This is a sample application using STM32F4 Discovery board connect with ESP-12-Q module using IAR workbench
| Pin | State |
|---|---|
| VCC | 3.3 V |
| GND | 0 V |
| EN | High |
| GPIO 0 | High |
| GPIO 15 | Gnd |
The board is connected using UART 2
| Pin | State |
|---|---|
| GPIOA_2 | ESP8266_RX |
| GPIOA_3 | ESP8266_TX |