添加 使用 SEGGER J-Link RTT.
Signed-off-by: lion.chan <cy187lion@sina.com>
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layout: post
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title: "使用 SEGGER J-Link RTT"
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subtitle: "基于 Keil 环境"
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description: "对在 Keil 环境下使用 SEGGER J-Link RTT 功能进行了介绍，并对常见编译错误进行了修正。"
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excerpt: "对在 Keil 环境下使用 SEGGER J-Link RTT 功能进行了介绍，并对常见编译错误进行了修正。"
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date: 2022-09-16 17:09:00
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author: "Rick Chan"
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tags: ["Development", "RTT", "J-Link", "SEGGER", "Keil"]
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categories: ["Software"]
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published: true
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math: false
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---
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- [1. 工程配置](#1-工程配置)
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- [2. 代码修正](#2-代码修正)
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- [3. 工具使用](#3-工具使用)
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- [4. 外部参考资料](#4-外部参考资料)
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With RTT it is possible to output information from the target microcontroller as well as sending input to the application at a very high speed without affecting the target's real time behavior. SEGGER RTT can be used with any J-Link model and any supported target processor which allows background memory access, which are Cortex-M and RX targets.
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## 1. 工程配置
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首先需要向工程添加 RTT 支持代码，可以在 \<J-Link 安装目录>/Samples/RTT 下找到该代码。
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在 Keil 中创建 SEEGER 分组，添加 RTT 源码中的 SEGGER_RTT.h、SEGGER_RTT.c、SEGGER_RTT_printf.c 和 SEGGER_RTT_Conf.h 文件。使用以下函数初始化并打印信息：
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```cpp
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int main(void) {
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// ...
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SEGGER_RTT_ConfigUpBuffer(0, "RTTUP", NULL, 0, SEGGER_RTT_MODE_NO_BLOCK_SKIP);
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SEGGER_RTT_ConfigDownBuffer(0, "RTTDOWN", NULL, 0, SEGGER_RTT_MODE_NO_BLOCK_SKIP);
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SEGGER_RTT_SetTerminal(0);
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SEGGER_RTT_printf(0, "V\r\n");
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// ...
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}
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```
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其中 SEGGER_RTT_SetTerminal() 用于选择终端编号 SEGGER J-Link RTT 支持多个终端。
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## 2. 代码修正
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如果 Keil 中使能了 **GNU extensions** 选项，编译 RTT 代码时会出现类似如下错误：
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```bash
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warning: #47-D: incompatible redefinition of macro "SEGGER_RTT_LOCK" (declared at line 199)
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warning: #47-D: incompatible redefinition of macro "SEGGER_RTT_UNLOCK" (declared at line 200)
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```
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这是因为使能 **GNU extensions** 后同时开启了“\_\_CC_ARM” 和 “\_\_GUNC\_\_”宏，导致 SEGGER_RTT_Conf.h 文件中的 SEGGER_RTT_LOCK 和 SEGGER_RTT_UNLOCK 宏重复定义。
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此时需要修改 SEGGER_RTT_Conf.h 文件如下：
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```cpp
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/*********************************************************************
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*
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* RTT lock configuration for SEGGER Embedded Studio,
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* Rowley CrossStudio and GCC
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*/
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#if (defined __SES_ARM) || (defined __CROSSWORKS_ARM) || ((defined __GNUC__) && !(defined(__CC_ARM)))
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```
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## 3. 工具使用
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需要使用 **J-Link RTT Viewer** 工具来查看 RTT 的输出（有些环境下需要先连接该工具再在 IDE 中进行调试）。
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打开 **J-Link RTT Viewer**，根据实际情况选择 J-Link 的连接方式，然后选择目标设备，如 STM32F407 等，然后选择 SWD 或 JTAG 接口，并设置速率，点击“OK”继续，若出现类似如下日志，则连接成功。
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```bash
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LOG: Terminal 0 added.
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LOG: Device "N32L406CB" selected.
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LOG: Found SW-DP with ID 0x2BA01477
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LOG: Scanning AP map to find all available APs
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LOG: AP[1]: Stopped AP scan as end of AP map has been reached
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LOG: AP[0]: AHB-AP (IDR: 0x24770011)
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LOG: Iterating through AP map to find AHB-AP to use
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LOG: AP[0]: Core found
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LOG: AP[0]: AHB-AP ROM base: 0xE00FF000
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LOG: CPUID register: 0x410FC241. Implementer code: 0x41 (ARM)
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LOG: Found Cortex-M4 r0p1, Little endian.
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LOG: FPUnit: 6 code (BP) slots and 2 literal slots
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LOG: CoreSight components:
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LOG: ROMTbl[0] @ E00FF000
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LOG: ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
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LOG: ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT
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LOG: ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB
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LOG: ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM
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LOG: ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU
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LOG: ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM
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LOG: RTT Viewer connected.
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```
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在 Terminal 菜单中可选择“Add next terminal”，则会出现“Terminal 0”、“Terminal 1”等，代码中使用 SEGGER_RTT_SetTerminal() 函数选择好输出终端后，日志将被输出到对应编号的 Terminal 中。
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最后，在 IDE 中进行调试，或全速运行，RTT 终端中就会产生响应输出。
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SEGGER_RTT_printf() 的用法与 printf() 用法类似，注意换行使用 “\r\n”。
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## 4. 外部参考资料
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1. [SEGGER调试利器RTT，替代串口，高速数据上传](https://blog.csdn.net/qlexcel/article/details/126633180)
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2. [编译SeggerRTT报错: warning: #47-D: incompatible redefinition of macro "SEGGER_RTT_LOCK"](https://blog.csdn.net/weixin_39752827/article/details/88708626)
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