SPI

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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.

Tested SPI chips

• ADC : Max1027
• EEPROM : 93LCXX

Links

• SPI description on wikipedia.