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Difference between revisions of "CRM IV - Display data protocol"

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|0x07 || Write data bytes in message to high address.
 
|0x07 || Write data bytes in message to high address.
 
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|0x08 || Load the short address register from port A (PA0..PA7).
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|0x08 || HC05/HC04 specific command:
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Load the short address register from port A (PA0..PA7).
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|0x09 || Mask broadcast. Messages with address 0xfffe is ignored.
 
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|0x0a || Unmask broadcast. Messages with address 0xfffe is recognised.
 
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|0x0b || Shift 0xff out to SPI address 0x02. This command is for compatibility with old version of display station processor only.
 
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|0x0c || Shift 0x00 out to SPI address 0x02. This command is for compatibility with old version of display station processor only.
 
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|0x0d || Shift first data byte out to address 0x00. This command is for compatibility with old version of display station processor only.
 
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|0x0e || Shift first data byte out to address 0x01. This command is for compatibility with old version of display station processor only.
 
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|0x20 || Shift data in message out to specified SPI addresses. Data and addresses comes in pairs, first one byte of address then one byte of data. Since at most 18 bytes may be sent in one message, one message can load up to 9 external registers.
 
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|0x21 || Transmit data bytes in message on asynchronous output (9600 baud, 2 stop bit, no parity, 8 bit data).
 
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|0x22 || Use the data bytes in message as key presses, send them as digits on the cd wires. Key value 20 gives ID+specified current, key values 21-30 gives current pulse only, 31 gives C-key pulse.
 
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|0x23 || Set the PB5 pin to 5V to override handset off and volume control.
 
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|0x24 || Clear the PB5 pin to 0V, removing handset off and volume override.
 
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|0x25 || Load the main address register with the two first data bytes of  the message without looking for any pulses on PD7 pin. Most significant byte is first data byte.
 
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|0x26 || Activate PD1/TDO (low).
 
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|0x27 || Deactivate PD1/TDO (high).
 
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|0x28 || Activate PD1/TDO (low) with timeout given by data byte. Timeout is given by hex value times 100 ms.
 
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|0x29 || Start pulse train on PD1/TDO. First data byte gives on-time, second data byte gives off-time, and third data byte gives number of pulses (max 127 = 0x7f). Times are given by hex value times 100 ms.
 
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|0x2a || Same as 0x22, but four-digit version number is appended.
 
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|0x2e || Activate watchdog reset, processor dials own identity (directory number) if programmed, when coming alive.
 
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|0x2f || Stop activities in microcontroller to start watchdog reset.
 
 
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Revision as of 15:55, 14 August 2007

General The microprocessor receives messages on the asynchronous serial input. First, the message is checked for errors in transmission using the checksum. Then the processor decides whether the message is addressed to this station. Last the data bytes in the message are sent to the display, the synchronous output, the asynchronous output or as digits back to the exchange, depending on the command type. Serial format The serial format is 8 bit, no parity, 2 stop bits, 9600 baud. Message format The message consists of the following items:

  • A start of record mark, one byte. Always 0xa5.
  • Byte count. One byte giving the number of bytes in the rest of the record. The count starts at the next byte and includes the checksum byte at the end of the record.
  • Address. Two bytes telling for who this record is intended. The most significant byte comes first.
  • Command type. One byte telling what the message is about.
  • Data. Up to 18 bytes of data.
  • Checksum. One byte checksum of record, obtained by adding count byte, address bytes, command byte and data bytes, ignoring any carry.

Addresses The processor has three different address registers that it tries to match against the address of the incoming message:

  • The 16 bit main address register that is loaded by a message. The register may be loaded by a message that requires a double pulse on the polarity of the cd wire. The register is set to 0xff00 after full reset.
  • The 8 bit K-group address register that can be loaded by a message.

The address range of the incoming messages is divided as follows:

Address Interpretation
0x0000 - 0xfbff The address is compared directly with the 16 bit main address register.
0xfc00 - 0xfcff The lower 8 bits are compared with the short address register.
0xfd00 - 0xfdff The lower 8 bits are compared with the K-group address register.
0xfe00 - 0xfeff The lower 8 bits are compared with the upper 8 bits of the main address register. The processor have 0xff00 in the main address register after reset so that 0xfeff is group broadcast to all processors whose main address register is not yet loaded.
0xfffe Maskable broadcast to all processors.
0xffff Unmaskable broadcast to all processors.

Commands

The command byte tell the processor what to do. Not all commands will be supported by all systems, refer to individual product specifications for details.

