565 lines
17 KiB
C
565 lines
17 KiB
C
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/*
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* Driver definitions for the FTDI USB Single Port Serial Converter -
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* known as FTDI_SIO (Serial Input/Output application of the chipset)
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*
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* For USB vendor/product IDs (VID/PID), please see ftdi_sio_ids.h
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*
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*
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* The example I have is known as the USC-1000 which is available from
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* http://www.dse.co.nz - cat no XH4214 It looks similar to this:
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* http://www.dansdata.com/usbser.htm but I can't be sure There are other
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* USC-1000s which don't look like my device though so beware!
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*
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* The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side,
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* USB on the other.
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*
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* Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details
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* of the protocol required to talk to the device and ongoing assistence
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* during development.
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*
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* Bill Ryder - bryder@sgi.com formerly of Silicon Graphics, Inc.- wrote the
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* FTDI_SIO implementation.
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*
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*/
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/* Commands */
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#define FTDI_SIO_RESET 0 /* Reset the port */
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#define FTDI_SIO_MODEM_CTRL 1 /* Set the modem control register */
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#define FTDI_SIO_SET_FLOW_CTRL 2 /* Set flow control register */
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#define FTDI_SIO_SET_BAUD_RATE 3 /* Set baud rate */
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#define FTDI_SIO_SET_DATA 4 /* Set the data characteristics of
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the port */
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#define FTDI_SIO_GET_MODEM_STATUS 5 /* Retrieve current value of modem
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status register */
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#define FTDI_SIO_SET_EVENT_CHAR 6 /* Set the event character */
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#define FTDI_SIO_SET_ERROR_CHAR 7 /* Set the error character */
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#define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */
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#define FTDI_SIO_GET_LATENCY_TIMER 10 /* Get the latency timer */
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/* Interface indices for FT2232, FT2232H and FT4232H devices */
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#define INTERFACE_A 1
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#define INTERFACE_B 2
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#define INTERFACE_C 3
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#define INTERFACE_D 4
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/*
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* BmRequestType: 1100 0000b
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* bRequest: FTDI_E2_READ
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* wValue: 0
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* wIndex: Address of word to read
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* wLength: 2
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* Data: Will return a word of data from E2Address
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*
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*/
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/* Port Identifier Table */
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#define PIT_DEFAULT 0 /* SIOA */
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#define PIT_SIOA 1 /* SIOA */
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/* The device this driver is tested with one has only one port */
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#define PIT_SIOB 2 /* SIOB */
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#define PIT_PARALLEL 3 /* Parallel */
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/* FTDI_SIO_RESET */
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#define FTDI_SIO_RESET_REQUEST FTDI_SIO_RESET
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#define FTDI_SIO_RESET_REQUEST_TYPE 0x40
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#define FTDI_SIO_RESET_SIO 0
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#define FTDI_SIO_RESET_PURGE_RX 1
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#define FTDI_SIO_RESET_PURGE_TX 2
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/*
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* BmRequestType: 0100 0000B
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* bRequest: FTDI_SIO_RESET
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* wValue: Control Value
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* 0 = Reset SIO
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* 1 = Purge RX buffer
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* 2 = Purge TX buffer
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* wIndex: Port
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* wLength: 0
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* Data: None
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*
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* The Reset SIO command has this effect:
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*
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* Sets flow control set to 'none'
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* Event char = $0D
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* Event trigger = disabled
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* Purge RX buffer
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* Purge TX buffer
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* Clear DTR
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* Clear RTS
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* baud and data format not reset
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*
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* The Purge RX and TX buffer commands affect nothing except the buffers
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*
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*/
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/* FTDI_SIO_SET_BAUDRATE */
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#define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0x40
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#define FTDI_SIO_SET_BAUDRATE_REQUEST 3
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/*
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* BmRequestType: 0100 0000B
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* bRequest: FTDI_SIO_SET_BAUDRATE
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* wValue: BaudDivisor value - see below
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* wIndex: Port
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* wLength: 0
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* Data: None
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* The BaudDivisor values are calculated as follows:
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* - BaseClock is either 12000000 or 48000000 depending on the device.
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* FIXME: I wish I knew how to detect old chips to select proper base clock!
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* - BaudDivisor is a fixed point number encoded in a funny way.
