46 lines
1.9 KiB
Arduino
46 lines
1.9 KiB
Arduino
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#include <Wire.h>
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// Set up a serial monitor port and initialize the MCP79400 to run.
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void setup()
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{
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Wire.begin(); // join i2c bus (address optional for master)
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Serial.begin(9600); // start serial for output
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Wire.beginTransmission(0x6f); // transmit to device address 111 (0x6F)
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Wire.write(0); // point to internal register “0”
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Wire.write(0x80); // Set highest bit to enable 32KHz clock
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Wire.endTransmission(0); // send bytes and stop transmission
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delay(5);
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Wire.beginTransmission(0x6f); // transmit to device address 111 (0x6F)
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Wire.write(7); // point to internal register “7”
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Wire.write(0x40); // make MFP pin an output w/ 1HZ square wave
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Wire.endTransmission(0); // send bytes and stop transmission
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delay(5);
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}
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// Main program loop reads MCP79400 registers associated with time/date.
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void loop()
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{
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Wire.beginTransmission(0x6f); // transmit to device address 111 (0x6F)
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Wire.write(0); // point to internal register “0”
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Wire.endTransmission(); // send bytes and stop transmission
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Wire.requestFrom(0x6f,6); // reads bytes from sequential addresses
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byte Seconds = Wire.read(); // receive a byte
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byte Minutes = Wire.read(); // receive a byte
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byte Hours = Wire.read(); // receive a byte
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byte Day = Wire.read(); // receive a byte
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byte Date = Wire.read(); // receive a byte
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byte Month = Wire.read(); // receive a byte
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byte Year = Wire.read(); // receive a byte
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//Convert BCD seconds to total seconds and send to serial monitor
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Serial.print((((Seconds&0x70)>>4)*10)+(Seconds&0x0f)); // print seconds
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Serial.println(" seconds");
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delay(1000);
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}
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