基于C语言实现PCF8591 DA转换实验(含源代码+使用说明).zip

#include <reg52.h> #include <intrins.h> #include <string.h> #define uchar unsigned char #define uint unsigned int #define disdata P0 //显示数据码输出口 bit flag; sbit SCL=P3^4; // 将p1.0口模拟时钟口 sbit SDA=P3^5; // 将p1.3口模拟数据口 sbit LCD_RS = P2^0; sbit LCD_RW = P2^1; sbit LCD_EN = P2^2; sbit K1 = P1^4; sbit K2 = P1^5; //选择健 sbit K3 = P1^6; //启动健 sbit K4 = P1^7; //停止健 sbit BEEP = P3^6; //蜂鸣器 uchar code dis1[] = {" PCF-8591 "}; uchar code dis2[] = {" DA CONVERTER "}; uchar code dis3[] = {" K2: D/A CHOOSE "}; uchar code dis4[] = {"K3:ENTER K4:EXIT"}; uchar code dis5[] = {" SINE WAVE "}; uchar code dis6[] = {" SQUARE WAVE "}; uchar code dis7[] = {" TRIANGLE WAVE "}; uchar code dis8[] = {" SAWTOOTH WAVE "}; bit out1=0,out2=0,out3=0,out4=0,START=0; #define delayNOP(); {_nop_();_nop_();_nop_();_nop_();}; bit bdata SystemError; //从机错误标志位 uchar N=0x00,k_count; /*********************** PCF8591专用变量定义 ***********************/ #define PCF8591_WRITE 0x90 #define PCF8591_READ 0x91 #define NUM 4 //接收和发送缓存区的深度 uchar idata receivebuf[NUM]; //数据接收缓冲区 uchar code sin_tab[] = //正弦波输出表 { 0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE, 0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8, 0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5, 0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6, 0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA, 0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1, 0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80, 0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51, 0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27, 0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A, 0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09, 0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25, 0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E, 0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E }; /*******************************************************************/ /* */ /* 延时函数 */ /* */ /*******************************************************************/ void delayB(uchar x) //x*0.14MS { uchar i; while(x--) { for (i=0; i<13; i++) { } } } /*******************************************************************/ /* */ /* 延时函数 */ /* */ /*******************************************************************/ void delay(int ms) { while(ms--) { uchar i; for(i=0;i<250;i++) { _nop_(); _nop_(); _nop_(); _nop_(); } } } /*******************************************************************/ /* */ /* 蜂鸣器函数 */ /* */ /*******************************************************************/ void beep() { uchar j; for (j=0;j<180;j++) { delayB(5); BEEP=!BEEP; //BEEP取反 } BEEP=1; //关闭蜂鸣器 delay(100); } /*******************************************************************/ /* */ /*检查LCD忙状态 */ /*lcd_busy为1时，忙，等待。lcd-busy为0时,闲，可写指令与数据。 */ /* */ /*******************************************************************/ bit lcd_busy() { bit result; LCD_RS = 0; LCD_RW = 1; LCD_EN = 1; delayNOP(); result = (bit)(P0&0x80); LCD_EN = 0; return(result); } /*******************************************************************/ /* */ /*写指令数据到LCD */ /*RS=L，RW=L，E=高脉冲，D0-D7=指令码。 */ /* */ /*******************************************************************/ void lcd_wcmd(uchar cmd) { while(lcd_busy()); LCD_RS = 0; LCD_RW = 0; LCD_EN = 0; _nop_(); _nop_(); P0 = cmd; delayNOP(); LCD_EN = 1; delayNOP(); LCD_EN = 0; } /*******************************************************************/ /* */ /*写显示数据到LCD */ /*RS=H，RW=L，E=高脉冲，D0-D7=数据。 */ /* */ /*******************************************************************/ void lcd_wdat(uchar dat) { while(lcd_busy()); LCD_RS = 1; LCD_RW = 0; LCD_EN = 0; P0 = dat; delayNOP(); LCD_EN = 1; delayNOP(); LCD_EN = 0; } /*******************************************************************/ /* */ /* LCD初始化设定 */ /* */ /*******************************************************************/ void lcd_init() { delay(15); lcd_wcmd(0x38); //16*2显示，5*7点阵，8位数据 delay(5); lcd_wcmd(0x38); delay(5); lcd_wcmd(0x38); delay(5); lcd_wcmd(0x0c); //显示开，关光标 delay(5); lcd_wcmd(0x06); //移动光标 delay(5); lcd_wcmd(0x01); //清除LCD的显示内容 delay(5); } /*******************************************************************/ /* */ /* 设定显示位置 */ /* */ /*******************************************************************/ void lcd_pos(uchar pos) { lcd_wcmd(pos | 0x80); //数据指针=80+地址变量 } //------------------------------------------------------------------- // 函数名称： iic_start() // 函数功能： 启动I2C总线子程序 //------------------------------------------------------------------- void iic_start(void) { //时钟保持高，数据线从高到低一次跳变，I2C通信开始 SDA = 1; SCL = 1; delayNOP(); // 延时5us SDA = 0; delayNOP(); SCL = 0; } //------------------------------------------------------------------- // 函数名称： iic_stop() // 函数功能： 停止I2C总线数据传送子程序 //------------------------------------------------------------------- void iic_stop(void) { SDA = 0; //时钟保持高，数据线从低到高一次跳变，I