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* (--WRONG WAY OF THINKING--)
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* BaudDivisor is a fixed point number encoded with following bit weighs:
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* (-2)(-1)(13..0). It is a radical with a denominator of 4, so values
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* end with 0.0 (00...), 0.25 (10...), 0.5 (01...), and 0.75 (11...).
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* (--THE REALITY--)
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* The both-bits-set has quite different meaning from 0.75 - the chip
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* designers have decided it to mean 0.125 instead of 0.75.
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* This info looked up in FTDI application note "FT8U232 DEVICES \ Data Rates
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* and Flow Control Consideration for USB to RS232".
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* - BaudDivisor = (BaseClock / 16) / BaudRate, where the (=) operation should
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* automagically re-encode the resulting value to take fractions into
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* consideration.
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* As all values are integers, some bit twiddling is in order:
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* BaudDivisor = (BaseClock / 16 / BaudRate) |
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* (((BaseClock / 2 / BaudRate) & 4) ? 0x4000 // 0.5
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* : ((BaseClock / 2 / BaudRate) & 2) ? 0x8000 // 0.25
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* : ((BaseClock / 2 / BaudRate) & 1) ? 0xc000 // 0.125
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* : 0)
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*
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* For the FT232BM, a 17th divisor bit was introduced to encode the multiples
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* of 0.125 missing from the FT8U232AM. Bits 16 to 14 are coded as follows
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* (the first four codes are the same as for the FT8U232AM, where bit 16 is
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* always 0):
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* 000 - add .000 to divisor
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* 001 - add .500 to divisor
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* 010 - add .250 to divisor
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* 011 - add .125 to divisor
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* 100 - add .375 to divisor
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* 101 - add .625 to divisor
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* 110 - add .750 to divisor
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* 111 - add .875 to divisor
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* Bits 15 to 0 of the 17-bit divisor are placed in the urb value. Bit 16 is
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* placed in bit 0 of the urb index.
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*
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* Note that there are a couple of special cases to support the highest baud
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* rates. If the calculated divisor value is 1, this needs to be replaced with
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* 0. Additionally for the FT232BM, if the calculated divisor value is 0x4001
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* (1.5), this needs to be replaced with 0x0001 (1) (but this divisor value is
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* not supported by the FT8U232AM).
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*/
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enum ftdi_chip_type {
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SIO = 1,
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FT8U232AM = 2,
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FT232BM = 3,
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FT2232C = 4,
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FT232RL = 5,
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FT2232H = 6,
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FT4232H = 7,
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FT232H = 8,
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FTX = 9,
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};
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enum ftdi_sio_baudrate {
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ftdi_sio_b300 = 0,
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ftdi_sio_b600 = 1,
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ftdi_sio_b1200 = 2,
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ftdi_sio_b2400 = 3,
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ftdi_sio_b4800 = 4,
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ftdi_sio_b9600 = 5,
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ftdi_sio_b19200 = 6,
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ftdi_sio_b38400 = 7,
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ftdi_sio_b57600 = 8,
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ftdi_sio_b115200 = 9
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};
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/*
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* The ftdi_8U232AM_xxMHz_byyy constants have been removed. The encoded divisor
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* values are calculated internally.
