/************************************************************************
* 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
}
/******************************************************************
* SST39WriteIncrementalArray(BYTE* vData, WORD wLen);
* write an array erasing the sector if required
*****************************************************************/
void SST39WriteIncrementalArray(BYTE* vData, WORD wLen)
{
while (wLen > 0) {
// wait for any existing transaction to finish
SST39WaitProgram();
// clear the sector if on a sector boundary
if ((dwWriteAddr & SST39_FLASH_SECTOR_MASK) == 0) {
SST39SectorErase(dwWriteAddr);
SST39WaitProgram();
}
// write the byte of data
SST39WriteByte(dwWriteAddr, *vData);
// dwWriteAddr is incremented in WriteByte
vData++;
wLen--;
}
}
/************************************************************************
* 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();
}
/************************************************************************
* 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
}
