Microchip Taiwan - Re: [求助] PIC18F6722 EEPROM問題~~ [8-bit PIC® MCU]

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PIC_NEWER

Re: [求助] PIC18F6722 EEPROM問題~~

高級會員

謝謝回覆!!
寫入有BIT (WRERR or EEIF)可以判斷, 讀取找不到BIT.

另外, 寫入也有問題, 有時會當在迴圈跳不出來, 程式如下:

void EE_Write (unsigned char EE_Write_Address_Hi,unsigned char EE_Write_Address , unsigned char EE_Write_Data_Byte)
{
PIR2bits.EEIF=0;
EEADRH=0;
EEADRH = (Address & 0xFF00)>>8;
EEADR = Address & 0x00FF;
EEDATA=bData;
EECON1bits.EEPGD=0; // Acess Data EEPROM Memory
EECON1bits.CFGS=0; // Acess Fash Program or Data EEPROM Memory
EECON1bits.WREN=1;
INTCONbits.GIE=0; // Hi Priority
// Lowi Priority
_asm
movlw 0x55
movwf EECON2,0
movlw 0xAA
movwf EECON2,0
bsf EECON1,1,0
nop
_endasm

INTCONbits.GIE=1; // Hi Priority
while(!PIR2bits.EEIF);
PIR2bits.EEIF=0;
EECON1bits.WREN=0;
}

發表於: 2007/9/10 9:05

yiming

Re: [求助] PIC18F6722 EEPROM問題~~

資深會員

你好像沒有等EEPROM讀取完成,就把EEDATA的值傳回來了,應該要先判斷EEPROM是否讀取完成,有一個BIT可以判斷.


unsigned char EE_Read (unsigned char EE_Read_Address_Hi,unsigned char EE_Read_Address)

{

    EEADRH=0;

    EEADRH=EE_Read_Address_Hi;

    EEADR=EE_Read_Address;

    EECON1bits.EEPGD=0;

    EECON1bits.CFGS=0;

    EECON1bits.RD=1;

    return EEDATA;

}

發表於: 2007/9/8 2:03

PIC_NEWER

[求助] PIC18F6722 EEPROM問題~~

高級會員

讀取EEPROM會發生錯誤, 程式會停在count2 = count2 + 1, count1不一定(Random), 程式測試如下:


#define            RS232TxMax    105



void main(void)

{

    ...

    while(1)

    {

        ...

        Test_RS232();



    }

}



void Test_RS232(void)

{

    unsigned char i;

    unsigned short Address;



    count1 = count1+1;

    for (i=0;i<RS232TxMax;i++)    

    {

        test_buf[i] = 0;

                RS232TxBuf[i]=0

    }

                

    Address = RX_CH1_ADDR;// + i * 0x10;    // RX_CH1_ADDR = 0x10

    for (i=0;i<16;i++)

    {

        EE_Addr=(Address+i) & 0x00FF;

        EE_Addr_Hi=((Address+i) & 0xFF00)>>8;    

        EE_Read(EE_Addr_Hi,EE_Addr);

        test_buf[i]=EEDATA;    

    }

    for (i=0;i<16;i++)

    {

        EE_Addr=(Address+i) & 0x00FF;

        EE_Addr_Hi=((Address+i) & 0xFF00)>>8;    

        EE_Read(EE_Addr_Hi,EE_Addr);

        RS232TxBuf[i]=EEDATA;    

    }

                

    for (i=0;i<16;i++)

    {

        if (test_buf[i] != RS232TxBuf[i])

            count2 = count2 + 1;    <----------

    }

    if ((count1 == 1000) || (count2==5))

        count3=1;

}



unsigned char EE_Read (unsigned char EE_Read_Address_Hi,unsigned char EE_Read_Address)

{

    EEADRH=0;

    EEADRH=EE_Read_Address_Hi;

    EEADR=EE_Read_Address;

    EECON1bits.EEPGD=0;

    EECON1bits.CFGS=0;

    EECON1bits.RD=1;

    return EEDATA;

}