bool I2C1dev_writeBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t* data) {
// S
IdleI2C1();
StartI2C1();
// Device write address
IdleI2C1();
WriteI2C1(devAddr << 1 | 0x00);
// Register address
IdleI2C1();
WriteI2C1(regAddr);
for (i_accel = 0; i_accel < length; i_accel++) {
// Data byte
IdleI2C1();
WriteI2C1(data[i_accel]);
}
// P
IdleI2C1();
StopI2C1();
return 1;
}
/*
* send data to a slave device
* takes the slave address, writes the given data byte
*/
int sendSpeed(unsigned int *slaveAddr, unsigned int *speed) {
// get the data from global variable
char newSpeed[3] = {*speed, 'X', '\0'};
// wait until idle - not actually needed for single-master bus
IdleI2C1();
StartI2C1(); // send start
data = SSP1BUF;
WriteI2C1(*slaveAddr & 0xFE);
// do { // send address until ack'd
// status = WriteI2C1(*slaveAddr || 0x00);
// if (!(0 == status)) { // write collision
// data = SSP1BUF;
// SSP1CON1bits.WCOL = 0;
// }
// } while (!(0 == status));
// send bytes
WriteI2C1(newSpeed[0]); // TODO: send multiple bytes
StopI2C1(); // stop transmission
return 1;
}
uint8_t
mti_tcn75a_set_resolution(MtiTcn75aResolution resolution)
{
uint8_t tmp;
uint8_t rc;
/* start */
StartI2C1();
/* send slave address (write) */
rc = WriteI2C1(0b10010000);
if (rc != 0x00) {
rc = CH_ERROR_I2C_SLAVE_ADDRESS;
goto out;
}
/* set config pointer */
rc = WriteI2C1(0b00000001);
if (rc != 0x00) {
rc = CH_ERROR_I2C_SLAVE_CONFIG;
goto out;
}
/* send config */
tmp = 0x00;
tmp |= resolution << 5;
WriteI2C1(tmp);
/* stop */
StopI2C1();
out:
return rc;
}
/*
* sends a start and writes a char
*/
int startAndWrite(char *c) {
char data = 0x9A; //0b10011010;
IdleI2C1();
StartI2C1();
WriteI2C1(*c); // just write a char
WriteI2C1(data);
StopI2C1();
}
void main(void) {
unsigned char slave7bitAddr = 0x2A; //7-bit address of Slave. MSB=Don't care.
unsigned char slaveAddrWrite = (slave7bitAddr << 1); //LSB=0, Master Write request.
signed char writeStat;
unsigned char message[11] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'};
OSCCONbits.IRCF = 0b111; //Set internal oscillator to 16mHz
//Must set SCL(pin RC3)and SDA(pin RC4) as inputs and enable digital buffers.
TRISCbits.TRISC3 = 1; //set input
TRISCbits.TRISC4 = 1;
ANSELCbits.ANSC3 = 0; //enable digital buffer
ANSELCbits.ANSC4 = 0;
OpenI2C1(MASTER, SLEW_OFF); //If you switch to 400kHz (see below) set SLEW_ON
/* You can ignore all I2C "unable to resolve identifier" errors assuming
you didn't make any typos. Don't forget the "1"'s. */
/* Now set the I2C clock speed. I2C Master always controls clock.
For 400kHz use 1k pullup resistors and for 100kHz use 2.2k ohms */
SSP1ADD = 0x27; //100Khz = FOSC/(4 * (SSPADD + 1)) = 16E6/((39 + 1) * 4)note:39=0x27
//SSP1ADD = 0x09; //400Khz = FOSC/(4 * (SSPADD + 1)) = 16E6/((9 + 1) * 4)
while (1) {
IdleI2C1(); //Wait for bus to become idle.
StartI2C1(); //Begin I2C communication
IdleI2C1();
//send slave address (w/write request bit) and wait for slave to reply.
do {
writeStat = WriteI2C1(slaveAddrWrite); //Send address with LSB=Write
if (writeStat == -1) { //Detected bus collision - More than one master?
unsigned char data = SSP1BUF; //clear the buffer by reading it.
SSPCON1bits.WCOL = 0; //clear the bus collision status bit
} else if (writeStat == -2) { //NACK (no acknowledge rx'd)
//Is the slave on and ready? Did we send the correct address?
}
} while (writeStat != 0); //Keep repeating until slave acknowledges.
//Slave has Ack'd so we can send our Hello World message now.
for (int x = 0; x <= 10; x++) {
do {
writeStat = (WriteI2C1(message[x]));
if (writeStat == -2) { //NACK (no acknowledge rx'd)
//Is the slave on and ready? Using the correct pullups?
}
} while (writeStat != 0); //Keep repeating until slave acknowledges.
