// Read User Zone
uchar cm_ReadLargeZone(uint uiCryptoAddr, puchar pucBuffer, uchar ucCount)
{
uchar ucReturn;
ucCM_InsBuff[0] = 0xb2;
ucCM_InsBuff[1] = (uchar)(uiCryptoAddr>>8);
ucCM_InsBuff[2] = (uchar)uiCryptoAddr;
ucCM_InsBuff[3] = ucCount;
// Three bytes of the command must be included in the polynominals
cm_GPAcmd3(ucCM_InsBuff);
// Read the data
if ((ucReturn = cm_ReadCommand(ucCM_InsBuff, pucBuffer, ucCount)) != SUCCESS) return ucReturn;
// Include the data in the polynominals and decrypt if required
cm_GPAdecrypt(ucCM_Encrypt, pucBuffer, ucCount);
return SUCCESS;
}
// Read Checksum
uchar cm_ReadChecksum(uchar ucChipAddr, puchar pucChkSum)
{
uchar ucDCR[1];
uchar ucReturn;
ucCmdRdChk[0] = (0x6 | ((ucChipAddr & 0xf) << 4));
// 20 0x00s (10 0x00s, ignore first byte, 5 0x00s, ignore second byte, 5 0x00s
cm_GPAGenN(20);
// Read the checksum
if ((ucReturn = cm_ReadCommand(ucCmdRdChk, pucChkSum, 2)) != SUCCESS)
return ucReturn;
// Check if unlimited reads allowed
if ((ucReturn = cm_ReadConfigZone(ucChipAddr, DCR_ADDR, ucDCR, 1)) != SUCCESS)
return ucReturn;
if ((ucDCR[0] & DCR_UCR))
cm_ResetCrypto();
return SUCCESS;
}
