显示调试过程中的printf IDE信息 [英] Show printf messages in IDE during debug
问题描述
我们有一个设备，我想使用printf函数将消息发送到IDE中进行调试。设置：
We have a device and I'd like to use printf function to send messages to the IDE for debugging purposes. The setup:
-
ARM Cortex-M3的设备
ARM Cortex-M3 device
ULINK2接口
uVision4 IDE
uVision4 IDE
我跟着
首先，我修改了retarget.c中的文件，将输出重定向到的 ITM 接口：
I've followed the instructions available in this link to be able to see the messages in the "Debug (printf) Viewer". First I modified the "retarget.c" file, to redirect the output to the ITM interface:
#include <stdio.h>
#include <rt_misc.h>
#pragma import(__use_no_semihosting_swi)
// Para utilização do saida de debug através do ULINK2
#define ITM_Port8(n) (*((volatile unsigned char *)(0xE0000000+4*n)))
#define ITM_Port16(n) (*((volatile unsigned short*)(0xE0000000+4*n)))
#define ITM_Port32(n) (*((volatile unsigned long *)(0xE0000000+4*n)))
#define DEMCR (*((volatile unsigned long *)(0xE000EDFC)))
#define TRCENA 0x01000000
struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
// Escreve caractere na porta de Debug
int sendchar (int ch) {
if (DEMCR & TRCENA) {
while (ITM_Port32(0) == 0);
ITM_Port8(0) = ch;
}
return(ch);
}
int fputc(int ch, FILE *f) {
return (sendchar(ch));
}
int ferror(FILE *f) {
/* Your implementation of ferror */
return EOF;
}
void _ttywrch(int ch) {
sendchar(ch);
}
void _sys_exit(int return_code) {
label: goto label; /* endless loop */
}
然后我配置了uVision4的IMT，以下的说明：
Then I configured the IMT in the uVision4, following the instructions:
该项目编译罚款。我的应用程序下载到设备上，并开始与uVision4我调试会话。我尝试在main函数用printf用一个简单的信息，系统初始化之后，但调试器保持为空。
我已经把断点诠释了sendchar功能，我可以看到，所有的线都命中，符合市场预期。
The project compiles fine. I download the application to the device and start I debug session with uVision4. I try to use printf with a simple message in the main function, right after the system initialization, but the Debug Viewer remains empty. I've put breakpoints int the "sendchar" function, I can see that all lines are hit, as expected.
有没有人用printf与ULINK2和uVision4成功了吗？有没有人有，为什么我看不到在调试器窗口的任何输出线索？
Has anyone succeeded using printf with ULINK2 and uVision4? Does anyone has a clue on why I can't see any output in the Debug Viewer window?
更新
我试图使用现有的ITM功能，导致一个简单的retarget.c中
I've tried to use the existing ITM functions, resulting in a simpler "retarget.c":
int fputc(int ch, FILE *f) {
return (ITM_SendChar((uint32_t)ch));
}
然而，没有输出显示在调试器。当我踏上过的printf funcion电话，跟踪：数据溢出显示在IDE的底部，其次是跟踪：通信错误。
Nevertheless, no output is shown in the Debug Viewer. When I step over the printf funcion call, "Trace: Data Overflow" is displayed in the bottom of the IDE, followed by "Trace: Communication Error".
推荐答案
的问题是在跟踪配置CoreClock字段。它不匹配器件的时钟。之后，我改变了它的设备时钟匹配，右输出被显示在浏览器的调试。
The problem was in the "CoreClock" field in the "Trace" configuration. It didn't match the device's clock. After I changed it to match the device clock, the right output was shown in the Debug Viewer.
一些有用的链接：
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