JLink OB SWI 取代串口打印的方式
作者：互联网
1:debug的串口被占用
2:从Keil 迁移到的LINUX下开发.
3:手上只有JLinkOB,(4线:CLK,SWIO,GND,RST)
4:设备只引出了4线(SWO 没接出)
环境:
JLink版本: 执行 JLinkExe 命令会先显示版本信息
SEGGER J-Link Commander V6.56a (Compiled Nov 25 2019 16:58:42)
DLL version V6.56a, compiled Nov 25 2019 16:58:26
Host: Ubuntu 16.04
A:找到JLINK 安装时的exmaple 和 RTT相关的头文件
路径:/opt/SEGGER/JLink_V656a/Samples/SEGGER_RTT_V656a.tgz
解压出来就好
B:使用,复制路径下的RTT文件夹和Syscalls文件夹下的文件到工程目录,makefile增加对应的源文件
C:编译可能报错: xxxxx87:5: error: conflicting types for '_write_r' xxxxx
原因,是arm-gcc版本造成的,修改报错的地方的 _write_r(在 reent.h中161行) 的声明即可
修改如下
1 //extern _ssize_t _write_r _PARAMS ((struct _reent *, int, const void *, size_t)); 2 extern int _write_r(struct _reent *r, int file, const void *ptr, int len);
再编译即可.
D: 实现打印:
打印代码如下:
//main.c
#include <stdio.h>
#include "SEGGER_RTT.h"
void main(){
/*HAL init 之类的初始化*/
SEGGER_RTT_ConfigUpBuffer(0, NULL, NULL, 0, SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL);
SEGGER_RTT_printf(0, "printf Test: %%c, 'S' : %c.\r\n", 'S');
while(1){
}
}
E:运行:
1:先运行 JLinkExe -Device STM32FXXXX -Speed 4000 -If SWD
2:connect
3:r
4:另起窗口运行 JLinkRTTClient
5:回到JLink的窗口 运行 go
操作如下:
JLinkExe -Device STM32F446RE -Speed 4000 -If SWD SEGGER J-Link Commander V6.56a (Compiled Nov 25 2019 16:58:42) DLL version V6.56a, compiled Nov 25 2019 16:58:26 Connecting to J-Link via USB...O.K. Firmware: J-Link OB-STM32F072-CortexM compiled Mar 8 2020 11:15:54 Hardware version: V1.00 S/N: -1 License(s): GDB, RDI, FlashBP, FlashDL, JFlash, RDDI VTref=3.300V Type "connect" to establish a target connection, '?' for help J-Link>connect Device "STM32F446RE" selected. Connecting to target via SWD Found SW-DP with ID 0x2BA01477 Found SW-DP with ID 0x2BA01477 Scanning AP map to find all available APs AP[1]: Stopped AP scan as end of AP map has been reached AP[0]: AHB-AP (IDR: 0x24770011) Iterating through AP map to find AHB-AP to use AP[0]: Core found AP[0]: AHB-AP ROM base: 0xE00FF000 CPUID register: 0x410FC241. Implementer code: 0x41 (ARM) Found Cortex-M4 r0p1, Little endian. FPUnit: 6 code (BP) slots and 2 literal slots CoreSight components: ROMTbl[0] @ E00FF000 ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7 ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM Cortex-M4 identified. J-Link>r Reset delay: 0 ms Reset type NORMAL: Resets core & peripherals via SYSRESETREQ & VECTRESET bit. Reset: Halt core after reset via DEMCR.VC_CORERESET. Reset: Reset device via AIRCR.SYSRESETREQ. J-Link>go
JLinkRTTClient ###RTT Client: ************************************************************ ###RTT Client: * SEGGER Microcontroller GmbH * ###RTT Client: * Solutions for real time microcontroller applications * ###RTT Client: ************************************************************ ###RTT Client: * * ###RTT Client: * (c) 2012 - 2016 SEGGER Microcontroller GmbH * ###RTT Client: * * ###RTT Client: * www.segger.com Support: support@segger.com * ###RTT Client: * * ###RTT Client: ************************************************************ ###RTT Client: * * ###RTT Client: * SEGGER J-Link RTT Client Compiled Nov 25 2019 16:59:02 * ###RTT Client: * * ###RTT Client: ************************************************************ ###RTT Client: ----------------------------------------------- ###RTT Client: Connecting to J-Link RTT Server via localhost:19021 ... ###RTT Client: Connected. SEGGER J-Link V6.56a - Real time terminal output J-Link OB-STM32F072-CortexM compiled Mar 8 2020 11:15:54 V1.0, SN=-1 Process: JLinkExe printf Test: %c, 'S' : S.
剩下问题:
启动JLinkRTT Logger 失败问题
标签：SWI,AP,SEGGER,OB,RTT,Client,Link,串口,### 来源： https://www.cnblogs.com/CXianRen/p/12198943.html