AVR E2PROM可靠性测试
准备系统的测试下AVR的E2PROM的可靠性，现采用M16最小系统+串口，先测试上电后只读不写的情况，在读的过程中人工不断的开关电源N次，n次后由串口观察之前的初始化数据是否改变，测试代码如下：#include <mega16.h>
unsigned char eeprom Tab[]=
{
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1,2,3,4,5,6,7,8,9,
0,1
};
#define RXB8 1
#define TXB8 0
#define UPE 2
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
// USART Receiver buffer
#define RX_BUFFER_SIZE 32
char rx_buffer;
#if RX_BUFFER_SIZE<256
unsigned char rx_wr_index,rx_rd_index,rx_counter;
#else
unsigned int rx_wr_index,rx_rd_index,rx_counter;
#endif
// This flag is set on USART Receiver buffer overflow
bit rx_buffer_overflow;
// USART Receiver interrupt service routine
interrupt void usart_rx_isr(void)
{
char status,data;
status=UCSRA;
data=UDR;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
{
rx_buffer=data;
if (++rx_wr_index == RX_BUFFER_SIZE) rx_wr_index=0;
if (++rx_counter == RX_BUFFER_SIZE)
{
rx_counter=0;
rx_buffer_overflow=1;
};
};
}
#ifndef _DEBUG_TERMINAL_IO_
// Get a character from the USART Receiver buffer
#define _ALTERNATE_GETCHAR_
#pragma used+
char getchar(void)
{
char data;
while (rx_counter==0);
data=rx_buffer;
if (++rx_rd_index == RX_BUFFER_SIZE) rx_rd_index=0;
#asm("cli")
--rx_counter;
#asm("sei")
return data;
}
#pragma used-
#endif
// USART Transmitter buffer
#define TX_BUFFER_SIZE 32
char tx_buffer;
#if TX_BUFFER_SIZE<256
unsigned char tx_wr_index,tx_rd_index,tx_counter;
#else
unsigned int tx_wr_index,tx_rd_index,tx_counter;
#endif
// USART Transmitter interrupt service routine
interrupt void usart_tx_isr(void)
{
if (tx_counter)
{
--tx_counter;
UDR=tx_buffer;
if (++tx_rd_index == TX_BUFFER_SIZE) tx_rd_index=0;
};
}
#ifndef _DEBUG_TERMINAL_IO_
// Write a character to the USART Transmitter buffer
#define _ALTERNATE_PUTCHAR_
#pragma used+
void putchar(char c)
{
while (tx_counter == TX_BUFFER_SIZE);
#asm("cli")
if (tx_counter || ((UCSRA & DATA_REGISTER_EMPTY)==0))
{
tx_buffer=c;
if (++tx_wr_index == TX_BUFFER_SIZE) tx_wr_index=0;
++tx_counter;
}
else
UDR=c;
#asm("sei")
}
#pragma used-
#endif
// Standard Input/Output functions
#include <stdio.h>
// Declare your global variables here
void main(void)
{
// Declare your local variables here
unsigned char ls=0;
unsigned int i;
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x00;
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0xD8;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x33;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// Global enable interrupts
#asm("sei")
while (1)
{
for(i=0;i<512;i++)
{
ls=Tab;
putchar(ls);
}
while(1);
};
}
经过多次的测试，不论是BOD开启与否，发现数据无一改变，但我之前设备上的应用发现即便是只读不写数据都是会改变的，哪位能提出篡改E2PROM概率比较大的方法以便我测试？我会陆续的把测试结论更新 找个电子打火机点火的那个东西，向着供电正、负极多打几次就能看出来。CPU不会坏，如果有数据丢失，提高电源保护等级。如果没什么太贵的芯片，给接口部分也来几次。
注意，AVR一般不会损坏，但是其他芯片不好说。进行这种极端测试，后果自负。
页:
[1]