?? i2c.c
字號(hào):
)
{
DWORD Length;
PBYTE pWrite = (PBYTE)pBuf;
RegMCR mcr;
RegMIER mier;
RegMSR msr;
PI2C_DRIVER_INFO pI2c = pOpen -> pI2CHandle;
if ( dwLen < 2 ) return 0;
if ( InitializeI2C(pOpen, TRUE) == FALSE )
goto write_failure;
if ( SetCCR(pOpen) == FALSE )
goto write_failure;
try {
mcr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MCR);
mcr.bits.ESG = 0;
mcr.bits.MIE = 1;
mcr.bits.TSBE = 0;
mcr.bits.FSB = 0;
if ( pOpen -> bSingleStage == TRUE ){
mcr.bits.MDBS = 1;
}else{
mcr.bits.MDBS = 0;
}
WRITE_REGISTER_ULONG(pI2c -> MCR, mcr.AsDWORD);
mcr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MCR);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
if ( mcr.bits.FSDA ){
// Other I2C device is using the I2C bus.
SetLastError( I2C_BUS_BUSY );
goto write_failure;
}
try {
WRITE_REGISTER_ULONG(pI2c -> MAR, *(pWrite++) & 0xfe);
dwLen --;
WRITE_REGISTER_ULONG(pI2c -> TXD, *pWrite);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
ResetEvent( pI2c -> hIntEvent );
mier.AsDWORD = 0;
mier.bits.MATE = 1;
mier.bits.MDEE = 1;
mier.bits.MALE = 1;
mier.bits.MNRE = 1;
mier.bits.MSTE = 1;
try {
WRITE_REGISTER_ULONG(pI2c -> MIER, mier.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
pI2c -> data -> dwType = I2C_MASTER_TX;
pI2c -> data -> dwCount = dwLen;
pI2c -> data -> dwPoint = 1;
for( Length = 0;Length < dwLen;Length ++ ){
pI2c -> data -> bBuffer[Length] = *(pWrite++);
}
mcr.bits.ESG = 1;
try {
WRITE_REGISTER_ULONG(pI2c -> MCR, mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
if ( WaitForSingleObject(pI2c -> hIntEvent, I2C_WRITE_TIMEOUT) == WAIT_TIMEOUT ){
SetLastError( I2C_TIMEOUT );
goto write_failure;
}
// for 100Kbps
Sleep(1);
try {
msr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MSR);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
if ( msr.bits.MAL ){
SetLastError( I2C_MASTER_ARBITRATION_LOST );
goto write_failure;
}
if ( msr.bits.MNR ){
SetLastError( I2C_MASTER_NACK_RECEIVED );
goto write_failure;
}
try {
msr.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> MSR, msr.AsDWORD);
mcr.bits.MIE = 0;
WRITE_REGISTER_ULONG(pI2c -> MCR, mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
return pI2c -> data -> dwPoint;
write_failure:
DEBUGMSG(ZONE_ERROR, (TEXT("Write failure\r\n")));
try {
msr.AsDWORD = 0;
mcr.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> MSR, msr.AsDWORD);
WRITE_REGISTER_ULONG(pI2c -> MIER, 0);
WRITE_REGISTER_ULONG(pI2c -> MCR, READ_REGISTER_ULONG(pI2c -> MCR) & mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
}
return 0;
}
DWORD
I2C_MasterRead(
PI2C_OPEN_INFO pOpen,
LPCVOID pBuf,
DWORD dwLen
)
{
DWORD Length;
PBYTE pRead = (PBYTE)pBuf;
RegMCR mcr;
RegMIER mier;
RegMSR msr;
PI2C_DRIVER_INFO pI2c = pOpen -> pI2CHandle;
InitializeI2C(pOpen, TRUE);
try {
mcr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MCR);
mcr.bits.ESG = 0;
mcr.bits.MIE = 1;
mcr.bits.FSB = 0;
if ( pOpen -> bSingleStage == TRUE ){
mcr.bits.MDBS = 1;
}else{
mcr.bits.MDBS = 0;
}
WRITE_REGISTER_ULONG(pI2c -> MCR, mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
if ( SetCCR(pOpen) == FALSE ){
return 0;
}
try {
mcr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MCR);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
if ( mcr.bits.FSDA ){
// Other I2C device is using the I2C bus.
