void I2C_ReadFromReg_Burst(uint8_t address, uint8_t deviceRegister, uint8_t* data, uint8_t burstNum)
{
// Assert the start condition
StartI2C1();
while (I2C1CONbits.SEN);
// Send the 7-bit device address
MasterWriteI2C1(address << 1);
while (I2C1STATbits.TBF); // 8 clock cycles
while (!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
// Send the register address
MasterWriteI2C1(deviceRegister);
while (I2C1STATbits.TBF); // 8 clock cycles
while (!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
// Start a new I2C transaction
RestartI2C1();
while (I2C1CONbits.RSEN);
// Send the second address
MasterWriteI2C1((address << 1) + 1);
while (I2C1STATbits.TBF); // 8 clock cycles
while (!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
// Read the data
data[0] = MasterReadI2C1();
if (burstNum > 1) {
uint8_t i;
for (i = 1; i < burstNum; i++) {
AckI2C1();
while (I2C1CONbits.ACKEN == 1);
data[i] = MasterReadI2C1();
}
}
// No need to ack reception of this data
NotAckI2C1();
while (I2C1CONbits.ACKEN == 1);
// Stop the I2C transaction
StopI2C1();
while (I2C1CONbits.PEN);
// Go idle on the bus
IdleI2C1();
}
int RcvData2(unsigned int address){
rcv = 0;
StartI2C1(); //Send line start condition
IdleI2C1(); //Wait to complete
MasterWriteI2C1((address << 1) | 1); //Write out slave address OR 1 (read command)
IdleI2C1(); //Wait to complete
rcv = MasterReadI2C1()<<8; //Read in a value
AckI2C1();
rcv |= MasterReadI2C1();
StopI2C1(); //Send line stop condition
IdleI2C1(); //Wait co complete
return rcv; //Return read value
}
uint8_t I2C_ReadFromReg(uint8_t I2CAddress, uint8_t deviceRegister) {
uint8_t data = 0;
StartI2C1();
while(I2CCONbits.SEN);
MasterWriteI2C1(I2CAddress << 1);
while(I2CSTATbits.TBF); // 8 clock cycles
while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
MasterWriteI2C1(deviceRegister);
while(I2CSTATbits.TBF); // 8 clock cycles
while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
RestartI2C1(); // Second start.
while(I2CCONbits.RSEN);
MasterWriteI2C1((I2CAddress << 1 )+ 1);
while(I2CSTATbits.TBF); // 8 clock cycles
while(!IFS1bits.MI2C1IF); // Wait for 9th clock cycle
IFS1bits.MI2C1IF = 0; // Clear interrupt flag
data = MasterReadI2C1();
NotAckI2C1(); // Read stop sequence.
while(I2C1CONbits.ACKEN == 1);
StopI2C1();
while(I2CCONbits.PEN);
IdleI2C1();
return(data);
}
/**
* @brief Write to device using generic i2c protocol
* @param[in] slave_addr - slave address
* @param[in] reg_addr - register address
* @param[in] length - number of bytes to read
* @param[in] *data - pointer to where register data is to be transfered
* @return 0 if sucessfull, 1 otherwise
*/
int i2c_read(unsigned char slave_addr, unsigned char reg_addr, unsigned char length, unsigned char *data) {
BYTE i=2;
StartI2C1(); //Send the Start Bit
IdleI2C1();
if (MasterWriteI2C1(((slave_addr<<1)|(0x00))))
return 1;
IdleI2C1();
if (MasterWriteI2C1(reg_addr))
return 1;
IdleI2C1();
StartI2C1(); //Send the Start Bit
IdleI2C1(); //Wait to complete
if (MasterWriteI2C1(((slave_addr<<1)|(0x01))))
return 1;
IdleI2C1();
I2CReceiverEnable ( I2C1, TRUE);
for(i=0;i<length;i++) {
data[i] = MasterReadI2C1();
if(i<(length-1)) {
I2CAcknowledgeByte(MPU_I2C, TRUE);
IdleI2C1();
}
else {
I2CAcknowledgeByte(MPU_I2C, FALSE);
IdleI2C1();
}
}
StopI2C1(); //Send the Stop condition
IdleI2C1(); //Wait to complete
return 0;
}
/*
* Function reads I2C device from slaveAdd
* inputs: slaveAdd
* registerAdd
* returns: int recByte -> received byte from slave device
* -1 -> reading error
*/
unsigned char I2C1ReadByte1(UINT8 slaveAdd, UINT8 registerAdd)
{
unsigned char recByte = 0;
UINT8 address;
StartI2C1();
IdleI2C1(); //Wait to complete
address = (slaveAdd<<1) & 0xFE; //write
MasterWriteI2C1(address);
IdleI2C1();
if(I2C1STATbits.ACKSTAT)
{
StopI2C1();
IdleI2C1();
return 0;
}
//Send register register location
MasterWriteI2C1(registerAdd);
IdleI2C1();
if(I2C1STATbits.ACKSTAT)
{
StopI2C1();
IdleI2C1();
return 0;
}
RestartI2C1(); //Send start condition again
IdleI2C1();
address = (slaveAdd<<1) | 0x01; //Read
MasterWriteI2C1(address);
IdleI2C1();
if(I2C1STATbits.ACKSTAT)
{
StopI2C1();
IdleI2C1();
return 0;
}
recByte = MasterReadI2C1();
//NotAckI2C1();
IdleI2C1();
StopI2C1();
IdleI2C1();
return recByte;
}
unsigned char portableMasterReadI2C(I2cBusConnection* i2cBusConnection) {
I2cBus* i2cBus = i2cBusConnection->i2cBus;
if (i2cBus == NULL) {
return MasterReadI2C1();
}
else {
unsigned portIndex = i2cBus->port;
if (portIndex == I2C_BUS_PORT_1) {
I2C1CONbits.RCEN = 1;
while (I2C1CONbits.RCEN);
I2C1STATbits.I2COV = 0;
return(I2C1RCV);
}
#if defined _I2C2
else if (portIndex == I2C_BUS_PORT_2) {
TODO : Throw Not Implemented
I2C2CONbits.RCEN = 1;
while (I2C2CONbits.RCEN);
I2C2STATbits.I2COV = 0;
return (I2C2RCV);
}
#endif
#if defined _I2C3
else if (portIndex == I2C_BUS_PORT_3) {
I2C3CONbits.RCEN = 1;
while(I2C3CONbits.RCEN);
I2C3STATbits.I2COV = 0;
return (I2C3RCV);
}
#endif
#if defined _I2C4
else if (portIndex == I2C_BUS_PORT_4) {
I2C4CONbits.RCEN = 1;
while(I2C4CONbits.RCEN);
I2C4STATbits.I2COV = 0;
return (I2C4RCV);
}
#endif
}
return 0;
}
unsigned char Read23X08_17(unsigned char reg, unsigned char gAddrPins)
{
unsigned char num;
StartI2C1();
// Wait till start sequence is completed
while (I2C1CONbits.SEN);
MasterWriteI2C1(gControlByte | WrtCmd | gAddrPins);
WaitForACK();
MasterWriteI2C1(reg);
WaitForACK();
RestartI2C1();
IdleI2C1();
MasterWriteI2C1(gControlByte | RdCmd | gAddrPins);
WaitForACK();
num = MasterReadI2C1();
NotAckI2C1();
StopI2C1();
IdleI2C1();
return (num);
}
unsigned char i2cReceiveByte(unsigned char channel) {
if (channel == 1) { return MasterReadI2C1(); }
else { return MasterReadI2C2(); }
}