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*/
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#define FTDI_SIO_SET_DATA_REQUEST FTDI_SIO_SET_DATA
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#define FTDI_SIO_SET_DATA_REQUEST_TYPE 0x40
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#define FTDI_SIO_SET_DATA_PARITY_NONE (0x0 << 8)
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#define FTDI_SIO_SET_DATA_PARITY_ODD (0x1 << 8)
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#define FTDI_SIO_SET_DATA_PARITY_EVEN (0x2 << 8)
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#define FTDI_SIO_SET_DATA_PARITY_MARK (0x3 << 8)
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#define FTDI_SIO_SET_DATA_PARITY_SPACE (0x4 << 8)
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#define FTDI_SIO_SET_DATA_STOP_BITS_1 (0x0 << 11)
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#define FTDI_SIO_SET_DATA_STOP_BITS_15 (0x1 << 11)
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#define FTDI_SIO_SET_DATA_STOP_BITS_2 (0x2 << 11)
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#define FTDI_SIO_SET_BREAK (0x1 << 14)
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/* FTDI_SIO_SET_DATA */
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/*
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* BmRequestType: 0100 0000B
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* bRequest: FTDI_SIO_SET_DATA
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* wValue: Data characteristics (see below)
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* wIndex: Port
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* wLength: 0
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* Data: No
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*
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* Data characteristics
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*
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* B0..7 Number of data bits
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* B8..10 Parity
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* 0 = None
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* 1 = Odd
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* 2 = Even
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* 3 = Mark
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* 4 = Space
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* B11..13 Stop Bits
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* 0 = 1
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* 1 = 1.5
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* 2 = 2
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* B14
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* 1 = TX ON (break)
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* 0 = TX OFF (normal state)
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* B15 Reserved
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*
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*/
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/* FTDI_SIO_MODEM_CTRL */
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#define FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE 0x40
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#define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL
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/*
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* BmRequestType: 0100 0000B
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* bRequest: FTDI_SIO_MODEM_CTRL
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* wValue: ControlValue (see below)
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* wIndex: Port
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* wLength: 0
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* Data: None
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*
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* NOTE: If the device is in RTS/CTS flow control, the RTS set by this
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* command will be IGNORED without an error being returned
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* Also - you can not set DTR and RTS with one control message
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*/
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#define FTDI_SIO_SET_DTR_MASK 0x1
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#define FTDI_SIO_SET_DTR_HIGH ((FTDI_SIO_SET_DTR_MASK << 8) | 1)
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#define FTDI_SIO_SET_DTR_LOW ((FTDI_SIO_SET_DTR_MASK << 8) | 0)
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#define FTDI_SIO_SET_RTS_MASK 0x2
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#define FTDI_SIO_SET_RTS_HIGH ((FTDI_SIO_SET_RTS_MASK << 8) | 2)
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#define FTDI_SIO_SET_RTS_LOW ((FTDI_SIO_SET_RTS_MASK << 8) | 0)
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/*
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* ControlValue
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* B0 DTR state
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* 0 = reset
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* 1 = set
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* B1 RTS state
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* 0 = reset
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* 1 = set
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* B2..7 Reserved
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* B8 DTR state enable
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* 0 = ignore
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* 1 = use DTR state
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* B9 RTS state enable
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* 0 = ignore
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* 1 = use RTS state
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* B10..15 Reserved
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*/
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/* FTDI_SIO_SET_FLOW_CTRL */
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#define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0x40
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#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL
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#define FTDI_SIO_DISABLE_FLOW_CTRL 0x0
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#define FTDI_SIO_RTS_CTS_HS (0x1 << 8)
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#define FTDI_SIO_DTR_DSR_HS (0x2 << 8)
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#define FTDI_SIO_XON_XOFF_HS (0x4 << 8)
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/*
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* BmRequestType: 0100 0000b
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* bRequest: FTDI_SIO_SET_FLOW_CTRL
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* wValue: Xoff/Xon
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* wIndex: Protocol/Port - hIndex is protocol / lIndex is port
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* wLength: 0
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* Data: None
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*
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* hIndex protocol is:
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* B0 Output handshaking using RTS/CTS
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* 0 = disabled
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* 1 = enabled
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* B1 Output handshaking using DTR/DSR
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* 0 = disabled
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* 1 = enabled
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* B2 Xon/Xoff handshaking
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* 0 = disabled
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* 1 = enabled
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*
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* A value of zero in the hIndex field disables handshaking
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*
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* If Xon/Xoff handshaking is specified, the hValue field should contain the
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* XOFF character and the lValue field contains the XON character.
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*/
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/*
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* FTDI_SIO_GET_LATENCY_TIMER
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*
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* Set the timeout interval. The FTDI collects data from the slave
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* device, transmitting it to the host when either A) 62 bytes are
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* received, or B) the timeout interval has elapsed and the buffer
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* contains at least 1 byte. Setting this value to a small number
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* can dramatically improve performance for applications which send
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* small packets, since the default value is 16ms.