}
IdleI2C1();
StopI2C1();
//Delay about 1 sec and then repeat. 1sec = ((10K*200*2)/(16E6/4)
Delay10KTCYx(200);
Delay10KTCYx(200);
}
}
void I2CWriteByte(unsigned char add,unsigned char subadd,unsigned char data)
{
StartI2C1();
WriteI2C1(add<<1);
//while(!SSP1CON2bits.ACKSTAT);
WriteI2C1(subadd);
//while(!SSP1CON2bits.ACKSTAT);
WriteI2C1(data);
//while(!SSP1CON2bits.ACKSTAT);
StopI2C1();
}
unsigned char I2CReadByte(unsigned char add,unsigned char subadd)
{
unsigned char _temp=0;
StartI2C1();
while(WriteI2C1(add<<1)!=0);
while(WriteI2C1(subadd)!=0);
RestartI2C1();
while(WriteI2C1(1+(add<<1))!=0);
_temp=ReadI2C1();
NotAckI2C1();
StopI2C1();
return _temp;
}
int8_t I2C1dev_readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data) {
count_accel = 0;
// S
IdleI2C1();
StartI2C1();
// Device write address
IdleI2C1();
WriteI2C1(devAddr << 1 | 0x00);
// Register address
IdleI2C1();
WriteI2C1(regAddr);
// R
IdleI2C1();
RestartI2C1();
// Device read address
IdleI2C1();
WriteI2C1(devAddr << 1 | 0x01);
for (count_accel = 0; count_accel < length; count_accel++) {
// Data byte
IdleI2C1();
data[count_accel] = ReadI2C1();
if (count_accel == length - 1) {
// NACK
IdleI2C1();
NotAckI2C1();
} else {
// ACK
IdleI2C1();
AckI2C1();
}
}
// P
IdleI2C1();
StopI2C1();
return count_accel;
}
uint8_t
mti_tcn75a_get_temperature(int32_t *result)
{
uint16_t tmp;
uint8_t rc;
uint8_t tmp_lsb = 4;
uint8_t tmp_msb = 2;
/* start */
StartI2C1();
/* send slave address (write) */
rc = WriteI2C1(0b10010000);
if (rc != 0x00) {
rc = CH_ERROR_I2C_SLAVE_ADDRESS;
goto out;
}
/* set ambient temperature pointer */
rc = WriteI2C1(0b00000000);
/* reset the bus */
RestartI2C1();
/* send slave address (read) */
WriteI2C1(0b10010001);
/* read the temperature */
tmp_msb = ReadI2C1();
AckI2C1();
tmp_lsb = ReadI2C1();
NotAckI2C1();
/* stop */
StopI2C1();
/* format result */
*result = (((int32_t) tmp_msb) << 16) + (((int32_t) tmp_lsb) << 8);
out:
return rc;
}
/*
* Simple test case, just try to write a char
*/
int writeChar(char *c) {
IdleI2C1();
WriteI2C1(*c); // just write a char
}
signed int EERandomRead1( unsigned char control, unsigned char address )
{
IdleI2C1(); // ensure module is idle
StartI2C1(); // initiate START condition
while ( SSP1CON2bits.SEN ); // wait until start condition is over
if ( PIR2bits.BCL1IF ) // test for bus collision
{
return ( -1 ); // return with Bus Collision error
}
else
{
if ( WriteI2C1( control ) ) // write 1 byte
{
StopI2C1();
return ( -3 ); // return with write collision error
}
//IdleI2C1(); // ensure module is idle
if ( !SSP1CON2bits.ACKSTAT ) // test for ACK condition, if received
{
if ( WriteI2C1( address ) ) // WRITE word address for EEPROM
{
StopI2C1();
return ( -3 ); // return with write collision error
}
//IdleI2C1(); // ensure module is idle
if ( !SSP1CON2bits.ACKSTAT ) // test for ACK condition, if received
{
RestartI2C1(); // generate I2C1 bus restart condition
while ( SSP1CON2bits.RSEN );// wait until re-start condition is over
if ( PIR2bits.BCL1IF ) // test for bus collision
{
return ( -1 ); // return with Bus Collision error
}
if ( WriteI2C1( control+1 ))// write 1 byte - R/W bit should be 1
{
StopI2C1();
return ( -3 ); // return with write collision error
}
//IdleI2C1(); // ensure module is idle
if ( !SSP1CON2bits.ACKSTAT )// test for ACK condition, if received
{
SSP1CON2bits.RCEN = 1; // enable master for 1 byte reception
while ( SSP1CON2bits.RCEN ); // check that receive sequence is over
NotAckI2C1(); // send ACK condition
while ( SSP1CON2bits.ACKEN ); // wait until ACK sequence is over
StopI2C1(); // send STOP condition
while ( SSP1CON2bits.PEN ); // wait until stop condition is over
if ( PIR2bits.BCL1IF ) // test for bus collision
{
return ( -1 ); // return with Bus Collision error
}
}
else
{
StopI2C1();
return ( -2 ); // return with Not Ack error
}
}
else
{
StopI2C1();
return ( -2 ); // return with Not Ack error
}
}
else
{
StopI2C1();
return ( -2 ); // return with Not Ack error
}
}
return ( (unsigned int) SSP1BUF ); // return with data
}
int LCDClearData(BYTE add1)
{
#ifdef _WINDOWS
UNUSED(add1);
#else
