Kurobox Pro Microcomputer Communication Specifications
Contents
Contents
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Functions
Overview of Functions
Communicates with the main CPU via UART. The main functions are shown below.
- Power SW monitoring
- Initialization SW monitoring
- Power control
- Temperature measurement
- Buzzer control
- Watchdog function (However, watchdog function is disabled on u-boot)
- LAN ACT monitoring
- LED display
- Reset sequence generation
- LED Illumination
UART Communication with Main CPU
Transmission System
UART Basic Settings
- Transmission speed: 38400bps
- Data bit: 8bit
- Parity: Even
- Stop bit: 1 bit or more
Communication with Main CPU
- Basic communication is performed by the transmission of commands, data, and parity.
- When switches etc are pressed, a level interrupt occurs. The interrupt is cleared when reporting to the CPU is completed.
- If many frame errors occur, regulate the guard time on the main CPU.
Protocol
Preamble
The receive buffer is completely cleared by sending FF 35 times.
Main CPU -> Microcomputer
Data Payload 0 Bytes
| 1 | Transfer
direction (BIT7) |
Data payload (0) |
| 2 | Command | |
| 3 | Parity 0-(byte1+byte2) |
Data Payload n bytes
| 1 | Transfer
direction (BIT7) |
Data payload () |
| 2 | Command | |
| 3 | Data 0 | |
| • • | ||
| n-1 | Data n | |
| n | Parity 0 - Σ(byte 1 to byte n-1) |
Microcomputer -> Main CPU
Responses to commands other than the read command (when data does not exist)
| 1 | 0
(BIT7) |
Data payload (1) |
| 2 | Sent command | |
| 3 | ACK | |
| 4 | Parity 0-(byte1+byte2+byte3) |
Response to read command
| 1 | 0
(BIT7) |
Data payload (N) |
| 2 | Sent command | |
| 3 | Data 1 | |
| n-1 | Data N | |
| n | Parity 0 - Σ(byte 1 to byte n-1) |
Response when communication error occurs
| 1 | 0
(BIT7) |
Data payload (1) |
| 2 | Sent command | |
| 3 | NACK | |
| 4 | Parity 0-(byte1+byte2+byte3) |
ACK/NACK List
| HEX | mnemonic | |
|---|---|---|
| 0x00 | ACK | Good |
| 0xF1 | OVER_RUN | UART physical layer error Physical layer buffer over |
| 0xF2 | FRAMING_ERR | UART physical layer error Physical layer frame error |
| 0xF3 | PARITYERROR | UART physical layer error Physical layer parity error |
| 0xF4 | Invalid_COM | Command does not exist |
| 0xF5 | Com_len_err | Command and data payload values do not correspond |
| 0xF6 | RX_BUFF_OVER | Payload larger than 32 bytes specified. |
| 0xF7 | DATA_PARITY_ERROR | Data parity is wrong. |
Write Command
LED Lighting control etc Command Micro- computer CPU DATA0 DATA1 DATAn(MAX31) PARITY Switch to data transfer phase Switch to command phase Command (OPCODE) ACK Command Command 2nd byte PARITY
Read Command
Temperature read by CPU DATA0 DATA1 DATAn(MAX31) PARITY Command (OPCODE) PARITY Command CPU Micro- computer Switch to data transfer phase Switch to command phase
Interrupt + Read Command
SW Micro- computer DATA0 DATA1 DATAn(MAX31) PARITY Interrupt assert Interrupt negate Switch to data transfer phase Switch to command phase Command (OPCODE) PARITY Command CPU
Command
Command Construction
The command is a 2 byte command.
