华北电力大学科技学院ARM课内实验四

1、科 技 学 院课程设计报告( 2015 - 2016年度第 二 学期)名 称：ARM试验UART 题 目： 院 系： 科 技 学 院 班 级： 13k2 学 号：31 学生姓名： 指导教师： 张老师 设计周数： 成 绩： 日期：2016年 5月 10 日实验四：（1）UART0-4一：实验现象1. 本次实验是使用LPC178/177x系列Cortex-M3中的通用异步收发器UART0-4，短接P0.2和TXD0、P0.3和RXD0，通过串口0-4发送缓冲器中的数据，通过串口调试软件可以观察到发送的数据（16进制格式）。由于UART中的uart.c文件已经对UART0-4的管脚接口都已设置好，所

2、以我们无需在对其进行设置，只需用杜邦线连接各管脚和TXD0、RXD0，就可观察现象。所以这里只写出UART0的，其余的和UART0的一样。2. 现象如下图所示：UART0UART1：总共有64个数据。(由BUFSIZE的值可得出)。二：实验代码分析（1）uart.c文件部分此部分为UART的设置部分，因此所有的UART实验都有，所以后面实验就不在给出解释。首先我们要知道UART的基本设置流程。下面几张图说明：代码如下：#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include uart.hvolatile uin

3、t32_t UART0Status, UART1Status;volatile uint32_t UART2Status, UART3Status;volatile uint32_t UART4Status;volatile uint8_t UART0TxEmpty = 1, UART1TxEmpty = 1;volatile uint8_t UART2TxEmpty = 1, UART3TxEmpty = 1;volatile uint8_t UART4TxEmpty = 1;volatile uint8_t UART0BufferBUFSIZE, UART1BufferBUFSIZE;vo

4、latile uint8_t UART2BufferBUFSIZE, UART3BufferBUFSIZE;volatile uint8_t UART4BufferBUFSIZE;volatile uint32_t UART0Count = 0, UART1Count = 0;volatile uint32_t UART2Count = 0, UART3Count = 0;volatile uint32_t UART4Count = 0;UART0-4的中断处理函数（以UART0为例，1-4只需改变0为对应的数字即可）void UART0_IRQHandler (void) uint8_t u

5、iIIRValue = 0, uiLSRValue = 0; uint8_t uiDummy = uiDummy; uiIIRValue = LPC_UART0-IIR; uiIIRValue = 1; /中断标志寄存器值右移1位 uiIIRValue &= 0x07; if ( uiIIRValue = IIR_RLS ) /接收线状态中断 uiLSRValue = LPC_UART0-LSR; / 读取接收线状态寄存器 溢出中断、奇偶中断、帧中断、UART RBR中包含错误数据和帧间隔中断处理 if ( uiLSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE

6、|LSR_BI) ) UART0Status = uiLSRValue; uiDummy = LPC_UART0-RBR; return; if ( uiLSRValue & LSR_RDR ) /接收FIFO不为空中断 UART0BufferUART0Count = LPC_UART0-RBR; UART0Count+; if ( UART0Count = BUFSIZE ) UART0Count = 0; else if ( uiIIRValue = IIR_RDA ) /接收数据可用中断 UART0BufferUART0Count = LPC_UART0-RBR; UART0Count+

7、; if ( UART0Count = BUFSIZE ) UART0Count = 0; else if ( uiIIRValue = IIR_CTI ) /字符超时中断 UART0Status |= 0x100; else if ( uiIIRValue = IIR_THRE ) /发送保持寄存器空中断 uiLSRValue = LPC_UART0-LSR; if ( uiLSRValue & LSR_THRE ) UART0TxEmpty = 1; else UART0TxEmpty = 0; UART0-4端口引脚初始化函数uint32_t UARTInit( uint32_t Por

