Example Path: examples/I2C/Wire/RTC_RV3032

Supported Platforms: SOMRT1061 with DEV-SOMRT1061

External Real-Time Clock example using the Micro Crystal RV3032 RTC connected to the I2C bus, such as with the SOMRT1061-200IR on the DEV-SOMRT1061 development board containing the RV3032.

The example uses the Wire interface class for I2C operation, and requires an Internet connection to obtain the current time with NTP.

Creates a NtpClientServlet instance to run as a background task in the configuration server.
Reads the time stored in the RTC
Compares the two values and sets the RTC to the NTP time if there is a difference of 2 minutes or more.

There are multiple I2C peripherals on each NetBurner platform as indicated in the tables below. The first

line is the default.

SOMRT1061

SCL	SOMRT PIN	SDA	SOMRT PIN	Pin Func	Module
Pin_EMC_12	9	Pin_EMC_11	10	PIN_FN_2	4
Pin_SD_B0_00	27	Pin_SD_B0_01	26	PIN_FN_2	3
Pin_AD_B1_00	40	Pin_AD_B1_01	41	PIN_FN_3	1
Pin_AD_B1_07	47	Pin_AD_B1_06	46	PIN_FN_1	3
Pin_EMC_22	92	Pin_EMC_21	91	PIN_FN_2	3

The numbers above are the values to pass to TwoWire(int sclpin, int sdapin), that is, Pins[] indices. For every row except the last they are also the module connector pin number.

The last row is the exception. Pin_EMC_22 and Pin_EMC_21 are secondary CPU pads bonded to the same traces as module connector pins 83 and 84, and they have their own Pins[] indices, 92 and 91. Wire the device to connector pins 83 and 84, but pass Pins[92] and Pins[91]. Passing Pins[83] and Pins[84] selects the primary pads EMC_26 and EMC_25, which have no I2C function, so no hardware module is bound and every transaction fails. That row also requires nothing else to drive those two traces.

A carrier board may already use some of these pins for other purposes. Check the schematic for the board in use.

MODM7AE70

Module	SCL	SDA
I2C0	P2.42	P2.39
I2C1	P2.12	P2.22
I2C2	P2.23	P2.26

SBE70LC

Module	SCL	SDA
I2C0	17	16

MOD5441X

Module	SCL	SDA
I2C0	J2.42	J2.39
I2C1	J2.41	J2.44

NANO54415

Module	SCL	SDA
I2C0	27	29
I2C1	22	20
I2C4	26	24
I2C5	34	32

SB800EX

Module	SCL	SDA
I2C4	5	4