---
tags: [source-summary]
type: source
source: "STM32 Lower Part Code Accuracy Audit: Notes 13-20"
author: "Code Audit"
date: 2026-07-16
created: 2026-07-16
---

# STM32 Lower Part Notes 13-20: Code Accuracy Audit Report

## Summary

Comprehensive audit comparing raw Joplin notes for STM32 lower-part topics (13-20) against actual source files at `F:\Baidu\尚硅谷\尚硅谷嵌入式技术STM32单片机\下部-高级篇\3-代码\stm32\`.

## Overall Findings

| Note | Topic | Accuracy | Issues |
|---|---|---|---|
| [[Note 13 CAN]] | CAN | 95% | 1 critical path error |
| [[Note 14 Ethernet]] | Ethernet | 95% | 1 critical path error |
| [[Note 15 WiFi]] | WiFi | 90% | 1 ambiguity |
| [[Note 16 BLE]] | BLE | 99% | None significant |
| [[Note 17 LoRa]] | LoRa | 98% | None significant |
| [[Note 18 Power]] | Power | 95% | PVD code not in projects |
| [[Note 19 BKP RTC]] | BKP/RTC | 99% | None significant |
| [[Note 20 Watchdog]] | Watchdog | 90% | 1 timeout calculation error |

## Critical Issues Found

### Issue 1: Double `stm32/stm32/` Path Prefix (Notes 13-14)

Raw notes use paths like `stm32/stm32/01_can_test_register/...` with **duplicated `stm32/` prefix**. Correct: `01_can_test_register/...`

### Issue 2: IWDG Timeout Formula Error (Note 20)

Raw note shows `Tout = 2500 × 64 × 4 / 40000 = 16s` — the extra ×4 is wrong. Correct: `Tout = 2500 × 64 / 40000 = 4s`

### Issue 3: Project Ambiguity (Note 15)

TCP server functionality is in project **11** (`11_wifi_tcp_server_hal`), not project **10** (`10_wifi_test_hal`, which only sends AT+GMR).

### Issue 4: PVD Code Not in Projects (Note 18)

PVD configuration described in note does not exist in any of the 6 power project main.c files (15-20).

## File Verification

| Critical File | Lines | Status |
|---|---|---|
| `01_can_test_register/Hardware/CAN/can.c` | 200 | ✅ All register ops match |
| `01_can_test_register/Hardware/CAN/can.h` | 30 | ✅ RxMsg struct matches |
| `02_can_test_hal/Core/Src/can.c` | 195 | ✅ HAL init/filter/send/recv match |
| `05_ethernet_test_register/Hardware/SPI/spi.c` | 93 | ✅ SPI2 config matches |
| `05_ethernet_test_register/Interface/Ethernet/eth.c` | 85 | ✅ W5500 init matches |
| `10_wifi_test_hal/Interface/ESP32/esp32.c` | 52 | ✅ AT cmd driver matches |
| `12_ble_server_hal/App/BLE/ble.c` | 127 | ✅ All AT sequences match |
| `13_lora_node_hal/Interface/LoRa/lora.c` | 394 | ✅ LLCC68 driver matches |
| `15_lowpower_sleep_register/User/main.c` | 49 | ✅ Sleep mode code matches |
| `25_rtc_calendar_register/Hardware/RTC/rtc.c` | 139 | ✅ RTC register ops match |
| `27_iwdg_test_register/Hardware/IWDG/iwdg.c` | 33 | ✅ IWDG register ops match |

## Wiki Notes Created

- [[Note 13 CAN]]
- [[Note 14 Ethernet]]
- [[Note 15 WiFi]]
- [[Note 16 BLE]]
- [[Note 17 LoRa]]
- [[Note 18 Power]]
- [[Note 19 BKP RTC]]
- [[Note 20 Watchdog]]