![]() This can be done only once after reset and the maximum value 4096 is equivalent to 4096 / 256 = 16 seconds. This function modify the Watchdog Timer Mode Register. Optionally, you can reduce the period of the watchdog with a call to WDT_Enable(). So, when variable waitTime reach the value of 16, watchdog' counter reach 0 before the delay() function finish and a reset occurs. Serial.print( "Following function last " ) īy default, watchdog period is set to its maximum value, 16 seconds. Second, insert at the beginning of the loop() function a call to function WDT_Restart() in order to restart the watchdog' timer each time the loop is executed. If you have difficulty setting up I2C communication between different devices, don’t hesitate to leave us a comment or contact us.First, it is necessary to comment line 353 of file variant.cpp in subdirectory * arduino-1.5.2\hardware\arduino\sam\variants\arduino_due_x* // Disable watchdog Wire.onRecieve () manages the data reception functionĬode of the “Master” card #include # define I2C_SLAVE1_ADDRESS 11 # define I2C_SLAVE2_ADDRESS 12 #define PAYLOAD_SIZE 2 int n = 0 void setup ( ).Wire.onRequest () handles the request receive function.Wire.endTransmission ends data transmission.Wire.beginTransmission () starts transmitting data and defines the receiver.Wire.requestFrom () handles the request receive function.Wire.write () allows you to send bytes.Function argument may be empty for master devices Wire.begin () initializes the device address.The functions are similar to the Serial library. The Wire.h library allows you to easily define the serial communication on the I2C bus. Generally, one card will send information (Writer) and another will receive it (Reader). In order for the two cards to communicate with each other, they must be connected correctly (A4 with A4 and A5 with A5) and do not forget to connect the earths (GND) as shown in the following diagram.Ĭaution: If pins A4 and A5 are connected to the pins of a non-powered card, the code will freeze at the time of transmission. In this example we use an Arduino Uno board, so the pins A4 and A5. One on which the data is sent (SDA Serial Data Line) and on the other the synchronization clock (SLC Serial Clock Line). The pins used by I2C communication are usually fixed for each device. For that, we have to write at least two programs, one for the “Mistress” card (Master) and the other for the “Slaves” cards.Īn I2C communication is defined by a two-wire bus (sometimes called TWI, Two Wire Interface) and an address. An interesting example is the communication between several Arduino boards. With the I2C protocol, it is also possible to communicate between different systems (sensors, LCD screen, Raspberry Pi, etc.). ![]() ![]()
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