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

# Note 16: BLE (lower/stm32/12)

## Projects

| # | Directory | Description |
|---|---|---|
| 12 | `12_ble_server_hal` | BLE Server (ESP32-C3) |

## Code Accuracy Audit

### Path Audit

| Claimed Path | Actual Path | Status |
|---|---|---|
| `stm32/12_ble_server_hal/Core/Src/main.c` | `12_ble_server_hal/Core/Src/main.c` | ✅ Correct |
| `stm32/12_ble_server_hal/App/BLE/ble.h` | `12_ble_server_hal/App/BLE/ble.h` | ✅ Correct |
| `stm32/12_ble_server_hal/App/BLE/ble.c` | `12_ble_server_hal/App/BLE/ble.c` | ✅ Correct |

### BLE Init Sequence (ble.c)

Note claims exact AT command sequence:

| AT Command | Actual Code Line | Match? |
|---|---|---|
| `AT+BLEINIT=2\r\n` | Line 18 | ✅ Match |
| `AT+BLEGATTSSRVCRE\r\n` | Line 23 | ✅ Match |
| `AT+BLEGATTSSRVSTART\r\n` | Line 28 | ✅ Match |
| `AT+BLEADDR?\r\n` | Line 33 | ✅ Match |
| `AT+BLEADVPARAM=50,50,0,0,7,0\r\n` | Line 38 | ✅ Match |
| `AT+BLEADVDATAEX=\"atguigu-ble\",\"A123\",\"0102030405\",1\r\n` | Line 43 | ✅ Match |
| `AT+BLEADVSTART\r\n` | Line 48 | ✅ Match |
| `AT+BLESPPCFG=1,1,7,1,5\r\n` | Line 53 | ✅ Match |
| `AT+SYSMSG=4\r\n` | Line 58 | ✅ Match |

### BLE Data Functions

| Claimed by Note | Actual Code | Match? |
|---|---|---|
| `BLE_SendData`: `HAL_UART_Transmit(&huart2, txBuff, txLen, 1000)` | Line 66 | ✅ Match |
| `BLE_ReadData`: `HAL_UARTEx_ReceiveToIdle(&huart2, rxBuff, 1024, rxLen, 1000)` | Line 76 | ✅ Match |
| If `*rxLen == 0` return immediately | Lines 79-82 | ✅ Match |
| Call `BLE_IsConnChanged(rxBuff)`; if true, set `*rxLen = 0` | Lines 85-88 | ✅ Match |

### Connection Detection (BLE_IsConnChanged)

| Claimed by Note | Actual Code | Match? |
|---|---|---|
| `strstr((char *)msg, "+BLECONN:") != NULL` → send `AT+BLESPP\r\n` | Lines 94-98 | ✅ Match |
| `strstr((char *)msg, "+BLEDISCONN:") != NULL` → send `+++` and delay 2000ms | Lines 104-109, 112 | ✅ Match |
| `strstr(... "WIFI CONNECTED" ...)` → return 1 | Line 118 | ✅ Match |
| `strstr(... "WIFI GOT IP" ...)` → return 1 | Line 119 | ✅ Match |
| `strstr(... "+DIST_STA_IP:" ...)` → return 1 | Line 120 | ✅ Match |

### BLE main.c

Note does not detail main.c, but actual code shows:
- `BLE_Init()` called once
- Infinite loop: `BLE_ReadData()`, if data received, `BLE_SendData()` to echo back
- Standard echo server pattern

## Summary

**Overall Accuracy**: Excellent (99%+)

**Issues Found**: None significant. All AT commands, data functions, and connection detection logic match the actual source code perfectly. This is the most accurate note among the 8 reviewed.