void TwoWire::end() {
DTWI::I2C_STATUS status = di2c.getStatus();
if(beginCount == 0)
{
return;
}
destroyTask(getTaskId(onI2C));
beginCount = 0;
if(status.fMaster)
{
di2c.endMaster();
}
else if(status.fSlave)
{
// forcefully end the slave
di2c.endSlave(true);
}
// clean out the read / write buffer
di2c.abort();
di2c.discard();
}
uint8_t TwoWire::endTransmission(uint8_t fStopBit)
{
if(fStopBit)
{
while(!di2c.stopMaster());
}
return(true);
}
uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
{
DTWI::I2C_STATUS status;
// may have to wait for the last action to finish before
// a repeated start can occur
while(!di2c.startMasterRead(address, quantity));
do
{
status = di2c.getStatus();
} while(status.fMyBus && !status.fNacking);
while(!di2c.stopMaster());
return(di2c.available());
}
void TwoWire::begin(void)
{
if(beginCount == 0)
{
beginCount++;
// there are no callback in Master mode
destroyTask(getTaskId(onI2C));
di2c.beginMaster();
}
}
// must be called in:
// slave rx event callback
// or after requestFrom(address, numBytes)
uint8_t TwoWire::read(void)
{
byte data;
if(di2c.read(&data, 1) == 1)
{
return((uint8_t) data);
}
return('\0');
}
void TwoWire::begin(uint8_t address)
{
if(beginCount == 0)
{
beginCount++;
// make sure we put the callback in the task manager
beginSlave(onReceiveService, onRequestService);
di2c.beginSlave(address);
}
}
static void onI2C(int id, void * tptr)
{
DTWI::I2C_STATUS status = di2c.getStatus();
uint8_t data;
if(status.fSlave)
{
if(status.fRead)
{
while(di2c.available() > 0)
{
onReceiveServiceR(NULL, di2c.available());
}
}
// on writing out, we only call once when the
// new session starts
else if(status.fWrite && iSessionCur != status.iSession)
{
iSessionCur = status.iSession;
onRequestServiceR();
}
}
}
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */ /************************************************************************/ /* Revision History: */ /* 8/4/2014(KeithV): Created */ /************************************************************************/ // DTWI is not on the path and we don't want the user to have // to explicitly include the library. So just grab it and compile it #include "../DTWI/DTWI.cpp" #define ENABLE_END #include <Wire.h> DTWI0 di2c; TwoWire Wire; // Initialize Class Variables ////////////////////////////////////////////////// uint8_t TwoWire::rxBuffer[BUFFER_LENGTH]; uint8_t TwoWire::rxBufferIndex = 0; uint8_t TwoWire::rxBufferLength = 0; uint8_t TwoWire::txAddress = 0; uint8_t TwoWire::txBuffer[BUFFER_LENGTH]; uint8_t TwoWire::txBufferIndex = 0; uint8_t TwoWire::txBufferLength = 0; uint8_t TwoWire::transmitting = 0; void (*TwoWire::user_onRequest)(void);
// must be called in:
// slave rx event callback
// or after requestFrom(address, numBytes)
uint8_t TwoWire::available(void)
{
return (di2c.available());
}
// must be called in:
// slave tx event callback
// or after beginTransmission(address)
int TwoWire::write(uint8_t* data, uint8_t quantity)
{
return(di2c.write((const byte *) data, quantity));
}
// must be called in:
// slave tx event callback
// or after beginTransmission(address)
int TwoWire::write(uint8_t data)
{
return(di2c.write((const byte *) &data, 1));
}
void TwoWire::beginTransmission(uint8_t address)
{
while(!di2c.startMasterWrite(address));
}