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*/
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#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER
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#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0xC0
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/*
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* BmRequestType: 1100 0000b
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* bRequest: FTDI_SIO_GET_LATENCY_TIMER
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* wValue: 0
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* wIndex: Port
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* wLength: 0
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* Data: latency (on return)
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*/
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/*
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* FTDI_SIO_SET_LATENCY_TIMER
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*
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* Set the timeout interval. The FTDI collects data from the slave
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* device, transmitting it to the host when either A) 62 bytes are
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* received, or B) the timeout interval has elapsed and the buffer
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* contains at least 1 byte. Setting this value to a small number
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* can dramatically improve performance for applications which send
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* small packets, since the default value is 16ms.
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*/
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#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER
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#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40
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/*
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* BmRequestType: 0100 0000b
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* bRequest: FTDI_SIO_SET_LATENCY_TIMER
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* wValue: Latency (milliseconds)
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* wIndex: Port
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* wLength: 0
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* Data: None
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*
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|
* wValue:
|
||
|
|
* B0..7 Latency timer
|
||
|
|
* B8..15 0
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* FTDI_SIO_SET_EVENT_CHAR
|
||
|
|
*
|
||
|
|
* Set the special event character for the specified communications port.
|
||
|
|
* If the device sees this character it will immediately return the
|
||
|
|
* data read so far - rather than wait 40ms or until 62 bytes are read
|
||
|
|
* which is what normally happens.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#define FTDI_SIO_SET_EVENT_CHAR_REQUEST FTDI_SIO_SET_EVENT_CHAR
|
||
|
|
#define FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE 0x40
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BmRequestType: 0100 0000b
|
||
|
|
* bRequest: FTDI_SIO_SET_EVENT_CHAR
|
||
|
|
* wValue: EventChar
|
||
|
|
* wIndex: Port
|
||
|
|
* wLength: 0
|
||
|
|
* Data: None
|
||
|
|
*
|
||
|
|
* wValue:
|
||
|
|
* B0..7 Event Character
|
||
|
|
* B8 Event Character Processing
|
||
|
|
* 0 = disabled
|
||
|
|
* 1 = enabled
|
||
|
|
* B9..15 Reserved
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* FTDI_SIO_SET_ERROR_CHAR */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set the parity error replacement character for the specified communications
|
||
|
|
* port
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BmRequestType: 0100 0000b
|
||
|
|
* bRequest: FTDI_SIO_SET_EVENT_CHAR
|
||
|
|
* wValue: Error Char
|
||
