RN4678 Click

RN4678 click carries the RN4678 Bluetooth® 4.2 dual mode module from Microchip. The click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over I2C and UART interface, with additional functionality provided by the following pins on the mikroBUS™ line: AN, RST, CS, PWM, INT.

RN4678 module features

The RN4678 from Microchip is a fully certified, Bluetooth version 4.2 module. Use it to add Bluetooth wireless capability to your project.

The module includes an on-board Bluetooth stack, power management subsystem, 2.4 GHz transceiver, and RF power amplifier.

Data transfer is achieved through the Bluetooth link by sending or receiving data through SPP in Bluetooth (BT) Classic mode and through Transparent UART in the BLE mode.

The RN4678 contains an integral ceramic chip antenna.

Strong encryption

The RN4678 module has strong AES128 Encryption. A 128-bit encryption is one of the most powerfull encryption algorithms. AES stands for Advanced Encryption Standard and it is a symmetric encryption algorithm. 

Specifications

Pinout diagram

This table shows how the pinout on RN4678 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Software Button	SW_BTN	1	AN	PWM	16	WKUP	Wake-up from Sleep mode
Module Reset (internal pull-up). Apply a pulse of at least 63 ns.	RST_N	2	RST	INT	15	CTS	Clear To Send
Configurable Control or Indication pin or UART RTS (output)	RTS	3	CS	TX	14	TXD	UART data output
	NC	4	SCK	RX	13	RXD	UART data input
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power supply	+3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Jumpers and Settings

Programming

Code examples for RN4678 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the main function of the master example, which initializes the System as a master device in the network, and then enters a loop. While in the loop, the system will connect to a remote click upon a button click, listen for received data, and output it when it is recieved.

01 void main()
02 {
03    systemInit();
04 
05    OUTPUT ("rnINITIALIZED");
06    OUTPUT ("rnPress button A4 or A0 to connect to corresponding sensors");
07 /*
08 * Main loop. Listens for requests.
09 */
10    while (1)
11    {
12 /*Checks if there is sentence to be parsed, and sends it for parsing*/
13        RN4xxx_read ();
14 /*If parsed sentence was a correct response, will print out response*/
15        if (checkRes ())
16        {
17            OUTPUT ("rnReceived data: ");
18            OUTPUT (msgData.payload);
19 /*After printing, response has to be cleared*/
20            msgClear ();
21        }
22 
23 /*If button RN4xxx_CON1_PIN is pressed, will connect to sensor 1*/
24        if (RN4xxx_CON1_PIN)
25        {
26            OUTPUT ("rnConnecting to thermo k sensor...");
27            sendReq (RN4xxx_ID_SENSOR1, RN4xxx_ADDR_SENSOR1);
28        }
29 /*If button RN4xxx_CON2_PIN is pressed, will connect to sensor 2*/
30        if (RN4xxx_CON2_PIN)
31        {
32            OUTPUT ("rnConnecting to earthquake sensor...");
33            sendReq (RN4xxx_ID_SENSOR2, RN4xxx_ADDR_SENSOR2);
34        }
35        
36        Delay_ms (1);
37    }
38 
39 }