Description of the data exchange protocol between LPC2378 and COM-Express module over USB
Most of the I/Os comming with Robotino 3 are still connected to a NXP LPC2378 microcontroller (MC). In contrast to previous versions of Robotino the interface between the MC and Robotino's internal industral PC is no longer RS232 but USB. This page describes the protocol used for communication between MC and PC over USB.
Package assembly
All data send from PC to MC and vice versa has the form
Field name
|
Bytes
|
Description
|
Head
|
1
|
Start of package
|
Length
|
2
|
Length of package payload
|
Payload
|
|
Payload data
|
Checksum
|
2
|
Calculated from length and payload bytes
|
Head
The package header is the unique byte 0xAA.
Length
The number of bytes of the (not escaped) payload data.
package[1] = length & 0xFF;
package[2] = 0xFF & ( length >> 8 );
Payload
The package payload data. The payload is composed of one or more commands. The payload send to the LPC2378 must not be larger than 128 bytes.
Checksum
Complement 2 of the sum of Length and Payload bytes before escaping.
uint16 calculate_checksum( const uint8* data, int dataSize )
{
uint16 out = 0;
for( int i=0; i<dataSize; ++i )
{
out += *p;
++data;
}
return 0xffff & ( (1<<16) - out );
}
Data escaping
The Head byte 0xAA must be unique through out all data send. By this the receiver knows that whenever it reads 0xAA that a new package begins. This is achieved by going through all the Length, Payload and Checksum bytes and whenever 0xAA or the escape byte 0x55 is found this byte is prefixed with 0x55 and the byte is xored with 0x20.
uint8* data; //the complete package data (Head, Length, Payload, Checksum)
uint8* escapedData; //buffer big enough to hold the escaped package data
for( int i=1; i<numBytesInData; ++i ) //not that we are starting at 1, we do not escape the Head
{
if( 0xAA == *data || 0x55 == *data )
{
*(escapedData+++) = 0x55;
*(escapedData++) = ( *data ^ 0x20 );
}
else
{
*(escapedData++) = *data;
}
++data;
}
When reading an escaped package look for the escape byte 0x55. When you found 0x55 in the stream read the next byte and xor it with 0x20 to get the unescaped value.
QByteArray read( int length ) const
{
QByteArray ba( length, 0 );
int i=0;
while( i<length )
{
char ch = 0;
if( 1 != _serial->read( (unsigned char*)&ch, 1 ) )
{
throw ParserException( "Error reading 1 byte" );
}
if( 0x55 == ch )
{
if( 1 != _serial->read( (unsigned char*)&ch, 1 ) )
{
throw ParserException( "Error reading 1 byte" );
}
ba[i] = ( ch ^ 0x20 );
}
else if( 0xAA == ch )
{
throw ParserException( "Found HEAD" );
}
else
{
ba[i] = ch;
}
++i;
}
return ba;
}
Commands
Field name
|
Bytes
|
Description
|
Tag
|
1
|
The command tag
|
Length
|
1
|
Number of bytes of command data
|
Data
|
|
The command data. If Length=0 there is no Data field at all.
|
GET_HW_VERSION
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_HW_VERSION
|
1
|
none
|
Requesting the hardware version
|
PC->MC
|
HW_VERSION
Name
|
Value
|
Command data
|
Description
|
Direction
|
HW_VERSION
|
2
|
String
|
Response to GET_HW_VERSION
|
MC->PC
|
GET_SW_VERSION
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_SW_VERSION
|
3
|
none
|
Requesting the software version
|
PC->MC
|
SW_VERSION
Name
|
Value
|
Command data
|
Description
|
Direction
|
SW_VERSION
|
4
|
String
|
Response to GET_SW_VERSION
|
MC->PC
|
GET_DISTANCE_SENSOR_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_DISTANCE_SENSOR_READINGS
|
5
|
none
|
Requesting the readings of all infrared distance sensors
|
PC->MC
|
DISTANCE_SENSOR_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
DISTANCE_SENSOR_READINGS
|
6
|
Byte
|
Type
|
Description
|
0-3
|
float32
|
ADC reading in Volts of distance sensor 0
|
...
