---
tags: [entity]
type: entity
topic: stm32-lower
note: 15
created: 2026-07-16
updated: 2026-07-16
---

# Note 15: WiFi (lower/stm32/10~11)

## Projects

| # | Directory | Description |
|---|---|---|
| 10 | `10_wifi_test_hal` | WiFi AT command test |
| 11 | `11_wifi_tcp_server_hal` | WiFi TCP Server |

## Code Accuracy Audit

### Path Audit

| Claimed Path | Actual Path | Status |
|---|---|---|
| `stm32/10_wifi_test_hal/Core/Src/main.c` | `10_wifi_test_hal/Core/Src/main.c` | ✅ Correct |
| `stm32/10_wifi_test_hal/Interface/ESP32/esp32.c` | `10_wifi_test_hal/Interface/ESP32/esp32.c` | ✅ Correct |
| `stm32/11_wifi_tcp_server_hal/Core/Src/main.c` | `11_wifi_tcp_server_hal/Core/Src/main.c` | ✅ Correct |
| `stm32/11_wifi_tcp_server_hal/App/WIFI/wifi.c` | `11_wifi_tcp_server_hal/App/WIFI/wifi.c` | ✅ Correct |

### ESP32 Driver (10_wifi_test_hal/Interface/ESP32/esp32.c)

| Claimed by Note | Actual Code | Match? |
|---|---|---|
| `MX_USART2_UART_Init()` | Line 18 | ✅ Match |
| `uint8_t *cmd = "AT+RST=0\r\n"` | Line 21 | ✅ Match |
| `ESP32_SendCmd(cmd, strlen((char *)cmd))` | Line 22 | ✅ Match |
| `HAL_Delay(2000)` | Line 25 | ✅ Match |
| `memset(respBuff, 0, 1024)` | Line 32 | ✅ Match |
| `HAL_UART_Transmit(&huart2, cmd, cmdLen, 1000)` | Line 35 | ✅ Match |
| `do { ESP32_ReadResp(...) } while (strstr(..., "OK") == NULL)` | Lines 38-41 | ✅ Match |
| `printf("%.*s\n", respLen, respBuff)` | Line 44 | ✅ Match |
| `HAL_UARTEx_ReceiveToIdle(&huart2, buff, 1024, len, 1000)` | Line 51 | ✅ Match |
| Global: `uint8_t respBuff[1024]; uint16_t respLen;` | Lines 11-12 | ✅ Match |

### WiFi main.c (10_wifi_test_hal)

Note says main.c includes TCP server logic. **Actual main.c (10_wifi_test_hal)** only sends basic AT commands:
```c
ESP32_Init();
ESP32_SendCmd("AT\r\n", ...);
ESP32_SendCmd("AT+GMR\r\n", ...);
```
The TCP server logic lives in **project 11** (`11_wifi_tcp_server_hal`), not project 10.

**Discrepancy**: The note may have merged project 10 and 11 behavior. Project 10 is just a basic AT command test.

### WiFi TCP Server (11_wifi_tcp_server_hal/App/WIFI/wifi.c)

Note claims:
- `WIFI_Init(AP)` → sets AP mode with AT+CWMODE=2, AT+CWSAP, AT+CIPAP
- `WIFI_TCP_ServerStart()` → AT+CIPMUX=1, AT+CIPSERVER=1,8080, AT+CIPDINFO=1
- `WIFI_TCP_SendData` → sprintf AT+CIPSEND, then HAL_UART_Transmit
- `WIFI_TCP_ReadData` → sscanf to parse +IPD format

All match actual code. The `+IPD` parsing via `sscanf` is correctly captured.

## Summary

**Overall Accuracy**: High

**Issues Found**:
1. Note may be ambiguous about whether project 10 or 11 contains the TCP server code — project 10 (main.c) only does basic AT testing; TCP server logic is in project 11
2. All ESP32 driver code in `esp32.c` matches perfectly