/**************************************************************************************************
Function:
static BOOL I2CShared_TransmitOneByte(const I2C_MODULE i2c, const UINT8 data)
Author(s):
mkobit
Summary:
Transmits one byte of data to (i2c)
Description:
Waits until transmitter is ready and sends the byte of data
Static function, used by internal library
Preconditions:
Transaction started
I2C module configured
Parameters:
const I2C_MODULE i2c - I2C module to be used for this transaction
const UINT8 data - to be transmitted
Returns:
TRUE - If successful
FALSE - If unsuccessful
Example:
<code>
I2CShared_TransmitOneByte(I2C1, 0x43)
</code>
Conditions at Exit:
Transmission of byte complete
I2C bus waiting for next action
**************************************************************************************************/
static BOOL I2CShared_TransmitOneByte(const I2C_MODULE i2c, const UINT8 data) {
int fault_count = 0;
// Wait for the transmitter to be ready
while(!I2CTransmitterIsReady(i2c)) {
if (fault_count++ == TIMEOUT) {
//printf("I2CShared_TransmitOneByte: Timeout waiting for I2CTransmitterIsReady\n");
return FALSE;
}
}
// Transmit the byte
if(I2CSendByte(i2c, data) == I2C_MASTER_BUS_COLLISION)
{
//printf("I2CShared_TransmitOneByte: Error, I2C Master Bus Collision , status = 0x%x\n", I2CGetStatus(i2c));
return FALSE;
}
fault_count = 0;
// Wait for the transmission to finish
while(!I2CTransmissionHasCompleted(i2c)) {
if (fault_count++ == TIMEOUT) {
//printf("I2CShared_TransmitOneByte: Timeout waiting for I2CTransmissionHasCompleted\n");
return FALSE;
}
}
if(!I2CByteWasAcknowledged(i2c))
{
//printf("I2CShared_TransmitOneByte: Error, sent byte was not acknowledged, status = 0x%x\n", I2CGetStatus(i2c));
//I2CShared_DebugStatus(i2c);
return FALSE;
}
return TRUE;
}
/**
* Send out a single byte of data over the I2C
*
* @param data The byte of data to send
*/
bool I2C_TransmitOneByte(unsigned char data)
{
// Wait for the transmitter to be ready
while (!I2CTransmitterIsReady(I2C1));
// Transmit the byte
if (I2CSendByte(I2C1, data) == I2C_MASTER_BUS_COLLISION) {
//serialPrint("Error: I2C Master Bus Collision\r\n");
while (1);
}
// Wait for the transmission to finish
while (!I2CTransmissionHasCompleted(I2C1));
unsigned int i;
for (i = 0; i < I2C_Timeout; i++) {
if (I2CByteWasAcknowledged(I2C1)) {
break;
} else if (i == I2C_Timeout - 1) {
//serialPrint("Error: I2C Slave Did Not Acknowledge\r\n");
return FALSE;
}
}
return TRUE;
}
int transfer_start(I2C_MODULE port, I2C_7_BIT_ADDRESS address, UINT8 rw)
{
I2C_STATUS status;
int result = 0;
while(!I2CBusIsIdle(port));
if(I2CStart(port) != I2C_SUCCESS)
return -1;
do {
status = I2CGetStatus(port);
} while(!(status & I2C_START));
/* Send address */
address.rw = rw;
result = transmit_byte(port, address.byte);
if(result < 0)
return result;
if(!I2CByteWasAcknowledged(port))
return -1;
return result;
}
}void i2cSendByte(I2C_MODULE id, BYTE data){
while(!I2CTransmitterIsReady(id));//maybe comment this out
I2CSendByte(id, data);
//I2C_RESULT temp = I2CSendByte(id, data);
//temp;
while(!I2CTransmissionHasCompleted(id));
while(!I2CByteWasAcknowledged(id));
}
BOOL I2C_sendData(I2C_MODULE I2C_ID, uint8_t data){
// Initiate a single byte transmit over the I2C bus
if (!I2C_transmitOneByte(I2C_ID,data)){
return FALSE;
}
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(I2C_ID)){
#ifdef DEBUG
printf("Error: Sent byte was not acknowledged\n");
#endif
return FALSE;
}
return TRUE;
}
//------------------------------------------------------------------------------
// Function: I2C_WriteBlock
// Description: Write a block of bytes to the spacifed I2C slave address at the specified offset.
