Xilinx FPGA中使用LCD1602的方法
来源：互联网 发布：淘宝客怎么做推广计划 编辑：程序博客网 时间：2024/06/04 05:33
一、XPS中的设置
1.在XPS添加一个XPS General Purpose IO，并将其命名为“Char_LCD”。
注：这里的命名有一定的规则，将其命名为“Char_LCD”，是因为在后来的C程序中调用LCD基地址的时候使用的名字为“XPAR_CHAR_LCD_BASEADDR”，如果将这个命名为其他的（比如XX），那么在下面的lcd.h中也要将
#define LCD_BASEADDR XPAR_CHAR_LCD_BASEADDR
这一句中的"CHAR_LCD"改成对应的名称。
2.配置Char_LCD中Channel 1的GPIO Data Channel Width为11并在Ports中设置为Connected to External Ports。
3.在System.ucf加入相应的管教约束，这里提供Genesys Digilent开发板中对应的管脚约束，管脚的名称自然而言和上面使用的名称对应。
#Char_LCD constraints#Char_LCD_GPIO_IO_pin<0> corresponds to LCD_E#Char_LCD_GPIO_IO_pin<1> corresponds to LCD_RS#Char_LCD_GPIO_IO_pin<2> corresponds to LCD_RW#Char_LCD_GPIO_IO_pin<3> corresponds to LCD_D7, <4> to LCD_D6... <10> to LCD_D0Net Char_LCD_GPIO_IO_pin<0> LOC = AA5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<1> LOC = V7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<2> LOC = W6 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<3> LOC = AD7 | IOSTANDARD=LVCMOS33 |TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<4> LOC = AC7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<5> LOC = AC5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<6> LOC = AB6 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<7> LOC = AC4 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<8> LOC = AB5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<9> LOC = AB7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;Net Char_LCD_GPIO_IO_pin<10> LOC = Y8 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN;
二、SDK中的代码模板
1.将lcd.h、lcd.c、sleep.h和sleep.c添加到工程的src文件夹中，并在需要调用LCD的代码中添加
#include "lcd.h"
2.在使用LCD之前需要进行初始化，添加下面代码：
LCDOff();LCDClear();LCDOn();LCDInit();
3.需要在LCD中显示时，调用下面函数
LCDPrintString(First_Line, Second_Line; //First_Line和Second_Line都是char*类型
附件：博文中提到文件的源代码：
1.lcd.h
/********************************************************************************* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"* SOLELY FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR* XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION* AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION* OR STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS* IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS* FOR A PARTICULAR PURPOSE.* * (c) Copyright 2007 Xilinx, Inc.* All rights reserved.*******************************************************************************/#ifndef LCD_H#define LCD_H//=====================//TEST FUNCTIONS//=====================void LCDTest();void LCDTestMenu();void LCDTestInput(char ch);//=====================//EXTERNAL FUNCTIONS//=====================#define LCD_BASEADDR XPAR_CHAR_LCD_BASEADDR //根据需要修改这里void LCDOn();void LCDOff();void LCDClear();void LCDInit();void LCDEnableDisplayShift();void LCDEnableCursorBlink();void LCDDisableDisplayShift();void LCDDisableCursorBlink();void MoveCursorHome();void MoveCursorRight();void MoveCursorLeft();void LCDSetLine(int line);void LCDPrintChar(char c);void LCDPrintString(char * line1, char * line2);//=====================//INTERNAL FUNCTIONS//=====================void InitInst(void);void WriteInst(unsigned long inst1, unsigned long inst2);void WriteData(unsigned long data1, unsigned long data2);void WriteInst8(unsigned long inst);void WriteData8(unsigned long data);#endif
2.lcd.c
