马老师，我这段代码编译能通过，但走到init_device()内部就死住了，为什么呢？
我是用仿真器单步走的，会死在port_init()内部，注释掉port_init(),又会死在init_device()里面，编这个小程序是为了测试外挂的32KRAM，起先定义为0X1100到0X90FF。虽然程序本身也会用到变量，但缺省
应该是放在内部RAM的吧？不会和被测试的外部RAM冲突吧？有可能是堆栈的问题吗？
#include <iom128v.h>
#include <macros.h>
void port_init(void)
{
PORTA = 0x00;
DDRA= 0x00;
PORTB = 0x00;
DDRB= 0x00;
PORTC = 0x00; //m103 output only
DDRC= 0x00;
PORTD = 0x00;
DDRD= 0x00;
PORTE = 0x00;
DDRE= 0x00;
PORTF = 0x00;
DDRF= 0x00;
PORTG = 0x00;
DDRG= 0x00;
}
//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV= 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
MCUCR = 0xC0;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x00; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
main()
{
unsigned char OriChar = 0;
unsigned char ReadChar = 0;
unsigned char* pChar = (unsigned char *)0x1100;
unsigned char* pChar2 = (unsigned char *)0x7fff;
init_devices();
//AUXR = 0x00;
//P10 = 0x00;
PORTD = PORTD & 0xef;
while(1)
{
OriChar = OriChar + 7;
pChar = pChar + 1;
if (pChar > (unsigned char *)0x7fFF) pChar = (unsigned char *)0x1100;
*pChar = OriChar;
ReadChar = *pChar;
if( OriChar == ReadChar)
{
PORTE = PORTE | 0x10;
}
else
{
PORTE = PORTE & 0xef;
}
}
} 先检查你M128溶丝位配置工作方式为128方式吗?
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