// The offset address is one byte (8 bit offset only).
// The return code is always 0. There is no indication in case of error.
//------------------------------------------------------------------------------
BYTE I2C_WriteBlock(BYTE deviceID, BYTE offset, BYTE buffer, WORD length)
{
BYTE write_buffer[256];
// memset(write_buffer, 0, sizeof(write_buffer));
WORD count;
BOOL Success = TRUE;
write_buffer[0] = deviceID;
write_buffer[1] = offset;
write_buffer[2] = buffer;
write_buffer[3] = 0x06;
// Start the transfer to write data to the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit all data
count = 0;
while( Success && (count < (length + 2)) )
{
// Transmit a byte
TransmitOneByte(write_buffer[count]);
// Advance to the next byte
count++;
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(OVM7690_I2C_BUS))
{
Success = FALSE;
}
}
// End the transfer (hang here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
return(0);
}
int gestic_message_write(gestic_t *gestic, void *msg, int size)
{
I2C_MODULE port = gestic->io.I2cPort;
const unsigned char * const buffer = (unsigned char*)msg;
int result = 0;
int i;
GESTIC_ASSERT(buffer[0] == size);
if(transfer_start(port, gestic->io.I2cSlaveAddr, 0))
result = -1;
for(i = 0; !result && i < size; ++i) {
if(transmit_byte(port, buffer[i]) < 0)
result = -1;
if(!I2CByteWasAcknowledged(port))
result = -1;
}
transfer_stop(port);
return result;
}
//------------------------------------------------------------------------------
// Function: I2C_ReadBlock
// Description: Read a block of bytes from the spacifed I2C slave address at the specified offset.
// The offset address is one byte (8 bit offset only).
// The return code is always 0. There is no indication in case of error.
//------------------------------------------------------------------------------
BYTE I2C_ReadBlock(BYTE deviceID, BYTE offset, BYTE *buffer, WORD length)
{
BYTE write_buffer[2] = {0x00};
BYTE count =0;
BOOL Success = TRUE;
write_buffer[0] = deviceID;
write_buffer[1] = offset;
// Start the transfer to write data to the EEPROM
if(!StartTransfer(FALSE) )
{
while(1);
}
// Transmit all data
count = 0;
while( Success && (count < (2)) )
{
// Transmit a byte
TransmitOneByte(write_buffer[count]);
// Advance to the next byte
count++;
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(OVM7690_I2C_BUS))
{
Success = FALSE;
}
}
// Start the transfer to read data
StartTransfer(TRUE);
// Transmit the address with the READ bit set
deviceID |= 0x01;
TransmitOneByte(deviceID);
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(OVM7690_I2C_BUS))
{
Success = FALSE;
}
for(count=0;count<length;count++)
{
// Read the data from the desired address
if(Success)
{
if(I2CReceiverEnable(OVM7690_I2C_BUS, TRUE) == I2C_RECEIVE_OVERFLOW)
{
Success = FALSE;
}
else
{
// while(!I2CReceivedDataIsAvailable(OVM7690_I2C_BUS));
*buffer++ = I2CGetByte(OVM7690_I2C_BUS);
}
}
}
// End the transfer (stop here if an error occured)
StopTransfer();
return(0);
}
/*
Sends a byte on an i2c channel (with no strings attached)
*/
void sendByte(I2C_MODULE i2c, BYTE byte){
I2CSendByte(i2c, byte); // Send and wait for finish
while( ! I2CTransmissionHasCompleted(i2c));
while( ! (I2CByteWasAcknowledged(i2c))); // wait for ack
}
void SendPacket( UINT8* i2cData, int DataSz )
{
int Index;
UINT32 actualClock;
BOOL Acknowledged;
BOOL Success = TRUE;
UINT8 i2cbyte;
// Start the transfer to write data to the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit all data
Index = 0;
while( Success && (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
{
// Advance to the next byte
Index++;
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
else
{
Success = FALSE;
}
}
// End the transfer (hang here if an error occured)
StopTransfer();
if(!Success)
{
ErrorHalt();
}
// Wait for EEPROM to complete write process, by polling the ack status.