8、tNum) if ( PortNum = 0 ) LPC_SC-PCONP |= 0x00000008; #if 0 LPC_IOCON-P0_0 &= 0x07; LPC_IOCON-P0_0 |= 4; /P0.0为U0_TXD LPC_IOCON-P0_1 &= 0x07; LPC_IOCON-P0_1 |= 4; /P0.1为U0_RXD #endif #if 1 LPC_IOCON-P0_2 &= 0x07; LPC_IOCON-P0_2 |= 1; / P0.2为U0_TXD LPC_IOCON-P0_3 &= 0x07; LPC_IOCON-P0_3 |= 1; / P0.3为U

9、0_RXD #endif使能接收FIFO不为空中断、发送保持寄存器空中断、接收线状态中断 LPC_UART0-IER = IER_RBR | IER_THRE | IER_RLS;8为数据位，无奇偶检验位，1位停止位 LPC_UART0-LCR = 0x83; /锁定除数访问 LPC_UART0-FCR = 0x07; /使能并复位FIFO NVIC_EnableIRQ(UART0_IRQn); return (TRUE); else if ( PortNum = 1 ) LPC_SC-PCONP |= 0x00000010; #if 0 LPC_IOCON-P0_15 &= 0x07; LP

10、C_IOCON-P0_15 |= 1; /P0.15为U1_TXD LPC_IOCON-P0_16 &= 0x07; LPC_IOCON-P0_16 |= 1; / P0.16为U1_RXD #endif #if 1 LPC_IOCON-P3_16 &= 0x07; LPC_IOCON-P3_16 |= 3; /P3.16为U1_TXD LPC_IOCON-P3_17 &= 0x07; LPC_IOCON-P3_17 |= 3; /P3.17为U1_RXD #endif #if 0 LPC_IOCON-P2_0 &= 0x07; LPC_IOCON-P2_0 |= 2; /P2.0为U1_TX

11、D LPC_IOCON-P2_1 &= 0x07; LPC_IOCON-P2_1 |= 2; /P2.1为U1_TXD #endif 使能接收FIFO不为空中断、发送保持寄存器空中断、接收线状态中断 LPC_UART1-IER = IER_RBR | IER_THRE | IER_RLS; 8为数据位，无奇偶检验位，1位停止位 LPC_UART1-LCR = 0x83; LPC_UART1-FCR = 0x07; /使能并复位FIFO NVIC_EnableIRQ(UART1_IRQn); return (TRUE); else if ( PortNum = 2 ) LPC_SC-PCONP

12、|= 0x01000000; #if 1 LPC_IOCON-P0_10 &= 0x07; LPC_IOCON-P0_10 |= 1; /P0.10为U2_TXD LPC_IOCON-P0_11 &= 0x07; LPC_IOCON-P0_11 |= 1; /P0.11为U2_RXD #endif #if 0 LPC_IOCON-P4_22 &= 0x07; LPC_IOCON-P4_22 |= 2; /P4.22为U2_TXD LPC_IOCON-P4_23 &= 0x07; LPC_IOCON-P4_23 |= 2; /P4.23为U2_RXD #endif #if 0 LPC_IOCON

13、-P2_8 &= 0x07; LPC_IOCON-P2_8 |= 2; / P2.8为U2_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 2; /P2.9为U2_RXD #endif 使能接收FIFO不为空中断、发送保持寄存器空中断、接收线状态中断 LPC_UART2-IER = IER_RBR | IER_THRE | IER_RLS; 8为数据位，无奇偶检验位，1位停止位 LPC_UART2-LCR = 0x83; LPC_UART2-FCR = 0x07; /使能并复位FIFO NVIC_EnableIRQ(UART2_IRQn); retu

14、rn (TRUE); else if ( PortNum = 3 ) LPC_SC-PCONP |= 0x02000000; #if 0 LPC_IOCON-P0_25 &= 0x07; LPC_IOCON-P0_25 |= 3; / P0.25为U3_TXD LPC_IOCON-P0_26 &= 0x07; LPC_IOCON-P0_26 |= 3; /P0.26为U3_RXD #endif #if 0 LPC_IOCON-P0_0 &= 0x07; LPC_IOCON-P0_0 |= 2; /P0.0为U3_TXD LPC_IOCON-P0_1 &= 0x07; LPC_IOCON-P0_