/******************************************************************************** XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"* AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND* SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,* OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,* APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION* THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS* FOR A PARTICULAR PURPOSE.** (c) Copyright 2007 Xilinx Inc.* All rights reserved.*******************************************************************************/#include <stdio.h>#include "sleep.h"#include "xgpio_l.h"#include "xparameters.h"#include "lcd.h"// usec delay timer during initialization, important to change if// clock speed changes#define INIT_DELAY 10000 #define INST_DELAY 1000 //usec delay timer between instructions#define DATA_DELAY 1000 //usec delay timer between data/*#------------------------------------------------------------------------------# IO Pad Location Constraints / Properties for Character LCD GPIO#------------------------------------------------------------------------------Net Char_LCD_GPIO_IO<0> LOC = AA5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_ENet Char_LCD_GPIO_IO<1> LOC = V7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_RSNet Char_LCD_GPIO_IO<2> LOC = W6 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_RWNet Char_LCD_GPIO_IO<3> LOC = AD7 | IOSTANDARD=LVCMOS33 |TIG | PULLDOWN; #LCD_D7Net Char_LCD_GPIO_IO<4> LOC = AC7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D6Net Char_LCD_GPIO_IO<5> LOC = AC5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D5Net Char_LCD_GPIO_IO<6> LOC = AB6 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D4Net Char_LCD_GPIO_IO<7> LOC = AC4 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D3Net Char_LCD_GPIO_IO<8> LOC = AB5 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D2Net Char_LCD_GPIO_IO<9> LOC = AB7 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D1Net Char_LCD_GPIO_IO<10> LOC = Y8 | IOSTANDARD=LVCMOS33 | TIG | PULLDOWN; #LCD_D0*///==============================================================================////INTERNAL FUNCTIONS////==============================================================================void WaitForBusyFlag(void){Xuint32 LCD_Status;XGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF8FF);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100); usleep(10);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000500); usleep(10);LCD_Status = XGpio_mReadReg(LCD_BASEADDR, 1); usleep(10);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100); usleep(10);//xil_printf("\r\nLCD status = 0x%X", LCD_Status);while (LCD_Status & 0x00000080){XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100); usleep(10);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000500); usleep(10);LCD_Status = XGpio_mReadReg(LCD_BASEADDR, 1);//xil_printf("\r\nLCD status = 0x%X", LCD_Status);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100); usleep(10);}//set LCD data to output againXGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF800);}void InitInst(void){Xuint32 LCD_Status;/* 4-bit mode XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000003); //function set 4-bit mode, usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000043); //set enable and data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000003); usleep(INIT_DELAY);*/XGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF800); XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x0000003C);//function set, 8-bit mode, 2 lines, 8 X 11 dots usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x0000043C); //set enable and data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x0000003C);//read the Busy FlagXGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF8FF);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000500);LCD_Status = XGpio_mReadReg(LCD_BASEADDR, 1);//xil_printf("\r\nLCD status = 0x%X", LCD_Status);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100);while (LCD_Status & 0x00000080){XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000500);LCD_Status = XGpio_mReadReg(LCD_BASEADDR, 1);//xil_printf("\r\nLCD status = 0x%X", LCD_Status);XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000100);}//set LCD data to output againXGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF800);}//write