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Interchip bus
okemessi edited this page Sep 6, 2020
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This section defines the communication specifications between the MCU chips.
The MCU boards are connected by 8P8C straight RJ45 cables, which are commonly used for LAN connection.
| No | Color | Function |
|---|---|---|
| 1 | O/ | RS485+ |
| 2 | O | RS485- |
| 3 | G/ | Vref+ (To 16-bit MCU DA output) |
| 4 | Bl | 5V+ |
| 5 | Bl/ | 5V+ |
| 6 | G | Vref- (GND) |
| 7 | Br/ | GND |
| 8 | Br | GND |
- Speed:
- 9-bit (w/ ADEN bit)
- Data format: ADEN + (Hamming Syndrome) + MCU address
- Message length = 1byte
| MCU address | Chip ID | ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | (A3⊕A2⊕A1) | (A3⊕A1⊕A0) | (A3⊕A2⊕A0) | A3 | A2 | A1 | A0 | ||
| #0 | 0x00 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| #1 | 0x31 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 |
| #2 | 0x62 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 |
| #3 | 0x53 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 1 |
| #4 | 0x54 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| #F (16-bit MCU: End-of-Message signal) | 0x7F | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
(A: MCU address (1-5))
- Data format: Command + LED data (a-g) x 3
- Message length = 3byte
| ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | C2 | C1 | C0 | 3g | 3f | 3e | 3d | 3c | 0 | 3b | 3a | 2g | 2f | 2e | 2d | 2c | 2b | 0 | 2a | 1g | 1f | 1e | 1d | 1c | 1b | 1a |
(C: Command(below) 1-3: Digit (1: right hand) a-g: Segment)
| Command | meaning |
|---|---|
| 000 | Lit (Dynamic lighting @ 5ms /digit) |
| 001 | Continuous brink (180ms lit + 180ms off) |
| 010 | Short brink ((30ms off + 30ms lit) x 3) |
- Data format: 5-bit Key no. + 10-bit ADC output (For switches: 1111111111 or 0000000000)
- Message length = 2byte
| ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | ADEN | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | K4 | K3 | K2 | K1 | K0 | AD9 | AD8 | 0 | AD7 | AD6 | AD5 | AD4 | AD3 | AD2 | AD1 | AD0 |
(K: Key number AD: ADC output)
The end-of-Message signal should be transmitted after general inputs / LED Commands.
- Data format: Calling for 16bit-MCU (address: #0xF)
(#MIDI Note No.)
| Key No |
#1 Input (NW) (id=0x31) | #2 Input (SW)(id=0x62) | #3 Input (SE)(id=0x53) | #4 Input (NE)(id=0x54) |
|---|---|---|---|---|
| 0 | Shift | - | - | Shift |
| 1 | Key1(#17) | Key1(#16) | Key1(#45) | Key1(#43) |
| 2 | Key2(#19) | Key2(#18) | Key2(#47) | Key2(#46) |
| 3 | Key3(#22) | Key3(#20) | Key3(#49) | Key3(#48) |
| 4 | Key4(#24) | Key4(#21) | Key4(#51) | Key4(#50) |
| 5 | Key5(#26) | Key5(#23) | Key5(#52) | Key5(#53) |
| 6 | Key6(#29) | Key6(#25) | Key6(#54) | Key6(#55) |
| 7 | Key7(#31) | Key7(#27) | Key7(#56) | Key7(#58) |
| 8 | Key8(#34) | Key8(#28) | Key8(#57) | Key8(#60) |
| 9 | Key9(#36) | Key9(#30) | Key9(#59) | Key9(#62) |
| 10 | Key10(#38) | Key10(#32) | Key10(#61) | Key10(#65) |
| 11 | Key11(#41) | Key11(#33) | Key11(#63) | Key11(#67) |
| 12 | Fader1 | Key12(#35) | Key12(#64) | Key12(#70) |
| 13 | Fader2 | Key13(#37) | Key13(#66) | Key13(#72) |
| 14 | Button1 | Key14(#39) | Key14(#68) | Key14(#74) |
| 15 | Button2 | Key15(#40) | Key15(#69) | Exp1 |
| 16 | Button3 | Key16(#42) | Key16(#71) | Exp2 |
| 17 | Button4 | Key17(#44) | Key17(#73) | Sw1 |
| 18 | Fader3 | Key18(#75) | Sw2 | |
| 19 | Key19(#76) | |||
| 20 | ||||
| ︙ | ||||
| 31 |