unsigned char I2C_read_byte(unsigned char slave_address, unsigned char reg_address)
{
unsigned char DATA;
//DISABLE INTERRUPTS
//ROM_IntDisable(I2C0_BASE);
ROM_I2CMasterSlaveAddrSet(I2C0_BASE, slave_address, false);
//BufferIn(reg_address);
ROM_I2CMasterDataPut(I2C0_BASE, reg_address);
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(ROM_I2CMasterBusy(I2C0_BASE));
ROM_I2CMasterSlaveAddrSet(I2C0_BASE, slave_address, true);
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
while(ROM_I2CMasterBusy(I2C0_BASE))
{
}
DATA = ROM_I2CMasterDataGet(I2C0_BASE);
//ENABLE INTERRUPTS
//ROM_IntEnable(I2C0_BASE);
return DATA;
}
void I2C_Read_Packet_From_Sensor(int *readData,unsigned char slave_add,int dataLength,unsigned char offset)
{
unsigned char j;
//DISABLE INTERRUPTS
//ROM_IntDisable(I2C0_BASE);
ROM_I2CMasterSlaveAddrSet(I2C0_BASE, slave_add, false);
//BufferIn(reg_address);
// SysCtlDelay(53333);
ROM_I2CMasterDataPut(I2C0_BASE, offset);
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START);
//SysCtlDelay(53333);
while(ROM_I2CMasterBusy(I2C0_BASE));
ROM_I2CMasterSlaveAddrSet(I2C0_BASE, slave_add, true);
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
while(ROM_I2CMasterBusy(I2C0_BASE));
readData[0] = ROM_I2CMasterDataGet(I2C0_BASE);
if(dataLength>1){
for(j = 1 ; j < dataLength - 1 ; j++ )
{
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
while(ROM_I2CMasterBusy(I2C0_BASE));
readData[j] = ROM_I2CMasterDataGet(I2C0_BASE);
}
ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
while(ROM_I2CMasterBusy(I2C0_BASE));
readData[dataLength-1] = ROM_I2CMasterDataGet(I2C0_BASE);
}
//ROM_IntEnable(I2C0_BASE);
// SysCtlDelay(53333);
}
uint8_t TwoWire::sendTxData(unsigned long cmd, uint8_t data) {
while(ROM_I2CMasterBusy(MASTER_BASE));
ROM_I2CMasterDataPut(MASTER_BASE, data);
HWREG(MASTER_BASE + I2C_O_MCS) = cmd;
while(ROM_I2CMasterBusy(MASTER_BASE));
uint8_t error = ROM_I2CMasterErr(MASTER_BASE);
if (error != I2C_MASTER_ERR_NONE)
ROM_I2CMasterControl(MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_ERROR_STOP);
return(getError(error));
}
uint8_t TwoWire::endTransmission(uint8_t sendStop)
{
uint8_t error = I2C_MASTER_ERR_NONE;
if(TX_BUFFER_EMPTY) return 0;
//Wait for any previous transaction to complete
while(ROM_I2CMasterBusBusy(MASTER_BASE));
while(ROM_I2CMasterBusy(MASTER_BASE));
//Select which slave we are requesting data from
//false indicates we are writing to the slave
ROM_I2CMasterSlaveAddrSet(MASTER_BASE, txAddress, false);
while(ROM_I2CMasterBusy(MASTER_BASE));
unsigned long cmd = RUN_BIT | START_BIT;
error = sendTxData(cmd,txBuffer[txReadIndex]);
txReadIndex = (txReadIndex + 1) % BUFFER_LENGTH;
if(error) return error;
while(!TX_BUFFER_EMPTY) {
error = sendTxData(RUN_BIT,txBuffer[txReadIndex]);
txReadIndex = (txReadIndex + 1) % BUFFER_LENGTH;
if(error) return getError(error);
}
if(txWriteRomQuantity!=0) // Hey we have Rom Block data to transmit!
