16F 18F指针差异

嗨，我把我的代码从一个16F1887移植到一个18F46K40，与指针或内存分配似乎有一些不同。该代码是用于编写一个LCD，并这样做-主（）{LCDyWrrad（“A”）；}空隙LCDAX写（const char * DATAAL字符串）{（**数据字符串）{//…将数据发送到相关端口；*DATAStiON +++；}在16F上工作良好，并且工作在18F4680上，但对于18F46K40，“while”循环永远不会进入，好像*DATAYSHIPE字符串为NULL。当我运行调试时，DATAXX字符串看起来应该是0x41。（0B0100000 01）如果我将while循环条件强制为true，稍后在LCDScript（）函数中有此代码“*DATAXStand & 0B1111000”。调试显示该操作的结果为0b00亿。再一次看来，*DATAY字符串被解释为“0”。有什么想法吗？考虑到



      以下为原文

    Hi,
I have ported my code from a 16F18877 to a 18F46K40 and there seems to be some differences with pointers or memory allocation. The code is for writing to an LCD and goes like this -

main()
{
   lcd_write("A");
}

void lcd_write(const char *data_string)
{
    while(*data_string)
    { // ... send data to relevant port;  *datastring++;}
}

Works fine on the 16F, and also works on a 18F4680, but for the 18F46K40, the 'while' loop is never entered, as if *data_string is NULL. When I run debug the data_string looks like it should though , 0x41. (0b01000001)

If I force the while loop condition to TRUE, later in the lcd_write() function there is this code '*data_string & 0b1111000'. Debug shows the result of that operation to be 0b00000000. And so again it seems that *data_string is being interpreted as '0'.

Any ideas?

regards
Tim