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I wanted to interface Microchip's 12-bit ADC chip (MCP3008) to the Olinuxino MICRO board, which uses the Allwinner A20 processor. Unfortunately, no kernel module supporting full-duplex SPI mode exists yet, or at least I was not able to find a working one. If we can not write and read at the same time we are limited to reading only 8bits from the ADC, which is otherwise a 12-bit SAR converter.
Here's some code implementing a bit-banged SPI specifically tailored to read out the MCP3008. It is written in python and uses the pyA20 GPI/O library by Olimex.
Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/transist/public_html/comments/comments.php:42 Stack trace: #0 /home/transist/public_html/post/stdal/post36.htm(144): require() #1 {main} thrown in /home/transist/public_html/comments/comments.php on line 42