通过这样的定义，使得sTest2结构体整体大小只占用3个字节在，这种方式在MDK中比较常用。当然有经验的朋友...
//该方式只是使用ac5编译器,结构体不对齐的方式1,结构体的长度,就是各个变量长度的和 __packedtypedefstruct_li_st { uint8_t a;//1个 uint16_t b;//2个 uint32_t c;//4个 uint64_t d;//8个 }li_st; //ac5编译器的结构体不对齐的方式2,结构体的长度,就是各个变量长度的和 typedefstruct_...
AI检测代码解析 #elif(CC_ARM_AC6)//ac6 ac5通用,的结构体不对齐方式,结构体的长度,就是各个变量长度的和typedefstruct_li_st_ac6{uint8_ta;//1个uint16_tb;//2个uint32_tc;//4个uint64_td;//8个}__attribute__((packed))li_st_ac6;//ac6 ac5通用,的结构体不对齐方式2,结构体的长度,就...
如果硬件支持NOP指令,则该句被替换为NOP指令,如果硬件不支持NOP指令,编译器将它替换为一个等效于NOP的指令,具体指令由编译器自己决定。 16. 还有一些编译器知识,我放在了另外一篇博文里,《有趣的keil mdk细节》。 后记:关于Keil MDK的应该掌握的知识,在《编写优质嵌入式C程序》一文的第三章中,做了进一步总结,可...
但keil MDK自动使用对象包含enum范围的最小整型来实现(比如char类型),除非使用编译器命令‑‑enum_is_int 来强制将enum的基础类型设为至少和整型一样宽。超出范围的枚举值默认仅产生警告:#66: enumeration value is out of "int" range 13. 结构体:struct {...
MDK Microcontroller Development Kit Keil MDKis the complete software development environment for a range of Arm Cortex-M based microcontroller devices. MDK includesKeil Studio, theµVision IDE, anddebugger,Arm C/C++ compiler, and essentialmiddlewarecomponents. It supports all silicon vendors withmore ...
: expected a type specifier error: expected a ";" 这个错误。是CCS3.3编译器本身不支持__packed这种结构体成员的对齐方式 wumiaohui2018-06-21 10:16:55 漫谈C语言结构体 ,无论你是在VC6.0还是KeilC51,还是KeilMDK中,当你需要定义一个结构体时,只要你稍微留心结构体成员变量内存对齐这一现象,就可以在很大...
{ DWORD n; USB_CTRL = ((EPNum & 0x0F) << 2) | CTRL_WR_EN; TX_PLENGTH = cnt; for (n = 0; n < (cnt + 3) / 4; n++) { TX_DATA = *((__packed DWORD *)pData); pData += 4; } USB_CTRL = 0; WrCmd(CMD_SEL_EP(EPAdr(EPNum))); WrCmd(CMD_VALID_BUF); ...
If I remove __packed from the struct's typedef and rebuild the code, the map file shows that the var then does get aligned on a 32-bit boundary; and the data abort error goes away too. I'm still confused. I don't see how this code can work if these structures don'...
Keil MDK Options Share More actions Cancel Related How was your experience today? This discussion has been locked. You can no longer post new replies to this discussion. If you have a question you can start a new discussion Dealing with non-aligned dataCactus...