/************************************************************************
* Function: BYTE SST39WriteByte(DWORD address, BYTE data)
*
* Overview: this function writes one byte
*
* Input: address and byte to be written
*
* Output: non-zero if it's successful
*
* Notes: none
*
************************************************************************/
BYTE SST39WriteByte(DWORD address, BYTE data)
{
SST39SetAddress(0x55555555);
SST39_CS_LAT = 0;
PMDIN1 = 0xaa;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(0xaaaaaaaa);
SST39_CS_LAT = 0;
PMDIN1 = 0x55;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(0x55555555);
SST39_CS_LAT = 0;
PMDIN1 = 0xa0;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(address);
SST39_CS_LAT = 0;
PMDIN1 = data;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39WaitProgram();
if(SST39ReadByte(address) == data)
if(SST39ReadByte(address) == data)
return (1);
return (0); // failed
}
/************************************************************************
* Function: WORD SST39ReadWord(DWORD address)
*
* Overview: this function reads a 16-bit word from address specified
*
* Input: address
*
* Output: data read
*
************************************************************************/
WORD SST39ReadWord(DWORD address){
WORD_VAL temp;
temp.v[0] = SST39ReadByte(address);
temp.v[1] = SST39ReadByte(address+1);
return temp.Val;
}
/************************************************************************
* Function: BYTE SST39WriteArray(DWORD address, BYTE* pData, nCount)
*
* Overview: this function writes data array at the address specified
*
* Input: flash memory address, pointer to the data array, data number
*
* Output: return 1 if the operation was successfull
*
* Notes: none
*
************************************************************************/
BYTE SST39WriteArray(DWORD address, BYTE* pData, WORD nCount)
{
WORD counter;
BYTE* pD;
DWORD addr;
pD = pData;
addr = address;
// write
for(counter=0; counter<nCount; counter++){
while(0 == SST39WriteByte(addr,*pD));
addr++; pD++;
}
pD = pData;
addr = address;
// verify
for(counter=0; counter<nCount; counter++){
if(*pD++ != SST39ReadByte(addr++))
return 0;
}
return 1;
}
/************************************************************************
* Function: BYTE SST39WriteByte(DWORD address, BYTE data)
*
* Overview: this function writes one byte
*
* Input: address and byte to be written
*
* Output: non-zero if it's successful
*
* Notes: none
*
************************************************************************/
BYTE SST39WriteByte(DWORD address, BYTE data)
{
BYTE d1, d2;
SST39SetAddress(0x00005555);
SST39_CS_LAT = 0;
PMDIN1 = 0xAA;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(0x00002AAA);
SST39_CS_LAT = 0;
PMDIN1 = 0x55;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(0x00005555);
SST39_CS_LAT = 0;
PMDIN1 = 0xA0;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39SetAddress(address);
SST39_CS_LAT = 0;
PMDIN1 = data;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
dwWriteAddr++;
SST39WaitProgram();
d1 = SST39ReadByte(address);
d2 = SST39ReadByte(address);
if ((d1 == data) && (d2 == data))
return 1;
return 0; // failed
}
