---
tags: [entity]
type: entity
topic: stm32-lower
note: 17
created: 2026-07-16
updated: 2026-07-16
---

# Note 17: LoRa (lower/stm32/13~14)

## Projects

| # | Directory | Description |
|---|---|---|
| 13 | `13_lora_node_hal` | LoRa Node (LLCC68) |
| 14 | `14_lora_gateway_hal` | LoRa Gateway |

## Code Accuracy Audit

### Path Audit

| Claimed Path | Actual Path | Status |
|---|---|---|
| `stm32/13_lora_node_hal/Core/Src/main.c` | `13_lora_node_hal/Core/Src/main.c` | ✅ Correct |
| `stm32/13_lora_node_hal/Interface/LoRa/lora.c` | `13_lora_node_hal/Interface/LoRa/lora.c` | ✅ Correct |
| `stm32/13_lora_node_hal/Interface/LoRa/lora.h` | `13_lora_node_hal/Interface/LoRa/lora.h` | ✅ Correct |
| `stm32/14_lora_gateway_hal/Core/Src/main.c` | `14_lora_gateway_hal/Core/Src/main.c` | ✅ Correct |

### LoRa Init (lora.c)

Note claims `LoRa_Init` uses `DRIVER_LLCC68_LINK_INIT` macros and `llcc68_init` → All match actual code (394-line file).

| Claimed Parameter | Actual Value | Match? |
|---|---|---|
| `LLCC68_LORA_DEFAULT_SF` = SF9 | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_BANDWIDTH` = 125 KHz | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_CR` = CR 4/5 | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_TX_DBM` = 17 dBm | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_RF_FREQUENCY` = 480000000 | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_SYNC_WORD` = 0x3444 | `lora.h` define | ✅ Match |
| `LLCC68_LORA_DEFAULT_PREAMBLE_LENGTH` = 12 | `lora.h` define | ✅ Match |

### LoRa Send/Receive

| Claimed by Note | Actual Code | Match? |
|---|---|---|
| `TXEN_HIGH; RXEN_LOW;` before send | Present in lora.c | ✅ Match |
| `TXEN_LOW; RXEN_HIGH;` for RX mode | Present in lora.c | ✅ Match |
| `llcc68_lora_transmit(...)` for send | Present | ✅ Match |
| `llcc68_continuous_receive(...)` for RX | Present | ✅ Match |
| `llcc68_irq_handler(&gs_handle)` then memcpy | Present | ✅ Match |
| GPIO EXTI callback for key press | In main.c | ✅ Match |

### Node main.c logic

Note claims:
- Key press triggers send ("一个普通LoRa节点")
- RX mode by default
- Gateway echoes back on receive

All match actual code.

## Summary

**Overall Accuracy**: Very High

**Issues Found**: None significant. All parameters, functions, and driver call sequence match the actual code.