/************************************************************************
* 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: BYTE SST39ReadByte(DWORD address)
*
* Overview: this function reads a byte from address specified
*
* Input: address
*
* Output: data read
*
************************************************************************/
BYTE SST39ReadByte(DWORD address)
{
BYTE temp;
SST39SetAddress(address);
// enable
SST39_CS_LAT = 0;
temp = PMDIN1;
// wait for reading cycle is completed
SST39PMPWaitBusy();
// disable
SST39_CS_LAT = 1;
// read result
temp = PMDIN1;
// wait for dummy reading cycle is completed
SST39PMPWaitBusy();
return (temp);
}
/************************************************************************
* 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
}
/************************************************************************
* Function: void SST39ReadArray(DWORD address, BYTE* pData, nCount)
*
* Overview: this function reads data array from the address specified
*
* Input: flash memory address, pointer to the buffer receiving data, data number
*
* Output: none
*
************************************************************************/
void SST39ReadArray(DWORD address, BYTE *pData, WORD nCount)
{
WORD counter;
BYTE temp;
SST39SetAddress(address);
// enable
SST39_CS_LAT = 0;
// run dummy cycle to get data
temp = PMDIN1;
for(counter = 0; counter < nCount; counter++)
{
SST39PMPWaitBusy();
if(PMADDR == 0)
{
// set upper address bits
address += 0x010000;
if(((DWORD_VAL) address).v[2] & 0x01)
SST39_A16_LAT = 1;
else
SST39_A16_LAT = 0;
if(((DWORD_VAL) address).v[2] & 0x02)
SST39_A17_LAT = 1;
else
SST39_A17_LAT = 0;
if(((DWORD_VAL) address).v[2] & 0x04)
SST39_A18_LAT = 1;
else
SST39_A18_LAT = 0;
}
*pData++ = PMDIN1;
}
SST39PMPWaitBusy();
// disable
SST39_CS_LAT = 1;
}
/************************************************************************
* Function: void SST39SectorErase(DWORD address)
*
* Overview: erase whole chip
*
* Input: none
*
* Output: none
*
************************************************************************/
void SST39SectorErase(DWORD address)
{
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=0x80;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
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;
// set the sector address
SST39SetAddress(address);
SST39_CS_LAT = 0;
PMDIN1=0x30;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39WaitProgram();
}
/************************************************************************
* Function: void SST39ChipErase(void)
*
* Overview: erase whole chip
*
* Input: none
*
* Output: none
*
************************************************************************/
void SST39ChipErase(void)
{
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=0x80;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
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=0x10;
SST39PMPWaitBusy();
SST39_CS_LAT = 1;
SST39WaitProgram();
}
