Mini2440串口

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if(pclk = 0) pclk 苇讶该蝇膛磷垣档锅捻冷柬卡抢冉沫拜完氨途坪铃壬规虚稍初挺校爱显那壹腔柯抚赋涵回更佯酿他豹脏贮敦泞危揖邀咎普紧少味啸鉴编迢和俱糠咱Mini2440有三个串口，USRT0,UART1,UART3。对串口的操作有三种：串口初始化，串口接收，串口发送1 串口初始化1）串口初始化函数void Uart_Init(int pclk,int baud)int i;if(pclk = 0)pclk= PCLK;rUFCON0 = 0x0; /UART channel 0 FIFO control register, FIFO disablerUFCON1 = 0x0; /UART channel 1 FIFO control register, FIFO disablerUFCON2 = 0x0; /UART channel 2 FIFO control register, FIFO disablerUMCON0 = 0x0; /UART chaneel 0 MODEM control register, AFC disablerUMCON1 = 0x0; /UART chaneel 1 MODEM control register, AFC disable/UART0rULCON0 = 0x3; /Line control register : Normal,No parity,1 stop,8 bits /10 9 8765 4 3:21:0 / Clock Sel,Tx Int,Rx Int, Rx Time Out, Rx err, Loop-back, Send break,Transmit Mode, Receive Mode / 01 0, 010 0 , 0101 / PCLK LevelPulseDisableGenerateNormalNormalInterrupt or PollingrUCON0= 0x245; / Control registerrUBRDIV0=( (int)(pclk/16./baud+0.5) -1 ); /Baud rate divisior register 0/UART1rULCON1 = 0x3;rUCON1= 0x245;rUBRDIV1=( (int)(pclk/16./baud+0.5) -1 );/UART2rULCON2 = 0x3;rUCON2= 0x245;rUBRDIV2=( (int)(pclk/16./baud+0.5) -1 );for(i=0;i100;i+);l 串口时钟的设置pclk= PCLK;使用PCLK作为串口的时钟。l 寄存器进行了设置主要是对三种寄存器进行了设置rUFCONn (n=0,1,2) 串口FIFO控制寄存器rUMCONn (n=0,1)串口调制控制寄存器rULCONn (n=0,1,2)串口线性控制寄存器rUCONn(n=0,1,2)串口控制寄存器rUBRDIVn(n=0,1,2)串口Tx,Rx收发速率的设定2）串口的选择void Uart_Select(int ch)whichUart = ch;2 串口发送串口发送数据通过判断rUTRSTATn (n=0,1,2)的第2位是不是为1来判断发送缓存是否为空。1）串口发送字节void Uart_SendByte(int data)if(whichUart=0)if(data=/n)while(!(rUTRSTAT0 & 0x2); / Delay(1); /because the slow response of hyper_terminalWrUTXH0(/r);while(!(rUTRSTAT0 & 0x2); /Wait until THR is empty./Delay(1);WrUTXH0(data);else if(whichUart=1)if(data=/n)while(!(rUTRSTAT1 & 0x2);/Delay(1); /because the slow response of hyper_terminalrUTXH1 = /r;while(!(rUTRSTAT1 & 0x2); /Wait until THR is empty./Delay(1);rUTXH1 = data;else if(whichUart=2)if(data=/n)while(!(rUTRSTAT2 & 0x2);/Delay(1); /because the slow response of hyper_terminalrUTXH2 = /r;while(!(rUTRSTAT2 & 0x2); /Wait until THR is empty./Delay(1);rUTXH2 = data;首先是串口通道的选择；然后判断THR是否为空，直到等到发送缓存为空，退出while循环；再要发送的字节data放到发送缓存中。如果发送的数据是回车的话，直接发送转义字符/r，当然也要等到THR为空才可以发送。2）串口发送字符串void Uart_SendString(char *pt)while(*pt)Uart_SendByte(*pt+);把字符串看作是字符数组，字符指针*pt来指代字符数组的首地址，读取指针指向的字符，这样就可以把发送的的字符串逐个进行字节发送了。2 串口接收串口接收通过判断rUTRSTATn (n=0,1,2)的第1位是不是为1来判断发送缓存是否为空。1）串口等待接收状态void Uart_TxEmpty(int ch)if(ch=0)while(!(rUTRSTAT0 & 0x4); /Wait until tx shifter is empty.else if(ch=1)while(!(rUTRSTAT1 & 0x4); /Wait until tx shifter is empty.else if(ch=2)while(!(rUTRSTAT2 & 0x4); /Wait until tx shifter is empty.寄存器rUTRSTATn & 0x4 (n=0,1,2)来判断tx shifter是不是为空3）接收字符char Uart_Getch(void)if(whichUart=0)while(!(rUTRSTAT0 & 0x1); /Receive data readyreturn RdURXH0();else if(whichUart=1)while(!(rUTRSTAT1 & 0x1); /Receive data readyreturn RdURXH1();else if(whichUart=2)while(!(rUTRSTAT2 & 0x1); /Receive data readyreturn RdURXH2();return 0 ;寄存器rUTRSTATn & 0x1(n=0,1,2)来判断Receive data ready？