STM32F4 Discovery and printf() redirection to debug viewer in Keil MDK-ARM

1万 · 2016-8-27 09:07

本帖最后由 huangcunxiake 于 2016-8-27 10:02 编辑

使用Keil开发STM32F4 Discovery板的时候，使用printf函数，并且，输出信息重定向到debuger中的debug viewer中，从而，增加调试手段。

Objective

The ARM Cortex-M architecture includes a facility for sending/receiving user data through special debug ports. This facility is well suited for typical printf() debug practices, where a typical serial port is utiliced. In theses cases, the idea is to write in my program something like this,

[size=1em]

[color=white !important][size=1em]?

#include

voidmain (void) {

printf("Hello, world!");

}

and use the “Debug (printf) viewer” option avaible in Keil MDK-ARM (and other environments) to show a terminal where messages are received. See bellow

These are my notes in order to get this mechanism working on the STM32F4 Discovery kit using the Keil environment.

Some vocabulary.

ITM:

SWV: Serial Wire Viewer

St-Link/V2 upgrade and drivers

The STM32F4 Discovery includes a built-in St-link/v2 debug interface. According with its manual, the SWV facility is available in this interface and the hardware lines are propagated in the schematic of the Discovery kit.

Steps:

1 – Download drivers and utilities from the support page for St-Link/v2 for Windows Xp and 7

2 – Install drivers (?Uninstall previous driver from the control panel)

3- Upgrade St-Link/v2 interface of the discovery running the ST-LinkUpgrade.exe utility

Configuring a Keil project

(But not working completly OK)

Assuming you have a working example for the previous debugger version. (Try to) follow these steps:

1 – Open your project and open the “target options” dialog

2 – Select the second “St-link debugger”

3 – Select “settings” and set options according to the next images.

(Here, be carefull with the speed of the core).

(This a trick for flashing the microcontroller)

1万 · 2016-8-27 09:09

Redirecting/retargeting printf() in my program

Create a C module that includes the following code and add it to your project

复制

/**



   @file

 fputc_debug.c



   @brief

 Trying to redirect printf() to debug port



   @date

 2012/06/25



*/



 



#include

 



#include

 



 



intfputc(intc,

FILE*stream)



{



   return(ITM_SendChar(c));



}

And start playing!

To be solved!!!!

The problem now is that the code is not flashed when entering in debug mode. I follow these steps:

1 – Rebuild completly the project (to avoid that the systems assumes that the build has been done)

2 – Flash the microcontroller with the “load” button

3 – Start debugging

只看该作者 · 2016-8-27 09:48

st-link也可以半主机输出吗？我也试试这个效果如何

1万 · 2016-8-27 10:02

半主机输出是啥意思。