//
// Originally, 'endTransmission' was an f(void) function.
// It has been modified to take one parameter indicating
// whether or not a STOP should be performed on the bus.
// Calling endTransmission(false) allows a sketch to
// perform a repeated start.
//
// WARNING: Nothing in the library keeps track of whether
// the bus tenure has been properly ended with a STOP. It
// is very possible to leave the bus in a hung state if
// no call to endTransmission(true) is made. Some I2C
// devices will behave oddly if they do not see a STOP.
//
uint8_t TwoWire::endTransmission(uint8_t sendStop)
{
/* Set direction to send for sending of address and data. */
uint8_t result = (uint8_t)getWriteError();
if(result != 0)
{
// reset tx buffer iterator vars
txBufferIndex = 0;
txBufferLength = 0;
// indicate that we are done transmitting
transmitting_master = false;
return 1;
}
uint32_t t0 = millis();
while(I2C_HAL_GetStatusFlag(instance, kI2CBusBusy) && !I2C_HAL_IsMaster(instance))
{
if(millis() - t0 >= 25)
return 4; //timeout
}
uint16_t slaveAddress;
slaveAddress = (txAddress << 1U) & 0x00FFU;
bool sent = sendAddress(slaveAddress);
//tx buffer also sent by interrupt
// reset tx buffer iterator vars
txBufferIndex = 0;
txBufferLength = 0;
// indicate that we are done transmitting
transmitting_master = false;
clearWriteError();
result = 4;
if(sent) //sent without timeout
{
if(master_state == MASTER_STATE_COMPLETE)
{
result = 0;
}
else if(master_state == MASTER_STATE_TX_NAK) //failed
{
result = (txBufferIndex == 0) ? 2 : 3; //address or data fail
sendStop = true;
}
if(sendStop)
{
I2C_HAL_SendStop(instance);
}
}
I2C_HAL_SetDirMode(instance, kI2CReceive);
return result;
}
//------------------------------------------------------------------------------
void FatStreamBase::putch(char c) {
if (c == '\n' && !(getmode() & ios::binary)) {
write('\r');
}
write(c);
if (getWriteError()) {
setstate(badbit);
}
}
// ------------------------------------------------------------------------------------------------------
// Get Wire Error - returns "Wire" error code from a failed Tx/Rx command
// return: 0=success, 1=data too long, 2=recv addr NACK, 3=recv data NACK, 4=other error
// (Note: error code 1 (data too long) is only valid after Tx, if it appears after Rx then it was set by a previous Tx)
//
uint8_t i2c_t3::getError(void)
{
// convert status to Arduino return values (give these a higher priority than buf overflow error)
switch(i2c->currentStatus)
{
case I2C_ADDR_NAK: return 2;
case I2C_DATA_NAK: return 3;
case I2C_ARB_LOST: return 4;
case I2C_TIMEOUT: return 4;
default: break;
}
if(getWriteError()) return 1; // if write_error was set then flag as buffer overflow
return 0; // no errors
}
//------------------------------------------------------------------------------
void FatStreamBase::putstr(const char* str) {
size_t n = 0;
while (1) {
char c = str[n];
if (c == '\0' || (c == '\n' && !(getmode() & ios::binary))) {
if (n > 0) {
write(str, n);
}
if (c == '\0') {
break;
}
write('\r');
str += n;
n = 0;
}
n++;
}
if (getWriteError()) {
setstate(badbit);
}
}
