Exploring Raspberry Pi by Derek Molloy

Author:Derek Molloy
Language: eng
Format: mobi, epub
ISBN: 9781119188698
Published: 2016-05-31T00:00:00+00:00

I2C AND WIRINGPi

The wiringPi library that is installed in Chapter 6 has a library of C functions for interacting with I2C bus devices. This short code example reads the first three registers from the DS3231 RTC and displays the current time:

pi@erpi ~/exploringrpi/chp08/i2c/wiringPi $ more DS3231.c #include<wiringPiI2C.h> #include<stdio.h> int main(){ int fd = wiringPiI2CSetup(0x68); int secs = wiringPiI2CReadReg8(fd, 0x00); int mins = wiringPiI2CReadReg8(fd, 0x01); int hours = wiringPiI2CReadReg8(fd, 0x02); printf("The RTC time is %2d:%02d:%02d\n", hours, mins, secs); return 0; } pi@erpi ~/exploringrpi/chp08/i2c/wiringPi $ gcc DS3231.c -o rtc -lwiringPi pi@erpi ~/exploringrpi/chp08/i2c/wiringPi $ ./rtc The RTC time is 10:08:83

There is more information on this library at tiny.cc/erpi804. Be aware that this library is written specifically for the RPi platform; it will not work on other embedded Linux devices that do not contain the same SoC.

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