arduino에서 i2c 4
개요
풀 스크래치로 master 써 보았다.
사진
회로도
샘플 코드
#include <inttypes.h>
#include <compat/twi.h>
#define F_CPU 16000000UL
#define SCL_CLOCK 50000L
#define PCF8574_ADDRESS 0x27 << 1+0
void i2c_init(void)
{
TWSR = 0;
TWBR = ((F_CPU / SCL_CLOCK) - 16) / 2;
}
unsigned char i2c_start(unsigned char address)
{
uint8_t twst;
TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if ((twst != TW_START) && (twst != TW_REP_START)) return 1;
TWDR = address;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) return 1;
return 0;
}
void i2c_stop(void)
{
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
while (TWCR & (1 << TWSTO));
}
unsigned char i2c_write(unsigned char data)
{
uint8_t twst;
TWDR = data;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if (twst! = TW_MT_DATA_ACK) return 1;
return 0;
}
void send (uint8_t d)
{
uint8_t s;
i2c_start (PCF8574_ADDRESS);
i2c_write(d);
s = d|0x04;
i2c_write(s);
delayMicroseconds(1);
s=d&0xfb;
i2c_write(s);
delayMicroseconds(1);
i2c_stop();
}
void set (uint8_t d)
{
uint8_t s;
uint8_t f1=d&0xf0;
uint8_t f2 = d << 4;
i2c_start (PCF8574_ADDRESS);
s = f1;
i2c_write(s);
s = f1|0x04;
i2c_write(s);
delayMicroseconds(1);
s = f1 & 0xfb;
i2c_write(s);
i2c_stop();
i2c_start (PCF8574_ADDRESS);
s = f2;
i2c_write(s);
s = f2|0x04;
i2c_write(s);
delayMicroseconds(1);
s = f2 & 0xfb;
i2c_write(s);
i2c_stop();
}
void data (uint8_t d)
{
uint8_t s;
uint8_t f1=d&0xf0;
uint8_t f2 = d << 4;
i2c_start (PCF8574_ADDRESS);
s = f1;
i2c_write(s);
s = f1|0x05;
i2c_write(s);
delayMicroseconds(1);
s = f1 & 0xfa;
i2c_write(s);
i2c_stop();
i2c_start (PCF8574_ADDRESS);
s = f2;
i2c_write(s);
s = f2|0x05;
i2c_write(s);
delayMicroseconds(1);
s = f2 & 0xfa | 0x08;
i2c_write(s);
i2c_stop();
}
void setup()
{
unsigned char c;
unsigned char address;
int nDevices;
Serial.begin(115200);
i2c_init();
send(0x03);
delayMicroseconds(50);
send(0x03);
delayMicroseconds(50);
send(0x03);
delayMicroseconds(15);
send(0x02);
set(0x28);
set(0x0c);
set(0x01);
set(0x06);
data(0x68);
data(0x65);
data(0x6c);
data(0x6c);
data(0x6f);
data(0x2c);
data(0x20);
data(0x77);
data(0x6f);
data(0x72);
data(0x6c);
data(0x64);
data(0x21);
Serial.println("ok");
}
void loop()
{
delay(100);
}
이상.
Reference
이 문제에 관하여(arduino에서 i2c 4), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다
https://qiita.com/ohisama@github/items/114177e227da2d4566fa
텍스트를 자유롭게 공유하거나 복사할 수 있습니다.하지만 이 문서의 URL은 참조 URL로 남겨 두십시오.
우수한 개발자 콘텐츠 발견에 전념
(Collection and Share based on the CC Protocol.)
회로도
샘플 코드
#include <inttypes.h>
#include <compat/twi.h>
#define F_CPU 16000000UL
#define SCL_CLOCK 50000L
#define PCF8574_ADDRESS 0x27 << 1+0
void i2c_init(void)
{
TWSR = 0;
TWBR = ((F_CPU / SCL_CLOCK) - 16) / 2;
}
unsigned char i2c_start(unsigned char address)
{
uint8_t twst;
TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if ((twst != TW_START) && (twst != TW_REP_START)) return 1;
TWDR = address;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) return 1;
return 0;
}
void i2c_stop(void)
{
TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
while (TWCR & (1 << TWSTO));
}
unsigned char i2c_write(unsigned char data)
{
uint8_t twst;
TWDR = data;
TWCR = (1 << TWINT) | (1 << TWEN);
while (!(TWCR & (1 << TWINT)));
twst = TW_STATUS & 0xF8;
if (twst! = TW_MT_DATA_ACK) return 1;
return 0;
}
void send (uint8_t d)
{
uint8_t s;
i2c_start (PCF8574_ADDRESS);
i2c_write(d);
s = d|0x04;
i2c_write(s);
delayMicroseconds(1);
s=d&0xfb;
i2c_write(s);
delayMicroseconds(1);
i2c_stop();
}
void set (uint8_t d)
{
uint8_t s;
uint8_t f1=d&0xf0;
uint8_t f2 = d << 4;
i2c_start (PCF8574_ADDRESS);
s = f1;
i2c_write(s);
s = f1|0x04;
i2c_write(s);
delayMicroseconds(1);
s = f1 & 0xfb;
i2c_write(s);
i2c_stop();
i2c_start (PCF8574_ADDRESS);
s = f2;
i2c_write(s);
s = f2|0x04;
i2c_write(s);
delayMicroseconds(1);
s = f2 & 0xfb;
i2c_write(s);
i2c_stop();
}
void data (uint8_t d)
{
uint8_t s;
uint8_t f1=d&0xf0;
uint8_t f2 = d << 4;
i2c_start (PCF8574_ADDRESS);
s = f1;
i2c_write(s);
s = f1|0x05;
i2c_write(s);
delayMicroseconds(1);
s = f1 & 0xfa;
i2c_write(s);
i2c_stop();
i2c_start (PCF8574_ADDRESS);
s = f2;
i2c_write(s);
s = f2|0x05;
i2c_write(s);
delayMicroseconds(1);
s = f2 & 0xfa | 0x08;
i2c_write(s);
i2c_stop();
}
void setup()
{
unsigned char c;
unsigned char address;
int nDevices;
Serial.begin(115200);
i2c_init();
send(0x03);
delayMicroseconds(50);
send(0x03);
delayMicroseconds(50);
send(0x03);
delayMicroseconds(15);
send(0x02);
set(0x28);
set(0x0c);
set(0x01);
set(0x06);
data(0x68);
data(0x65);
data(0x6c);
data(0x6c);
data(0x6f);
data(0x2c);
data(0x20);
data(0x77);
data(0x6f);
data(0x72);
data(0x6c);
data(0x64);
data(0x21);
Serial.println("ok");
}
void loop()
{
delay(100);
}
이상.
Reference
이 문제에 관하여(arduino에서 i2c 4), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다
https://qiita.com/ohisama@github/items/114177e227da2d4566fa
텍스트를 자유롭게 공유하거나 복사할 수 있습니다.하지만 이 문서의 URL은 참조 URL로 남겨 두십시오.
우수한 개발자 콘텐츠 발견에 전념
(Collection and Share based on the CC Protocol.)
Reference
이 문제에 관하여(arduino에서 i2c 4), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://qiita.com/ohisama@github/items/114177e227da2d4566fa텍스트를 자유롭게 공유하거나 복사할 수 있습니다.하지만 이 문서의 URL은 참조 URL로 남겨 두십시오.
우수한 개발자 콘텐츠 발견에 전념
(Collection and Share based on the CC Protocol.)
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