SEGGER RTT默认是不支持浮点打印的，简单的点，可以自己封装下做支持

eric2013 · 发表于 2020-8-23 10:16:48

封装printf，代码如下：

#include "SEGGER_RTT.h"
#include "__libc.h"
#include <stdarg.h>
#include <stdio.h>
int printf(const char *fmt,...) {
char buffer[128];
va_list args;
va_start (args, fmt);
int n = vsnprintf(buffer, sizeof(buffer), fmt, args);
SEGGER_RTT_Write(0, buffer, n);
va_end(args);
return n;
}
int puts(const char *s) {
return SEGGER_RTT_WriteString(0, s);
}
int __putchar(int x, __printf_tag_ptr ctx) {
(void)ctx;
SEGGER_RTT_Write(0, (char *)&x, 1);
return x;
}
int __getchar() {
return SEGGER_RTT_WaitKey();
}

复制代码

wdliming · 发表于 2020-8-23 20:33:17

谢谢

wdliming · 发表于 2020-8-23 20:33:35

请问这个ac6可以使用吗？

eric2013 · 发表于 2020-8-24 06:56:29

wdliming 发表于 2020-8-23 20:33
请问这个ac6可以使用吗？

可以。直接sprintf转换成字符后发送即可

挖东衣宇 · 发表于 2020-8-24 16:33:19

搬运

/*********************************************************************
* SEGGER Microcontroller GmbH & Co. KG *
* The Embedded Experts *
**********************************************************************
* *
* (c) 2014 - 2017 SEGGER Microcontroller GmbH & Co. KG *
* *
* www.segger.com Support: support@segger.com *
* *
**********************************************************************
* *
* SEGGER RTT * Real Time Transfer for embedded targets *
* *
**********************************************************************
* *
* All rights reserved. *
* *
* SEGGER strongly recommends to not make any changes *
* to or modify the source code of this software in order to stay *
* compatible with the RTT protocol and J-Link. *
* *
* Redistribution and use in source and binary forms, with or *
* without modification, are permitted provided that the following *
* conditions are met: *
* *
* o Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* *
* o Redistributions in binary form must reproduce the above *
* copyright notice, this list of conditions and the following *
* disclaimer in the documentation and/or other materials provided *
* with the distribution. *
* *
* o Neither the name of SEGGER Microcontroller GmbH & Co. KG *
* nor the names of its contributors may be used to endorse or *
* promote products derived from this software without specific *
* prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
* DISCLAIMED. IN NO EVENT SHALL SEGGER Microcontroller BE LIABLE FOR *
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT *
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE *
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
* DAMAGE. *
* *
**********************************************************************
* *
* RTT version: 6.18a *
* *
**********************************************************************
---------------------------END-OF-HEADER------------------------------
File : SEGGER_RTT_Syscalls_SES.c
Purpose : Reimplementation of printf, puts and __getchar using RTT
in SEGGER Embedded Studio.
To use RTT for printf output, include this file in your
application.
Revision: $Rev: 4351 $
----------------------------------------------------------------------
*/
#include "sdk_config.h"
#if !defined(RETARGET_ENABLED) || RETARGET_ENABLED == 0
#if (defined __SES_ARM) || (defined __CROSSWORKS_ARM)
#include "SEGGER_RTT.h"
#include <stdarg.h>
#include <stdio.h>
#include "limits.h"
#include "__libc.h"
#include "__vfprintf.h"
/*********************************************************************
*
* Defines, configurable
*
**********************************************************************
*/
//
// Select string formatting implementation.
//
// RTT printf formatting
// - Configurable stack usage. (SEGGER_RTT_PRINTF_BUFFER_SIZE in SEGGER_RTT_Conf.h)
// - No maximum string length.
// - Limited conversion specifiers and flags. (See SEGGER_RTT_printf.c)
// Standard library printf formatting
// - Configurable formatting capabilities.
// - Full conversion specifier and flag support.
// - Maximum string length has to be known or (slightly) slower character-wise output.
//
// #define PRINTF_USE_SEGGER_RTT_FORMATTING 0 // Use standard library formatting
// #define PRINTF_USE_SEGGER_RTT_FORMATTING 1 // Use RTT formatting
//
#ifndef PRINTF_USE_SEGGER_RTT_FORMATTING
#define PRINTF_USE_SEGGER_RTT_FORMATTING 0
#endif
//
// If using standard library formatting,
// select maximum output string buffer size or character-wise output.
//
