i2C problems #1071
Description
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If you have a Guru Meditation Error, please decode it:
https://github.com/me-no-dev/EspExceptionDecoder
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Hardware:
Board: Espressif ESP32 ESP32-DEVKITC
Core Installation/update date: 25 Jan 18
IDE name: Arduino IDE 1.8.5 - Windows 10
Flash Frequency: 80 Mhz
Upload Speed: 921600
Description:
Trying to read time from the Adafruit DS1307 Board (https://www.adafruit.com/product/3296) - completely functional with ESP8266 & Arduino UNO over i2C - unable to read from ESP32. This is the test/demo code supplied by Adafruit - also using their library - the only thing I changed was adding and removing the #include <WiFi.h> when compiling for ESP32.
On the ESP32 I connected the i2C signals as follows:
SCL - GPIO21
SDA - GPIO22
(the connections didn't match up with what i'd read online - i found these via Oscilliscope & trial & error while running demo code below).
I'm attaching Oscilliscope captures from each of the three test scenarios.
This is my first time to post so please 'be gentle' LOL !
Arduino UNO
ESP32 Dev
ESP32 Dev
ESP32 Dev
ESP-8266
Sketch:
// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
//#include <WiFi.h>
#include <Wire.h>
#include "RTClib.h"
#if defined(ARDUINO_ARCH_SAMD)
// for Zero, output on USB Serial console, remove line below if using programming port to program the Zero!
#define Serial SerialUSB
#endif
RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
void setup () {
#ifndef ESP8266
while (!Serial); // for Leonardo/Micro/Zero
#endif
Serial.begin(9600);
if (! rtc.begin()) {
Serial.println("Couldn't find RTC");
while (1);
}
if (! rtc.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(DATE), F(TIME)));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}
}
void loop () {
DateTime now = rtc.now();
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(" (");
Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
Serial.print(") ");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
Serial.print(" since midnight 1/1/1970 = ");
Serial.print(now.unixtime());
Serial.print("s = ");
Serial.print(now.unixtime() / 86400L);
Serial.println("d");
// calculate a date which is 7 days and 30 seconds into the future
DateTime future (now + TimeSpan(7,12,30,6));
Serial.print(" now + 7d + 30s: ");
Serial.print(future.year(), DEC);
Serial.print('/');
Serial.print(future.month(), DEC);
Serial.print('/');
Serial.print(future.day(), DEC);
Serial.print(' ');
Serial.print(future.hour(), DEC);
Serial.print(':');
Serial.print(future.minute(), DEC);
Serial.print(':');
Serial.print(future.second(), DEC);
Serial.println();
Serial.println();
delay(3000);
}
Debug Messages:
Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here