BYTE i;
BYTE j;
BYTE data;
BYTE status;
for(j=0;j<7;j++){
LCDSetXY(add1,0,j);
RestartI2C();
IdleI2C();
//****write the address of the device for communication***
data = SSPBUF; //read any previous stored content in buffer to clear buffer full status
do
{
status = WriteI2C( add1 | 0x00 ); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//R/W BIT IS '0' FOR FURTHER WRITE TO SLAVE
do
{
status = WriteI2C(modeLCD_DATA_TILL_STOP); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//***WRITE THE THE DATA TO BE SENT FOR SLAVE***
//write string of data to be transmitted to slave
for (i=0;i<128;i++ ) // transmit data
{
if ( SSP1CON1bits.SSPM3 ) // if Master transmitter then execute the following
{
//temp = putcI2C1 ( *wrptr );
//if (temp ) return ( temp );
if ( WriteI2C1( 0 ) ) // write 1 byte
{
return ( -3 ); // return with write collision error
}
IdleI2C1(); // test for idle condition
if ( SSP1CON2bits.ACKSTAT ) // test received ack bit state
{
return ( -2 ); // bus device responded with NOT ACK
} // terminate putsI2C1() function
}
}
//---TERMINATE COMMUNICATION FROM MASTER SIDE---
IdleI2C();
}
#endif
return 0;
}
int LCDSendCommand(BYTE add1,BYTE* wrptr, BYTE size)
{
#ifdef _WINDOWS
UNUSED(add1);
UNUSED(wrptr);
UNUSED(size);
#else
BYTE i;
BYTE data;
BYTE status;
//****write the address of the device for communication***
if(START){
RestartI2C();
}
else {
StartI2C();
START=1;
}
IdleI2C();
data = SSPBUF; //read any previous stored content in buffer to clear buffer full status
do
{
status = WriteI2C( add1 | 0x00 ); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//R/W BIT IS '0' FOR FURTHER WRITE TO SLAVE
do
{
status = WriteI2C(modeLCD_CMD_TILL_STOP); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//***WRITE THE THE DATA TO BE SENT FOR SLAVE***
//write string of data to be transmitted to slave
for (i=0;i<size;i++ ) // transmit data
{
if ( SSP1CON1bits.SSPM3 ) // if Master transmitter then execute the following
{
//temp = putcI2C1 ( *wrptr );
//if (temp ) return ( temp );
if ( WriteI2C1( *wrptr ) ) // write 1 byte
{
return ( -3 ); // return with write collision error
}
IdleI2C1(); // test for idle condition
if ( SSP1CON2bits.ACKSTAT ) // test received ack bit state
{
return ( -2 ); // bus device responded with NOT ACK
} // terminate putsI2C1() function
}
wrptr ++; // increment pointer
}
IdleI2C();
#endif
return 0;
}
int LCDSendData(BYTE add1,BYTE* wrptr, BYTE size)
{
#ifndef _WINDOWS
BYTE data;
BYTE status;
BYTE i;
BYTE_VAL d;
BYTE_VAL d1;
RestartI2C();
IdleI2C();
//****write the address of the device for communication***
data = SSPBUF; //read any previous stored content in buffer to clear buffer full status
do
{
status = WriteI2C( add1 | 0x00 ); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//R/W BIT IS '0' FOR FURTHER WRITE TO SLAVE
do
{
status = WriteI2C(modeLCD_DATA_TILL_STOP); //write the address of slave
if(status == -1) //check if bus collision happened
{
data = SSPBUF; //upon bus collision detection clear the buffer,
SSPCON1bits.WCOL=0; // clear the bus collision status bit
//LATAbits.LATA1 =1;
}
}
while(status!=0); //write untill successful communication
//***WRITE THE THE DATA TO BE SENT FOR SLAVE***
//write string of data to be transmitted to slave
for (i=0;i<size;i++ ) // transmit data
{
if ( SSP1CON1bits.SSPM3 ) // if Master transmitter then execute the following
{
//temp = putcI2C1 ( *wrptr );
//if (temp ) return ( temp );
d.Val = *wrptr;
// swapping bits
d1.bits.b0 = d.bits.b7;
d1.bits.b1 = d.bits.b6;
d1.bits.b2 = d.bits.b5;
d1.bits.b3 = d.bits.b4;
d1.bits.b4 = d.bits.b3;
d1.bits.b5 = d.bits.b2;
d1.bits.b6 = d.bits.b1;
d1.bits.b7 = d.bits.b0;
//
if ( WriteI2C1( d1.Val ) ) // write 1 byte
{
return ( -3 ); // return with write collision error
}
IdleI2C1(); // test for idle condition
if ( SSP1CON2bits.ACKSTAT ) // test received ack bit state
{
return ( -2 ); // bus device responded with NOT ACK
} // terminate putsI2C1() function
}
wrptr ++; // increment pointer
}
//---TERMINATE COMMUNICATION FROM MASTER SIDE---
IdleI2C();
#else
UNUSED(add1);
UNUSED(wrptr);
UNUSED(size);
#endif
return 0;
}
