Tool/software: TI-RTOS
Hi.
I'm trying to read 16 Bytes from an I2C sensor with a for Loop with no success, but if I read byte per byte it seems to work (I haven't got to the part of integrating the SCS to my Project Zero).
The I2C communication is ok, I already did a read to a register with a known value during the initialization.
But on the execution, I need to read 16 bytes, then I created a for loop but it returns a value for index 0, and always 255 for the other 15 indexes.
This efficient way is not working
macro readQuat(){
i2cStart();
i2cTx(EM7180_ADDRESS | I2C_OP_WRITE); //W
i2cTx(0x00); // 0x00 is the first position
if (state.i2cStatus == 0x0000) {
i2cRepeatedStart();
i2cTx(EM7180_ADDRESS | I2C_OP_READ);
for (U16 n = 0; n < QUAT_SIZE; n++) {
i2cRxAck(output.EM7180quaternion[n]);
}
}
i2cStop();
}
This NON-optimal way seems to be working
macro readByte(reg,result){
i2cStart();
i2cTx(EM7180_ADDRESS | I2C_OP_WRITE); //W
i2cTx(reg); //Reg = Rom version
if (state.i2cStatus == 0x0000) {
i2cRepeatedStart();
i2cTx(EM7180_ADDRESS | I2C_OP_READ);
i2cRxAck(result);
}
i2cStop();
}
// Main
readByte(0x35,output.EM7180eventStatus); // reading clears the register
if(output.EM7180eventStatus & 0x04) { // new quaternion data available
//readQuat();
for (U16 n = 0; n < QUAT_SIZE; n++) {
readByte(n,output.EM7180quaternion[n]);
}
}
The problem is that the second way I'm sending a stop between each byte and it's time-consuming, is not optimal.
Any idea of the reason for this behavior? And how to fix it?
Thanks and my best regards.
