Kart/serial link

(Difference between revisions)
Jump to: navigation, search
(Hardware control)
(Kart to SmartPhone)
Line 122: Line 122:
 
|-
 
|-
 
| 2
 
| 2
| UINT1
+
| UINT2
| Steering status: 0x01 means angle reached
+
| Steering status: bit 0 stepper end, bit 1 position reached
 
|-
 
|-
 
| 3
 
| 3
Line 131: Line 131:
 
| 4
 
| 4
 
| UINT1
 
| UINT1
| Stepper End (bit is '0' when end switch is pressed)
+
| Stepper End from I/O board, bit 0
 
|-
 
|-
 
| 5
 
| 5

Revision as of 10:03, 4 September 2014

Contents

Serial link protocol

This section defines the serial link protocol used to communicate between the Kart and the SmartPhone. All data is spontaneous send and can not be polled.

Serial port

Communication is done with:

  • 115200 baud
  • 8 bits
  • no parity
  • no handshake

Message Format

SoF (1 byte) Address (1 byte) Data (2 bytes) EoF (1 byte)
0x55 UINT8 UINT16/INT16 0xAA

Registers

SmartPhone to Kart

Address Datatype Description
0 UINT16 DC motor PWM period
1 INT5 DC motor speed: -15 to 15 (Negative numbers = backwards)
2 UINT16 Stepper motor period (speed proportional to 1/period)
3 UINT16 Desired steering angle
4 UINT5 End switch address
5 UINT5 Hardware control
6 UINT4 LEDs
15 UINT16 Serial link update interval [ms]

Hardware control

Bit Meaning Description
0 Kart goes as DC motor When '0', the kart goes backwards when the motor turns forwards
1 Kart turns right (clockwise) When '1', kart turns to the right as stepper motor phases go from 1 to 4
2 End sensor is on left side If '1', the angles are measured clockwise
3 Stepper end emulates an end switch contact for the direction motor
4 Restart Puts following slaves back in startup mode: stepper motor
5 Bluetooth connected Indicates that the Bluetooth connection is established

The end sensor always defines position 0. Angles are always positive.

If bits 1 and 2 are different, the stepper motor phase sequence has to be inverted.

If the Bluetooth connection is lost, the DC motor has to be stopped.

Kart to SmartPhone

Address Datatype Description
0 UINT16 Hall speed count 1
1 UINT16 Hall speed count 2
2 UINT2 Steering status: bit 0 stepper end, bit 1 position reached
3 UINT16 Actual Steering Angle
4 UINT1 Stepper End from I/O board, bit 0
5 UINT16 ADC Value of the Battery Voltage Level
6 UINT16 Distance
8 UINT16 Proximity 1
9 UINT16 Proximity 2
10 UINT16 Proximity 3
11 UINT16 Proximity 4
12 UINT16 Ambient Light 1
13 UINT16 Ambient Light 2
14 UINT16 Ambient Light 3
15 UINT16 Ambient Light 4
Personal tools
Namespaces
Variants
Actions
Navigation
Modules / Projects
Browse
Toolbox