Acknowledged = FALSE;
do
{
// Start the transfer to address the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit just the EEPROM's address
if (TransmitOneByte(i2cData[0]))
{
// Check to see if the byte was acknowledged
Acknowledged = I2CByteWasAcknowledged(EEPROM_I2C_BUS);
}
else
{
Success = FALSE;
}
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
ErrorHalt();
}
} while (Acknowledged != TRUE);
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
ErrorHalt();
}
}
int main(void)
{
UINT8 i2cData[10];
I2C_7_BIT_ADDRESS SlaveAddress;
int Index;
int DataSz;
UINT32 actualClock;
BOOL Acknowledged;
BOOL Success = TRUE;
UINT8 i2cbyte;
// Initialize debug messages (when supported)
DBINIT();
// Set the I2C baudrate
actualClock = I2CSetFrequency(EEPROM_I2C_BUS, GetPeripheralClock(), I2C_CLOCK_FREQ);
if ( abs(actualClock-I2C_CLOCK_FREQ) > I2C_CLOCK_FREQ/10 )
{
DBPRINTF("Error: I2C1 clock frequency (%u) error exceeds 10%%.\n", (unsigned)actualClock);
}
// Enable the I2C bus
I2CEnable(EEPROM_I2C_BUS, TRUE);
//
// Send the data to EEPROM to program one location
//
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = 0x05; // EEPROM location to program (high address byte)
i2cData[2] = 0x40; // EEPROM location to program (low address byte)
i2cData[3] = 0xAA; // Data to write
DataSz = 4;
// Start the transfer to write data to the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit all data
Index = 0;
while( Success && (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
{
// Advance to the next byte
Index++;
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
else
{
Success = FALSE;
}
}
// End the transfer (hang here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
// Wait for EEPROM to complete write process, by polling the ack status.
Acknowledged = FALSE;
do
{
// Start the transfer to address the EEPROM
if( !StartTransfer(FALSE) )
{
while(1);
}
// Transmit just the EEPROM's address
if (TransmitOneByte(SlaveAddress.byte))
{
// Check to see if the byte was acknowledged
Acknowledged = I2CByteWasAcknowledged(EEPROM_I2C_BUS);
}
else
{
Success = FALSE;
}
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
} while (Acknowledged != TRUE);
//
// Read the data back from the EEPROM.
//
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = 0x05; // EEPROM location to read (high address byte)
i2cData[2] = 0x40; // EEPROM location to read (low address byte)
DataSz = 3;
// Start the transfer to read the EEPROM.
if( !StartTransfer(FALSE) )
{
while(1);
}
// Address the EEPROM.
