20151208-5：print.h和timer

一、print.h （xc）

函数名	描述
int printchar(char value)	Prints a character. return The number of characters printed, or -1 on error.
int printcharln(char value	Prints a character followed by a new line.
int printint(int value)	Prints a value as a signed decimal.
int printintln(int value)	Prints a value as a signed decimal followed by a newline.
int printuint(unsigned value)	Prints a value as a unsigned decimal
int printuintln(unsigned value)	Prints a value as a unsigned decimal followed by a newline
int printllong(long long value)	Prints a long long value as a signed decimal.
int printllongln(long long value)	Prints a long long value as a signed decimal followed by a newline
int printullong(unsigned long long value)	Prints a long long value as a unsigned decimal
int printullongln(unsigned long long value)	Prints a long long value as a unsigned decimal followed by a newline
int printhex(unsigned value)	Prints a value as a unsigned hexadecimal.The upper-case letters \p ABCDEF are used for the conversion.
int printhexln(unsigned value);	Prints a value as a unsigned hexadecimal followed by a newline.The upper-case letters \p ABCDEF are used for the conversion.
int printllonghex(unsigned long long value);	Prints a long long value as a unsigned hexadecimal. The upper-case letters \p ABCDEF are used for the conversion.
int printllonghexln(unsigned long long value);	Prints a long long value as a unsigned hexadecimal followed by a newline.The upper-case letters \p ABCDEF are used for the conversion.
int printbin(unsigned value);	Prints a value as an unsigned binary number.
int printbinln(unsigned value);	Prints a value as an unsigned binary number followed by a newline.
printstr(const char (& alias s)[])	Prints a null terminated string.

二、timer.h延时函数及timerafter写的延时功能块

函数名	描述
void delay_ticks(unsigned ticks);	Pause the calling task for the specified number of reference clock ticks.
void delay_ticks_longlong(unsigned long long ticks);	Pause the calling task for the specified number of reference clock ticks
inline void delay_seconds(unsigned int delay)	Pause the calling task for the specified number of seconds.
inline void delay_milliseconds(unsigned delay)	Pause the calling task for the specified number of milliseconds.
inline void delay_microseconds(unsigned delay)	Pause the calling task for the specified number of microseconds.

三、用print跟踪app_usb_aud_xk_216_mc项目

在audio()函数前加入print语句，如果没有打开XScope下的Real-Time mode，那么运行时不能在console上看到打印信息。而打开Read-Time XScope mode后，在可以在console上看到打印信息

 thread_speed();              
    printstrln("audio");             //print语句加在这儿              
    audio(AUDIO_CHANNEL,     

clip_image002.jpg

原因可能是因为并行机制、实时性强导致打印语句不能很好得到执行。普通情况下打印语句是费时操作，而在xscope模式下，print机制已经与普通的print机制不同。在文档xTIMEcomposer user guide的第25部分Debug with printf in real-time中有说明。