Write (CPU -> Microcomputer)
| bit7 | bit6 | bit5 | bit4 | bit3 | bit2 | bit1 | bit0 |
| 0 | 0 | Length | |||||
| bit7 | bit6 | bit5 | bit4 | bit3 | bit2 | bit1 | bit0 |
| OPCODE | |||||||
Read (Microcomputer -> CPU)
| bit7 | bit6 | bit5 | bit4 | bit3 | bit2 | bit1 | bit0 |
| 1 | 0 | ||||||
| bit7 | bit6 | bit5 | bit4 | bit3 | bit2 | bit1 | bit0 |
| OPCODE | |||||||
Command List
Commands with no data payload
| Command | Command name | Microcomputer operation | |
|---|---|---|---|
| 1Byte | 2Byte | ||
| FF | --- | NOP | Used in preamble |
| 0x00 | 0x02 | BOOT_START | Boot starts, CPU sends this command at the start. If
this command is not received within 10 seconds after reset, power does not go on. This is displayed during boot. |
| 0x00 | 0x03 | BOOT_END | The boot display is completed, and the device
operates normally. If this command is not received within 5 minutes, power goes off. |
| 0x00 | 0x06 | POFF | Power switches off. |
| 0x00 | 0x0C | SHUT_DOWN_WAIT | SHUT DOWN preparations |
| 0x00 | 0x0D | SHUT_DOWN_WAIT_N | Cancel SHUT DOWN preparations |
| 0x00 | 0x0E | REBOOT | REBOOT (system reset) start |
Data Payload 1 Byte Command
| Command | Command name | Microcomputer operation | |
|---|---|---|---|
| 1Byte | 2Byte | ||
| 0x01 | 0x30 | BZ_ON | Buzzer sounds.Buzzer control, with fine selection of
whether to sound for 1 byte of data |
| -------- | |||
| 0x01 | 0x33 | FANSPEED_CTL | FAN speed can be selected.0 Stopped 3 Maximum
Settings above 3 (only enabled for lower 2 bits) |
| 0x80 | |||
| 0x01 | 0x35 | SYSTEM_WDT | Performs clear and settings for system
watchdog. |
| 0x80 | |||
| 0x37 | TEMP | Obtains the temperature.Receivable data is in Centigrade | |
| 0x80 | |||
| 0x38 | FANSPEED | Obtains fan speed informationDouble the number of FAN revolutions in 3
seconds is displayed. rpm= (obtained data) ×10. | |
| 0x80 | |||
| 0x01 | 0x3a | LED_BRIGHT | Adjusts the brightness of the current LED |
| 0x80 | |||
| 0x01 | 0x3b | HDD_POWER | Controls the HDD power supply |
| 0x80 | |||
| 0x3c | MAIN_STATUS | Obtains the STATUS of the microcomputer | |
| 0x80 | |||
Data Payload 2 Byte Command
| Command | Command name | Microcomputer operation | |
|---|---|---|---|
| 1Byte | 2Byte | ||
| 0x02 | 0x50 | LED_CPU_MCON | Switches LED between main CPU controland microcomputer control. |
| 0x80 | |||
| 0x02 | 0x51 | LED_ON_OFF | Controls whether the LED is on or off |
| 0x80 | |||
| 0x02 | 0x52 | LED_BLINK | Selects the LED for LED flashing display |
| 0x80 | |||
| 0x02 | 0x53 | BZ_FREQ | Buzzer frequency settings |
| 0x80 | |||
| 0x02 | 0x54 | LED_PATTERN | Controls LED flashing |
| 0x80 | |||
Buzzer ON/OFF
Command
| 0×01 | First operand read 0×80 |
| 0×30 | Second operand |
Data
| 0×00 | Stop the sound |
| 0×01 | [Pi-po] |
| 0×02 | [Pi] |
| 0×03 | Continuous sound [Piiiii-] |
| 0×04 | Sounds every 0.3 seconds |
| 0×10 | Repeats sounding for 0.5 seconds then stopping for 0.3 seconds. |
| 0×20 | [Pi-po-pa-po] |
Buzzer pitch
Command
0×02 First operand setting 0×80 First operand reading of settings. 0×53 Second operand
Data 0
Frequency settings lower order
Data 1
Frequency settings upper order
Relationship between sound pitch and frequency
