utils.h

ATmega8实现USB接口（采用USB的CDC类

#ifndef __utils_h_included__
#define __utils_h_included__

#ifndef uchar
#define uchar   unsigned char
#endif

#ifndef uint
#define uint    unsigned int
#endif

typedef union{
    uint    word;
    uchar   bytes[2];
}utilWord_t;

typedef union{
    unsigned long   dword;
    uchar           bytes[4];
}utilDword_t;

/* ------------------------------------------------------------------------- */

#define UTIL_CONCAT(a, b)           a ## b
#define UTIL_CONCAT_EXPANDED(a, b)  UTIL_CONCAT(a, b)

#define UTIL_INTERRUPT(signame)                         \
    void signame (void) __attribute__ ((interrupt));    \
    void signame (void)

#define UTIL_BIN4(x)        (uchar)((0##x & 01000)/64 + (0##x & 0100)/16 + (0##x & 010)/4 + (0##x & 1))
#define UTIL_BIN8(hi, lo)   (uchar)(UTIL_BIN4(hi) * 16 + UTIL_BIN4(lo))

/* ------------------------------------------------------------------------- */

static inline uchar utilHi8(uint x)
{
utilWord_t converter;

    converter.word = x;
    return converter.bytes[1];
}

/* ------------------------------------------------------------------------- */

/* PORT bit macros */

#define UTIL_ARG1(a, b) a
#define UTIL_ARG2(a, b) b

#define UTIL_PBIT_SET(varbase, pinspec)  UTIL_CONCAT_EXPANDED(varbase, UTIL_ARG1(pinspec)) |= (1 << (UTIL_ARG2(pinspec)))
#define UTIL_PBIT_CLR(varbase, pinspec)  UTIL_CONCAT_EXPANDED(varbase, UTIL_ARG1(pinspec)) &= ~(1 << (UTIL_ARG2(pinspec)))

#define PORT_OUT(pinspec)       UTIL_CONCAT_EXPANDED(PORT, UTIL_ARG1(pinspec))
#define PORT_IN(pinspec)        UTIL_CONCAT_EXPANDED(PIN, UTIL_ARG1(pinspec))
#define PORT_DDR(pinspec)       UTIL_CONCAT_EXPANDED(DDR, UTIL_ARG1(pinspec))
#define PORT_BIT(pinspec)       UTIL_ARG2(pinspec)

#define PORT_PIN_SET(pinspec)   UTIL_CONCAT_EXPANDED(PORT, UTIL_ARG1(pinspec)) |= (1 << (UTIL_ARG2(pinspec)))
#define PORT_PIN_CLR(pinspec)   UTIL_CONCAT_EXPANDED(PORT, UTIL_ARG1(pinspec)) &= ~(1 << (UTIL_ARG2(pinspec)))
#define PORT_PIN_VALUE(pinspec) (UTIL_CONCAT_EXPANDED(PIN, UTIL_ARG1(pinspec)) & (1 << (UTIL_ARG2(pinspec))))

#define PORT_DDR_SET(pinspec)   UTIL_CONCAT_EXPANDED(DDR, UTIL_ARG1(pinspec)) |= (1 << (UTIL_ARG2(pinspec)))
#define PORT_DDR_CLR(pinspec)   UTIL_CONCAT_EXPANDED(DDR, UTIL_ARG1(pinspec)) &= ~(1 << (UTIL_ARG2(pinspec)))
#define PORT_DDR_VALUE(pinspec) (UTIL_CONCAT_EXPANDED(DDR, UTIL_ARG1(pinspec)) & (1 << (UTIL_ARG2(pinspec))))

/* ------------------------------------------------------------------------- */

#endif /* __utils_h_included__ */