DF_CON_PORT &=~_BV(DF_CS_1)中BV是什么意思?
本帖最后由 liudingding 于 2013-8-9 10:31 编辑参考一段程序,是用winavr写的,我只会用ICC,请问BV是什么意思?
#define DF_STATE PC2
#define DF_CS_1 PC1
#define DF_SELECT_1 DF_CON_PORT &=~_BV(DF_CS_1)
#define DF_DESELECT_1 DF_CON_PORT |=_BV(DF_CS_1)
1<<DF_CS_1
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