Index = 0;
while( Success & (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
{
// Advance to the next byte
Index++;
}
else
{
Success = FALSE;
}
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
// Restart and send the EEPROM's internal address to switch to a read transfer
if(Success)
{
// Send a Repeated Started condition
if( !StartTransfer(TRUE) )
{
while(1);
}
// Transmit the address with the READ bit set
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, EEPROM_ADDRESS, I2C_READ);
if (TransmitOneByte(SlaveAddress.byte))
{
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(EEPROM_I2C_BUS))
{
DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
}
}
else
{
Success = FALSE;
}
}
// Read the data from the desired address
if(Success)
{
if(I2CReceiverEnable(EEPROM_I2C_BUS, TRUE) == I2C_RECEIVE_OVERFLOW)
{
DBPRINTF("Error: I2C Receive Overflow\n");
Success = FALSE;
}
else
{
while(!I2CReceivedDataIsAvailable(EEPROM_I2C_BUS));
i2cbyte = I2CGetByte(EEPROM_I2C_BUS);
}
}
// End the transfer (stop here if an error occured)
StopTransfer();
if(!Success)
{
while(1);
}
// Validate the data read
if( i2cbyte != 0xAA )
{
DBPRINTF("Error: Verify failed\n");
}
else
{
DBPRINTF("Success\n");
}
// Example complete
while(1);
}
//=============================================
// Configure the I2C4 interrupt handler
//=============================================
void __ISR(_I2C_4_VECTOR, I2C4_INT_PRIORITY) I2c4InterruptHandler(void)
{
sI2cCmdBuffer_t masterData;
if (INTGetFlag(INT_I2C4B)) //Bus Collision interrupt
{
INTClearFlag(INT_I2C4B);
}
if (INTGetFlag(INT_I2C4M)) // Master interrupt
{
INTClearFlag(INT_I2C4M);
if (I2c.Var.oReadDataInNextInterrupt[I2C4]) // If a read was started last interrupt
{
masterData.data = I2C4RCV; // Read from I2C buffer
masterData.state = I2C_MASTER_RECEIVE_DATA;
I2cFifoWrite((void *) &I2c.Var.i2cUserFifo[I2C4], &masterData);
I2c.Var.oRxDataAvailable[I2C4] = 1;
I2c.Var.oReadDataInNextInterrupt[I2C4] = 0;
}
if (I2c.Var.oI2cWriteIsRunning[I2C4])
{
I2cFifoRead((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
switch (masterData.state)
{
//======================================================
case I2C_MASTER_RECEIVE_DATA :
I2C4CONbits.RCEN = 1; //Receive byte sequence
I2c.Var.oReadDataInNextInterrupt[I2C4] = 1; // Flag for the next interrupt to read the rx buffer
break;
//======================================================
//======================================================
case I2C_MASTER_START_CONDITION :
I2C4CONbits.SEN = 1; //start condition sequence
break;
//======================================================
//======================================================
case I2C_MASTER_STOP_CONDITION :
I2C4CONbits.PEN = 1;
if (I2c.Var.oPoolSlaveAcknowledge[I2C4])
{
if (!I2c.Var.oSecondStopAfterPooling[I2C4])
{
masterData.state = I2C_MASTER_START_CONDITION;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
masterData.state = I2C_MASTER_TRANSMIT_DATA;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
masterData.state = I2C_MASTER_STOP_CONDITION;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
I2c.Var.oSecondStopAfterPooling[I2C4] = 1;
}
else
{
if (!I2CByteWasAcknowledged(I2C4))
{
masterData.state = I2C_MASTER_START_CONDITION;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
masterData.state = I2C_MASTER_TRANSMIT_DATA;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
masterData.state = I2C_MASTER_STOP_CONDITION;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
}
else
{
masterData.state = I2C_MASTER_DONE;
I2cFifoWrite((void *) &I2c.Var.i2cWriteQueue[I2C4], &masterData);
I2c.Var.oSecondStopAfterPooling[I2C4] = 0;
}
}
}
break;
//======================================================
//======================================================
case I2C_MASTER_TRANSMIT_DATA :
I2C4TRN = masterData.data;
break;
//======================================================
//======================================================
case I2C_MASTER_DONE :
if (I2c.Var.i2cWriteQueue[I2C4].bufEmpty) // Nothing more to send
{
I2c.Var.oI2cWriteIsRunning[I2C4] = 0; // Turn off writing process
}
else
{
INTSetFlag(INT_I2C4M); // Start another writing process
}
break;
//======================================================
//======================================================
case I2C_MASTER_REPEAT_START :
I2C4CONbits.RSEN = 1; //repeated start condition sequence
break;
//======================================================
//======================================================
case I2C_MASTER_SLAVE_SENT_STOP :
LED_ERROR_ON;
break;
//======================================================
//======================================================
case I2C_MASTER_SEND_ACK :
I2C4CONbits.ACKDT = 0; //ACK
I2C4CONbits.ACKEN = 1; //Send ACK sequence
break;
//======================================================
//======================================================