|
32-35
|
float32
|
ADC reading in Volts of distance sensor 8
|
|
Response to GET_DISTANCE_SENSOR_READINGS.
|
MC->PC
|
SET_MOTOR_SPEED
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_SPEED
|
9
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor number
|
1-2
|
int16
|
speed set-point in rpm (rounds per minute)
|
|
Set the speed set-point for one motor
|
PC->MC
|
GET_ALL_MOTOR_SPEEDS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_MOTOR_SPEEDS
|
10
|
none
|
Requesting the speed of all motors
|
PC->MC
|
ALL_MOTOR_SPEEDS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_MOTOR_SPEEDS
|
11
|
Byte
|
Type
|
Description
|
0-1
|
int16
|
speed of motor 0 in rpm
|
...
|
6-7
|
int16
|
speed of motor 3 in rpm
|
|
Response to GET_ALL_MOTOR_SPEEDS.
|
MC->PC
|
SET_MOTOR_POSITION
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_POSITION
|
12
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor number
|
1-4
|
int32
|
motor position in encoder ticks
|
|
Set the position counter of one motor
|
PC->MC
|
GET_ALL_MOTOR_POSITIONS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_MOTOR_POSITIONS
|
13
|
none
|
Requesting the position of all motors
|
PC->MC
|
ALL_MOTOR_POSITIONS
|
14
|
Byte
|
Type
|
Description
|
0-3
|
int32
|
position of motor 0
|
...
|
12-15
|
int32
|
position of motor 4
|
|
Response to GET_ALL_MOTOR_POSITIONS.
|
MC->PC
|
SET_MOTOR_PID_PARAMETERS
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_PID_PARAMETERS
|
15
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor number
|
1-4
|
float
|
kp (a value less than 0 sets kp to the build in default)
|
5-8
|
float
|
ki (a value less than 0 sets ki to the build in default)
|
9-12
|
float
|
kd (currently not used)
|
|
Set PID parameters of one motor.
|
PC->MC
|
GET_ALL_MOTOR_PID_PARAMETERS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_MOTOR_PID_PARAMETERS
|
16
|
none
|
Requesting the PID controller parameters of all motors
|
PC->MC
|
ALL_MOTOR_PID_PARAMETERS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_MOTOR_PID_PARAMETERS
|
17
|
Byte
|
Type
|
Description
|
0-3
|
float
|
kp of motor 0
|
4-7
|
float
|
ki of motor 0
|
8-11
|
float
|
kd of motor 0
|
...
|
35-39
|
float
|
kp of motor 3
|
40-43
|
float
|
ki of motor 3
|
44-47
|
float
|
kd of motor 3
|
|
Response to GET_ALL_MOTOR_PID_PARAMETERS.
|
MC->PC
|
SET_ALL_DIGITAL_OUTPUTS
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_ALL_DIGITAL_OUTPUTS
|
18
|
Byte
|
Type
|
Description
|
0
|
uint8
|
each bit reflects the setting of one digital outputs port at Robotino's IO connector
|
|
Set digital output ports at Robotino's IO connector.
|
PC->MC
|
SET_ALL_RELAYS
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_ALL_RELAYS
|
19
|
Byte
|
Type
|
Description
|
0
|
uint8
|
bit 0 is the set-state of relay 0 at Robotino's IO connector
bit 1 is the set-state of relay 1 at Robotino's IO connector
|
|
Set the relays at Robotino's IO connector.