{
while(txWriteRomIndex != txWriteRomQuantity)
{
uint8_t c = *PtrTxRomBuffer++;
error = sendTxData(RUN_BIT,c);
txWriteRomIndex++;
if(error) return getError(error);
}
txWriteRomQuantity=0; // Clear to disable further tx
}
if(sendStop) {
while(ROM_I2CMasterBusy(MASTER_BASE));
HWREG(MASTER_BASE + I2C_O_MCS) = STOP_BIT;
while(ROM_I2CMasterBusy(MASTER_BASE));
currentState = IDLE;
}
else {
currentState = MASTER_TX;
}
// indicate that we are done transmitting
transmitting = 0;
return error;
}
uint8_t TwoWire::getRxData(unsigned long cmd) {
if (currentState == IDLE) while(ROM_I2CMasterBusBusy(MASTER_BASE));
HWREG(MASTER_BASE + I2C_O_MCS) = cmd;
while(ROM_I2CMasterBusy(MASTER_BASE));
uint8_t error = ROM_I2CMasterErr(MASTER_BASE);
if (error != I2C_MASTER_ERR_NONE) {
ROM_I2CMasterControl(MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP);
}
else {
while(ROM_I2CMasterBusy(MASTER_BASE));
rxBuffer[rxWriteIndex] = ROM_I2CMasterDataGet(MASTER_BASE);
rxWriteIndex = (rxWriteIndex + 1) % BUFFER_LENGTH;
}
return error;
}
uint8_t TwoWire::endTransmission(uint8_t sendStop)
{
uint8_t error = I2C_MASTER_ERR_NONE;
digitalWrite(RED_LED, HIGH);
if(TX_BUFFER_EMPTY) return 0;
//Wait for any previous transaction to complete
while(ROM_I2CMasterBusBusy(MASTER_BASE)); // Here it hangs sometimes!
digitalWrite(RED_LED, LOW);
while(ROM_I2CMasterBusy(MASTER_BASE));
//Select which slave we are requesting data from
//false indicates we are writing to the slave
ROM_I2CMasterSlaveAddrSet(MASTER_BASE, txAddress, false);
while(ROM_I2CMasterBusy(MASTER_BASE));
unsigned long cmd = RUN_BIT | START_BIT;
error = sendTxData(cmd,txBuffer[txReadIndex]);
txReadIndex = (txReadIndex + 1) % BUFFER_LENGTH;
if(error) return error;
while(!TX_BUFFER_EMPTY) {
error = sendTxData(RUN_BIT,txBuffer[txReadIndex]);
txReadIndex = (txReadIndex + 1) % BUFFER_LENGTH;
if(error) return getError(error);
}
if(sendStop) {
while(ROM_I2CMasterBusy(MASTER_BASE));
HWREG(MASTER_BASE + I2C_O_MCS) = STOP_BIT;
while(ROM_I2CMasterBusy(MASTER_BASE));
currentState = IDLE;
}
else {
currentState = MASTER_TX;
}
// indicate that we are done transmitting
transmitting = 0;
return error;
}
void I2C_write(unsigned char slave_address,unsigned char reg_address,unsigned char data)
{
ROM_I2CMasterSlaveAddrSet(I2C0_BASE,slave_address,false);
ROM_I2CMasterDataPut(I2C0_BASE,reg_address);
ROM_I2CMasterControl(I2C0_BASE,I2C_MASTER_CMD_BURST_SEND_START);
while(ROM_I2CMasterBusy(I2C0_BASE));
//ROM_I2CMasterSlaveAddrSet(I2C0_BASE, slave_address, false);
ROM_I2CMasterDataPut(I2C0_BASE,data);
ROM_I2CMasterControl(I2C0_BASE,I2C_MASTER_CMD_BURST_SEND_FINISH);
}
uint8_t TwoWire::sendTxData(unsigned long cmd, uint8_t data) {
if(speedMode==I2C_SPEED_STANDARD) //Fast mode works without delay (Tested on stellaris&GY-80)
delayMicroseconds(SLOWMODE_DELAYUS);
ROM_I2CMasterDataPut(MASTER_BASE, data);
HWREG(MASTER_BASE + I2C_O_MCS) = cmd;
while(ROM_I2CMasterBusy(MASTER_BASE));
uint8_t error = ROM_I2CMasterErr(MASTER_BASE);
if (error != I2C_MASTER_ERR_NONE)
ROM_I2CMasterControl(MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_ERROR_STOP);
return(getError(error));
}
uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
{
uint8_t error = 0;
uint8_t oldWriteIndex = rxWriteIndex;
uint8_t spaceAvailable = (rxWriteIndex >= rxReadIndex) ?
