CS_EVEN_PRIMARY
#define CS_EVEN (CS_EVEN_PRIMARY | CS_EVEN_SECONDARY)
cs_mode |= CS_EVEN_PRIMARY;
if (cs_mode & (CS_EVEN_PRIMARY | CS_ODD_PRIMARY))
cs_mode = CS_EVEN_PRIMARY | CS_ODD_PRIMARY;
int cs_mode = CS_EVEN_PRIMARY | CS_ODD_PRIMARY;