This is my (Almost) first post so here goes...
The following code extracts the Wii Nunchuck Accelerometer data, including the LSB for x,y,and z acceleration. All information was found at http://www.wiili.org/index.php/Wiimote/Extension_Controllers/Nunchuk
and using the accelerometer datasheet at http://www.st.com/stonline/products/literature/ds/11668.pdf I notated that values are +-2G. There is a small conversion at the bottom to scale the X,Y, and Z accelerometers to their true value. I'm having difficulty scaling +-2G so for now their values are 0-4. 0 Being -2G and 4 being +2G. Please Evaluate code, I'm new to programming and this is my first real program. Thanks!
The following code extracts the Wii Nunchuck Accelerometer data, including the LSB for x,y,and z acceleration. All information was found at http://www.wiili.org/index.php/Wiimote/Extension_Controllers/Nunchuk
and using the accelerometer datasheet at http://www.st.com/stonline/products/literature/ds/11668.pdf I notated that values are +-2G. There is a small conversion at the bottom to scale the X,Y, and Z accelerometers to their true value. I'm having difficulty scaling +-2G so for now their values are 0-4. 0 Being -2G and 4 being +2G. Please Evaluate code, I'm new to programming and this is my first real program. Thanks!
Code:
Symbol Analog_x = b8
Symbol Analog_y = b1
Symbol Accel_Xraw = W1
Symbol Accel_Yraw = w2
Symbol Accel_Zraw = w3
Symbol Accel_X =b9
Symbol Accel_Xdec =b10
Symbol Accel_Y =b11
Symbol Accel_Ydec =b12
Symbol Accel_Z =b13
Symbol Accel_Zdec =b14
Init:
hi2csetup i2cmaster, $A4, i2cslow, i2cbyte
hi2cout ($40,$00)
Pause 10
Retrieve:
hi2cout (0)
Pause 10
hi2cin (analog_x,analog_y,Accel_Xraw,Accel_Yraw,Accel_Zraw,b0)
b0 =b0^0x17 + 0x17 'decrypts button state
poke $58,Bit0 'Bit 0: "Z"-Button (0 = pressed, 1 = released)
Poke $59,Bit1 'Bit 1: "C" button (0 = pressed, 1 = released)
'Bits 2-3: X acceleration LSB
'Bits 4-5: Y acceleration LSB
'Bits 6-7: Z acceleration LSB
analog_x= analog_x^0x17 + 0x17 'Decrypts x-axis Value of analog stick
'Min(Full Left):0x1E
'Medium(Center):0x7E
'Max(Full Right):0xE1
analog_y=analog_y^0x17 + 0x17 'decrypts y-axis value of analog stick
'Min(Full Down):0x1D
'Medium(Center):0x7B
'Max(Full Right):0xDF
Accel_Xraw=Accel_Xraw^0x17 + 0x17 'decrypts x-axis acceleration value
Accel_Xraw=Accel_Xraw << 2 'Min(at -2G):0x48
b0=b0 >> 2 & 0x03 'Medium(at 0G):0x7D
Accel_Xraw=Accel_Xraw | b0 'Max(at 2G):0xB0
Accel_Yraw=Accel_Yraw^0x17 + 0x17 'decrypts y-axis acceleration value
Accel_Yraw=Accel_Yraw << 2 'Min(at -2G):0x46
b0=b0 >> 2 & 0x03 'Medium(at 0G):0x7A
Accel_Yraw=Accel_Yraw | b0 'Max(at 2G):0xAF
Accel_Zraw=Accel_Zraw^0x17 + 0x17 'decrypts z-axis acceleration value
Accel_Zraw=Accel_Zraw << 2 'Min(at -2G):0x4A
b0=b0 >> 2 & 0x03 'Medium(at 0G):0x7E
Accel_Zraw=Accel_Zraw | b0 'Max(at 2G):0xB1
debug
goto convert
Convert:
accel_xraw=accel_xraw*40 / 1024
accel_x = Accel_xraw dig 1
accel_xdec = Accel_xraw dig 0
accel_yraw=accel_yraw*40 / 1024
accel_y = Accel_yraw dig 1
accel_ydec = Accel_yraw dig 0
accel_zraw=accel_zraw*40 / 1024
accel_z = Accel_zraw dig 1
accel_zdec = Accel_zraw dig 0
Goto retrieve
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