/Modules/H_Bridge/HBSTEP01B/SW/DIRECT_SPI_HBSTEP_test.py
40,16 → 40,21
DISTANCE = 50
 
class axis:
def __init__(self, SPI_handler, Direction, StepsPerUnit):
def __init__(self, SPI_handler, Direction, StepsPerUnit, MaxSpeed):
' One axis of robot '
self.spi = SPI_handler
self.Dir = Direction
self.SPU = StepsPerUnit
self.maxseed = MaxSpeed
self.Reset()
self.Initialize()
 
def Reset(self):
' Reset Axis and set default parameters for H-bridge '
'Reset the Axis'
self.spi.xfer([0xC0]) # reset
 
def Initialize(self):
'set default parameters for H-bridge '
# self.spi.xfer( 0x14) # Stall Treshold setup
# self.spi.xfer( 0xFF)
# self.spi.xfer( 0x13) # Over Current Treshold setup
64,26 → 69,33
self.spi.xfer([0x00])
self.spi.xfer([0x10])
self.spi.xfer([0x0A]) # KVAL_RUN
self.spi.xfer([0xFF])
self.spi.xfer([0x50])
self.spi.xfer([0x0B]) # KVAL_ACC
self.spi.xfer([0xFF])
self.spi.xfer([0x50])
self.spi.xfer([0x0C]) # KVAL_DEC
self.spi.xfer([0xFF])
self.spi.xfer([0x18]) # CONFIG
self.spi.xfer([0b00111000])
self.spi.xfer([0b00000000])
self.spi.xfer([0x05])
# self.spi.xfer([0x18]) # CONFIG
# self.spi.xfer([0b00111000])
# self.spi.xfer([0b00000000])
def MaxSpeed(self, speed):
' Setup of maximum speed '
self.spi.xfer([0x07]) # Max Speed setup
self.spi.xfer([0x00])
self.spi.xfer([speed])
'Setup of maximum speed in steps/s'
speed_value = int(speed / 15.25)
if (speed_value == 0):
speed_value = 1
print hex(speed_value)
 
data = [(speed_value >> i & 0xff) for i in (16,8,0)]
self.spi.xfer([data[0]]) # Max Speed setup
self.spi.xfer([data[1]])
self.spi.xfer([data[2]])
return (speed_value * 15.25)
 
def ReleaseSW(self):
' Go away from Limit Switch '
while self.ReadStatusBit(2) == 1: # is Limit Switch ON ?
self.spi.xfer([0x92 | (~self.Dir & 1)]) # release SW
while self.IsBusy():
while self.GetStatus()['BUSY']:
pass
self.MoveWait(10) # move 10 units away
90,15 → 102,37
def GoZero(self, speed):
' Go to Zero position '
self.ReleaseSW()
 
self.spi.xfer([0x82 | (self.Dir & 1)]) # Go to Zero
self.spi.xfer([0x00])
self.spi.xfer([speed])
while self.IsBusy():
while self.GetStatus()['BUSY']:
pass
time.sleep(0.3)
self.ReleaseSW()
 
def GetStatus(self):
#self.spi.xfer([0b11010000]) # Get status command from datasheet - does not work for uknown rasons
self.spi.xfer([0x39]) # Gotparam command on status register
data = self.spi.readbytes(1)
data = data + self.spi.readbytes(1)
 
