is there any possible to store/access that buffer from flash