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=== SPI ===
SPI (Serial Peripheral Interface Bus) is a synchronous serial data link. Devices communicate in master/slave mode where the master device initiates the data frame. Multiple slave devices are allowed with individual slave select (chip select) lines. It can be fater than I2C protocol and it is uasully used i short distances, it uses CMOS level voltage (1V8). Omap SPI is named McSPI. Omap McSPI have the next caractheristics: - Supports [http://en.wikipedia.org/wiki/Direct_memory_access DMA] for data transfer operations, for reduce CPU usage.<br>- Supports full duplex data transfer operations, <span lang="en" class="short_text" id="result_box"><span class="hps">simultaneous comunication between master and slave.</span></span><br>- Supports configuration of number of wordlength.<br>- Supports configuration of phase and polarity of the device functional clock.<br>- Support configuration of the bitrate.Between 1.5 KHz and 48 MHz<br>
Omap McSPI peripheral use five signals:
- McSPI_CSO: Chip Select 0.<br> - McSPI_CS1: Chip Select 1.<br> - McSPI_SOMI: Slave output master input data.<br> - McSPI_SIMO: Slave input master output data.<br> - McSPI_CLK: Clock.<br>
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More information:
[http://omappedia.org/wiki/Kernel_McSPI http://omappedia.org/wiki/Kernel_McSPI]
[http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus]
Under construction