void SaySomething(const char* pMessage, uint8_t pWaitTillEnd){
//Just in my version, the /enable of the opamp is on D0
//force it on
//PORTD &= 0xFE;
USI_TWI_Master_Initialise();
uint8_t vLen = strlen(pMessage);
//heading byte : address + is it read or write
mBuff[0] = (AQTK_I2C_ADDR<<TWI_ADR_BITS) | (FALSE<<TWI_READ_BIT);
strncpy(mBuff +1, pMessage, vLen);
mBuff[1+vLen] = 0;
mBuff[1+vLen+1] = 13;//need the CR char
mBuff[1+vLen+1+1] = 0;
//send 4 bytes
USI_TWI_Start_Read_Write( (unsigned char*) mBuff, vLen+4 );
//wait until the LSI is free
if (pWaitTillEnd){
while (LsiIsBusy() == 1){_delay_ms(50);}
}
//Just in my version, the /enable of the opamp is on D0
//force it OFF
//PORTD |= 0x01;
}
int main(void) {
// initialize
uint8_t i2cMessageBuf[I2C_MAX_MSG_SIZE];
USI_TWI_Master_Initialise();
// reset the power mgmt register to wake it up
i2cMessageBuf[0] = (uint8_t) 0xD0; // address 0x68, write
i2cMessageBuf[1] = 0x6b; // low x-axis
i2cMessageBuf[2] = 0x00;
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x03);
long_delay_ms(50);
while (TRUE) {
// construct a command to high-order x value of a 9150 accelerometer
// register 59 = 0x3b; low-order register is 0x3c, then put them
// together
i2cMessageBuf[0] = (uint8_t) 0xD0;
i2cMessageBuf[1] = 0x3b; // high x-axis
//i2cMessageBuf[2] = 0x3c;
// send the message
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x02);
// wait
long_delay_ms(50);
// read the msg
i2cMessageBuf[0] = 0xD1; // lsb == 1 => read
i2cMessageBuf[1] = 0x3b;
//i2cMessageBuf[2] = 0x3c;
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x03);
//USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x04);
// turn on LED if not flat on table
// flat on table: high is FA, low is FF
if (i2cMessageBuf[1] != 0xFA) {
DDRB |= 1 << PB3;
PORTB &= ~(1<<PB3);
}
else PORTB |= 1 << PB3;
// wait
long_delay_ms(500);
}
// never reached
return 0;
}
uint8_t USI_TWI::endTransmission(){ // actually sends the buffer
bool xferOK = false;
uint8_t errorCode = 0;
xferOK = USI_TWI_Start_Read_Write(USI_Buf,USI_BufIdx+1); // core func that does the work
USI_BufIdx = 0;
if (xferOK) return 0;
else { // there was an error
errorCode = USI_TWI_Get_State_Info(); // this function returns the error number
return errorCode;
}
}
uint8_t USI_TWI::requestFrom(uint8_t slaveAddr, uint8_t numBytes){ // setup for receiving from slave
bool xferOK = false;
uint8_t errorCode = 0;
USI_LastRead = 0;
USI_BytesAvail = numBytes; // save this off in a global
numBytes++; // add extra byte to transmit header
USI_Buf[0] = (slaveAddr<<TWI_ADR_BITS) | USI_RCVE; // setup address & Rcve bit
xferOK = USI_TWI_Start_Read_Write(USI_Buf,numBytes); // core func that does the work
// USI_Buf now holds the data read
if (xferOK) return 0;
else { // there was an error
errorCode = USI_TWI_Get_State_Info(); // this function returns the error number
return errorCode;
}
}
//Returns 1 if busy
//basically recomposed on IsBusy from the AquesTalk's Arduino library
uint8_t LsiIsBusy(){
//heading byte : address + is it read or write
mBuff[0] = (AQTK_I2C_ADDR<<TWI_ADR_BITS) | (TRUE<<TWI_READ_BIT);
mBuff[1] = 0;
USI_TWI_Start_Read_Write( mBuff, 2 );
//answer is in mBuff[1] !
if (mBuff[1]=='*' || mBuff[1]==0xFF){
//busy, come back later
_delay_ms(10);
return 1;
}
return 0;
}
void AquestLSI_Init(){
USI_TWI_Master_Initialise();
//heading byte : address + is it read or write
mBuff[0] = (AQTK_I2C_ADDR<<TWI_ADR_BITS) | (FALSE<<TWI_READ_BIT);
//from the next byte is the message
mBuff[1] = '?';
mBuff[2] = 0;
mBuff[3] = 13; //need the CR char
mBuff[4] = 0;
//send 4 bytes
USI_TWI_Start_Read_Write( mBuff, 5 );
//Just in my version, the /enable of the opamp is on D0
//force it OFF
//PORTD |= 0x01;
}
uint8_t i2c_endTransmission(uint8_t stop) { // actually sends the buffer
bool xferOK = false;
uint8_t errorCode = 0;
xferOK = USI_TWI_Start_Read_Write(USI_Buf,USI_BufIdx+1); // core func that does the work
USI_BufIdx = 0;
if (xferOK) {
if (stop) {
errorCode = USI_TWI_Master_Stop();
if (errorCode == 0) {
errorCode = USI_TWI_Get_State_Info();
return errorCode;
}
}
return 0;
} else { // there was an error
errorCode = USI_TWI_Get_State_Info(); // this function returns the error number
return errorCode;
}
}
