from pymodbus.client.sync import ModbusSerialClient as ModbusClient
import numpy as np
class Controller:
def __init__(self, port="/dev/ttyUSB0"):
self._port = port
self.client = ModbusClient(method='rtu', port=self._port, baudrate=115200, timeout=1)
self.client.connect()
self.ID = 1
######################
## Register Address ##
######################
## Common
self.CONTROL_REG = 0x200E
self.OPR_MODE = 0x200D
self.L_ACL_TIME = 0x2080
self.R_ACL_TIME = 0x2081
self.L_DCL_TIME = 0x2082
self.R_DCL_TIME = 0x2083
## Velocity control
self.L_CMD_RPM = 0x2088
self.R_CMD_RPM = 0x2089
self.L_FB_RPM = 0x20AB
self.R_FB_RPM = 0x20AC
## Position control
self.POS_CONTROL_TYPE = 0x200F
self.L_MAX_RPM_POS = 0x208E
self.R_MAX_RPM_POS = 0x208F
self.L_CMD_REL_POS_HI = 0x208A
self.L_CMD_REL_POS_LO = 0x208B
self.R_CMD_REL_POS_HI = 0x208C
self.R_CMD_REL_POS_LO = 0x208D
self.L_FB_POS_HI = 0x20A7
self.L_FB_POS_LO = 0x20A8
self.R_FB_POS_HI = 0x20A9
self.R_FB_POS_LO = 0x20AA
## Troubleshooting
self.L_FAULT = 0x20A5
self.R_FAULT = 0x20A6
########################
## Control CMDs (REG) ##
########################
self.EMER_STOP = 0x05
self.ALRM_CLR = 0x06
self.DOWN_TIME = 0x07
self.ENABLE = 0x08
self.POS_SYNC = 0x10
self.POS_L_START = 0x11
self.POS_R_START = 0x12
####################
## Operation Mode ##
####################
self.POS_REL_CONTROL = 1
self.POS_ABS_CONTROL = 2
self.VEL_CONTROL = 3
self.ASYNC = 0
self.SYNC = 1
#################
## Fault codes ##
#################
self.NO_FAULT = 0x0000
self.OVER_VOLT = 0x0001
self.UNDER_VOLT = 0x0002
self.OVER_CURR = 0x0004
self.OVER_LOAD = 0x0008
self.CURR_OUT_TOL = 0x0010
self.ENCOD_OUT_TOL = 0x0020
self.MOTOR_BAD = 0x0040
self.REF_VOLT_ERROR = 0x0080
self.EEPROM_ERROR = 0x0100
self.WALL_ERROR = 0x0200
self.HIGH_TEMP = 0x0400
self.FAULT_LIST = [self.OVER_VOLT, self.UNDER_VOLT, self.OVER_CURR, self.OVER_LOAD, self.CURR_OUT_TOL, self.ENCOD_OUT_TOL, \
self.MOTOR_BAD, self.REF_VOLT_ERROR, self.EEPROM_ERROR, self.WALL_ERROR, self.HIGH_TEMP]
##############
## Odometry ##
##############
## 8 inches wheel
self.travel_in_one_rev = 0.655
self.cpr = 16385
self.R_Wheel = 0.105 #meter
print(self.R_Wheel)
## Some time if read immediatly after write, it would show ModbusIOException when get data from registers
def modbus_fail_read_handler(self, ADDR, WORD):
read_success = False
reg = [None]*WORD
while not read_success:
result = self.client.read_holding_registers(ADDR, WORD, unit=self.ID)
try:
for i in range(WORD):
reg[i] = result.registers[i]
read_success = True
except AttributeError as e:
print(e)
pass
return reg
def rpm_to_radPerSec(self, rpm):
return rpm*2*np.pi/60.0
def rpm_to_linear(self, rpm):
W_Wheel = self.rpm_to_radPerSec(rpm)
V = W_Wheel*self.R_Wheel
return V
def set_mode(self, MODE):
if MODE == 1:
print("Set relative position control")
elif MODE == 2:
print("Set absolute position control")
elif MODE == 3:
print("Set speed rpm control")
else:
print("set_mode ERROR: set only 1, 2, or 3")
return 0
result = self.client.write_register(self.OPR_MODE, MODE, unit=self.ID)
return result
def get_mode(self):
# result = self.client.read_holding_registers(self.OPR_MODE, 1, unit=self.ID)
registers = self.modbus_fail_read_handler(self.OPR_MODE, 1)
mode = registers[0]
return mode
def enable_motor(self):
result = self.client.write_register(self.CONTROL_REG, self.ENABLE, unit=self.ID)
def disable_motor(self):
result = self.client.write_register(self.CONTROL_REG, self.DOWN_TIME, unit=self.ID)
def get_fault_code(self):
fault_codes = self.client.read_holding_registers(self.L_FAULT, 2, unit=self.ID)
L_fault_code = fault_codes.registers[0]
R_fault_code = fault_codes.registers[1]
L_fault_flag = L_fault_code in self.FAULT_LIST
R_fault_flag = R_fault_code in self.FAULT_LIST
return (L_fault_flag, L_fault_code), (R_fault_flag, R_fault_code)
def clear_alarm(self):