BUFFER_LENGTH - (rxWriteIndex - rxReadIndex) : (rxReadIndex - rxWriteIndex);
if (quantity > spaceAvailable)
quantity = spaceAvailable;
if (!quantity) return 0;
//Select which slave we are requesting data from
//true indicates we are reading from the slave
ROM_I2CMasterSlaveAddrSet(MASTER_BASE, address, true);
unsigned long cmd = 0;
if((quantity > 1) || !sendStop)
cmd = RUN_BIT | START_BIT | ACK_BIT;
else cmd = RUN_BIT | START_BIT | (sendStop << 2);
error = getRxData(cmd);
if(error) return 0;
currentState = MASTER_RX;
for (int i = 1; i < quantity; i++) {
//since NACK is being sent on last byte, a consecutive burst read will
//need to send a start condition
if(i == (quantity - 1))
cmd = RUN_BIT;
else
cmd = RUN_BIT | ACK_BIT;
error = getRxData(cmd);
if(error) return i;
}
if(sendStop) {
HWREG(MASTER_BASE + I2C_O_MCS) = STOP_BIT;
while(ROM_I2CMasterBusy(MASTER_BASE));
currentState = IDLE;
}
uint8_t bytesWritten = (rxWriteIndex >= oldWriteIndex) ?
BUFFER_LENGTH - (rxWriteIndex - oldWriteIndex) : (oldWriteIndex - rxWriteIndex);
return(bytesWritten);
}
uint8_t TwoWire::getRxData(unsigned long cmd) {
if (currentState == IDLE) while(ROM_I2CMasterBusBusy(MASTER_BASE));
HWREG(MASTER_BASE + I2C_O_MCS) = cmd;
while(ROM_I2CMasterBusy(MASTER_BASE));
uint8_t error = ROM_I2CMasterErr(MASTER_BASE);
if (error != I2C_MASTER_ERR_NONE) {
ROM_I2CMasterControl(MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP);
}
else {
if(speedMode==I2C_SPEED_STANDARD) //Fast modes works without delay (Tested on stellaris&GY-80)
delayMicroseconds(SLOWMODE_DELAYUS);
rxBuffer[rxWriteIndex] = ROM_I2CMasterDataGet(MASTER_BASE);
rxWriteIndex = (rxWriteIndex + 1) % BUFFER_LENGTH;
}
return error;
}
//*****************************************************************************
//
//! Reads the I2C slave register.
//!
//! \param ACCEL_I2C_MASTER_BASE is the base for the I2C module.
//! \param SlaveID is the 7-bit address of the slave to be addressed.
//! \param addr is the register to read from.
//!
//! This function initiates a read from the slave device.
//! The ACCEL_I2C_MASTER_BASE parameter is the I2C modules master base address.
//! \e ACCEL_I2C_MASTER_BASE parameter can be one of the following values:
//!
//! \return Register value in an unsigned long format. Note that 0 will be
//! returned if there is ever an error, 1 if there was not.
//
//*****************************************************************************
uint8_t i2c_ReadByte(uint8_t SlaveID, uint8_t addr) {
unsigned long ulRegValue = 0;
// LED_TOGGLE(BLUE);
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(ACCEL_I2C_MASTER_BASE, SlaveID, 0);
//
// Place the command to be sent in the data register.
//
ROM_I2CMasterDataPut(ACCEL_I2C_MASTER_BASE, addr);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE, I2C_MASTER_CMD_SINGLE_SEND);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 2;
}
//
// Tell the master module what address it will place on the bus when
// reading from the slave.
//
ROM_I2CMasterSlaveAddrSet(ACCEL_I2C_MASTER_BASE, SlaveID, 1);
//
// Tell the master to read data.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
//
// Wait until master module is done receiving.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 1;
}
//
// Read the data from the master.
//
ulRegValue = ROM_I2CMasterDataGet(ACCEL_I2C_MASTER_BASE);
//
// Return the register value.
//
return 3;
// return ulRegValue;
}
int32_t i2c_WriteBuf(uint8_t SlaveID, uint8_t addr, int32_t nBytes,
uint8_t* pBuf) {
uint8_t nBytesCount; // local variable used for byte counting/state determination
uint16_t MasterOptionCommand; // used to assign the commands for ROM_I2CMasterControl() function
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(ACCEL_I2C_MASTER_BASE, SlaveID, false);
//
// Place the value to be sent in the data register.
//
ROM_I2CMasterDataPut(ACCEL_I2C_MASTER_BASE, addr);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE,
I2C_MASTER_CMD_BURST_SEND_START);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 0;
}
//
// Start with CONT for more than one byte to write
//
MasterOptionCommand = I2C_MASTER_CMD_BURST_SEND_CONT;
for (nBytesCount = 0; nBytesCount < nBytes; nBytesCount++) {
//
// The second and intermittent byte has to be send with CONTINUE control word
//
if (nBytesCount == 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_SEND_CONT;
//
// The last byte has to be send with FINISH control word
//
if (nBytesCount == nBytes - 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_SEND_FINISH;
//
// Re-configure to SINGLE if there is only one byte to write
//
if (nBytes == 1)
MasterOptionCommand = I2C_MASTER_CMD_SINGLE_SEND;
//
// Send data byte
//
ROM_I2CMasterDataPut(ACCEL_I2C_MASTER_BASE, pBuf[nBytesCount]);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE, MasterOptionCommand);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 0;
}
}
//
// Return 1 if there is no error.
