6LoWPAN T click carries the CC2520 2.4GHz RF transceiver. The click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over SPI interface, with additional functionality provided by the following pins on the mikroBUS™ line: PWM, INT, RST, AN.

CC2520 features

The CC2520 is TI's second-generation ZigBee®/IEEE 802.15.4 RF transceiver for the 2.4GHz unlicensed ISM band. This chip enables industrial grade applications by offering state-of-the-art selectivity/co-existence, excellent link budget, operation up to 125°C and low voltage operation.

In addition, the CC2520 provides extensive hardware support for frame handling, data buffering, burst transmissions, data encryption, data authentication, clear channel assessment, link quality indication and frame timing information.

Specifications

Pinout diagram

This table shows how the pinout on 6LowPAN T click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
General purpose digital I/O	RF GPIO0	1	AN	PWM	16	RF VREG EN	When high, digital voltage regulator is active
External reset pin, active low	RF RST#	2	RST	INT	15	RF GPIO 1	General purpose digital I/O
Chip select	RF CS	3	CS	TX	14	NC
Serial clock	RF SCK	4	SCK	RX	13	NC
Master input slave output	RF MISO	5	MISO	SCL	12	NC
Master output slave input	RF MOSI	6	MOSI	SDA	11	NC
Power supply	+3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Programming

Code examples for 6LoWPAN T click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code snippet, taken from our 6LoWPAN click example for clicker 2 for MSP432, shows how data is transmitted and received between two MCUs using 6LoWPAN clicks.

The value of _RECEIVER_ determines whether the MCU will behave as a receiver or a transmitter. RF channel, PAN ID, and individual addresses are also defined.

There is an interrupt routine for detecting a button press, which is used in the transmitter code to indicate that a package should be sent.

The other interrupt routine is connected to the GP1 line of the click itself and will trigger when new data is ready to be received. It will check the received package, and turn on the data ready indicator if everything is fine.

In the main routine, after some initialization code, two sections can be found - one for the receiver and the other one for the transmitter.

The receiver will check the package ready indicator and handle the received package. In this example, an LED will be toggled to indicate successful data transfer.

The transmitter will wait for a flag to be set from the button interrupt routine. When the flag is set, a package will be sent to the receiver.

01 #if RECEIVER
02     // Initialize BasicRF
03     config.myAddr = LIGHT_ADDR;
04     if (C6LP_init(&config) == FAILED)
05         LED1 = 1;
06         
07     C6LP_receiveOn();
08     EnableInterrupts();
09     
10     while (1)
11     {
12         while (!C6LP_isPacketReady());
13 
14         if (C6LP_receive(pRxData, APP_PAYLOAD_LENGTH, 0) > 0)
15         {
16             if (pRxData[0] == LIGHT_TOGGLE_CMD)
17             {
18                 LED0 = !LED0;
19             }
20         }
21     }
22 #else
23     pTxData[0] = LIGHT_TOGGLE_CMD;
24 
25     // Initialize BasicRF
26     config.myAddr = SWITCH_ADDR;
27     if (C6LP_init(&config) == FAILED)
28         LED1 = 1;
29     
30     // Keep Receiver off when not needed to save power
31     C6LP_receiveOff();
32 
33     flag = 0;
34     EnableInterrupts();
35     while (1)
36     {
37         if (flag)
38         {
39             flag = 0;
40             LED0 = !LED0;
41             C6LP_sendPacket(LIGHT_ADDR, pTxData, APP_PAYLOAD_LENGTH);
42             EnableInterrupts();
43         }
44     }
45 #endif

Downloads

• mikroBUS™ Standard specification
• CC2520 datasheet
• LibStock: 6LoWPAN click library
• 6LoWPAN T click schematic