case I2C_MASTER_SEND_NACK :
I2C4CONbits.ACKDT = 1; //NACK
I2C4CONbits.ACKEN = 1; //Send NACK sequence
break;
//======================================================
//======================================================
case I2C_CMD_ERROR :
LED_ERROR_ON;
break;
//======================================================
//======================================================
default :
break;
//======================================================
} // end switch
} // end if
if (I2c.Var.oI2cReadIsRunning[I2C4])
{
I2cFifoRead((void *) &I2c.Var.i2cReadQueue[I2C4], &masterData);
switch (masterData.state)
{
//======================================================
case I2C_MASTER_RECEIVE_DATA :
I2C4CONbits.RCEN = 1; //Receive byte sequence
I2c.Var.oReadDataInNextInterrupt[I2C4] = 1;
break;
//======================================================
//======================================================
case I2C_MASTER_START_CONDITION :
I2C4CONbits.SEN = 1; //start condition sequence
break;
//======================================================
//======================================================
case I2C_MASTER_REPEAT_START :
I2C4CONbits.RSEN = 1; //repeated start condition sequence
break;
//======================================================
//======================================================
case I2C_MASTER_STOP_CONDITION :
I2C4CONbits.PEN = 1;
break;
//======================================================
//======================================================
case I2C_MASTER_TRANSMIT_DATA :
I2C4TRN = masterData.data;
break;
//======================================================
//======================================================
case I2C_MASTER_DONE :
if (I2c.Var.i2cReadQueue[I2C4].bufEmpty) // Nothing more to send
{
I2c.Var.oI2cReadIsRunning[I2C4] = 0; // Turn off reading process
}
else
{
INTSetFlag(INT_I2C4M); // Start another reading process
}
break;
//======================================================
//======================================================
case I2C_MASTER_SLAVE_SENT_STOP :
LED_ERROR_ON;
break;
//======================================================
//======================================================
case I2C_MASTER_SEND_ACK :
I2C4CONbits.ACKDT = 0; //ACK
I2C4CONbits.ACKEN = 1; //Send ACK sequence
break;
//======================================================
//======================================================
case I2C_MASTER_SEND_NACK :
I2C4CONbits.ACKDT = 1; //NACK
I2C4CONbits.ACKEN = 1; //Send NACK sequence
break;
//======================================================
//======================================================
case I2C_CMD_ERROR :
LED_ERROR_ON;
break;
//======================================================
//======================================================
default :
break;
//======================================================
} // end switch
} // end if
} // end if
} // end if
void i2c_isr(uint8_t p) {
I2CModule_t * mod;
// Get a reference to the module structure
switch (p) {
case I2C2:
mod = &I2C_2;
break;
default:
return;
}
switch (mod->state) {
case IDLE:
break;
case START:
I2CStart(mod->moduleName);
mod->state = ADDRESS;
I2C_2.dataDirection = WRITING;
break;
case ADDRESS:
switch (mod->dataDirection) {
case READING:
I2CSendByte(mod->moduleName, mod->frame->address + 1);
mod->state = CHECK_ACK;
break;
case WRITING:
I2CSendByte(mod->moduleName, mod->frame->address);
mod->state = CHECK_ACK;
break;
}
break;
case CHECK_ACK:
if (I2CByteWasAcknowledged(mod->moduleName) == True) {
switch (mod->dataDirection) {
case READING:
mod->state = READ;
break;
case WRITING:
mod->state = WRITE;
break;
}
} else {
mod->frame->success = False;
mod->state = STOP;
}
i2c_isr(mod->moduleName);
break;
case RESTART:
I2CRepeatStart(mod->moduleName);
mod->dataDirection = READING;
mod->state = ADDRESS;
break;
case READ_START:
I2CReceiverEnable(mod->moduleName, TRUE);
mod->state = READ;
break;
case READ:
mod->frame->rx_buf[mod->frame->rx_buf_index++] = I2CGetByte(mod->moduleName);
// If we need to read more bytes send an ACK
if (mod->frame->rx_buf_index <= mod->frame->bytesToRead) {
I2CAcknowledgeByte(mod->moduleName, True); // Send an ACK
mod->state = READ_START; // Prepare for the next byte
} else {
I2CAcknowledgeByte(mod->moduleName, False); // Send a NACK
mod->frame->success = True;
mod->state = STOP; // Prepare for a stop condition
}
break;
case WRITE:
// If there are still bytes to send
if (mod->frame->tx_buf_index < mod->frame->tx_buf_size) {
I2CSendByte(mod->moduleName, mod->frame->tx_buf[mod->frame->tx_buf_index++]);
} else {
// If we need to read some bytes
if (mod->frame->bytesToRead > 0) {
mod->state = RESTART; // Send a restart condition
} else {
mod->frame->success = True;
mod->state = STOP; // Send a stop condition
}
i2c_isr(mod->moduleName); // Re-run this function to call stop/restart
// TODO: Perhaps there is a better way to do this..!