//
return 1;
}
//*****************************************************************************
//
//! Writes to the specified I2C slave register.
//!
//! \param ACCEL_I2C_MASTER_BASE is the base for the I2C module.
//! \param SlaveID is the 7-bit address of the slave to be addressed.
//! \param addr is the register to write data to.
//! \param data is the 8-bit data to be written.
//!
//! This function initiates a read from the I2C slave device.
//! The ACCEL_I2C_MASTER_BASE parameter is the I2C modules master base address.
//! \e ACCEL_I2C_MASTER_BASE parameter can be one of the following values:
//!
//! \return Register value in an unsigned long format. Note that 0 will be
//! returned if there is ever an error, 1 if there was not.
//
//int32_t i2c_XmtByte(uint8_t SlaveID, uint8_t addr, uint8_t data);
//*****************************************************************************
int32_t i2c_WriteByte(uint8_t SlaveID, uint8_t addr, uint8_t data) {
// LED_TOGGLE(GREEN);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(ACCEL_I2C_MASTER_BASE, SlaveID, 0);
//
// Place the command to be sent in the data register.
//
ROM_I2CMasterDataPut(ACCEL_I2C_MASTER_BASE, addr);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE,
I2C_MASTER_CMD_BURST_SEND_START);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 0;
}
//
// Place the value to be sent in the data register.
//
ROM_I2CMasterDataPut(ACCEL_I2C_MASTER_BASE, data);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 0;
}
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ACCEL_I2C_MASTER_BASE,
I2C_MASTER_CMD_BURST_SEND_FINISH);
//
// Wait until master module is done transferring.
//
while (ROM_I2CMasterBusy(ACCEL_I2C_MASTER_BASE)) {
};
//
// Check for errors.
//
if (ROM_I2CMasterErr(ACCEL_I2C_MASTER_BASE) != I2C_MASTER_ERR_NONE) {
return 0;
}
//
// Return 1 if there is no error.
//
return 1;
}
//*****************************************************************************
//
//! Reads one/multiple bytes of data from an I2C slave device.
//!
//! \param ulI2CBase is the base for the I2C module.
//! \param ucSlaveAdress is the 7-bit address of the slave to be addressed.
//! \param ucReg is the register to start reading from.
//! \param cReadData is a pointer to the array to store the data.
//! \param uiSize is the number of bytes to read from the slave.
//!
//! This function reads one/multiple bytes of data from an I2C slave device.
//! The ulI2CBase parameter is the I2C modules master base address.
//! \e ulI2CBase parameter can be one of the following values:
//!
//! - \b I2C0_MASTER_BASE
//! - \b I2C1_MASTER_BASE
//! - \b I2C2_MASTER_BASE
//! - \b I2C3_MASTER_BASE
//!
//! \return 0 if there was an error or 1 if there was not.
//
//*****************************************************************************
unsigned long
I2CReadData(unsigned long ulI2CBase, unsigned char ucSlaveAdress,
unsigned char ucReg, char* cReadData, unsigned int uiSize)
{
unsigned int uibytecount; // local variable used for byte counting/state determination
int MasterOptionCommand; // used to assign the commands for ROM_I2CMasterControl() function
//
// Check the arguments.
//
ASSERT(I2CMasterBaseValid(ulI2CBase));
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(ulI2CBase, ucSlaveAdress, 0);
//
// Place the command to be sent in the data register.
//
ROM_I2CMasterDataPut(ulI2CBase, ucReg);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ulI2CBase, I2C_MASTER_CMD_SINGLE_SEND);
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(ulI2CBase) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Tell the master module what address it will place on the bus when
// reading from the slave.
//
ROM_I2CMasterSlaveAddrSet(ulI2CBase, ucSlaveAdress, true);
//
// Start with BURST with more than one byte to write
//
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_START;
for(uibytecount = 0; uibytecount < uiSize; uibytecount++)
{
//
// The second and intermittent byte has to be read with CONTINUE control word
//
if(uibytecount == 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_CONT;
//
// The last byte has to be send with FINISH control word
//
if(uibytecount == uiSize - 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_FINISH;
//
// Re-configure to SINGLE if there is only one byte to read
//
if(uiSize == 1)
MasterOptionCommand = I2C_MASTER_CMD_SINGLE_RECEIVE;
//
// Initiate read of data from the slave.
