编辑:当我检查"按顺序保存变量时,问题似乎消失了#34; C51优化菜单中的框。我还是不知道是什么原因导致了这个问题。如果是永久性修复有没有人知道发生了什么?
我正在尝试在C51中构建一个图形菜单。我正在使用menu_init()
功能将文本带到4行LCD屏幕上。该函数定义为:
void menu_init(unsigned char** menu_array, unsigned char menu_length)
{
unsigned char i, menu_max_index;
write_command(CLEAR_DISPLAY);
if (menu_length < 4) {menu_max_index = menu_length;}
else {menu_max_index = 4;}
for (i = 0; i < menu_max_index; i++)
{
write_string_to_line(i+1, (menu_array[i]));
}
}
void write_string_to_line (unsigned char line, unsigned char* lcd_string)
{
unsigned char i = 0;
gotoxy(0, line);
while(lcd_string[i] != '\0')
{
EN = 0;
RS = 1;
EN = 1;
P0 = lcd_string[i];
i++;
EN = 0;
delay(DELAY_COUNT);
}
}
在错误发生时,menu_array
是:
unsigned char* xdata enter_byte_count_items[3] = {enter_byte_count_text, enter_byte_count_text2, enter_byte_count_number};
//For the unfamiliar, xdata is the segment in the 8051 memory, which the variable is located in
数组的初始值设定项如下:
unsigned char xdata enter_byte_count_text[20] = " Enter byte count of";
unsigned char xdata enter_byte_count_text2[20] = " PGN: ";
unsigned char xdata enter_byte_count_number[20] = " Bytes";
这些就在代码附近,这是另一个菜单的字符串:
unsigned char xdata enter_pgn_text[20] = " Enter PGN Number";
unsigned char xdata enter_pgn_number[20] = " 64000" ;
我希望这段代码能够按顺序打印字符串。但是,情况并非如此,输出如下:
Enter byte count of
x:
Bytes PGN Number
我无法理解发生了什么......我相信这是关于指针衰减的东西,但我无法确定问题所在。我哪里做错了?