|
PC->MC
|
SET_ODOMETRY
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_ODOMETRY
|
20
|
Byte
|
Type
|
Description
|
0-3
|
float
|
x-position in meters
|
4-7
|
float
|
y-position in meters
|
8-11
|
float
|
rotation in radians
|
|
Set the odometry to the given pose
|
PC->MC
|
SET_ODOMETRY_ROTATION
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_ODOMETRY_ROTATION
|
21
|
Byte
|
Type
|
Description
|
0-3
|
float
|
rotation in radians
|
|
Set the odometry to the given rotation. Used when a gyroscope is connected to the PC to forward the gyroscope readings to the MC where the odometry is processed.
|
PC->MC
|
GET_ODOMETRY
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ODOMETRY
|
22
|
none
|
Request odometry readings from the MC
|
PC->MC
|
ODOMETRY
Name
|
Value
|
Command data
|
Description
|
Direction
|
ODOMETRY
|
23
|
Byte
|
Type
|
Description
|
0-3
|
float
|
x-position in meters
|
4-7
|
float
|
y-position in meters
|
8-11
|
float
|
rotation in radians
|
|
Response to GET_ODOMETRY
|
MC->PC
|
GET_ALL_MOTOR_CURRENT_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_MOTOR_CURRENT_READINGS
|
26
|
none
|
Request current readings from all motors
|
PC->MC
|
ALL_MOTOR_CURRENT_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_MOTOR_CURRENT_READINGS
|
27
|
Byte
|
Type
|
Description
|
0-3
|
float32
|
Current in Ampere drawn from motor 0
|
...
|
12-15
|
float32
|
Current in Ampere drawn from motor 3
|
|
Response to GET_ALL_MOTOR_CURRENT_READINGS.
|
MC->PC
|
GET_ALL_ANALOG_INPUTS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_ANALOG_INPUTS
|
32
|
none
|
Request all analog input readings.
|
PC->MC
|
ALL_ANALOG_INPUTS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_ANALOG_INPUTS
|
33
|
Byte
|
Type
|
Description
|
0-3
|
float32
|
ADC readings in Volts from analog input port 1
|
...
|
32-35
|
float32
|
ADC readings in Volts from analog input port 8
|
|
Response to GET_ALL_ANALOG_INPUTS. Readings of all analog input ports.
|
MC->PC
|
GET_ALL_DIGITAL_INPUTS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_DIGITAL_INPUTS
|
34
|
none
|
Request all digital input readings.
|
PC->MC
|
ALL_DIGITAL_INPUTS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_DIGITAL_INPUTS
|
35
|
uint8
|
Response to GET_ALL_DIGITAL_INPUTS. Readings of all digital input ports.
|
MC->PC
|
GET_BUMPER
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_BUMPER
|
36
|
none
|
Request all digital input readings.
|
PC->MC
|
BUMPER
Name
|
Value
|
Command data
|
Description
|
Direction
|
BUMPER
|
37
|
uint8
|
Response to GET_BUMPER. The bumpers state.
|
MC->PC
|
GET_POWER_BUTTON
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_POWER_BUTTON
|
38
|
none
|
Request all digital input readings.
|
PC->MC
|
POWER_BUTTON
Name
|
Value
|
Command data
|
Description
|
Direction
|
POWER_BUTTON
|
39
|
uint8
|
Response to GET_POWER_BUTTON. The power button state.
|
MC->PC
|
SET_FPGA_POWER
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_FPGA_POWER
|
40
|
uint8
|
Set the FPGA to hold the power supply
|
PC->MC
|
GET_FPGA_POWER
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_FPGA_POWER
|
41
|
none
|
Get the FPGA power supply hold status
|
PC->MC
|
FPGA_POWER
Name
|
Value
|
Command data
|
Description
|
Direction
|
FPGA_POWER
|
42
|
uint8
|
Response to SET_FPGA_POWER and GET_FPGA_POWER. The FPGA power supply hold status.
|
MC->PC
|
GET_PWR_OK_STATE
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_PWR_OK_STATE
|
43
|
uint8
|
Request status of the PWR_OK line.
