#ifndef __LWIP_DEBUG_H__#define __LWIP_DEBUG_H__#include "arch/cc.h"#include "lwip/opt.h"/*add by sun */ /** lower two bits indicate debug level * - 0 off * - 1 warning * - 2 serious * - 3 severe */#define DBG_LEVEL_OFF     0        /*關閉打印*/ #define DBG_LEVEL_WARNING 1  /* bad checksums, dropped packets, ... */#define DBG_LEVEL_SERIOUS 2  /* memory allocation failures, ... */#define DBG_LEVEL_SEVERE  3  /*非常惡劣地 */ #define DBG_MASK_LEVEL    3/** flag for LWIP_DEBUGF to enable that debug message */#define DBG_ON  0x80U/** flag for LWIP_DEBUGF to disable that debug message */#define DBG_OFF 0x00U/** flag for LWIP_DEBUGF indicating a tracing message (to follow program flow) */#define DBG_TRACE   0x40U/** flag for LWIP_DEBUGF indicating a state debug message (to follow module states) */#define DBG_STATE   0x20U/** flag for LWIP_DEBUGF indicating newly added code, not thoroughly tested yet */#define DBG_FRESH   0x10U/** flag for LWIP_DEBUGF to halt after printing this debug message */#define DBG_HALT    0x08U/*如果y為0時，assert先向標準錯誤流steerr寫錯誤信息，然后使程序非正常中止 */ #ifndef LWIP_NOASSERT #define LWIP_ASSERT(x,y) do { if(!(y)) LWIP_PLATFORM_ASSERT(x); } while(0)#else#define LWIP_ASSERT(x,y) #endif#ifdef LWIP_DEBUG/** print debug message only if debug message type is enabled... *  AND is of correct type AND is at least DBG_LEVEL */#define LWIP_DEBUGF(debug,x)  do { if (((debug) & DBG_ON) && ((debug) & DBG_TYPES_ON) && ((s16_t)((debug) & DBG_MASK_LEVEL) >= DBG_MIN_LEVEL)) { LWIP_PLATFORM_DIAG(x); if ((debug) & DBG_HALT) while(1); } } while(0)#define LWIP_ERROR(x)   do { LWIP_PLATFORM_DIAG(x); } while(0)  #else /* LWIP_DEBUG */#define LWIP_DEBUGF(debug,x) #define LWIP_ERROR(x)  #endif /* LWIP_DEBUG */#endif /* __LWIP_DEBUG_H__ */