arduino i2c的wire库使用求教
arduino i2c\u7684wire\u5e93\u4f7f\u7528\u6c42\u6559http://arduino.cc/en/Reference/Wire
\u5f00\u4e2a google \u7ffb\u8bd1,\u6216\u8005 \u5fc5\u5e94\u7ffb\u8bd1 \u6700\u591a1~2\u949f\u5c31\u80fd\u770b\u61c2.
\u7ed9\u4f60\u4e00\u4e2a DS1307 \u7684\u4f8b\u5b50. \u524d\u63d0\u662fDS1307 \u5185\u5df2\u7ecf\u6709\u8bbe\u597d\u4e86\u65f6\u95f4.
#include #define DS1307_I2C_ADDRESS0x68#define REG_SEC 0x00#define REG_MIN 0x01#define REG_HOUR0x02#define REG_DAY 0x03#define REG_DATE0x04#define REG_MON 0x05#define REG_YEAR0x06#define REG_CTL 0x07#define REG_RAM_START0x08#define REG_RAM_END 0x3Fvoid setup() {Wire.begin();// \u5f00\u542f I2C \u603b\u7ebf(\u4e3b\u8bbe\u5907)Serial.begin(9600);}void loop() {Wire.beginTransmission(DS1307_I2C_ADDRESS);// \u5f00\u542f\u53d1\u9001 Wire.write(REG_SEC);// \u5199\u5165 DS1307 \u79d2\u5730\u5740 Wire.endTransmission();//\u7ed3\u675f\u53d1\u9001 Wire.requestFrom(DS1307_I2C_ADDRESS, 1); // \u8bf7\u6c42 DS1307 \u4e00\u4e2a\u5b57\u8282 uint8_t s; if(Wire.available() == 1) { // \u53ef\u5426\u83b7\u53d61\u4e2a\u6570\u636e s = bcd2dec(Wire.read() & 0x7F); // \u8bfb\u53d6 DS1307 \u79d2 Serial.println(s); } delay(1000);}uint8_t dec2bcd(uint8_t dec) { return ((dec/10 * 16) + (dec % 10));}uint8_t bcd2dec(uint8_t bcd) { return ((bcd/16 * 10) + (bcd % 16));}
\u3000\u3000\u5f00\u4e2a google \u7ffb\u8bd1,\u6216\u8005 \u5fc5\u5e94\u7ffb\u8bd1 \u6700\u591a1~2\u949f\u5c31\u80fd\u770b\u61c2.
\u3000\u3000\u7ed9\u4f60\u4e00\u4e2a DS1307 \u7684\u4f8b\u5b50. \u524d\u63d0\u662fDS1307 \u5185\u5df2\u7ecf\u6709\u8bbe\u597d\u4e86\u65f6\u95f4.
\u3000
\u3000\u3000
\u3000\u3000#include
\u3000\u3000
\u3000\u3000#define DS1307_I2C_ADDRESS 0x68
\u3000\u3000
\u3000\u3000#define REG_SEC 0x00
\u3000\u3000#define REG_MIN 0x01
\u3000\u3000#define REG_HOUR 0x02
\u3000\u3000#define REG_DAY 0x03
\u3000\u3000#define REG_DATE 0x04
\u3000\u3000#define REG_MON 0x05
\u3000\u3000#define REG_YEAR 0x06
\u3000\u3000#define REG_CTL 0x07
\u3000\u3000
\u3000\u3000#define REG_RAM_START 0x08
\u3000\u3000#define REG_RAM_END 0x3F
\u3000\u3000
\u3000\u3000void setup() {
\u3000\u3000Wire.begin(); // \u5f00\u542f I2C \u603b\u7ebf(\u4e3b\u8bbe\u5907)
\u3000\u3000Serial.begin(9600);
\u3000\u3000}
\u3000\u3000
\u3000\u3000void loop() {
\u3000\u3000Wire.beginTransmission(DS1307_I2C_ADDRESS); // \u5f00\u542f\u53d1\u9001
\u3000\u3000Wire.write(REG_SEC); // \u5199\u5165 DS1307 \u79d2\u5730\u5740
\u3000\u3000Wire.endTransmission(); // \u7ed3\u675f\u53d1\u9001
\u3000\u3000
\u3000\u3000Wire.requestFrom(DS1307_I2C_ADDRESS, 1); // \u8bf7\u6c42 DS1307 \u4e00\u4e2a\u5b57\u8282
\u3000\u3000
\u3000\u3000uint8_t s;
\u3000\u3000if(Wire.available() == 1) { // \u53ef\u5426\u83b7\u53d61\u4e2a\u6570\u636e
\u3000\u3000s = bcd2dec(Wire.read() & 0x7F); // \u8bfb\u53d6 DS1307 \u79d2
\u3000\u3000Serial.println(s);
\u3000\u3000}
\u3000\u3000delay(1000);
\u3000\u3000}
\u3000\u3000uint8_t dec2bcd(uint8_t dec) {
\u3000\u3000return ((dec/10 * 16) + (dec % 10));
\u3000\u3000}
\u3000\u3000
\u3000\u3000uint8_t bcd2dec(uint8_t bcd) {
\u3000\u3000return ((bcd/16 * 10) + (bcd % 16));
\u3000\u3000}
所以-我们要将 读/写位元 忽略它拿掉(楼主用的方式是将整个位址右移,或是直接用人脑除以2後答案填上 都行)後 一定会变成7个bit的装置位址,也符合I2C装置位址规范(0~127)
有例程的呀
扩展阅读:www.vivo.com ... arduino mega 2560 ... arduino max6675 ... vivo x70 pro ... arduino 485 i2c ... vivo y52s ... arduino ina219 ... arduino nano vin ... arduino switch ...