|
PC->MC
|
PWR_OK_STATE
Name
|
Value
|
Command data
|
Description
|
Direction
|
PWR_OK_STATE
|
44
|
uint8
|
Response to GET_PWR_OK_STATE. Power OK status signal generated by the ATX power
supply to notify the module that the DC operating
voltages are within the ranges required for proper
operation.
|
MC->PC
|
SET_PWR_OK_STATE
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_PWR_OK_STATE
|
45
|
uint8
|
Set the PWR_OK line.
|
PC->MC
|
SET_PWM
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_PWM
|
46
|
Byte
|
Type
|
Description
|
0
|
uint8
|
PWM output of the LPC2378. Number in range [1-6].
|
1
|
uint8
|
PWM ratio. 0 is signal constant low. 255 is signal constant high.
|
|
Set the PWM ratio of a single PWM output.
|
PC->MC
|
SET_MOTOR_ON
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_ON
|
47
|
Byte
|
Type
|
Description
|
0
|
uint8
|
Number of motor in range [0-3].
|
1
|
uint8
|
0 switches off the high side of the motor's H-bridge. 1 switches the high side of the motor's H-bridge on.
|
|
Enable/Disable a single motor.
|
PC->MC
|
SET_PWRBTN
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_PWRBTN
|
48
|
uint8
|
Set PWRBTN# line. Power button low active signal used to wake up the
system from S5 state (soft off). This signal is
triggered on the falling edge.
|
PC->MC
|
SET_SYS_RESET
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_SYS_RESET
|
49
|
uint8
|
Reset input signal. This signal may be driven to low
by external circuitry such as a reset button to hold
the system module in hardware reset.
|
PC->MC
|
GET_COM_EXPRESS_STATES
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_COM_EXPRESS_STATES
|
50
|
none
|
Request status of the COM Express status lines.
|
PC->MC
|
COM_EXPRESS_STATES
Name
|
Value
|
Command data
|
Description
|
Direction
|
COM_EXPRESS_STATES
|
51
|
Byte
|
Type
|
Description
|
0
|
uint8
|
SUS_S3#. S3 Sleep control signal indicating that the system
resides in S3 state (Suspend to RAM).
|
1
|
uint8
|
SUS_S4#. S4 Sleep control signal indicating that the system
resides in S4 state (Suspend to Disk).
|
2
|
uint8
|
SUS_S5#. S5 Sleep Control signal indicating that the system
resides in S5 State (Soft Off).
|
3
|
uint8
|
THRM#. Thermal Alarm active low signal generated by the
external hardware to indicate an over temperature
situation. This signal can be used to initiate thermal
throttling.
|
4
|
uint8
|
THRMTRIP#
|
|
Response to GET_COM_EXPRESS_STATES.
|
MC->PC
|
GET_ALL_MOTOR_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_ALL_MOTOR_READINGS
|
52
|
none
|
Request speeds, positions, currents from all motors.
|
PC->MC
|
ALL_MOTOR_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
ALL_MOTOR_READINGS
|
53
|
Byte
|
Type
|
Description
|
0-1
|
int16
|
speed of motor 0 in rpm.
|
...
|
6-7
|
int16
|
speed of motor 4 in rpm.
|
8-11
|
int32
|
position of motor 0.
|
...
|
20-23
|
int32
|
position of motor 4.
|
24-27
|
float32
|
Current in Ampere drawn from motor 1.
|
...
|
36-39
|
float32
|
Current in Ampere drawn from motor 4.
|
|
Response to GET_ALL_MOTOR_READINGS.
|
MC->PC
|
GET_IP_ADDRESS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_IP_ADDRESS
|
54
|
none
|
Request IP4 address.
|
PC->MC
|
IP_ADDRESS
Name
|
Value
|
Command data
|
Description
|
Direction
|
IP_ADDRESS
|
55
|
Byte
|
Type
|
Description
|
0-3
|
uint32
|
IP address
|
4-7
|
uint32
|
Netmask
|
|
Response to GET_IP_ADDRESS.
