Developer Information - Blackmagic Design Design 3G-Sdi Arduino Shield Installations- Und Betriebs-Anleitung
Developer Information
This section of the manual provides all the details you will need if you want to write custom
libraries and develop your own hardware for your Blackmagic 3G-SDI Arduino Shield.
Physical Encoding - I
The shield operates at the following I
1.
Standard mode (100 kbit/s)
2.
Full speed (400 kbit/s)
The default 7-bit shield I
2
Shield Pin
| Function
--------------------- |-----------------------------
A4
| Serial Data (SDA)
A5
| Serial Clock (SCL)
**I
C Protocol (Writes):**
2
(START W) [REG ADDR L] [REG ADDR H] [VAL] [VAL] [VAL] ... (STOP)
**I
C Protocol (Reads):**
2
(START W) [REG ADDR L] [REG ADDR H] ... (STOP) (START R) [VAL] [VAL] [VAL] ... (STOP)
The maximum payload (shown as **VAL** in the examples above) read/write length (following the internal
register address) in a single transaction is 255 bytes.
Physical Encoding - UART
The shield operates with a UART baud rate of 115200, 8-N-1 format.
Shield Pin
| Function
--------------------- |-----------------------------
IO1
| Serial Transmit (TX)
IO0
| Serial Receive (RX)
**UART Protocol (Writes):**
[0xDC] [0x42] [REG ADDR L] [REG ADDR H] ['W'] [LENGTH] [0x00] [VAL] [VAL] [VAL] ...
**UART Protocol (Reads):**
[0xDC] [0x42] [REG ADDR L] [REG ADDR H] ['R'] [LENGTH] [0x00] [VAL] [VAL] [VAL] ...
The maximum payload (shown as **VAL** in the examples above) read/write length (specified in the
**LENGTH** field) in a single transaction is 255 bytes.
Register Address Map
The shield has the following user address register map:
Address
| Name
--------------------- |-----------
0x0000 - 0x0003
0x0004 - 0x0005
0x0006 - 0x0007
|
0x1000
| CONTROL
|
0x2000
| OCARM
0x2001
| OCLENGTH
C
2
C speeds:
2
C slave address is 0x6E.
| R/W
| Register Description
|-----
|-------------------------------
| IDENTITY
| R
| HWVERSION
| R
| FWVERSION
| R
|
|
| R/W
| System Control
|
|
| R/W
| SDI Control Override Arm
| R/W
| SDI Control Override Length
| Hardware Identifier
| Hardware Version
| Firmware Version
Developer Information
24
Kapitel
