Inputs and Outputs

The NeuralPlex has a separate Vehicle Interface Processor (VIP) that is responsible for all analog inputs, PWM outputs, VRef, RS232/485, and LIN. It also shares three of the four CAN buses with the SOC, allowing it to send/recieve CAN messages during the early boot process. The VIP interfaces with the SOC via a high speed SPI bus, and is used by the SOC to configure the baud rate of each CAN bus to ensure the VIP and SOC do not have conflicting baud rates. The SPI bus is configured as show below.

Bus Settings

MSB first
SCLK active high
CS active low
Data capture on 1st edge, shift (transmit) on 2nd
100kHz clock speed

Frame Structure

OP Code	Data Packet
1 Byte	4 Bytes
MSB<---	--->LSB

OP Codes

0x00 - NOP
0x10 - ANALOG_INPUT_READ
0x11 - ANALOG_INPUT_CONFIG
0x20 - PWM_ENABLE
0x21 - PWM_CONFIG
0x30 - VREF_ENABLE
0x31 - VREF_CONFIG
0x41 - CAN_BAUD_RATE_CONFIG
0x50 - RS232_STREAM
0x51 - RS232_CONFIG
0x60 - DATA_READY_DECODE
0x61 - DATA_RECEIVE

Messages

Individual messages are outlined in the protocol below. The ID represents the OP Code, Byte 0 represents MSB. Message with ID of 0x1XY represents the response message sent back to the SOC (master) one frame after receiving 0xXY. A full frame of 0’s serves as a NOP to allow the SOC to receive a response without sending more data to the VIP. Response to NOP will also be a frame consisting entirely of 0’s.

SPI Protocol

FormatVersion=6.0 // Do not edit this line!
Title="SOC to VIP SPI Bus Protocol"

{ENUMS}
Enum=PWM_PARAMETER(0="FREQUENCY", 1="PERIOD", 2="DUTY_CYCLE")
Enum=PARITY(0="NONE", 1="ODD", 2="EVEN", 3="MARK", 4="SPACE")
Enum=ADC_RESOLUTION(0="10", 1="11", 2="12")
Enum=DATA_TYPE(0="NONE", 1="STATUSES", 2="RS232", 3="RS485")

{SENDRECEIVE}

[PWM_CONFIG]
ID=021h
Var=PWM_PARAMTER unsigned 0,2 /max:1 /e:PWM_PARAMETER
Var=VALUE unsigned 8,24 -m /max:1
Var=CHANNELS unsigned 4,4

[PWM_ENABLE]
ID=020h
Var=ENABLE unsigned 0,4 /max:1

[VREF_CONFIG]
ID=031h
Var=VALUE unsigned 0,32 -m /max:1

[VREF_ENABLE]
ID=030h
Var=ENABLE unsigned 0,1

[RS232_CONFIG]
ID=051h
Var=BAUD_RATE unsigned 0,5 /max:1
Var=RS485_FLAG unsigned 7,1
Var=BITS_PER_CHAR unsigned 8,4 /max:1
Var=PARITY unsigned 12,3 /max:1 /e:PARITY
Var=STOP_BITS unsigned 15,1

[RS232_STREAM]
ID=050h
Var=TX unsigned 0,32 -m /max:1

[ANALOG_INPUT_CONFIG]
ID=011h
Var=RESOLUTION unsigned 0,2 /max:1 /e:ADC_RESOLUTION

[ANALOG_INPUT_READ]
ID=010h
Var=CHANNEL unsigned 0,4 /max:1

[CAN_BAUD_RATE_CONFIG]
ID=041h
Var=CHANNEL unsigned 0,4 /max:1
Var=VALUE unsigned 8,24 -m /max:1

[ANALOG_INPUT_CONFIG_Response]
ID=111h
Var=RESOLUTION unsigned 0,2 /max:1 /e:ADC_RESOLUTION

[ANALOG_INPUT_READ_Response]
ID=110h
Var=CHANNEL unsigned 0,4 /max:1
Var=VALUE unsigned 8,16 -m /max:1

[CAN_BAUD_RATE_CONFIG_Response]
ID=141h
Var=CHANNEL unsigned 0,4 /max:1
Var=VALUE unsigned 8,24 -m /max:1

[PWM_CONFIG_Response]
ID=121h
Var=PWM_PARAMTER unsigned 0,2 /max:1 /e:PWM_PARAMETER
Var=VALUE unsigned 8,24 -m /max:1
Var=CHANNELS unsigned 4,4

[PWM_ENABLE_Response]
ID=120h
Var=ENABLE unsigned 0,4 /max:1

[RS232_CONFIG_Response]
ID=151h
Var=BAUD_RATE unsigned 0,5 /max:1
Var=RS485_FLAG unsigned 7,1
Var=BITS_PER_CHAR unsigned 8,4 /max:1
Var=PARITY unsigned 12,3 /max:1 /e:PARITY
Var=STOP_BITS unsigned 15,1

[RS232_STREAM_Response]
ID=150h
Var=TX unsigned 0,32 -m /max:1

[VREF_CONFIG_Response]
ID=131h
Var=VALUE unsigned 0,32 -m /max:1

[VREF_ENABLE_Response]
ID=130h
Var=ENABLE unsigned 0,1

[NOP]
ID=000h

[NOP_Response]
ID=100h

[DATA_READY_DECODE]
ID=060h

[DATA_READY_DECODE_Response]
ID=160h
Var=DATA_TYPE unsigned 0,2 /e:DATA_TYPE
Var=BYTES unsigned 8,8

[DATA_RECEIVE]
ID=061h

[DATA_RECEIVE_Response]
ID=161h
Var=DATA unsigned 0,32 -m