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標(biāo)題: AVR單片機(jī)I2C總線程序 [打印本頁]

作者: 1804181935 時(shí)間: 2019-7-27 08:41
標(biāo)題: AVR單片機(jī)I2C總線程序
#include "iom16v.h"

/*I2C總線主機(jī)模式錯誤處理*/
void error(unsigned char type) {

switch (type & 0xF8) {
case 0x20: /*址址寫失敗*/
/*stop 停止*/
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
break;
case 0x30: /*數(shù)據(jù)寫失敗*/
/*stop 停止*/
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
break;
case 0x38: /*仲裁失敗*/
break;
case 0x48: /*址址讀失敗*/
/*stop 停止*/
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
break;
}
}

/*I2C總線單字節(jié)寫入*/
unsigned char twi_write(unsigned char addr, unsigned char dd) {

TWBR = 2;

/*start 啟動*/
TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x08) {
error(TWSR);
return 0;
}

/*SLA_W 芯片地址*/
TWDR = 0xA0;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x18) {
error(TWSR);
return 0;
}

/*addr 操作地址*/
TWDR = addr;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x28) {
error(TWSR);
return 0;
}

/*dd 寫入數(shù)據(jù)*/
TWDR = dd;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x28) {
error(TWSR);
return 0;
}

/*stop 停止*/
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
return 1;
}

/*I2C總線單字節(jié)讀取*/
unsigned char twi_read(unsigned char addr, unsigned char *dd) {

TWBR = 2;

/*start 啟動*/
TWCR=(1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
while(!(TWCR&(1<<TWINT)));
if ((TWSR & 0xF8) != 0x08) {
error(TWSR);
return 0;
}

/*SLA_W 芯片地址*/
TWDR = 0xA0;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x18) {
error(TWSR);
return 0;
}

/*addr 操作地址*/
TWDR = addr;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x28) {
error(TWSR);
return 0;
}

/*start 啟動*/
TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x10) {
error(TWSR);
return 0;
}

/*SLA_R 芯片地址*/
TWDR = 0xA1;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x40) {
error(TWSR);
return 0;
}

/*讀取數(shù)據(jù)*/
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
if ((TWSR & 0xF8) != 0x58) {
error(TWSR);
return 0;
}
*dd = TWDR;

/*stop 停止*/
TWCR = (1 << TWINT) | (1 << TWSTO) | (1 << TWEN);
return 1;
}

013-IIC-LED.rar

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作者: billtest36 時(shí)間: 2019-11-5 11:40
太好了感謝板主分享是一個(gè)完整的案例分享

作者: jjj12345 時(shí)間: 2019-11-9 12:26

billtest36 發(fā)表于 2019-11-5 11:40
太好了感謝板主分享是一個(gè)完整的案例分享

太好了，可以試試顯示屏驅(qū)動。

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