RT-Thread-[RealTouch例程]内核裁剪RT-Thread问答社区

[RealTouch例程]内核裁剪

发布于 2012-09-25 13:30:30 浏览：10350 订阅该版

实验目的
因为RT-Thread拥有高度可裁剪性，我们尝试一下可以它到底可以裁到多小
硬件说明
本实验使用RT-Thread官方的Realtouch开发板作为实验平台。涉及到的硬件主要为
无，本实验只涉及编译，当然在板上验证正确性也是可以的
 实验原理及程序结构
关于内核裁剪的内容，也可以参考wiki：http://www.rt-thread.org/dokuwiki/doku.php?id=rt-thread%E8%A3%81%E5%89%AA%E7%A4%BA%E4%BE%8B
实验设计
本实验的主要设计目的是通过修改rt_config.h文件，来尝试可以达到的最小裁剪尺寸。请读者注意，本实验本身不具有实际的工程参考价值，只是帮助读者快速了解相关API的用法。

源程序说明
本实验对应xxxxxx
系统依赖
因为是为了裁剪，所以在rtconfig.h中不需要特意开启任何项目
主程序说明以及相关编译结果
首先我们看看默认的rtconfig.h中内容。
```/* RT-Thread config file */
#ifndef __RTTHREAD_CFG_H__
#define __RTTHREAD_CFG_H__

//#define RT_USING_NEWLIB

/* RT_NAME_MAX*/
#define RT_NAME_MAX	   8

/* RT_ALIGN_SIZE*/
#define RT_ALIGN_SIZE	8

/* PRIORITY_MAX */
#define RT_THREAD_PRIORITY_MAX	32

/* Tick per Second */
#define RT_TICK_PER_SECOND	    100

/* SECTION: RT_DEBUG */
/* Thread Debug */
#define RT_DEBUG

#define RT_USING_OVERFLOW_CHECK

/* Using Hook */
#define RT_USING_HOOK

#define IDLE_THREAD_STACK_SIZE     1024

/* Using Software Timer */
/* #define RT_USING_TIMER_SOFT */
#define RT_TIMER_THREAD_PRIO		4
#define RT_TIMER_THREAD_STACK_SIZE	512
#define RT_TIMER_TICK_PER_SECOND	10

/* SECTION: IPC */
/* Using Semaphore*/
#define RT_USING_SEMAPHORE

/* Using Mutex */
#define RT_USING_MUTEX

/* Using Event */
#define RT_USING_EVENT

/* Using MailBox */
#define RT_USING_MAILBOX

/* Using Message Queue */
#define RT_USING_MESSAGEQUEUE

/* SECTION: Memory Management */
/* Using Memory Pool Management*/
#define RT_USING_MEMPOOL

/* Using Dynamic Heap Management */
#define RT_USING_HEAP

/* Using Small MM */
#define RT_USING_SMALL_MEM

/* SECTION: Device System */
/* Using Device System */
#define RT_USING_DEVICE
#define RT_USING_SERIAL

/* SECTION: Console options */
#define RT_USING_CONSOLE
/* the buffer size of console*/
#define RT_CONSOLEBUF_SIZE	128
/* console name */
#define RT_CONSOLE_DEVICE_NAME	"uart3"

#define RT_USING_COMPONENTS_INIT

/* SECTION: finsh, a C-Express shell */
#define RT_USING_FINSH
/* Using symbol table */
#define FINSH_USING_SYMTAB
#define FINSH_USING_DESCRIPTION

/* SECTION: device filesystem */
/* #define RT_USING_DFS */
//#define RT_USING_DFS_ELMFAT
#define RT_DFS_ELM_WORD_ACCESS
/* Reentrancy (thread safe) of the FatFs module.  */
#define RT_DFS_ELM_REENTRANT
/* Number of volumes (logical drives) to be used. */
#define RT_DFS_ELM_DRIVES			2
/* #define RT_DFS_ELM_USE_LFN			1 */
#define RT_DFS_ELM_MAX_LFN			255
/* Maximum sector size to be handled. */
#define RT_DFS_ELM_MAX_SECTOR_SIZE  512

/* the max number of mounted filesystem */
#define DFS_FILESYSTEMS_MAX			2
/* the max number of opened files 		*/
#define DFS_FD_MAX					4

/* SECTION: lwip, a lighwight TCP/IP protocol stack */
//#define RT_USING_LWIP
/* LwIP uses RT-Thread Memory Management */
#define RT_LWIP_USING_RT_MEM
/* Enable ICMP protocol*/
#define RT_LWIP_ICMP
/* Enable UDP protocol*/
#define RT_LWIP_UDP
/* Enable TCP protocol*/
#define RT_LWIP_TCP
/* Enable DNS */
#define RT_LWIP_DNS

/* the number of simulatenously active TCP connections*/
#define RT_LWIP_TCP_PCB_NUM	5

/* ip address of target*/
#define RT_LWIP_IPADDR0	192
#define RT_LWIP_IPADDR1	168
#define RT_LWIP_IPADDR2	1
#define RT_LWIP_IPADDR3	30

/* gateway address of target*/
#define RT_LWIP_GWADDR0	192
#define RT_LWIP_GWADDR1	168
#define RT_LWIP_GWADDR2	1
#define RT_LWIP_GWADDR3	1

/* mask address of target*/
#define RT_LWIP_MSKADDR0	255
#define RT_LWIP_MSKADDR1	255
#define RT_LWIP_MSKADDR2	255
#define RT_LWIP_MSKADDR3	0

/* tcp thread options */
#define RT_LWIP_TCPTHREAD_PRIORITY		12
#define RT_LWIP_TCPTHREAD_MBOX_SIZE		4
#define RT_LWIP_TCPTHREAD_STACKSIZE		1024

/* ethernet if thread options */
#define RT_LWIP_ETHTHREAD_PRIORITY		15
#define RT_LWIP_ETHTHREAD_MBOX_SIZE		4
#define RT_LWIP_ETHTHREAD_STACKSIZE		512

/* TCP sender buffer space */
#define RT_LWIP_TCP_SND_BUF	8192
/* TCP receive window. */
#define RT_LWIP_TCP_WND		8192

#define CHECKSUM_CHECK_TCP              0
#define CHECKSUM_CHECK_IP               0
#define CHECKSUM_CHECK_UDP              0

#define CHECKSUM_GEN_TCP                0
#define CHECKSUM_GEN_IP                 0
#define CHECKSUM_GEN_UDP                0

#endif```
这是keil编译的结果：
```Program Size: Code=52928 RO-data=4524 RW-data=432 ZI-dara=6552```
这是gcc编译结果：
```text        data        bss       dec        hex        filename
58148        240        5360      63748       f904       rtthread-stm32f4xx.axf```
这时候的结果包含有一个初始化线程，接下来我们将application.c中这个初始化线程移除，另外的话我们要对rt_config.h做一次比较大的手术。参照wiki上项目，我们几乎见到RT_USING_字样的宏就将其注释掉，不多说，上“马”：
```/* RT-Thread config file */
#ifndef __RTTHREAD_CFG_H__
#define __RTTHREAD_CFG_H__