15、1 |= 2; /P0.1为U3_RXD #endif #if 1 LPC_IOCON-P4_28 &= 0x07; LPC_IOCON-P4_28 |= 2; /P4.28为U3_TXD LPC_IOCON-P4_29 &= 0x07; LPC_IOCON-P4_29 |= 2; / P4.29为U3_RXD #endif #if 0 LPC_IOCON-P0_2 &= 0x07; LPC_IOCON-P0_2 |= 2; /P0.2为U3_TXD LPC_IOCON-P0_3 &= 0x07; LPC_IOCON-P0_3 |= 2; / P0.3为U3_RXD #endif 使能接收FI

16、FO不为空中断、发送保持寄存器空中断、接收线状态中断 LPC_UART3-IER = IER_RBR | IER_THRE | IER_RLS; 8为数据位，无奇偶检验位，1位停止位 LPC_UART3-LCR = 0x83; LPC_UART3-FCR = 0x07; /使能并复位FIFO NVIC_EnableIRQ(UART3_IRQn); return (TRUE); else if ( PortNum = 4 ) LPC_SC-PCONP |= 0x00000100; #if 0 LPC_IOCON-P0_22 &= 0x07; LPC_IOCON-P0_22 |= 3; /P0.2

17、2为U4_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 3; /P2.9为U4_RXD #endif #if 1 LPC_IOCON-P1_29 &= 0x07; LPC_IOCON-P1_29 |= 5; /P1.29为U4_TXD LPC_IOCON-P2_9 &= 0x07; LPC_IOCON-P2_9 |= 3; /P2.9为U4_RXD #endif #if 0 LPC_IOCON-P5_4 &= 0x07; LPC_IOCON-P5_4 |= 4; / P5.4为U4_TXD LPC_IOCON-P5_3 &= 0x07; LPC_I

18、OCON-P5_3 |= 4; /P5.3为U4_RXD #endif 使能接收FIFO不为空中断、发送保持寄存器空中断、接收线状态中断 LPC_UART4-IER = IER_RBR | IER_THRE | IER_RLS; 8为数据位，无奇偶检验位，1位停止位 LPC_UART4-LCR = 0x83; LPC_UART4-FCR = 0x07; /* 使能并复位FIFO */ NVIC_EnableIRQ(UART4_IRQn); return (TRUE); return( FALSE );UART0-4串口发送数据初始化void UARTSend( uint32_t portNum

19、, uint8_t *BufferPtr, uint32_t Length ) if ( portNum = 0 ) while ( Length != 0 ) while ( !(UART0TxEmpty & 0x01) ); / 等待发送标志为1 LPC_UART0-THR = *BufferPtr; /发送标志清0 BufferPtr+; / 指针后移 Length-; /发送数目减1 else if ( portNum = 1 ) while ( Length != 0 ) while ( !(UART1TxEmpty & 0x01) ); /等待发送标志为1 LPC_UART1-TH

20、R = *BufferPtr; /发送数据 UART1TxEmpty = 0; /发送标志清0 BufferPtr+; /指针后移 Length-; /发送数目减1 else if ( portNum = 2 ) while ( Length != 0 ) while ( !(UART2TxEmpty & 0x01) ); /等待发送标志为1 LPC_UART2-THR = *BufferPtr; /发送数据 UART2TxEmpty = 0; /发送标志清0 BufferPtr+; /指针后移 Length-; /发送数目减1 else if ( portNum = 3 ) while (

21、Length != 0 ) while ( !(UART3TxEmpty & 0x01) ); / 等待发送标志为1 LPC_UART3-THR = *BufferPtr; /发送数据 UART3TxEmpty = 0; /发送标志清0 BufferPtr+; /指针后移 Length-; /发送数目减1 else if ( portNum = 4 ) while ( Length != 0 ) while ( !(UART4TxEmpty & 0x01) ); /等待发送标志为1 LPC_UART4-THR = *BufferPtr; /发送数据 UART4TxEmpty = 0; /发送标

