MIKROE-2542

WiFi ESP click PID: MIKROE-2542   WiFi ESP click carries the ESP-WROOM-02 module that integrates ESP8266EX. The click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over UART interface and the following pins on the mikroBUS™ line: RST, CS. Access point and WiFi client mode WiFi ESP click can function in both AP (Access Point) WiFi mode, as well as in WiFi client mode. The click brings easy implementation and usage. The module supports the following network protocols: IPv4/TCP/UDP/HTTP/FTP. Thanks to this the click can operate as a client device requesting a file from a file server device (FTP - file transfer protocol) in local network systems, or request a web page via internet (IP/TCP/HTTP). It can also be used as a small web server, for example a wireless weather station prototype, etc. Station mode is default when the click is in WiFi client mode. ESP‐WROOM‐02 module features ESP-WROOM-02 carries ESP8266EX highly integrated Wi-Fi SoC solution to meet the continuous demands for efficient power usage, compact design and reliable performance in the industry. Besides the Wi-Fi functionalities, ESP8266EX integrates an enhanced version of Tensilica’s L106 Diamond series 32-bit processor and on-chip SRAM. As well as antenna switches, RF balun, power amplifier, low noise receiver amplifier, filters and power management modules. With the complete and self-contained Wi-Fi networking capabilities, it can perform as either a standalone application (WROOM module itself) or the slave to an MCU host which is the primary intention of the click board as a whole. So, this click board is applied to any microcontroller design as a Wi-Fi adaptor through UART interface (RX,TX lines on mikroBUS pin socket). For more information see the datasheet.    http://www.espressif.com/sites/default/files/documentation/0c-esp-wroom-02_datasheet_en.pdf  Advanced usage There are additional pad headers onboard (HSPI/GPIO interface of the module) for advanced usage. For more information see the Documentation tab. Key features     ESP‐WROOM‐02 module   o 802.11 b/g/n  o Protocols: IPv4/TCP/UDP/HTTP/FTP  o Frequency range: 2.4 GHz ~ 2.5 GHz  o 32‐bit processor  o on chip SRAM  PCB antenna  UART interface  3.3V power supply  Product Type Applications MCU Key Features Wi-Fi Create smart appliances, home automation systems, wireless data loggers, etc ESP-WROOM-02 Protocols: IPv4, TCP/UDP/HTTP/FTP, 802.11 b/g/n standard, UART interface, 3.3V power supply Key Benefits Interface Power Supply Compatibility Click board size The click can function in both AP mode and WiFi client mode UART 3.3V mikroBUS M (42.9 x 25.4 mm) Pinout diagram This table shows how the pinout on WiFi ESP click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes    Pin  Pin Notes  mikroBUStm  Not connected  NC  1  AN  PWM 16 NC Not connected  HW Reset  RST  2  RST  INT  15 NC Not connected  Chip enable (active  EN  3  CS  high)  TX  14 TX  UART0_TXD / Transmit end in UART download  (program) mode  Not connected  NC  4  SCK  RX  13 RX UART0_RXD / Receive end in UART download  (program) mode  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   Additional pins Name  I/O  CLK  Description  IO  HSPI_CLK / GPIO14  SDO  IO  HSPI_MISO / GPIO12  SDI  IO  HSPI_MOSI / GPIO13  CS  IO  HSPI_CS / GPIO15  IO0  IO  GPIO0 (UART download mode ‐ pull down, Flash boot ‐ pull up) GND  GND    Buttons and LEDs Designator  Name  Type (LED, BUTTON…) LD1  PWR  LED  Description  Power Supply ON Programming Code examples for WiFi ESP click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet This code snippet configures GPIO ports, initializes the display and prepares the WiFi module. In an endless loop, LED is enabled or disabled by a button, and that information is then sent to the server. 01 void main() { 02 03 // Initialize variables 04 length = 0; 05 state = 0; 06 response_rcvd = 0; 07 responseID = 0; 08 response = 0; 09 i = 0; 10 11 // GPIO Direction 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 GPIO_Digital_Input( &GPIOA_IDR, _GPIO_PINMASK_4 ); GPIO_Digital_Output( &GPIOD_BASE, _GPIO_PINMASK_13 ); GPIO_Digital_Output( &GPIOC_BASE, _GPIO_PINMASK_2 ); GPIO_Digital_Output( &GPIOA_ODR, _GPIO_PINMASK_0 ); // UART Initialization UART3_Init_Advanced( 115200, _UART_8_BIT_DATA, _UART_NOPARITY, _UART_ONE_STOPBIT, &_GPIO_MODULE_USART3_PD89); // Enable Interrupts RXNEIE_USART3_CR1_bit = 1; NVIC_IntEnable( IVT_INT_USART3 ); EnableInterrupts(); display_init(); // Initialize WiFI module WiFi_Init(); // Setting WiFi Mode - SoftAP + station mode WiFI_Configure(); state = 100; i = 0; TFT_Write_Text("Please connect to your STAIP...", 50, 100); Delay_ms(20000); WiFi3_Send(); TFT_Write_Text("Entering button toggling loop.", 50, 150); LED_switching = 1; while( 1 ) { // detect logical one on PA4 pin if (Button(&GPIOA_IDR, 4, 1, 1)) { oldstate_A4 = 1; } // detect logical one-to-zero transition on PA4 pin if (oldstate_A4 && Button(&GPIOA_IDR, 4, 1, 0)) { if ( !strcmp(txt_state_A0, "OFF " )) 57 58 ", 8 ); 59 60 61 62 63 ", 8 ); 64 65 66 67 68 69 } 70 } 71 } { strncpy( txt_state_A0, "ON GPIOA_ODR.B0 = 1; } else { strncpy( txt_state_A0, "OFF GPIOA_ODR.B0 = 0; } oldstate_A4 = 0; A0_change = true; WiFi3_Send(); https://shop.mikroe.com/click/wireless-connectivity/wifi-esp 3/21/2017