instruction on 8 bitsvoid WriteInst8(unsigned long inst){ unsigned long printinst;XGpio_mSetDataDirection(LCD_BASEADDR, 1, 0xFFFFF800); printinst = 0x00000400 | inst; XGpio_mSetDataReg(LCD_BASEADDR, 1, inst); //write data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, printinst); //set enable usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, inst); //turn off enable usleep(10);WaitForBusyFlag();// usleep(INST_DELAY);}void WriteInst(unsigned long inst1, unsigned long inst2){ unsigned long printinst; printinst = 0x00000040 | inst1; XGpio_mSetDataReg(LCD_BASEADDR, 1, inst1); //write data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, printinst); //set enable usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, inst1); //turn off enable usleep(10); printinst = 0x00000040 | inst2; XGpio_mSetDataReg(LCD_BASEADDR, 1, printinst); //set enable and data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, inst2); //turn off enable usleep(INST_DELAY);}void WriteData8(unsigned long data){ unsigned long rs_data, enable_rs_data; //int busy=true; rs_data = 0x00000200 | data; //sets rs, data1 enable_rs_data = 0x00000600 | data; XGpio_mSetDataReg(LCD_BASEADDR, 1, rs_data); //write data, rs usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, enable_rs_data); //set enable, keep data, rs usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, rs_data); //turn off enable usleep(10);WaitForBusyFlag();// usleep(DATA_DELAY);}void WriteData(unsigned long data1, unsigned long data2){ unsigned long rs_data, enable_rs_data; //int busy=true; rs_data = 0x00000020 | data1; //sets rs, data1 enable_rs_data = 0x00000060 | data1; XGpio_mSetDataReg(LCD_BASEADDR, 1, rs_data); //write data, rs usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, enable_rs_data); //set enable, keep data, rs usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, rs_data); //turn off enable usleep(10); rs_data = 0x00000020 | data2; //sets rs, data2 enable_rs_data = 0x00000060 | data2; //sets rs, data2 XGpio_mSetDataReg(LCD_BASEADDR, 1, enable_rs_data); //set enable, rs, data usleep(10); XGpio_mSetDataReg(LCD_BASEADDR, 1, rs_data); //turn off enable usleep(DATA_DELAY);}//==================================================================================////EXTERNAL FUNCTIONS////==================================================================================void LCDOn(){ //printf("DISPLAY ON\r\n");// WriteInst(0x00000000, 0x0000000E); WriteInst8(0x0000000E); //display on, cursor on, cursor blink off}void LCDOff(){ // printf("DISPLAY OFF\r\n");// WriteInst(0x00000000, 0x00000008); WriteInst8(0x00000008); //display off, cursor off}void LCDClear(){ // printf("DISPLAY CLEAR\r\n");// WriteInst(0x00000000, 0x00000001);// WriteInst(0x00000000, 0x00000010); WriteInst8(0x00000001); //clear display WriteInst8(0x00000002); //return home}void LCDInit(){ // Sets CHAR LCD Reg to Write Mode XGpio_mSetDataDirection(LCD_BASEADDR, 1, 0x00000000); // Zeroes CHAR LCD Reg XGpio_mSetDataReg(LCD_BASEADDR, 1, 0x00000000); // LCD INIT usleep(15000); //After VCC>4.5V Wait 15ms to Init Char LCD InitInst(); usleep(4100); //Wait 4.1ms InitInst(); usleep(100); //Wait 100us InitInst(); InitInst(); // Function Set// WriteInst(0x00000002, 0x00000002);WriteInst8(0x00000038); // Display Off// WriteInst(0x00000000, 0x00000008);WriteInst8(0x00000008); // Display Clear// WriteInst(0x00000000, 0x00000001);WriteInst8(0x00000001); // Entry Mode Set// WriteInst(0x00000000, 0x00000006);WriteInst8(0x00000006); //cursor moves right, no shift // Display On// WriteInst(0x00000000, 0x0000000E); WriteInst8(0x0000000E);//display on, cursor on, cursor blink off}void LCDEnableDisplayShift(){WriteInst8(0x00000007); //cursor moves right, shift enabled}void LCDEnableCursorBlink(){WriteInst8(0x0000000F);//display on, cursor