SPI
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Revision as of 18:43, 16 November 2009 by FabienM (Talk | contribs) (New page: This page will summarize the informations to use the SPI bus on our boards. == Overview == [http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus SPI] ('''S'''erial '''P'''eripher...)
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
- ADC : [Max1027]
- EEPROM : [93LCXX]
Links
- SPI description on wikipedia.
