Hi all! Could you please help me understand this piece of code here?
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WAN NOR NAZIRA MUSTAPA KAMAL
am 21 Jan. 2021
Kommentiert: WAN NOR NAZIRA MUSTAPA KAMAL
am 22 Jan. 2021
%% setup
hold all
a = arduino('COM3', 'Uno');
mpu = i2cdev(a,'0x68'); %mpu adress is normally 0x68
writeRegister(mpu, hex2dec('B6'), hex2dec('00'), 'int16'); %reset
data = zeros(10000,14,'int8'); %prelocating for the speed
j = 1;
a1 = animatedline('Color',[1 0 0]);
a2 = animatedline('Color',[0 1 0]);
a3 = animatedline('Color',[0 0 1]);
legend('Accel_x','Accel_y','Accel_z')
%% loop
while(true)
x=1;
for i=59:72 % 14 Data Registers for Accel,Temp,Gyro
data(j,x) = readRegister(mpu, i, 'int8');
x = x + 1;
end
y = swapbytes(typecast(data(j,:), 'int16')) %if your system is big-endian remove the swapbytes function
addpoints(a1,j,double(y(1)));
addpoints(a2,j,double(y(2)));
addpoints(a3,j,double(y(3)));
j = j+1;
drawnow limitrate
end
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Walter Roberson
am 21 Jan. 2021
It initializes an i2c register on the arduino. It loops indefinitely. Each cycle it reads 14 bytes of data that are in big-Endian order. It rearranges the data to be 16 bit little-Endian signed 16 bit integers. It takes the first three of those and adds them to the plot and ignores the rest.
After 10000 points it will slow down a lot for memory allocation reasons.
The code could be trimmed a bit, such as not reading the values it is not going to use.
7 Kommentare
Walter Roberson
am 22 Jan. 2021
You are control-c or clicking the Pause button in the editor? I am concerned that the arduino connection might still be open.
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