|
MC->PC
|
SET_IP_ADDRESS
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_IP_ADDRESS
|
56
|
Byte
|
Type
|
Description
|
0-3
|
uint32
|
IP address
|
4-7
|
uint32
|
Netmask
|
|
Set IP4 address.
|
PC->MC
|
SET_EMERGENCY_BUMPER
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_EMERGENCY_BUMPER
|
57
|
uint8
|
1 enables the emergency bumper feature. 0 disables it. If enabled all motors are stopped for 2s if the Robotino's bumper is hit.
|
PC->MC
|
SET_MOTOR_MODE
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_MODE
|
58
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor
|
1
|
uint8
|
mode
- 0: velocity control mode
- 1: position control mode
- 2: gripper mode (only accepted for motor 3)
|
|
Set the control mode of one motor.
|
PC->MC
|
RESET_LPC
Name
|
Value
|
Command data
|
Description
|
Direction
|
RESET_LPC
|
59
|
Byte
|
Type
|
Description
|
0
|
uint8
|
- 0: Simple reset
- 1: Enter USB bootloader
|
|
Reset the LPC2378 microcontroller.
|
PC->MC
|
POWER_OFF
Name
|
Value
|
Command data
|
Description
|
Direction
|
POWER_OFF
|
60
|
none
|
Power off the system.
|
PC->MC
|
SET_POWER_SOURCE
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_POWER_SOURCE
|
61
|
Byte
|
Type
|
Description
|
0
|
uint8
|
- 0: External power
- 1: Battery pack 1
- 2: Battery pack 2
- 3: Battery pack 3
|
|
Select the systems power source.
|
PC->MC
|
GET_POWER_SOURCES
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_POWER_SOURCES
|
62
|
none
|
Request the list of available power sources.
|
PC->MC
|
POWER_SOURCES
Name
|
Value
|
Command data
|
Description
|
Direction
|
POWER_SOURCES
|
63
|
Byte
|
Type
|
Description
|
0
|
uint8
|
Boolean indicating if external power supply is availabe
|
1
|
uint8
|
Boolean indicating if battery pack 1 is availabe
|
2
|
uint8
|
Boolean indicating if battery pack 2 is availabe
|
3
|
uint8
|
Boolean indicating if battery pack 3 is availabe
|
|
Response to GET_POWER_SOURCES.
|
MC->PC
|
GET_POWER_SOURCE_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_POWER_SOURCE_READING
|
64
|
Byte
|
Type
|
Description
|
0
|
uint8
|
Power source number. See SET_POWER_SOURCE.
|
|
Request readings of the power source.
|
PC->MC
|
POWER_SOURCE_READINGS
Name
|
Value
|
Command data
|
Description
|
Direction
|
POWER_SOURCE_READINGS
|
65
|
Byte
|
Type
|
Description
|
0
|
uint8
|
Power source number.
|
1-4
|
float32
|
Power source voltage
|
5-8
|
float32
|
Power source current
|
9-12
|
float32
|
Power source remaining capacity
|
13-16
|
float32
|
Power source temperature
|
17
|
uint8
|
Battery type
- 0: Lead acid battery
- 1: NiMH battery
|
18
|
uint8
|
State of charge
|
19
|
uint8
|
Error
|
20-23
|
float32
|
Charging voltage
|
24-27
|
float32
|
Charging current
|
|
Response to POWER_SOURCE_READINGS.
