[英]Referencing an external msp430 assembly .string in a c extern
Programming the msp430, I have a string declared using the .string
directive: 对msp430进行编程时,我使用
.string
指令声明了一个字符串:
message: .string "Hello World"
I want to reference that outside the module, so I .def
'd it: 我想引用模块外,所以我
.def
倒是它:
.def message
message: .string "Hello World"
In C, I want to reference the string, but get the wrong character: 在C语言中,我想引用字符串,但是得到错误的字符:
extern char* message;
int main(void) {
char c = *message; // First character of message is listed as 'z'
}
Any ideas about what might cause this? 关于什么可能导致此的任何想法? It compiles fine, and there are several functions in the assembly that I reference without a problem.
它可以很好地编译,并且我引用的程序集中有几个函数没有问题。
Use extern char message[];
使用
extern char message[];
. 。 When you declare it as a pointer you're saying
message
is a value that only takes 2 bytes of memory and stores an address. 当您将其声明为指针时,是说
message
是一个仅占用2个字节内存并存储一个地址的值。 When declare it as array of char
you're saying that's a sequence of 1 byte characters, which is what a string is. 当将其声明为
char
数组时,您要说的是一个1字节字符的序列,这就是字符串。
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