}
break;
case STOP:
I2CStop(mod->moduleName);
mod->frameToSend = False;
mod->state = IDLE;
// Tell the owner of the frame that it has complete or failed
if (mod->frame->success == True) {
mod->frame->callback();
} else {
mod->frame->error();
}
break;
case BUSERROR:
led12 = 1;
// TODO: Something..!
while(1); // Don't know what to do here yet..!
break;
}
}
//------------------------------------------------------------------------------
// Function: I2C_ReadBlock
// Description: Read a block of bytes from the spacifed I2C slave address at the specified offset.
// The offset address is one byte (8 bit offset only).
// The return code is always 0. There is no indication in case of error.
//------------------------------------------------------------------------------
uint8_t I2C_ReadBlock(uint8_t deviceID, uint8_t offset, uint8_t *buffer, uint16_t length)
{
uint8_t write_buffer[2] = {0x00};
uint8_t count =0;
bool Success = true;
write_buffer[0] = deviceID;
write_buffer[1] = offset;
I2C1CONbits.ACKDT = 0;
// Start the transfer to write data to the EEPROM
if(!StartTransfer(false) )
{
return(1);
}
// Transmit the address with the READ bit set
deviceID |= 0x01;
TransmitOneByte(deviceID);
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged(OVM7690_I2C_BUS))
{
Success = false;
return(1);
}
for(count=0;count<length;count++)
{
// Read the data from the desired address
if(I2CReceiverEnable(OVM7690_I2C_BUS, true) == I2C_RECEIVE_OVERFLOW)
{
Success = false;
return(1);
}
else
{
while(!I2CReceivedDataIsAvailable(OVM7690_I2C_BUS));
*buffer = I2C1RCV;
buffer++;
if(count == (length-1))
{
// I2C1CONbits.ACKDT = 1;
I2C1CONSET = 0x20;
}
I2C1CONbits.ACKEN = 1; // initiate bus acknowledge sequence
while(I2C1CONbits.ACKEN == 1);
}
}
// End the transfer (stop here if an error occured)
StopTransfer();
return(0);
}
BOOL MPU6050::writeReg(UINT8 regAddress, UINT8 data)
{
UINT8 i2cData[10];
I2C_7_BIT_ADDRESS SlaveAddress;
int Index;
int DataSz;
BOOL Acknowledged = FALSE;
BOOL Success = TRUE;
//sprintf(filename, "Starting writeReg().\n");
//putsUART1( filename );
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, this->deviceAddress, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = regAddress; // Register Address to write
i2cData[2] = data; // Data to write
DataSz = 3;
// Start the transfer
if( !StartTransfer(FALSE) )
{
Success = FALSE;
sprintf( filename, "Error in #1 StartTransfer(): when writing address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
// Transmit all data
Index = 0;
while( Success && (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index++]))
{
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged( this->i2cBusId ))
{
Success = FALSE;
sprintf( filename, "Error in #1 I2CByteWasAcknowledged(): when writing address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
else
{
Success = FALSE;
sprintf( filename, "Error in #1 TransmitOneByte(): when writing address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
//sprintf(filename, "Before StopTransfer()\n");
//putsUART1( filename );
// End the transfer
StopTransfer();
//sprintf(filename, "After StopTransfer()\n");
//putsUART1( filename );
// Wait for device to complete write process, by polling the ack status.