//#define RT_USING_NEWLIB

/* RT_NAME_MAX*/
#define RT_NAME_MAX	   4

/* RT_ALIGN_SIZE*/
#define RT_ALIGN_SIZE	4

/* PRIORITY_MAX */
#define RT_THREAD_PRIORITY_MAX	8

/* Tick per Second */
#define RT_TICK_PER_SECOND	    100

/* SECTION: RT_DEBUG */
/* Thread Debug */
//#define RT_DEBUG

//#define RT_USING_OVERFLOW_CHECK

/* Using Hook */
//#define RT_USING_HOOK

#define IDLE_THREAD_STACK_SIZE     256

/* Using Software Timer */
/* #define RT_USING_TIMER_SOFT */
#define RT_TIMER_THREAD_PRIO		4
#define RT_TIMER_THREAD_STACK_SIZE	512
#define RT_TIMER_TICK_PER_SECOND	10

/* SECTION: IPC */
/* Using Semaphore*/
#define RT_USING_SEMAPHORE

/* Using Mutex */
#define RT_USING_MUTEX

/* Using Event */
#define RT_USING_EVENT

/* Using MailBox */
//#define RT_USING_MAILBOX

/* Using Message Queue */
//#define RT_USING_MESSAGEQUEUE

/* SECTION: Memory Management */
/* Using Memory Pool Management*/
//#define RT_USING_MEMPOOL

/* Using Dynamic Heap Management */
//#define RT_USING_HEAP

/* Using Small MM */
//#define RT_USING_SMALL_MEM

/* SECTION: Device System */
/* Using Device System */
//#define RT_USING_DEVICE
//#define RT_USING_SERIAL

/* SECTION: Console options */
//#define RT_USING_CONSOLE
/* the buffer size of console*/
#define RT_CONSOLEBUF_SIZE	128
/* console name */
#define RT_CONSOLE_DEVICE_NAME	"uart3"

//#define RT_USING_COMPONENTS_INIT

/* SECTION: finsh, a C-Express shell */
//#define RT_USING_FINSH
/* Using symbol table */
#define FINSH_USING_SYMTAB
#define FINSH_USING_DESCRIPTION