IrDA2 click

IrDA2 click is a compact and easy solution for adding infrared communication to your device. It features TFDU4101 infrared transceiver module as well as MCP2120 infrared encoder/decoder from Microchip connected with the 7.3728 MHz external crystal. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target board via UART interface and the following mikroBUS™ pins: AN, RST, CS.

Essential features

The combination of the TFDU4101 and MCP2120 results in support for fast and stable infrared data communication. The TFDU4101 infrared transceiver module covers the full IrDA range of more than 1m and speed up to 115.2 kbit/s.

Application

With low power consumption, all these features make IrDA2 click ideal for TV and video systems, printers, fax machines, copiers, external infrared adapters, diagnostic systems and other industrial applications.

Key features

• MCP2120 infrared encoder/decoder

  • Up to IrDA standard 115.2 kbaud operation
• TFDU4101 infrared transceiver
• UART interface
• 3.3V or 5V power supply

Specification

Pinout diagram

This table shows how the pinout on IrDA2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin	mikroBUStm				Pin	Notes
Selects the device mode (Data/Command) for Software Baud Rate operation	MODE	1	AN	PWM	16	NC	Not connected
Resets the device	RESET#	2	RST	INT	15	NC	Not connected
Device Enable	ENABLE	3	CS	TX	14	TX	UART Transmit
Not connected	NC	4	SCK	RX	13	RX	UART Receive
Not connected	NC	5	MISO	SCL	12	NC	Not connected
Not connected	NC	6	MOSI	SDA	11	NC	Not connected
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

SMD jumpers

Jumpers J0, J1 and J2 connect MCP2120 controller BAUD0, BAUD1 and BAUD2 pins to VCC or GND. You can change baud rate settings by soldering J0, J1 and J2 in the appropriate position (Table 1). These jumpers are soldered in logic 1 position by default (9600 bps, software selection enabled). SMD jumper J3 is used to select 5V or 3.3V power supply (default position is 3.3V).

Table 1: Baud Rate selection

Programming

Code examples for IrDA2 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet 1 - MASTER

This example demonstrates the functionality of the IrDA2 Click board.

The master initiates communication with the slave by sending 1 byte of data to the slave.

01 void main() {
02 ANSELC = 0; // Configure ports as digital I/O
03 ANSELD = 0;
04 TRISD = 0; // Set PORTD as output
05 
06 i = 0; // Initialize global variables
07 received = 0;
08 
09 UART1_Init(9600); // Initialize UART module at 9600 baud rate
10 delay_ms(200);
11 
12 RC1IE_bit = 1; // Enable USART Receiver interrupt
13 GIE_bit = 1; // Enable Global interrupt
14 PEIE_bit = 1; // Enable Peripheral interrupt
15 
16 UART1_Write(1); // Master initiates communication
17 
18 while(1) {
19 if (received) { // If data received by Slave
20 LATD = i; // display it on the PORTD
21 i++; // Increment counter
22 received = 0; // Clear received flag
23 }
24 UART1_Write(i); // Send counter value to Slave via UART1
25 delay_ms(200);
26 }
27 }

Code snippet 2 - SLAVE

The slave accepts data, increments it and sends it back to the master.

The data received is shown on PORTD.

01 void main() {
02 ANSELC = 0; // Configure ports as digital I/O
03 ANSELD = 0;
04 TRISD = 0; // Set PORTD as output
05 
06 i = 0; // Initialize global variables
07 received = 0;
08 
09 UART1_Init(9600); // Initialize UART module at 9600 baud rate
10 Delay_ms(200);
11 
12 RC1IE_bit = 1; // Enable USART Receiver interrupt
13 GIE_bit = 1; // Enable Global interrupt
14 PEIE_bit = 1; // Enable Peripheral interrupt
15 
16 while(1) {
17 if (received) { // If data received,
18 LATD = i; // display it on the PORTD
19 i++; // Increment counter
20 received = 0; // Clear received flag
21 UART1_Write(i); // Send counter value to Master via UART1
22 }
23 }
24 }