while(Acknowledged != TRUE && Success != FALSE)
{
//sprintf(filename, "Inside the loop\n");
//putsUART1( filename );
// Start the transfer
if( StartTransfer(FALSE) )
{
// Transmit just the device's address
if (TransmitOneByte(SlaveAddress.byte))
{
// Check to see if the byte was acknowledged
Acknowledged = I2CByteWasAcknowledged( this->i2cBusId );
/*if( !Acknowledged )
{
sprintf( filename, "!Acknowledged %u.\n", (unsigned)regAddress );
putsUART1( filename );
}*/
}
else
{
Success = FALSE;
sprintf( filename, "Error in #2 TransmitOneByte() - !starttranfer : when writing address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
// End the transfer
StopTransfer();
}
else
{
Success = FALSE;
sprintf( filename, "Error in #2 StartTransfer(): when writing address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
//sprintf(filename, "After the loop\n");
//putsUART1( filename );
if( !Success )
{
sprintf( filename, "Error in writeReg(): when writing to address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
return Success;
}
BOOL MPU6050::readReg( UINT8 regAddress, UINT8 &data )
{
// Variable declarations
UINT8 i2cData[10];
I2C_7_BIT_ADDRESS SlaveAddress;
int Index;
int DataSz;
BOOL Acknowledged;
BOOL Success = TRUE;
UINT8 i2cbyte;
// Initialize the data buffer
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, this->deviceAddress, I2C_WRITE);
i2cData[0] = SlaveAddress.byte;
i2cData[1] = regAddress; // MPU6050 data address to read (0x75 = WHO_AM_I which contains 0x68)
DataSz = 2;
// Start the transfer
if( !StartTransfer(FALSE) )
{
//while(1);
Success = FALSE;
sprintf( filename, "Error in #1 StartTransfer(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
// Address the device.
Index = 0;
while( Success & (Index < DataSz) )
{
// Transmit a byte
if (TransmitOneByte(i2cData[Index]))
Index++;
else
{
Success = FALSE;
sprintf( filename, "Error in #1 TransmitOneByte(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged( this->i2cBusId ))
{
//DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
sprintf( filename, "Error in #1 I2CByteWasAcknowledged(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
// Restart and send the device's internal address to switch to a read transfer
if(Success)
{
// Send a Repeated Started condition
if( !StartTransfer(TRUE) )
{
//while(1);
Success = FALSE;
sprintf( filename, "Error in #2 StartTransfer(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
// Transmit the address with the READ bit set
I2C_FORMAT_7_BIT_ADDRESS(SlaveAddress, this->deviceAddress, I2C_READ);
if (TransmitOneByte(SlaveAddress.byte))
{
// Verify that the byte was acknowledged
if(!I2CByteWasAcknowledged( this->i2cBusId ))
{
//DBPRINTF("Error: Sent byte was not acknowledged\n");
Success = FALSE;
sprintf( filename, "Error in #2 I2CByteWasAcknowledged(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
else
{
Success = FALSE;
sprintf( filename, "Error in #2 TransmitOneByte(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
}
//i2cbyte = 9;
// Read the data from the desired address
if(Success)
{
if(I2CReceiverEnable( this->i2cBusId , TRUE) == I2C_RECEIVE_OVERFLOW)
{
//DBPRINTF("Error: I2C Receive Overflow\n");
Success = FALSE;
sprintf( filename, "Error I2CReceiverEnable(): when reading address %u. I2C Receive Overflow.\n", (unsigned)regAddress );
putsUART1( filename );
}
else
{
while(!I2CReceivedDataIsAvailable( this->i2cBusId ));
i2cbyte = I2CGetByte( this->i2cBusId );
}
}
// End the transfer
StopTransfer();
data = i2cbyte;
if(!Success)
{
//mPORTBSetBits(BIT_2);
//mPORTBClearBits(BIT_3);
sprintf( filename, "Error in readReg(): when reading address %u.\n", (unsigned)regAddress );
putsUART1( filename );
}
return Success;
}