Command Action description
0x01 Write data in message to low address (control register of display). Wait for display to become ready for each byte.
0x02 Write data to high address (display RAM and character generator of display). Wait for display to become ready for each byte.
0x03 Write data in message to high address, but interpret values in the range 0x10 .. 0x1f as control codes. Wait for display to become ready for each byte.
0x04 Load the main address register with the two first data bytes of message if the processor has received two pulses on the PD7 pin within a short time (less than one second). This is a double flash in the station LED and the sequence on the PD7 pin is 1-0-1-0-1. The first 1 must be present when the message is processed, meaning that the LED must be off. Most significant byte is first data byte.
0x05 Load the first data byte as the K-group address.
0x06 Write data bytes in message to low address.
0x07 Write data bytes in message to high address.
0x08 HC05/HC04 specific command:

Load the short address register from port A (PA0..PA7).

Control codes as used in command 0x03

When sending a message with command 0x03, the processor writes the data bytes to the display high address. However, bytes in the range 0x10 to 0x1f is interpreted as control codes.

Code Action description
0x10 Clear display.
0x11 Move cursor to start of first line.
0x12 Move cursor to start of second line.
0x13 Position cursor. Use the following byte as the new cursor address. Range is 0x00..0x7f. Refer to HD44780 data sheet for details.
0x14 The following byte is written to low address rather than high address.
0x15 Mask broadcast. Messages with address 0xfffe will be ignored.
0x16 Unmask broadcast. Records with address 0xfffe will be recognised.

Dialling format, frequencies and currents.

The following format is used for key data in command type 0x22, for frequencies and for currents when dialling numbers:

Key value Frequency Current Name
0x00 500 Hz Handset on Digit 0
0x01 700 Hz Handset on Digit 1
0x02 900 Hz Handset on Digit 2
0x03 1100 Hz Handset on Digit 3
0x04 1300 Hz Handset on Digit 4
0x05 1500 Hz Handset on Digit 5
0x06 1700 Hz Handset on Digit 6
0x07 1900 Hz Handset on Digit 7
0x08 2100 Hz Handset on Digit 8
0x09 2300 Hz Handset on Digit 9
0x0a 400 Hz Handset on Digit 10
0x0b 2600 Hz Handset on Digit 11
0x0c 450 Hz Handset on Digit 12
0x0d 2900 Hz Handset on Digit 13
0x0e 600 Hz Handset on Digit 14
0x0f 3200 Hz Handset on Digit 15
0x10 800 Hz Handset on Digit 16
0x11 3600 Hz Handset on Digit 17
0x12 1000 Hz Handset on Digit 18
0x13 4000 Hz Handset on Digit 19
0x14 No tone Handset on ID-pulse
0x15-0x1e No tone Handset on No action
0x1f No tone C key C key pulse
0x20 500 Hz M key M + Digit 0
0x21 700 Hz M key M + Digit 1
0x22 900 Hz M key M + Digit 2
0x23 1100 Hz M key M + Digit 3
0x24 1300 Hz M key M + Digit 4
0x25 1500 Hz M key M + Digit 5
0x26 1700 Hz M key M + Digit 6
0x27 1900 Hz M key M + Digit 7
0x28 2100 Hz M key M + Digit 8
0x29 2300 Hz M key M + Digit 9
0x2a 400 Hz M key M + Digit 10
0x2b 2600 Hz M key M + Digit 11
0x2c 450 Hz M key M + Digit 12
0x2d 2900 Hz M key M + Digit 13
0x2e 600 Hz M key M + Digit 14
0x2f 3200 Hz M key M + Digit 15
0x30 800 Hz M key M + Digit 16
0x31 3600 Hz M key M + Digit 17
0x32 1000 Hz M key M + Digit 18
0x33 4000 Hz M key M + Digit 19
0x34 No tone M key M + ID-pulse
0x35-0x3e No tone M key M pulse
0x3f No tone C key C key pulse
0x40 500 Hz Handset off Handset off + Digit 0
0x41 700 Hz Handset off Handset off + Digit 1
0x42 900 Hz Handset off Handset off + Digit 2
0x43 1100 Hz Handset off Handset off + Digit 3
0x44 1300 Hz Handset off Handset off + Digit 4
0x45 1500 Hz Handset off Handset off + Digit 5
0x46 1700 Hz Handset off Handset off + Digit 6
0x47 1900 Hz Handset off Handset off + Digit 7
0x48 2100 Hz Handset off Handset off + Digit 8
0x49 2300 Hz Handset off Handset off + Digit 9
0x4a 400 Hz Handset off Handset off + Digit 10
0x4b 2600 Hz Handset off Handset off + Digit 11
0x4c 450 Hz Handset off Handset off + Digit 12
0x4d 2900 Hz Handset off Handset off + Digit 13
0x4e 600 Hz Handset off Handset off + Digit 14
0x4f 3200 Hz Handset off Handset off + Digit 15
0x50 800 Hz Handset off Handset off + Digit 16
0x51 3600 Hz Handset off Handset off + Digit 17
0x52 1000 Hz Handset off Handset off + Digit 18
0x53 4000 Hz Handset off Handset off + Digit 19
0x54 No tone Handset off Handset off + ID-pulse
0x55-0x5e No tone Handset off Handset off pulse
0x5f No tone C key C key pulse
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