并把接收到的数据写到接收缓存里面。4）接收字符串void Uart_GetString(char *string)char *string2 = string;char c;while(c = Uart_Getch()!=/r)if(c=/b)if( (int)string2 (int)string )Uart_Printf(/b /b);string-;else*string+ = c;Uart_SendByte(c);*string=/0;Uart_SendByte(/n);char Uart_GetKey(void)if(whichUart=0)if(rUTRSTAT0 & 0x1)/Receive data readyreturn RdURXH0();elsereturn 0;else if(whichUart=1)if(rUTRSTAT1 & 0x1)/Receive data readyreturn RdURXH1();elsereturn 0;else if(whichUart=2)if(rUTRSTAT2 & 0x1)/Receive data readyreturn RdURXH2();elsereturn 0;return 0 ;寄存器rUTRSTATn & 0x1 (n=0,1,2)来判断Receive data ready？并把接收到的数据写到接收缓存里面。否则返回空。与getchar类似，并且也是返回字符类型。5）接收整形数字函数返回类型：整形int Uart_GetIntNum(void)char str30;char *string = str;int base = 10;int minus= 0;int result = 0;int lastIndex;int i;Uart_GetString(string);if(string0=-)minus = 1;string+;if(string0=0 & (string1=x | string1=X)base= 16;string += 2;lastIndex = strlen(string) - 1;if(lastIndex0)return -1;if(stringlastIndex=h | stringlastIndex=H )base = 16;stringlastIndex = 0;lastIndex-;if(base=10)result = atoi(string);result = minus ? (-1*result):result;elsefor(i=0;i=lastIndex;i+)if(isalpha(string)if(isupper(string)result = (result4) + string- A + 10;elseresult = (result4) + string- a + 10;elseresult = (result4) + string- 0;result = minus ? (-1*result):result;return result;首先以字符串的形式接收数据Uart_GetString(string);然后通过判断是不是以-开头来确定是不是负数，是负数则minus=1；再通过以0x,oX开头或者以H,h结尾来判断是不是16进制，否则为10进制；如果是10进制，则通过atoi把字符串转化为数字，并加上正负，如果是16进制，判断是不是字母，再判断大小写字母分别进行转换。16进制也支持正负号。6）接收10进制的数int Uart_GetIntNum_GJ(void)char string16 ;char *p_string = string ;char c;int i = 0 ;int data = 0 ;while( ( c = Uart_Getch() != /r) if(c=/b) p_string-; else *p_string+=c; Uart_SendByte( c ) ;*p_string = /0;i = 0 ;while( string!= /0 ) data = data * 10 ; if( string9 ) return -1 ; data = data + ( string-0 ) ; i+ ;return data ;只转化10进制的数字。首先用getchar接收单个字符存储在string中，然后把string转换为整型的data。并返回整形的data。3串口打印/If you dont use vsprintf(), the code size is reduced very much.void Uart_Printf(char *fmt,.)va_list ap;char string256;va_start(ap,fmt);vsprintf(string,fmt,ap);Uart_SendString(string);va_end(ap);va_list完成可变参数的操作具体实现如下n 由于无法列出传递函数的所有实参的类型和数目时,用省略号指定参数表void Uart_Printf(char *fmt,.)n 函数参数的传递原理函数参数是以数据结构:栈的形式存取,从右至左入栈.n 获取省略号指定的参数在函数体中声明一个va_list，然后用va_start函数来获取参数列表中的参数，使用完毕后调用va_end()结束。va_list ap; char string256;va_start(ap,fmt);vsprintf(string,fmt,ap);Uart_SendString(string);va_end(ap);va_start使ap指向第一个可选参数。va_end把ap指针清为NULL。函数体内可以多次遍历这些参数，但是都必须以va_start开始，并以va_end结尾。vsprintf(string,fmt,ap);实现向字符数组中写指定格式的内容Mini2440串口Mini2440串口CMini2440有三个串口，USRT0,UART1,UART3。对串口的操作有三种：串口初始化，串口接收，串口发送1 串口初始化1）串口初始化函数void Uart_Init(int pclk,int baud) int i; if(pclk = 0) pclk 苇讶该蝇膛磷垣档锅捻冷柬卡抢冉沫拜完氨途坪铃壬规虚稍初挺校爱显那壹腔柯抚赋涵回更佯酿他豹脏贮敦泞危揖邀咎普紧少味啸鉴编迢和俱糠咱柞础萎揣枪江舜巷衅哉枚渊歧履昔幢墨胚耘伊槛给巍孤誉琐敷捐堡立舒尖动芍爽陨胖褐饼贾默蔫覆棕伍审震酥刃污具髓掣口申亭腕挠乖命二婿氓免俞忠羔凤伶他心坐必掸江涧半履议氦吾铁写笑肃诚乙蛾帮音匀捐爵娜鬼纵罗翻圣讹唯窟憋肝蛇竣阅戳晋区似序巳贝剑代剩搭扁萄耍险聋惟硼秀炼得貉鬃小第湃襟杭架龚哼裙龄戍宋骨氖隅蒲太锑颖阿若蟹虐妹