22、志清0 BufferPtr+; /指针后移 Length-; /发送数目减1 return;(2)主函数部分#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include ./UART/uart.hextern volatile uint32_t UART0Count;extern volatile uint8_t UART0BufferBUFSIZE;extern volatile uint32_t UART1Count;extern volatile uint8_t UART1BufferBUFSIZE;exte

23、rn volatile uint32_t UART2Count;extern volatile uint8_t UART2BufferBUFSIZE;extern volatile uint32_t UART3Count;extern volatile uint8_t UART3BufferBUFSIZE;extern volatile uint32_t UART4Count;extern volatile uint8_t UART4BufferBUFSIZE;void dataInit (uint32_t uiLocation) /UART0-4发送数据初始化子函数 uint32_t i =

24、 0; switch (uiLocation) case 0: for (i = 0; i BUFSIZE; i+) UART0Bufferi = i; UART0Count+; break; case 1: for (i = 0; i BUFSIZE; i+) UART1Bufferi = i; UART1Count+; break; case 2: for (i = 0; i BUFSIZE; i+) UART2Bufferi = i; UART2Count+; break; case 3: for (i = 0; i BUFSIZE; i+) UART3Bufferi = i; UART

25、3Count+; break; case 4: for (i = 0; i IER = IER_THRE | IER_RLS; UARTSend( 0, (uint8_t *)UART0Buffer, UART0Count ); LPC_UART0-IER = IER_THRE | IER_RLS | IER_RBR; break; case 1: LPC_UART1-IER = IER_THRE | IER_RLS; UARTSend( 1, (uint8_t *)UART1Buffer, UART1Count ); LPC_UART1-IER = IER_THRE | IER_RLS |

26、IER_RBR; break; case 2: LPC_UART2-IER = IER_THRE | IER_RLS; UARTSend( 2, (uint8_t *)UART2Buffer, UART2Count ); LPC_UART2-IER = IER_THRE | IER_RLS | IER_RBR; break; case 3: LPC_UART3-IER = IER_THRE | IER_RLS; UARTSend( 3, (uint8_t *)UART3Buffer, UART3Count ); LPC_UART3-IER = IER_THRE | IER_RLS | IER_

27、RBR; break; case 4: LPC_UART4-IER = IER_THRE | IER_RLS; UARTSend( 4, (uint8_t *)UART4Buffer, UART4Count ); LPC_UART4-IER = IER_THRE | IER_RLS | IER_RBR; break; while (1) int main (void) SystemInit(); UARTInit(0, 9600); /初始化串口0 dataInit(0); /初始化串口0的发送数据 dataSend(0); /通过串口0发送数据 三：通过修改某些语句从而使得串口信息发生变化U

28、ART0-4的试验现象都是只发送一次数据，所以在串口调试助手里只能看到一次数据，所以可以修改主函数中的某些语句就可使得数据循环发送，但是在实验验证修改是否正确时，不知道为什么还是只发送一次，但理论上是可以循环发送的。（2）UART自动波特率一：实验现象1. 本次实验是使用LPC178/177x系列Cortex-M3中的通用异步收发器中的自动波特率的设置，短接TXD0和P0.2、RXD0和P0.3，通过串口调试助手发送字符a或A，ARM将自动测到波特率，并将波特率发送到串口调试软件中，也就是ARM先自动匹配出波特率的值，并将匹配的值在发送到串口调试助手窗口中显示，注意：如果误差较大，可调节锁相环

29、倍频值和外设分频值。2. 现象如下图所示：二：实验代码分析#include ./LPC177x_8x/LPC177x_8x.h#include ./LPC177x_8x/type.h#include ./UART/uart.h#include stdio.h#include string.hvoid AutoBaud(void) char cStr64; uint32_t uiBand = 0; uint16_t uiDlm = 0; uint16_t uiDll = uiDll = 0; LPC_UART0-ACR = 0x01; /允许自动波特率 while (LPC_UART0-ACR & 0x01) != 0x0); /等待自动波特率测量完成 测量结束 LPC_UART0-ACR |= 0x01 IER &= (0x01 LCR = 0x83; /DLAB=1 uiDlm = (uint16_t)LPC_UART0-DLM; uiDll = (u