result = self.client.write_register(self.CONTROL_REG, self.ALRM_CLR, unit=self.ID)
def set_accel_time(self, L_ms, R_ms):
if L_ms > 32767:
L_ms = 32767
elif L_ms < 0:
L_ms = 0
if R_ms > 32767:
R_ms = 32767
elif R_ms < 0:
R_ms = 0
result = self.client.write_registers(self.L_ACL_TIME, [int(L_ms),int(R_ms)], unit=self.ID)
def set_decel_time(self, L_ms, R_ms):
if L_ms > 32767:
L_ms = 32767
elif L_ms < 0:
L_ms = 0
if R_ms > 32767:
R_ms = 32767
elif R_ms < 0:
R_ms = 0
result = self.client.write_registers(self.L_DCL_TIME, [int(L_ms), int(R_ms)], unit=self.ID)
def int16Dec_to_int16Hex(self,int16):
lo_byte = (int16 & 0x00FF)
hi_byte = (int16 & 0xFF00) >> 8
all_bytes = (hi_byte << 8) | lo_byte
return all_bytes
def set_rpm(self, L_rpm, R_rpm):
if L_rpm > 3000:
L_rpm = 3000
elif L_rpm < -3000:
L_rpm = -3000
if R_rpm > 3000:
R_rpm = 3000
elif R_rpm < -3000:
R_rpm = -3000
left_bytes = self.int16Dec_to_int16Hex(L_rpm)
right_bytes = self.int16Dec_to_int16Hex(R_rpm)
result = self.client.write_registers(self.L_CMD_RPM, [left_bytes, right_bytes], unit=self.ID)
def get_rpm(self):
# rpms = self.client.read_holding_registers(self.L_FB_RPM, 2, unit=self.ID)
# fb_L_rpm = np.int16(rpms.registers[0])/10.0
# fb_R_rpm = np.int16(rpms.registers[1])/10.0
registers = self.modbus_fail_read_handler(self.L_FB_RPM, 2)
fb_L_rpm = np.int16(registers[0])/10.0
fb_R_rpm = np.int16(registers[1])/10.0
return fb_L_rpm, fb_R_rpm
def get_linear_velocities(self):
rpmL, rpmR = self.get_rpm()
VL = self.rpm_to_linear(rpmL)
VR = self.rpm_to_linear(-rpmR)
return VL, VR
def map(self, val, in_min, in_max, out_min, out_max):
return (val - in_min) * (out_max - out_min) / (in_max - in_min) + out_min
def set_maxRPM_pos(self, max_L_rpm, max_R_rpm):
if max_L_rpm > 1000:
max_L_rpm = 1000
elif max_L_rpm < 1:
max_L_rpm = 1
if max_R_rpm > 1000:
max_R_rpm = 1000
elif max_R_rpm < 1:
max_R_rpm = 1
result = self.client.write_registers(self.L_MAX_RPM_POS, [int(max_L_rpm), int(max_R_rpm)], unit=self.ID)
def set_position_async_control(self):
result = self.client.write_register(self.POS_CONTROL_TYPE, self.ASYNC, unit=self.ID)
def move_left_wheel(self):
result = self.client.write_register(self.CONTROL_REG, self.POS_L_START, unit=self.ID)
def move_right_wheel(self):
result = self.client.write_register(self.CONTROL_REG, self.POS_R_START, unit=self.ID)
def deg_to_32bitArray(self, deg):
dec = int(self.map(deg, -1440, 1440, -65536, 65536))
HI_WORD = (dec & 0xFFFF0000) >> 16
LO_WORD = dec & 0x0000FFFF
return [HI_WORD, LO_WORD]
def set_relative_angle(self, ang_L, ang_R):
L_array = self.deg_to_32bitArray(ang_L)
R_array = self.deg_to_32bitArray(ang_R)
all_cmds_array = L_array + R_array
result = self.client.write_registers(self.L_CMD_REL_POS_HI, all_cmds_array, unit=self.ID)
def get_wheels_travelled(self):
# read_success = False
# while not read_success:
# result = self.client.read_holding_registers(self.L_FB_POS_HI, 4, unit=self.ID)
# try:
# l_pul_hi = result.registers[0]
# l_pul_lo = result.registers[1]
# r_pul_hi = result.registers[2]
# r_pul_lo = result.registers[3]
# l_pulse = ((l_pul_hi & 0xFFFF) << 16) | (l_pul_lo & 0xFFFF)
# r_pulse = ((r_pul_hi & 0xFFFF) << 16) | (r_pul_lo & 0xFFFF)
# l_travelled = (float(l_pulse)/self.cpr)*self.travel_in_one_rev # unit in meter
# r_travelled = (float(r_pulse)/self.cpr)*self.travel_in_one_rev # unit in meter
# read_success = True
# except AttributeError:
# # print("error")
# pass
registers = self.modbus_fail_read_handler(self.L_FB_POS_HI, 4)
l_pul_hi = registers[0]
l_pul_lo = registers[1]
r_pul_hi = registers[2]
r_pul_lo = registers[3]
l_pulse = np.int32(((l_pul_hi & 0xFFFF) << 16) | (l_pul_lo & 0xFFFF))
r_pulse = np.int32(((r_pul_hi & 0xFFFF) << 16) | (r_pul_lo & 0xFFFF))
l_travelled = (float(l_pulse)/self.cpr)*self.travel_in_one_rev # unit in meter
r_travelled = (float(r_pulse)/self.cpr)*self.travel_in_one_rev # unit in meter
return l_travelled, r_travelled