on, cursor blink on}void LCDDisableDisplayShift(){WriteInst8(0x00000006); //cursor moves right, no shift}void LCDDisableCursorBlink(){ WriteInst8(0x0000000E);//display on, cursor on, cursor blink off}void MoveCursorHome(){// WriteInst(0x00000000, 0x00000002); WriteInst8(0x00000002); }void MoveCursorLeft(){// WriteInst(0x00000001, 0x00000000);WriteInst8(0x00000010);}void MoveCursorRight(){// WriteInst(0x00000001, 0x00000004); WriteInst8(0x00000014); }void LCDSetLine(int line){ //line1 = 1, line2 = 2 int i; if((line - 1)) { MoveCursorHome(); for(i=0; i<40; i++) { MoveCursorRight(); } } else { MoveCursorHome(); }}void LCDPrintChar(char c){// WriteData(((c >> 4) & 0x0000000F), (c & 0x0000000F)); WriteData8(c);}void LCDPrintString(char * line1, char * line2){ int i=0; LCDSetLine(1); for(i=0; i<16; i++) { if(line1[i]) LCDPrintChar(line1[i]); else break; }i=0;//xil_printf ("\r\nFirst Line printed"); LCDSetLine(2);//WriteInst8(0x000000C0); for(i=0; i<16; i++) { if(line2[i]) LCDPrintChar(line2[i]); else break; }//xil_printf ("\r\nSecond Line printed"); return;}3.sleep.h
/********************************************************************************* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"* SOLELY FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR* XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION* AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION* OR STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS* IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS* FOR A PARTICULAR PURPOSE.* * (c) Copyright 2007 Xilinx, Inc.* All rights reserved.*******************************************************************************/#ifndef SLEEP_H#define SLEEP_Hvoid nanosleep(unsigned int nanoseconds);void usleep(unsigned int useconds);void sleep(unsigned int seconds);#endif
4.sleep.c
/******************************************************************************** XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"* AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND* SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,* OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,* APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION* THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS* FOR A PARTICULAR PURPOSE.** (c) Copyright 2007 Xilinx Inc.* All rights reserved.*******************************************************************************/#include "sleep.h"//#include "xtime_l.h"#include "xparameters.h"void nanosleep(unsigned int nanoseconds){ /* not implemented */}void usleep(unsigned int useconds){ int i,j; for (j=0;j<useconds;j++) for (i=0;i<26;i++) asm("nop");// XTime tEnd, tCur;// XTime_GetTime(&tCur);// tEnd = tCur + ((XTime) useconds) * (XPAR_CPU_PPC405_CORE_CLOCK_FREQ_HZ / 1000000);// do// {// XTime_GetTime(&tCur);// } while (tCur < tEnd);}void sleep(unsigned int seconds){ int i,j; for (j=0;j<seconds;j++) for (i=0;i<25000000;i++) asm("nop");// XTime tEnd, tCur;// XTime_GetTime(&tCur);// tEnd = tCur + ((XTime) seconds) * XPAR_CPU_PPC405_CORE_CLOCK_FREQ_HZ;// do// {// XTime_GetTime(&tCur);// } while (tCur < tEnd);} 0 0
- Xilinx FPGA中使用LCD1602的方法
- Xilinx FPGA器件中时钟资源的说明以及使用
- 基于FPGA的LCD1602驱动
- xilinx的FPGA竞赛
- xilinx FPGA的结构
- Xilinx FPGA的配置
- Xilinx FPGA的配置
- 赛灵思（XILINX） FPGA中VRP/VRN管脚的使用心得
- Xilinx FPGA中使用PicoBlaze处理器软核
- Xilinx的FPGA在使用DCM时的问题解决方案
- Xilinx FPGA ChipScope的ICON/ILA/VIO核使用
- Xilinx FPGA ChipScope的ICON/ILA/VIO核使用
- Xilinx FPGA ChipScope的ICON/ILA/VIO核使用
- XILINX的FPGA的资源
- Xilinx 中时钟的使用
- Xilinx的FPGA命名规则
- xilinx的FPGA命名规则
- Xilinx FPGA 的PCIE 设计
- Web页面渲染及合成加速（二）
- CSS3 transition 属性过渡效果 详解
- TOMCAT整合APR
- FICO入门一句话
- linux下卸载安装jdk
- Xilinx FPGA中使用LCD1602的方法
- MySQL(基础篇)之MySQL(时间和日期函数)
- Android 4.0 硬件加速纹理渲染过程
- 如何写论文创新点
- SQL Server查询性能调优、捕捉和评估查询性能
- c#打开和关闭外部程序
- jQuery学习笔记
- 实用的一些博客
- 小强的HTML5移动开发之路（9）——坦克大战游戏3