status = dict([('SCK_MOD',data[0] & 0x80 == 0x80), #The SCK_MOD bit is an active high flag indicating that the device is working in Step-clock mode. In this case the step-clock signal should be provided through the STCK input pin. The DIR bit indicates the current motor direction
('STEP_LOSS_B',data[0] & 0x40 == 0x40),
('STEP_LOSS_A',data[0] & 0x20 == 0x20),
('OCD',data[0] & 0x10 == 0x10),
('TH_SD',data[0] & 0x08 == 0x08),
('TH_WRN',data[0] & 0x04 == 0x04),
('UVLO',data[0] & 0x02 == 0x02),
('WRONG_CMD',data[0] & 0x01 == 0x01), #The NOTPERF_CMD and WRONG_CMD flags are active high and indicate, respectively, that the command received by SPI cannot be performed or does not exist at all.
('NOTPERF_CMD',data[1] & 0x80 == 0x80),
('MOT_STATUS',data[1] & 0x60),
('DIR',data[1] & 0x10 == 0x10),
('SW_EVN',data[1] & 0x08 == 0x08),
('SW_F',data[1] & 0x04 == 0x04), #The SW_F flag reports the SW input status (low for open and high for closed).
('BUSY',data[1] & 0x02 != 0x02),
('HIZ',data[1] & 0x01 == 0x01)])
return status
 
def Move(self, units):
' Move some distance units from current position '
steps = units * self.SPU # translate units to steps
111,43 → 145,38
self.spi.xfer([(steps >> 8) & 0xFF])
self.spi.xfer([steps & 0xFF])
 
def Run(self, direction, speed):
speed_value = int(speed / 0.015)
print hex(speed_value)
 
data = [0b01010000 + direction]
data = data +[(speed_value >> i & 0xff) for i in (16,8,0)]
self.spi.xfer([data[0]]) # Max Speed setup
self.spi.xfer([data[1]])
self.spi.xfer([data[2]])
self.spi.xfer([data[3]])
return (speed_value * 0.015)
 
def MoveWait(self, units):
' Move some distance units from current position and wait for execution '
self.Move(units)
while self.IsBusy():
while self.GetStatus()['BUSY']:
pass
time.sleep(0.8)
 
def Float(self):
def Float(self, hard = False):
' switch H-bridge to High impedance state '
if (hard == False):
self.spi.xfer([0xA0])
 
def ReadStatusBit(self, bit):
' Report given status bit '
self.spi.xfer([0x39]) # Get status command
data = self.spi.readbytes(1) # 1st byte
data = data + (self.spi.readbytes(1)) # 1st byte
print data
if bit > 7: # extract requested bit
OutputBit = (data[0] >> (bit - 8)) & 1
else:
OutputBit = (data[1] >> bit) & 1
return OutputBit
self.spi.xfer([0xA8])
 
 
def IsBusy(self):
""" Return True if tehre are motion """
if self.ReadStatusBit(1) == 1:
return False
else:
return True
 
# End Class axis --------------------------------------------------
 
print "Stepper motor control test started. \r\n"
print "Max motor speed: %d " % SPEED
print "Distance to run: %d " % DISTANCE
print "Max motor speed: %f " % SPEED
print "Distance to run: %f " % DISTANCE
 
try:
print "SPI configuration.."
157,15 → 186,19
spi.lsbfirst = False
spi.bits_per_word = 8
spi.cshigh = False
spi.max_speed_hz = 100000
#spi.SPI_config(spi.I2CSPI_MSB_FIRST| spi.I2CSPI_MODE_CLK_IDLE_HIGH_DATA_EDGE_TRAILING| spi.I2CSPI_CLK_461kHz)
time.sleep(1)
 
print "Axis inicialization"
X = axis(spi, 0, 641) # set Number of Steps per axis Unit and set Direction of Rotation
X.MaxSpeed(SPEED) # set maximal motor speed
X = axis(spi, 0, 641, MaxSpeed = SPEED) # set Number of Steps per axis Unit and set Direction of Rotation
 
print X.MaxSpeed(SPEED) # set maximal motor speed
 
print X.Run(1, 200.456431)
time.sleep(10)
'''
print "Axis is running"
 
for i in range(5):
print i
X.MoveWait(DISTANCE) # move forward and wait for motor stop
174,8 → 207,8
X.MoveWait(-DISTANCE) # move backward and wait for motor stop
print "Changing direction of rotation.."
time.sleep(1.1)
X.Float() # release power
'''
X.Float(hard=False) # release power
 
 
finally:
print "stop"