// #define PRINTF_BUFFER_SIZE 0 // Use character-wise output
// #define PRINTF_BUFFER_SIZE 128 // Default maximum string length
//
#ifndef PRINTF_BUFFER_SIZE
#define PRINTF_BUFFER_SIZE 128
#endif
#if PRINTF_USE_SEGGER_RTT_FORMATTING // Use SEGGER RTT formatting implementation
/*********************************************************************
*
* Function prototypes
*
**********************************************************************
*/
int SEGGER_RTT_vprintf(unsigned BufferIndex, const char * sFormat, va_list * pParamList);
/*********************************************************************
*
* Global functions, printf
*
**********************************************************************
*/
/*********************************************************************
*
* printf()
*
* Function description
* print a formatted string using RTT and SEGGER RTT formatting.
*/
int printf(const char *fmt,...) {
int n;
va_list args;
va_start (args, fmt);
n = SEGGER_RTT_vprintf(0, fmt, &args);
va_end(args);
return n;
}
#elif PRINTF_BUFFER_SIZE == 0 // Use standard library formatting with character-wise output
/*********************************************************************
*
* Static functions
*
**********************************************************************
*/
static int _putchar(int x, __printf_tag_ptr ctx) {
(void)ctx;
SEGGER_RTT_Write(0, (char *)&x, 1);
return x;
}
/*********************************************************************
*
* Global functions, printf
*
**********************************************************************
*/
/*********************************************************************
*
* printf()
*
* Function description
* print a formatted string character-wise, using RTT and standard
* library formatting.
*/
int printf(const char *fmt, ...) {
int n;
va_list args;
__printf_t iod;
va_start(args, fmt);
iod.string = 0;
iod.maxchars = INT_MAX;
iod.output_fn = _putchar;
SEGGER_RTT_LOCK();
n = __vfprintf(&iod, fmt, args);
SEGGER_RTT_UNLOCK();
va_end(args);
return n;
}
#else // Use standard library formatting with static buffer
/*********************************************************************
*
* Global functions, printf
*
**********************************************************************
*/
/*********************************************************************
*
* printf()
*
* Function description
* print a formatted string using RTT and standard library formatting.
*/
int printf(const char *fmt,...) {
int n;
char aBuffer[PRINTF_BUFFER_SIZE];
va_list args;
va_start (args, fmt);
n = vsnprintf(aBuffer, sizeof(aBuffer), fmt, args);
if (n > (int)sizeof(aBuffer)) {
SEGGER_RTT_Write(0, aBuffer, sizeof(aBuffer));
} else if (n > 0) {
SEGGER_RTT_Write(0, aBuffer, n);
}
va_end(args);
return n;
}
#endif
/*********************************************************************
*
* Global functions
*
**********************************************************************
*/
/*********************************************************************
*
* puts()
*
* Function description
* print a string using RTT.
*/
int puts(const char *s) {
return SEGGER_RTT_WriteString(0, s);
}
/*********************************************************************
*
* __putchar()
*
* Function description
* Write one character via RTT.
*/
int __putchar(int x, __printf_tag_ptr ctx) {
(void)ctx;
SEGGER_RTT_Write(0, (char *)&x, 1);
return x;
}
/*********************************************************************
*
* __getchar()
*
* Function description
* Wait for and get a character via RTT.
*/
int __getchar() {
return SEGGER_RTT_WaitKey();
}
#endif
#endif
/****** End Of File *************************************************/

复制代码

Rainier · 发表于 2021-3-9 15:01:06

在V7开发板 ThreadX的工程中 AC6编译器添加浮点RTT打印报缺少文件 #include "__libc.h"
__libc.h 这个文件该如何添加？

eric2013 · 发表于 2021-3-9 15:04:07

Rainier 发表于 2021-3-9 15:01
在V7开发板 ThreadX的工程中 AC6编译器添加浮点RTT打印报缺少文件 #include "__libc.h"
__libc.h ...

直接sprintf转换下，然后打印字符串方便些

Rainier · 发表于 2021-3-9 15:16:43

eric2013 发表于 2021-3-9 15:04
直接sprintf转换下，然后打印字符串方便些

我是想通过printf直接打印浮点到RTT，putchar用重定向printf的话只能打印单个字符。不知道像楼主位这种直接重写printf是如何实现的？

cancundiudiu · 发表于 2022-3-31 09:50:15

代码第二行，#include "__libc.h"，实际编译提示缺少文件，这个文件如何添加？

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[SEGGER RTT] SEGGER RTT默认是不支持浮点打印的，简单的点，可以自己封装下做支持