ATMEGA16读写iic(TWI)(24c02) C语言程序

ATMEGA16读写iic(24c02) C语言程序测试通过#include <iom16v.h>#include "I2C.h"#include "1602.h"#include "delay.h"/*通过AVR往I IC写数据，并通过串口把数据读出显示出来*///===============================================================void UART_init(void) //UART初始化{ DDRD = 0x02;PORTD = 0x00;UCSRA = 0x02; /*无倍速*/UCSRB = 0x18; /*允许接收和发送*/UC SRC = 0x06; /*8位数据,1位停止位，无校验*/UBRRH = 0x00;UBRRL = 12; /*9600*/}//===============================================================void USART_TXD(float data) //发送采用查询方式{while( !(UCSRA & BIT(UDRE)) );UDR=data;while( !(UCSRA & BIT(TXC )) );UCSRA|=BIT(TXC);}void main(void){unsigned char i;//LCD_init();uart_init();//TART初始化SEI(); //全局中断使能while(1){/*I2C_Write('n',0x00);I2C_Write('c',0x01);I2C_Write('e',0x02);I2C_Write('p',0x03);I2C_Write('u',0x04);*/i=I2C_Read(0x00);//LCD_write_char(0,0,i); USART_TXD(i);i=I2C_Read(0x01);//LCD_write_data(i);USART_TXD(i);i=I2C_Read(0x02);//LCD_write_data(i);USART_TXD(i);i=I2C_Read(0x03);//LCD_write_data(i);USART_TXD(i);i=I2C_Read(0x04);//LCD_write_data(i);USART_TXD(i);}}/*上面上主函数部分*/#include <macros.h>#include "delay.h"//I2C 状态定义//MT 主方式传输 MR 主方式接受#define START 0x08#define RE_START 0x10#define MT_SLA_ACK 0x18#define MT_SLA_NOACK 0x20#define MT_DATA_ACK 0x28#define MT_DATA_NOACK 0x30 #define MR_SLA_ACK 0x40#define MR_SLA_NOACK 0x48#define MR_DATA_ACK 0x50#define MR_DATA_NOACK 0x58#define RD_DEVICE_ADDR 0xA1 //前4位器件固定,后三位看连线,最后1位是读写指令位#define WD_DEVICE_ADDR 0xA0//常用TWI操作(主模式写和读)#define Start() (TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN)) //启动I2C#define Stop() (TWCR=(1<<TWINT)|(1<<TWSTO)|(1<<TWEN)) //停止I2C#define Wait() {while(!(TWCR&(1<<TWINT)));} //等待中断发生#define TestAck() (TWSR&0xf8) //观察返回状态#define SetAck (TWCR|=(1<<TWEA)) //做出ACK应答#define SetNoAck (TWCR&=~(1<<TWEA)) //做出Not Ack应答#define Twi() (TWCR=(1<<TWINT)|(1<<TWEN)) //启动I2C#define Write8Bit(x) {TWDR=(x);TWCR=(1<<TWINT)|(1<<TWEN);} //写数据到TWDRunsigned char I2C_Write(unsigned char Wdata,unsigned char RegAddress); unsigned char I2C_Read(unsigned RegAddress);/*********************************************I2C总线写一个字节返回0:写成功返回1:写失败**********************************************/unsigned char I2C_Write(unsigned char Wdata,unsigned char RegAddress){Start(); //I2C启动Wait();if(TestAck()!=START)return 1; //ACKWrite8Bit(WD_DEVICE_ADDR); //写I2C从器件地址和写方式Wait();if(TestAck()!=MT_SLA_ACK)return 1; //ACKWrite8Bit(RegAddress); //写器件相应寄存器地址Wait();if(TestAck()!=MT_DATA_ACK)return 1; //ACKWrite8Bit(Wdata); //写数据到器件相应寄存器Wait();if(TestAck()!=MT_DATA_ACK)return 1; //ACKStop(); //I2C停止delay_nms(10); //延时return 0;}/*********************************************I2C总线读一个字节返回0:读成功返回1:读失败**********************************************/ unsigned char I2C_Read(unsigned RegAddress){unsigned char temp;Start();//I2C启动Wait();if (TestAck()!=START)return 1; //ACKWrite8Bit(WD_DEVICE_ADDR); //写I2C从器件地址和写方式Wait();if (TestAck()!=MT_SLA_ACK)return 1; //ACKWrite8Bit(RegAddress); //写器件相应寄存器地址Wait();if (TestAck()!=MT_DATA_ACK)return 1;Start(); //I2C重新启动Wait();if (TestAck()!=RE_START)return 1;Write8Bit(RD_DEVICE_ADDR); //写I2C从器件地址和读方式Wait();if(TestAck()!=MR_SLA_ACK)return 1; //ACKTwi(); //启动主I2C读方式Wait();if(TestAck()!=MR_DATA_NOACK)return 1; //ACKtemp=TWDR;//读取I2C接收数据Stop();//I2C停止return temp;}/*以上是IIC.h头文件部分，需要对照技术文档好好研究*/*----------------------------------------------------------------------- 延时函数编译器：I CC-AVR v6.31A 日期: 2005-11-24 20:29:57目标芯片 : M16时钟: 8.0000M Hz作者：archeng504-----------------------------------------------------------------------*/ #ifndef __delay_h#define __delay_hvoid delay_nus(unsigned int n);void delay_nms(unsigned int n);void delay_1us(void);void delay_1ms(void) ;void delay_1us(void) //1us延时函数{asm("nop");}void delay_nus(unsigned int n) //N us延时函数{unsigned int i=0;for (i=0;i<n;i++)delay_1us();}void delay_1ms(void) //1ms延时函数{unsigned int i;for (i=0;i<1140;i++);}void delay_nms(unsigned int n) //N ms延时函数{unsigned int i=0;for (i=0;i<n;i++)delay_1ms();}#endif/*以上是delay.h部分，再加上IIC中自带的iom16v.h 和macros.h就可以编译通过*//*注意点：本程序在实验板ATMEGA16上测试通过，在示波器把SCL，SDA信号线有数据，移值到自己电路上可以放心使用，在ATMEGA32上一样使用，本人24C02的A2，A1，A0都是接地，若地址不一样，在程序相应位置改一下就可以，串口上调试单片机的基础，所以它一定要会用*//*本程序调试软件环境是ICC6.31*/。