s3c2410下的GPIO按键驱动，可适用于一般的arm9开发板之上-GPIO under s3c2410 button-driven, applied to the general development board on arm9

driver for the MAX6675, a chip which interfaces to a K-type thermocouple over a simple SPI bus. The driver implements a software SPI port, so there is no need for dedicateed hardware- any 3 GPIO pins can be used.