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AD#ifndef _PCF8591_H#define _PCF8591_H#include reg52.h#include intrins.h#define somenop _nop_();_nop_();_nop_();_nop_();_nop_();sbit SDA = P21;sbit SCL = P20;#define CHANNEL_0 0x00#define CHANNEL_1 0x01#define CHANNEL_2 0x02#define CHANNEL_3 0x03void iic_start(void);void iic_stop(void);void iic_ack(bit ackbit);void iic_sendbyte(unsigned char byt);void delay(unsigned char t);unsigned char adc_pcf8591(void);bit iic_waitack(void);unsigned char i2c_recbyte(void);#endif#include pcf8591.hvoid iic_start(void) SDA = 1; _nop_(); SCL = 1; somenop; SDA = 0; somenop; SCL = 0;void iic_stop(void) SDA = 0; _nop_(); SCL = 1; somenop; SDA = 1;void iic_ack(bit ackbit) if(ackbit) SDA = 0; else SDA = 1; somenop; SCL = 1; somenop; SCL = 0; SDA = 1; somenop;bit iic_waitack(void) SDA = 1; somenop; SCL = 1; somenop; if(SDA) SCL = 0;iic_stop();return 0; else SCL = 0;return 1; void iic_sendbyte(unsigned char byt) unsigned char i; for(i=0;i8;i+) if(byt&0x80) SDA = 1;else SDA = 0;somenop;SCL = 1;byt = 1;somenop; SCL = 0; unsigned char iic_recbyte(void) unsigned char da; unsigned char i; for(i=0;i8;i+) SCL = 1;somenop;da = 1;if(SDA) da |= 0x01;SCL = 0;somenop; return da;void delay(unsigned char t) unsigned char i; while(t-) for(i=0;i99) P0 = 0xFF;P2 |= 0xE0;P2 &= 0x1F;P0 = dsp_code_cad/100;P2 |= 0xE0;P2 &= 0x1F;P0 = 0x20;P2 |= 0xC0;P2 &= 0x3F; if(dspflag = 1)&(d9) P0 = 0xFF; P2 |= 0xE0; P2 &= 0x1F;P0 = dsp_code_cad%100/10; P2 |= 0xE0; P2 &= 0x1F; P0 = 0x40; P2 |= 0xC0; P2 &= 0x3F; if(dspflag = 2) P0 = 0xFF;P2 |= 0xE0; P2 &= 0x1F;P0 = dsp_code_cad%100%10; P2 |= 0xE0; P2 &= 0x1F; P0 = 0x80; P2 |= 0xC0; P2 &= 0x3F; DA#ifndef _PCF8591_H#define _PCF8591_H#include reg52.h#include intrins.h#define somenop _nop_();_nop_();_nop_();_nop_();_nop_();sbit SDA = P21;sbit SCL = P20;#define CHANNEL_0 0x00#define CHANNEL_1 0x01#define CHANNEL_2 0x02#define CHANNEL_3 0x03void iic_start(void);void iic_stop(void);void iic_ack(bit ackbit);void iic_sendbyte(unsigned char byt);bit iic_waitack(void);unsigned char i2c_recbyte(void);#endif#include pcf8591.hvoid iic_start(void) SDA = 1; _nop_(); SCL = 1; somenop; SDA = 0; somenop; SCL = 0;void iic_stop(void) SDA = 0; _nop_(); SCL = 1; somenop; SDA = 1;void iic_ack(bit ackbit) if(ackbit) SDA = 0; else SDA = 1; somenop; SCL = 1; somenop; SCL = 0; SDA = 1; somenop;bit iic_waitack(void) SDA = 1; somenop; SCL = 1; somenop; if(SDA) SCL = 0;iic_stop();return 0; else SCL = 0;return 1; void iic_sendbyte(unsigned char byt) unsigned char i; for(i=0;i8;i+) if(byt&0x80) SDA = 1;else SDA = 0;somenop;SCL = 1;byt = 1;somenop; SCL = 0; unsigned char iic_recbyte(void) unsigned char da; unsigned char i; for(i=0;i8;i+) SCL = 1;somenop;da = 1;if(SDA) da |= 0x01;SCL = 0;somenop; return da;void delay(unsigned char t) unsigned char i; while(t-) for(i=0;i99) P0 = 0xFF;P2 |= 0xE0;P2 &= 0x1F;P0 = dsp_code_cad/100;P2 |= 0xE0;P2 &= 0x1F;P0 = 0x20;P2 |= 0xC0;P2 &= 0x3F; if(dspflag = 1)&(d9) P0 = 0xFF; P2 |= 0xE0; P2 &= 0x1F;P0 = dsp_code_cad%100/10; P2 |= 0xE0; P2 &= 0x1F; P0 = 0x40; P