A A# B C C#D D# E F F# G G# 55 58 62 65 69 73 78 82 87 92 98 104 110 117 123 131 139 147 156 165 175 185 196 208 220 233 247 262 277 294 311 330 349 370 392 415 440 466 494 523 554 587 622 659 698 740 784 831 880 932 988104711091175124513191397148015681661 176018651976209322172349248926372794296031363322 Relationship between values set on microcomputer and sound pitch A A# B C C#D D# E F F# G G# FC04F062 E273 D60AC852 BE8CB399 A9D69F70 963D 8E0B858C7F08 7746 7068 6A4A6429 5EB25949 5475 4FB8 4B1E 4705 430F 3F42 3BA33868 3525 323D2F59 2CC52A3A27DC25A6 2382 2187 1FA1 1DE01C34 1A9E191E17B5 1662 151D13EE12CD 11C1 10C3 0FD00EEC0E16 0D4C0C8C0BD80B2F0A8E09F7 0968 08E0 0860 07E8 0777 070C06A6 0647 05EC0597 0547 04FB04B4 3F4 1FA FD
System Watchdog
Command
0×01 First operand read 0×80 when setting 0×35 Second operand
Data
Set the time until the power goes OFF for forced OFF. You can set up to 255 seconds. However, setting to 0 will cause the system watchdog to stop and not operate. If read is performed, the time for the watchdog to operate is displayed. 0×FF – (time to shutdown) = Setting value
Temperature Read
Command
0×80 First Operand (read only) 0×37 Second operand
Data
The temperature on the board can be read. The read data is signed char. The data is from -55°C to 125°C.
SW Read
Command
0x80 First Operand (read only) 0×36 Second operand
Data
bit7-bit4 bit4 bit3 bit2 bit1 Bit0 0 1 F_INIT_SW 1 1 Power SW KURO BOX/PRO Microcomputer Communication Specifications Rev.1.0 14/16 If SW or INITSW is pressed, an interrupt occurs. You can research the cause of an interrupt by reading the SW. Reading this resistor clears the interrupt.
- If the SW is released at the point when read is started, the value returns to 1. Therefore,
measure the pressed time on the CPU to judge. bit4: Always 1 bit3: 0 when INIT_SW is pressed bit2: Always 1 bit1: Always 1 bit0: Power_SW 0 when Power_SW is pressed
LED Display
Command
0x01 First operand read 0x80 when setting Second operand Switching LED control rights: 0×50 Switching LED on/off: 0×51 Flash LED: 0×52
Data
DATA0 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0 0 0 0 LINK DIAG INFO Power DATA1 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0 0 0 0 0 0 0 0
Data Meaning
Control Rights Switching • 0: LED control performed by microcomputer • 1: LED control performed by CPU Switching on/off • 0: Switch LED off • 1: Light LED Flash Switching • 0: Do not flash LED • 1: Flash LED
LED brightness
Command
0×00 First operand 0×80 read 0X3a Second operand
Data
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0 LED Illumination
Data Meaning
LED Illumination Setting possible in the 0-0xf range 0×0= Off 0×f = Maximum illumination
HDD Power control
Command
0×00 First operand 0×80 (read) 0X3b Second operand
Data
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0 0 0 HDD
ACK/NACK List
HEX mnemonic 0x00 ACK Good 0xF1 OVER_RUN UART physical layer error Physical layer buffer over 0xF2 FRAMING_ERR UART physical layer error Physical layer frame error 0xF3 PARITYERROR UART physical layer error Physical layer parity error 0xF4 Invalid_COM Command does not exist 0xF5 Com_len_err Command and data payload values do not correspond 0xF6 RX_BUFF_OVER Payload larger than 32 bytes specified. 0xF7 DATA_PARITY_ERROR Data parity is wrong.