|
MC->PC
|
SET_MOTOR_ACCEL_LIMITS
Name
|
Value
|
Command data
|
Description
|
Direction
|
SET_MOTOR_ACCEL_LIMITS
|
66
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor number
|
1-4
|
float
|
minimum acceleration in rpm/s
|
5-8
|
float
|
maximum acceleration in rpm/s
|
|
Set the motor's minimum and maximum acceleration
|
PC->MC
|
MOTOR_ACCEL_LIMITS
Name
|
Value
|
Command data
|
Description
|
Direction
|
MOTOR_ACCEL_LIMITS
|
67
|
Byte
|
Type
|
Description
|
0
|
uint8
|
motor number
|
1-4
|
float
|
minimum acceleration in rpm/s
|
5-8
|
float
|
maximum acceleration in rpm/s
|
|
Response to GET_MOTOR_ACCEL_LIMITS
|
MC->PC
|
GET_MOTOR_ACCEL_LIMITS
Name
|
Value
|
Command data
|
Description
|
Direction
|
GET_MOTOR_ACCEL_LIMITS
|
68
|
Byte
|
Type
|
Description
|
0
|
uint8
|
Motor number.
|
|
Request motor's acceleration limits.
|
PC->MC
|
INFO
Name
|
Value
|
Command data
|
Description
|
Direction
|
INFO
|
250
|
String
|
Transmitted to inform about some event.
|
MC->PC
|
WARNING
Name
|
Value
|
Command data
|
Description
|
Direction
|
WARNING
|
251
|
String
|
Transmitted in case of a warning.
|
MC->PC
|
ERROR
Name
|
Value
|
Command data
|
Description
|
Direction
|
ERROR
|
252
|
String
|
Transmitted in case of a communication error.
|
MC->PC
|
Data types
Name
|
Number of bytes
|
Description
|
String
|
Depends of the TAGs data length
|
Seqeunce of characters. The string is not terminated by 0.
|
uint8
|
1
|
Unsigned character
|
int8
|
1
|
Signed character
|
uint16
|
2
|
Unsigned short. Serialization is little endian.
|
int16
|
2
|
Signed short. Serialization is little endian.
|
uint32
|
4
|
Unsigned int. Serialization is little endian.
|
int32
|
4
|
Signed int. Serialization is little endian.
|
float32
|
4
|
Floating point number single precision. Serialization is little endian.
//encoding
char* data;
float f = 1.23f;
char* p = (char*)&f;
encodingData[0] = *(p++);
encodingData[1] = *(p++);
encodingData[2] = *(p++);
encodingData[3] = *(p++);
//decoding
float f2;
p = (char*)&f2;
*(p++) = encodingData[0];
*(p++) = encodingData[1];
*(p++) = encodingData[2];
*(p++) = encodingData[3];
|
Communication example
Communication between PC and MC is driven from the PC. Initially the PC will ask for the hardware and software version of the MC.
Byte number
|
Value
|
Description
|
0
|
0xAA
|
HEAD
|
1
|
0x04
|
Package length low byte
|
2
|
0x00
|
Package length high byte
|
3
|
0x01
|
GET_HW_VERSION
|
4
|
0x00
|
Data length of GET_HW_VERSION
|
5
|
0x03
|
GET_SW_VERSION
|
6
|
0x00
|
Data length of GET_SW_VERSION
|
7
|
?
|
Checksum low byte
|
8
|
?
|
Checksum high byte
|
Answer from MC
Byte number
|
Value
|
Description
|
0
|
0xAA
|
HEAD
|
1
|
0x0E
|
Package length low byte
|
2
|
0x00
|
Package length high byte
|
3
|
0x02
|
HW_VERSION
|
4
|
0x05
|
Data length of HW_VERSION
|
5
|
0x33
|
"3"
|
6
|
0x2E
|
"."
|
7
|
0x30
|
"0"
|
8
|
0x2E
|
"."
|
9
|
0x30
|
"0"
|
10
|
0x04
|
SW_VERSION
|
11
|
0x05
|
Data length of SW_VERSION
|
12
|
0x33
|
"3"
|
13
|
0x2E
|
"."
|
14
|
0x30
|
"0"
|
15
|
0x2E
|
"."
|
16
|
0x30
|
"0"
|
17
|
?
|
Checksum low byte
|
18
|
?
|
Checksum high byte
|