SPI
From ArmadeusWiki
This page will summarize the informations to use the SPI bus on our boards.
Overview
SPI (Serial Peripheral Interface) is a 3-wire full-duplex serial bus. Wires used in SPI are :
- MOSI, Master Output Slave Input : send data to slave.
- MISO, Master Input Slave Output : receive data from slave.
- SCLK, : Serial Clock signal used to synchronise the transmission. (In imx27 (apf27) maximum frequency of SCLK is 22.167MHz in master mode and 16.625 in slave mode.
- SSx, Slave Select : used to select the slave for communication with master.
On APF27, the imx27 contains 3 SPI devices that can be configured in master or slave. APF9328 (imxL) contains 2 SPI.
Linux configuration
Linux user space C code
Tested SPI chips
Links
- SPI description on wikipedia.
