WiFi 4 click

WiFi 4 click carries SPWF01SA, a complete standalone WiFi module with a single-chip 802.11 b/g/n transceiver, a 32-bit STM32 MCU, along with a built-in 2.4 GHz ISM band antenna.

The click is designed to run on a 3.3V power supply. It communicates with the target MCU over an UART interface (with additional functionality provided by Reset and Ready To Send pins, in place of default mikroBUS™ RST and CS pins).

SPWF01SA module

The SPWF01SA module has 1.5 MB of internal flash and 64 KB of RAM, and can achieve up to +18 dBm of output power.

In standby mode the module uses only 34 uA, while in sleep mode the typical power consumption is 15 mA.

Additional GPIO pins

The 14 additional GPIO pins that line the edges of the board have alternate functions like SPI, ADC, I2C, DAC (although access to those functions depends on the firmware version loaded in the module).

Key features

• SPWF01SA module
  • 1.5 MB of internal flash memory
  • 64 KB of RAM memory
  • Integrated TCP/IP protocol stack
  • WEP/WPA/WPA2 personal security
• Additional 14 GPIO pins
• Interface: UART
• 3.3V power supply

Specification

Pinout diagram

This table shows how the pinout on WiFi 4 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin	mikroBUStm				Pin	Notes
Not connected	NC	1	AN	PWM	16	NC	Not connected
Reset input	nRESET	2	RST	INT	15	CTSb	UART Clear to send input
UART Request to send output	RTSb	3	CS	TX	14	TXD	UART Transmit data output
Not connected	NC	4	SCK	RX	13	RXD	UART Receive data input
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	NC	Not connected
Ground	GND	8	GND	GND	9	GND	Ground

Programming

This code snippet is a demonstration on how to connect to wireless network router and start a simple web server.

It is necessary that your WIFi router has the DHCP turned on.

01 void main() 
02 {
03 // initialize uart, timer, WiFi, TFT
04 initMCU();
05 
06 // connect to the network
07 netReady = 0;
08 TFT_Write_Text( "Connecting to network...", 80 , 120 );
09 
10 // Connect to network
11 if(( wifiTest = Net_Wireless_SPWF01S_ConnectToAP( "SSID", "password", 0 )) == _NET_WIRELESS_SPWF01S_OK ) 
12 {
13 // wait for WiFi to be up
14 while( netReady == 0 )
15 ;
16 
17 TFT_Write_Text( "Connected!", 80 , 140 );
18 
19 // Create webpage
20 Net_Wireless_SPWF01S_MakeFile( "index.html", html );
21 Net_Wireless_SPWF01S_MakeFile( "layout.css", layout );
22 Net_Wireless_SPWF01S_MakeFile( "logic.js", js );
23 
24 // Get IP address
25 Net_Wireless_SPWF01S_GetCurrentIP( ipAddr );
26 
27 // Convert IP address to string
28 ConvertIPtoString();
29 
30 // Display IP address
31 TFT_Write_Text( "The IP address is :", 80 , 170 );
32 TFT_Write_Text( IPAdrStr, 195 , 170 );
33 }