supleed2/ELEC60013-ES-CW1
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Basic reading almost complete

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This commit is contained in:
Kacper 2022-02-27 01:13:05 +00:00
parent eae0e52cdd
commit 898cd451db
2 changed files with 36 additions and 18 deletions
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50
lis3dh.py
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@ -44,26 +44,41 @@ INT1_CFG_V = bytes([0x95])
EMPTY = bytes([0x00]) EMPTY = bytes([0x00])
class lis3dh: class lis3dh:
def __init__(self, i2cBus, i2cAddress=0x18, samplerate=SAMPLERATE_1HZ): def __init__(self, i2cBus, resolution=2, samplerate=10, i2cAddress=0x18):
sleep(0.005) sleep(0.005)
self.i2c = i2cBus self.i2c = i2cBus
self.addr = i2cAddress self.addr = i2cAddress
self.samplerate = samplerate self.samplerate = samplerate
i2cBus.pec = True # enable smbus2 Packet Error Checking i2cBus.pec = True # enable smbus2 Packet Error Checking
res_modes = {
2: 0b00, 4: 0b01,
8: 0b10, 16: 0b11
}
sample_modes = {
0:0x0, 1:0x1, 10:0x2, 25:0x3, 50:0x4,
100:0x5, 200:0x6, 400:0x7
}
#First try; configure beginning from 0x20 with MSB = 1 to increment # Check if user-entered values are correct
config0 = smbus2.i2c_msg.write(self.addr, [0x20,0x1F]) if resolution in res_modes:
config1 = smbus2.i2c_msg.write(self.addr, [0xC1,0x00,0x00,0x00,0x00,0x00,0x00]) self.resolution = resolution
config2 = smbus2.i2c_msg.write(self.addr, [0xB2,0x00,0x00]) #Configure 0x32 with MSB = 1 to increment else:
config3 = smbus2.i2c_msg.write(self.addr, [0x30,0x00]) #Configure 0x30 raise Exception("Invalid resolution.")
config4 = smbus2.i2c_msg.write(self.addr, [0x24,0x00]) #Configure 0x24 again if samplerate in sample_modes:
self.samplerate = sample_modes[samplerate]
else:
raise Exception("Invalid sample rate.")
# First try; configure beginning from 0x20
config0 = smbus2.i2c_msg.write(self.addr, [0x20,(sample_modes[samplerate]<<4)|0xF]) # Initialise in low power mode
config1 = smbus2.i2c_msg.write(self.addr, [0xC1,0x00,0x00,0x00|self.resolution,0x00,0x00,0x00])
config2 = smbus2.i2c_msg.write(self.addr, [0xB2,0x00,0x00]) # Configure 0x32 with MSB = 1 to increment
config3 = smbus2.i2c_msg.write(self.addr, [0x30,0x00]) # Configure 0x30
config4 = smbus2.i2c_msg.write(self.addr, [0x24,0x00]) # Configure 0x24 again
self.i2c.i2c_rdwr(config0, config1, config2, config3, config4) self.i2c.i2c_rdwr(config0, config1, config2, config3, config4)
check_CTRL_REG1 = smbus2.i2c_msg.write(self.addr, [0x20])
ctrl_reg1 = smbus2.i2c_msg.read(self.addr, 1)
self.i2c.i2c_rdwr(check_CTRL_REG1, ctrl_reg1)
print(ctrl_reg1.buf[0])
def readAll(self) -> list: def readAll(self) -> list:
'''Read acceleration data from all axes. Returns values as a list [X,Y,Z].'''
check_status = smbus2.i2c_msg.write(self.addr, [0x27]) check_status = smbus2.i2c_msg.write(self.addr, [0x27])
x = smbus2.i2c_msg.read(self.addr, 1) x = smbus2.i2c_msg.read(self.addr, 1)
y = smbus2.i2c_msg.read(self.addr, 1) y = smbus2.i2c_msg.read(self.addr, 1)
@ -73,16 +88,19 @@ class lis3dh:
prepare_z = smbus2.i2c_msg.write(self.addr, [0x2D]) prepare_z = smbus2.i2c_msg.write(self.addr, [0x2D])
status = smbus2.i2c_msg.read(self.addr, 1) status = smbus2.i2c_msg.read(self.addr, 1)
self.i2c.i2c_rdwr(check_status, status) self.i2c.i2c_rdwr(check_status, status)
while (int.from_bytes(status.buf[0],"big") & 0b1111) != 0b1111:
#print(status.buf[0], "\n") while status.buf[0][0] & 0b1111 != 0b1111: # Wait for data to be available
sleep(0.01) sleep(0.001)
self.i2c.i2c_rdwr(check_status, status) self.i2c.i2c_rdwr(check_status, status)
if (int.from_bytes(status.buf[0],"big") & 0b1111) == 0b1111:
#print("Status: ",status.buf[0], "\n") if status.buf[0][0] & 0b1111 == 0b1111: # If data is available, read
self.i2c.i2c_rdwr(prepare_x, x) self.i2c.i2c_rdwr(prepare_x, x)
self.i2c.i2c_rdwr(prepare_y, y) self.i2c.i2c_rdwr(prepare_y, y)
self.i2c.i2c_rdwr(prepare_z, z) self.i2c.i2c_rdwr(prepare_z, z)
X = int.from_bytes(x.buf[0],"big") X = int.from_bytes(x.buf[0],"big")
Y = int.from_bytes(y.buf[0],"big") Y = int.from_bytes(y.buf[0],"big")
Z = int.from_bytes(z.buf[0],"big") Z = int.from_bytes(z.buf[0],"big")
# TODO: Need to format this so that it returns values in g
return [X,Y,Z] return [X,Y,Z]
else:
return None # Should never get here lol

2
main.py
View file

@ -2,7 +2,7 @@ from lis3dh import *
print("Raspberry Pi Zero W, up and running!") print("Raspberry Pi Zero W, up and running!")
bus = smbus2.SMBus(1) bus = smbus2.SMBus(1)
accel = lis3dh(bus) accel = lis3dh(bus,10)
print("LIS3DH initiated successfully!") print("LIS3DH initiated successfully!")