第三次实验串口实验

1、.第三次实验 串口实验一、实验报告内容：1、实验目的和内容；要求：通过串口0从PC机接收数据，再发给PC机显示出来，再结合流水灯显示。2、自己编写的程序；3、实验现象记录和相关截图；4、实验中出现问题和调试分析。二、实验任务：1. 看懂原理图的接口连接；2. 端口初始化函数Port_Init()，找到和串口相关的初始化语句，解释；3. 串口初始化函数Uart_Init(0,115200)，对其记录（截图，截和自己实验相关的串口），并进行注释；计算出波特率；4. 函数Uart_Select(0)是什么？解释清楚；5. 编写接收一个字节的函数aa= Uart_Getch()；对其进行详细的记录和解

2、释；6. 完成：如何发送一个字符？7. 画接收过程的流程图。三、实验步骤 1新建工程文件。 2定义与UART 有关的各个寄存器地址和一些特殊的位命令,加以解释。3编写串口驱动函数：4在主函数中实现将从串口0 接收到的数据发送到串口0（Main.c）: 实验参考程序：#include def.h#include option.h#include 2440addr.h #include 2440lib.h#include 2440slib.h #include #include /=#define rUTRSTAT0(*(volatile unsigned *)0x50000010)#define

3、 rUTRSTAT1(*(volatile unsigned *)0x50004010)#define WrUTXH0(ch)(*(volatile unsigned char *)0x50000020)=(unsigned char)(ch)#define WrUTXH1(ch)(*(volatile unsigned char *)0x50004020)=(unsigned char)(ch)#define RdURXH0()(*(volatile unsigned char *)0x50000024)#define RdURXH1()(*(volatile unsigned char *

4、)0x50004024)void Uart_Init(int mclk,int baud);void Uart_Select(int ch);void Uart_TxEmpty(int ch);char Uart_Getch(void);char Uart_GetKey(void);void Uart_GetString(char *string);int Uart_GetIntNum(void);void Uart_SendByte(int data);void Uart_SendString(char *pt);void Uart_Printf(char *fmt,.);void dely

5、(U32 tt) U32 i; for(;tt0;tt-) for(i=0;i10000;i+) int Main(int argc, char *argv) char c11; char err; U8 aa; ChangeMPllValue(68,1,1); Port_Init();Uart_Select(0);Uart_Init(0,115200); MMU_DisableICache(); MMU_DisableDCache(); while(1) aa= Uart_Getch(); Uart_SendByte(aa ); Uart_SendByte(10); switch(aa) c

6、ase a: Uart_Printf(nYou Pressed a); 点流水灯 break; case b: Uart_Printf(nYou Pressed b); 点流水灯 break; case c: Uart_Printf(nYou Pressed c); 点流水灯 break; default : break; return 0;/* MPLL *void ChangeMPllValue(int mdiv,int pdiv,int sdiv) rMPLLCON = (mdiv12) | (pdiv4) | sdiv; / 计算PCLK的大小？在下面的函数中那条语句完成了对串口用到的

7、端口的初始化？void Port_Init(void) rGPACON = 0x7fffff; rGPBCON = 0x015550; rGPBUP = 0x7ff; rGPCCON = 0xaaa956aa; rGPCUP = 0xffff; rGPDCON = 0xaaaaaaaa; rGPDUP = 0xffff; rGPECON = 0xa02aa800; rGPEUP = 0xffff; rGPFCON = 0x55aa; rGPFUP = 0xff; rGPGCON = 0x00a2aaaa; rGPGUP = 0xffff; rGPHCON = 0x00faaa; rGPHUP

8、= 0x7ff; rGPJCON = 0x02aaaaaa; rGPJUP = 0x1fff; /External interrupt will be falling edge triggered. rEXTINT0 = 0x22222222; rEXTINT1 = 0x22222222; rEXTINT2 = 0x22222222; void Uart_Select(int ch) whichUart = ch;逐条注释语句void Uart_Init(int pclk,int baud) int i; if(pclk = 0) pclk = 38000000; / pclk = PCLK; rUFCON0 = 0x0; rUFCON1 = 0x0; rUFCON2 = 0x0; rUMCON0 = 0x0; rUMCON1 = 0x0; /UART0 rULCON0 = 0x3; rUCON0 = 0x245; rUBRDIV0=( (int)(pclk/16./baud+0.5) -1 ); /UART1 rULCON1 = 0x3; rUCON1 = 0x245; rUBR