avrhardware.h

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/*
 *
 * Authors:             Jason Hill, Philip Levis, Nelson Lee
 *
 *
 */

#ifndef TOSH_AVRHARDWARE_H
#define TOSH_AVRHARDWARE_H

#include <io.h>
#include <sig-avr.h>
#include <interrupt.h>
#include <wdt.h>

#define TOSH_ASSIGN_PIN(name, port, bit) \
static inline void TOSH_SET_##name##_PIN() {sbi(PORT##port , bit);} \
static inline void TOSH_CLR_##name##_PIN() {cbi(PORT##port , bit);} \
static inline char TOSH_READ_##name##_PIN() {return 0x01 & (inp(PIN##port) >> bit);} \
static inline void TOSH_MAKE_##name##_OUTPUT() {sbi(DDR##port , bit);} \
static inline void TOSH_MAKE_##name##_INPUT() {cbi(DDR##port , bit);} 

#define TOSH_ASSIGN_OUTPUT_ONLY_PIN(name, port, bit) \
static inline void TOSH_SET_##name##_PIN() {sbi(PORT##port , bit);} \
static inline void TOSH_CLR_##name##_PIN() {cbi(PORT##port , bit);} \
static inline void TOSH_MAKE_##name##_OUTPUT() {;} 

#define TOSH_ALIAS_OUTPUT_ONLY_PIN(alias, connector)\
static inline void TOSH_SET_##alias##_PIN() {TOSH_SET_##connector##_PIN();} \
static inline void TOSH_CLR_##alias##_PIN() {TOSH_CLR_##connector##_PIN();} \
static inline void TOSH_MAKE_##alias##_OUTPUT() {} \

#define TOSH_ALIAS_PIN(alias, connector) \
static inline void TOSH_SET_##alias##_PIN() {TOSH_SET_##connector##_PIN();} \
static inline void TOSH_CLR_##alias##_PIN() {TOSH_CLR_##connector##_PIN();} \
static inline char TOSH_READ_##alias##_PIN() {return TOSH_READ_##connector##_PIN();} \
static inline void TOSH_MAKE_##alias##_OUTPUT() {TOSH_MAKE_##connector##_OUTPUT();} \
static inline void TOSH_MAKE_##alias##_INPUT()  {TOSH_MAKE_##connector##_INPUT();} 

// We need slightly different defs than SIGNAL, INTERRUPT
#define TOSH_SIGNAL(signame)					\
void signame() __attribute__ ((signal, spontaneous, C))

#define TOSH_INTERRUPT(signame)				\
void signame() __attribute__ ((interrupt, spontaneous, C))

/* Watchdog Prescaler
 */
enum {
  TOSH_period16 = 0x00, // 47ms
  TOSH_period32 = 0x01, // 94ms
  TOSH_period64 = 0x02, // 0.19s
  TOSH_period128 = 0x03, // 0.38s
  TOSH_period256 = 0x04, // 0.75s
  TOSH_period512 = 0x05, // 1.5s
  TOSH_period1024 = 0x06, // 3.0s
  TOSH_period2048 = 0x07 // 6.0s
};

void TOSH_wait()
{
  asm volatile("nop");
  asm volatile("nop");
}

void TOSH_sleep()
{
  sbi(MCUCR, 5);
  //sbi(MCUCR, SE);
  asm volatile ("sleep");
}

/**
 * (Busy) wait <code>usec</code> microseconds
 */
inline void TOSH_uwait(uint16_t usec)
{
  /* In most cases (constant arg), the test is elided at compile-time */
  if (usec)
    /* loop takes 4 cycles, aka 1us */
    asm volatile (
"1:	sbiw	%0,1\n"
"	brne	1b" : "+r" (usec));
}

#endif //TOSH_AVRHARDWARE_H