mcr.AsDWORD = 0;
mcr.bits.FSB = 1;
WRITE_REGISTER_ULONG(pI2c -> MCR, READ_REGISTER_ULONG(pI2c -> MCR) & mcr.AsDWORD);
SetLastError( I2C_BUS_BUSY );
return 0;
}
try {
mier.AsDWORD = 0;
mier.bits.MATE = 1;
mier.bits.MDRE = 1;
mier.bits.MSTE = 1;
mier.bits.MALE = 1;
mier.bits.MNRE = 1;
WRITE_REGISTER_ULONG(pI2c -> MIER, mier.AsDWORD);
WRITE_REGISTER_ULONG(pI2c -> MAR, *pRead | 0x01);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
pI2c -> data -> dwType = I2C_MASTER_RX;
pI2c -> data -> dwPoint = 0;
pI2c -> data -> dwCount = dwLen;
ResetEvent( pI2c -> hIntEvent );
mcr.bits.ESG = 1;
if ( dwLen == 1 ){
mcr.bits.FSB = 1;
}
try {
WRITE_REGISTER_ULONG(pI2c -> MCR, mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
if ( WaitForSingleObject(pI2c -> hIntEvent, I2C_READ_TIMEOUT) != WAIT_TIMEOUT ){
for( Length = 0;Length < pI2c -> data -> dwPoint;Length ++ ){
*(pRead++) = pI2c -> data -> bBuffer[Length];
}
}
else{
Length = 0;
SetLastError( I2C_TIMEOUT );
}
try {
msr.AsDWORD = READ_REGISTER_ULONG(pI2c -> MSR);
if ( msr.bits.MAL ){
SetLastError( I2C_MASTER_ARBITRATION_LOST );
msr.bits.MAL = 0;
WRITE_REGISTER_ULONG(pI2c -> MSR, msr.AsDWORD);
Length = 0;
}
// WRITE_REGISTER_ULONG(pI2c -> MIER, 0);
msr.AsDWORD = 0;
mcr.AsDWORD = 0;
mcr.bits.FSB = 1;
WRITE_REGISTER_ULONG(pI2c -> MSR, msr.AsDWORD);
WRITE_REGISTER_ULONG(pI2c -> MCR, READ_REGISTER_ULONG(pI2c -> MCR) & mcr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
return Length;
}
DWORD
I2C_SlaveWrite(
PI2C_OPEN_INFO pOpen,
LPVOID pBuf,
DWORD dwLen
)
{
PBYTE pWrite = (PBYTE)pBuf;
RegSCR scr;
RegSIER sier;
DWORD Length;
PI2C_DRIVER_INFO pI2c = pOpen -> pI2CHandle;
if ( InitializeI2C(pOpen, FALSE) == FALSE )
goto write_failure;
try {
scr.AsDWORD = 0;
scr.bits.SIE = 1;
if ( pOpen -> bSingleStage == TRUE ){
scr.bits.SDBS = 1;
}else{
scr.bits.SDBS = 0;
}
WRITE_REGISTER_ULONG(pI2c -> SAR, *(pWrite++));
dwLen --;
WRITE_REGISTER_ULONG(pI2c -> SCR, scr.AsDWORD);
WRITE_REGISTER_ULONG(pI2c -> TXD, *pWrite);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
pI2c -> data -> dwType = I2C_SLAVE_TX;
pI2c -> data -> dwCount = dwLen;
pI2c -> data -> dwPoint = 1;
for( Length = 0;Length < dwLen;Length ++ ){
pI2c -> data -> bBuffer[Length] = *(pWrite++);
}
try {
sier.AsDWORD = 0;
sier.bits.SARE = 1;
sier.bits.SDEE = 1;
sier.bits.SSRE = 1;
WRITE_REGISTER_ULONG(pI2c -> SIER, sier.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
ResetEvent( pI2c -> hIntEvent );
if ( WaitForSingleObject(pI2c -> hIntEvent, I2C_SWRITE_TIMEOUT) == WAIT_TIMEOUT ){
SetLastError( I2C_TIMEOUT );
goto write_failure;
}
try {
sier.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SIER, sier.AsDWORD);
scr.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SCR, scr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
goto write_failure;
}
return pI2c -> data -> dwPoint;
write_failure:
try {
sier.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SIER, sier.AsDWORD);
scr.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SCR, scr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
}
return 0;
}
DWORD
I2C_SlaveRead(
PI2C_OPEN_INFO pOpen,
LPCVOID pBuf,
DWORD dwLen
)
{
DWORD Length;
PBYTE pRead = (PBYTE)pBuf;
RegSCR scr;
//RegSSR ssr;
RegSIER sier;
PI2C_DRIVER_INFO pI2c = pOpen -> pI2CHandle;
if ( InitializeI2C(pOpen, pOpen -> dwBaudrate) == FALSE )
return 0;
try {
WRITE_REGISTER_ULONG(pI2c -> SAR, *pRead);
scr.AsDWORD = 0;
scr.bits.SIE = 1;
if ( pOpen -> bSingleStage == TRUE ){
scr.bits.SDBS = 1;
}else{
scr.bits.SDBS = 0;
}
WRITE_REGISTER_ULONG(pI2c -> SCR, scr.AsDWORD);
pI2c -> data -> dwType = I2C_SLAVE_RX;
pI2c -> data -> dwPoint = 0;
pI2c -> data -> dwCount = dwLen;
sier.AsDWORD = 0;
sier.bits.SARE = 1;
sier.bits.SDRE = 1;
sier.bits.SSRE = 1;
WRITE_REGISTER_ULONG(pI2c -> SIER, sier.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
ResetEvent( pI2c -> hIntEvent );
if ( WaitForSingleObject(pI2c -> hIntEvent, I2C_SREAD_TIMEOUT) != WAIT_TIMEOUT ){
for( Length = 0;Length < pI2c -> data -> dwPoint;Length ++ ){
*(pRead++) = pI2c -> data -> bBuffer[Length];
}
}else{
SetLastError(I2C_TIMEOUT);
Length = 0;
}
try {
sier.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SIER, sier.AsDWORD);
scr.AsDWORD = 0;
WRITE_REGISTER_ULONG(pI2c -> SCR, scr.AsDWORD);
} except (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
return 0;
}
return Length;
}
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