//
ROM_I2CMasterControl(ulI2CBase, MasterOptionCommand);
//
// Wait until master module is done reading.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(ulI2CBase) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Move byte from register
//
cReadData[uibytecount] = I2CMasterDataGet(ulI2CBase);
}
// send number of received bytes
return uibytecount;
}
unsigned long
I2CRegWrite(unsigned long ulI2CBase, unsigned char ucSlaveAdress,
unsigned char ucReg, unsigned char ucValue)
{
//
// Check the arguments.
//
ASSERT(I2CMasterBaseValid(ulI2CBase));
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(ulI2CBase, ucSlaveAdress, 0);
//
// Place the command to be sent in the data register.
//
ROM_I2CMasterDataPut(ulI2CBase, ucReg);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ulI2CBase, I2C_MASTER_CMD_BURST_SEND_START);
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(ulI2CBase) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Place the value to be sent in the data register.
//
ROM_I2CMasterDataPut(ulI2CBase, ucValue);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ulI2CBase, I2C_MASTER_CMD_BURST_SEND_CONT);
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(ulI2CBase) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(ulI2CBase, I2C_MASTER_CMD_BURST_SEND_FINISH);
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(ulI2CBase))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(ulI2CBase) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Return 1 if there is no error.
//
return 1;
}
//*****************************************************************************
//
//! Reads one/multiple bytes of data from an I2C slave device.
//!
//! \param I2C_PORT is the base for the I2C module.
//! \param SlaveID is the 7-bit address of the slave to be addressed.
//! \param addr is the register to start reading from.
//! \param pBuf is a pointer to the array to store the data.
//! \param nBytes is the number of bytes to read from the slave.
//!
//! This function reads one/multiple bytes of data from an I2C slave device.
//! The I2C_PORT parameter is the I2C modules master base address.
//! \e I2C_PORT parameter can be one of the following values:
//!
//!
//! \return 0 if there was an error or 1 if there was not.
//
//int32_t i2c_RcvBuf(uint8_t SlaveID, uint8_t addr, int32_t nBytes, uint8_t* pBuf);
//*****************************************************************************
int32_t i2c_RcvBuf(uint8_t SlaveID, uint8_t addr, int32_t nBytes , uint8_t* pBuf )
{
uint8_t nBytesCount; // local variable used for byte counting/state determination
uint16_t MasterOptionCommand; // used to assign the commands for ROM_I2CMasterControl() function
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(I2C_PORT))
{
};
//
// Tell the master module what address it will place on the bus when
// writing to the slave.
//
ROM_I2CMasterSlaveAddrSet(I2C_PORT, SlaveID, 0);
//
// Place the command to be sent in the data register.
//
ROM_I2CMasterDataPut(I2C_PORT, addr);
//
// Initiate send of data from the master.
//
ROM_I2CMasterControl(I2C_PORT, I2C_MASTER_CMD_SINGLE_SEND);
//
// Wait until master module is done transferring.
//
while(ROM_I2CMasterBusy(I2C_PORT))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(I2C_PORT) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Tell the master module what address it will place on the bus when
// reading from the slave.
//
ROM_I2CMasterSlaveAddrSet(I2C_PORT, SlaveID, true);
//
// Start with BURST with more than one byte to write
//
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_START;
for(nBytesCount = 0; nBytesCount < nBytes; nBytesCount++)
{
//
// The second and intermittent byte has to be read with CONTINUE control word
//
if(nBytesCount == 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_CONT;
//
// The last byte has to be send with FINISH control word
//
if(nBytesCount == nBytes - 1)
MasterOptionCommand = I2C_MASTER_CMD_BURST_RECEIVE_FINISH;
//
// Re-configure to SINGLE if there is only one byte to read
//
if(nBytes == 1)
MasterOptionCommand = I2C_MASTER_CMD_SINGLE_RECEIVE;
//
// Initiate read of data from the slave.
//
ROM_I2CMasterControl(I2C_PORT, MasterOptionCommand);
//
// Wait until master module is done reading.
//
while(ROM_I2CMasterBusy(I2C_PORT))
{
};
//
// Check for errors.
//
if(ROM_I2CMasterErr(I2C_PORT) != I2C_MASTER_ERR_NONE)
{
return 0;
}
//
// Move byte from register
//
pBuf[nBytesCount] = I2CMasterDataGet(I2C_PORT);
}
// send number of received bytes
return nBytesCount;
}