|
|
* wIndex: Port
|
||
|
|
* wLength: 0
|
||
|
|
* Data: None
|
||
|
|
*
|
||
|
|
*Error Char
|
||
|
|
* B0..7 Error Character
|
||
|
|
* B8 Error Character Processing
|
||
|
|
* 0 = disabled
|
||
|
|
* 1 = enabled
|
||
|
|
* B9..15 Reserved
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* FTDI_SIO_GET_MODEM_STATUS */
|
||
|
|
/* Retrieve the current value of the modem status register */
|
||
|
|
|
||
|
|
#define FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE 0xc0
|
||
|
|
#define FTDI_SIO_GET_MODEM_STATUS_REQUEST FTDI_SIO_GET_MODEM_STATUS
|
||
|
|
#define FTDI_SIO_CTS_MASK 0x10
|
||
|
|
#define FTDI_SIO_DSR_MASK 0x20
|
||
|
|
#define FTDI_SIO_RI_MASK 0x40
|
||
|
|
#define FTDI_SIO_RLSD_MASK 0x80
|
||
|
|
/*
|
||
|
|
* BmRequestType: 1100 0000b
|
||
|
|
* bRequest: FTDI_SIO_GET_MODEM_STATUS
|
||
|
|
* wValue: zero
|
||
|
|
* wIndex: Port
|
||
|
|
* wLength: 1
|
||
|
|
* Data: Status
|
||
|
|
*
|
||
|
|
* One byte of data is returned
|
||
|
|
* B0..3 0
|
||
|
|
* B4 CTS
|
||
|
|
* 0 = inactive
|
||
|
|
* 1 = active
|
||
|
|
* B5 DSR
|
||
|
|
* 0 = inactive
|
||
|
|
* 1 = active
|
||
|
|
* B6 Ring Indicator (RI)
|
||
|
|
* 0 = inactive
|
||
|
|
* 1 = active
|
||
|
|
* B7 Receive Line Signal Detect (RLSD)
|
||
|
|
* 0 = inactive
|
||
|
|
* 1 = active
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* Descriptors returned by the device
|
||
|
|
*
|
||
|
|
* Device Descriptor
|
||
|
|
*
|
||
|
|
* Offset Field Size Value Description
|
||
|
|
* 0 bLength 1 0x12 Size of descriptor in bytes
|
||
|
|
* 1 bDescriptorType 1 0x01 DEVICE Descriptor Type
|
||
|
|
* 2 bcdUSB 2 0x0110 USB Spec Release Number
|
||
|
|
* 4 bDeviceClass 1 0x00 Class Code
|
||
|
|
* 5 bDeviceSubClass 1 0x00 SubClass Code
|
||
|
|
* 6 bDeviceProtocol 1 0x00 Protocol Code
|
||
|
|
* 7 bMaxPacketSize0 1 0x08 Maximum packet size for endpoint 0
|
||
|
|
* 8 idVendor 2 0x0403 Vendor ID
|
||
|
|
* 10 idProduct 2 0x8372 Product ID (FTDI_SIO_PID)
|
||
|
|
* 12 bcdDevice 2 0x0001 Device release number
|
||
|
|
* 14 iManufacturer 1 0x01 Index of man. string desc
|
||
|
|
* 15 iProduct 1 0x02 Index of prod string desc
|
||
|
|
* 16 iSerialNumber 1 0x02 Index of serial nmr string desc
|
||
|
|
* 17 bNumConfigurations 1 0x01 Number of possible configurations
|
||
|
|
*
|
||
|
|
* Configuration Descriptor
|
||
|
|
*
|
||
|
|
* Offset Field Size Value
|
||
|
|
* 0 bLength 1 0x09 Size of descriptor in bytes
|
||
|
|
* 1 bDescriptorType 1 0x02 CONFIGURATION Descriptor Type
|
||
|
|
* 2 wTotalLength 2 0x0020 Total length of data
|
||
|
|
* 4 bNumInterfaces 1 0x01 Number of interfaces supported
|
||
|
|
* 5 bConfigurationValue 1 0x01 Argument for SetCOnfiguration() req
|
||
|
|
* 6 iConfiguration 1 0x02 Index of config string descriptor
|
||
|
|
* 7 bmAttributes 1 0x20 Config characteristics Remote Wakeup
|
||
|
|
* 8 MaxPower 1 0x1E Max power consumption
|
||
|
|
*
|
||
|
|
* Interface Descriptor
|
||
|
|
*
|
||
|
|
* Offset Field Size Value
|
||
|
|
* 0 bLength 1 0x09 Size of descriptor in bytes
|
||
|
|
* 1 bDescriptorType 1 0x04 INTERFACE Descriptor Type
|
||
|
|
* 2 bInterfaceNumber 1 0x00 Number of interface
|
||
|
|
* 3 bAlternateSetting 1 0x00 Value used to select alternate
|
||
|
|
* 4 bNumEndpoints 1 0x02 Number of endpoints
|
||
|
|
* 5 bInterfaceClass 1 0xFF Class Code
|
||
|
|
* 6 bInterfaceSubClass 1 0xFF Subclass Code
|
||
|
|
* 7 bInterfaceProtocol 1 0xFF Protocol Code
|
||
|
|
* 8 iInterface 1 0x02 Index of interface string description
|
||
|
|
*
|
||
|
|
* IN Endpoint Descriptor
|
||
|
|
*
|
||
|
|
* Offset Field Size Value
|
||
|
|
* 0 bLength 1 0x07 Size of descriptor in bytes
|
||
|
|
* 1 bDescriptorType 1 0x05 ENDPOINT descriptor type
|
||
|
|
* 2 bEndpointAddress 1 0x82 Address of endpoint
|
||
|
|
* 3 bmAttributes 1 0x02 Endpoint attributes - Bulk
|
||
|
|
* 4 bNumEndpoints 2 0x0040 maximum packet size
|
||
|
|
* 5 bInterval 1 0x00 Interval for polling endpoint
|
||
|
|
*
|
||
|
|
* OUT Endpoint Descriptor
|
||
|
|
*
|
||
|
|
* Offset Field Size Value
|
||
|
|
* 0 bLength 1 0x07 Size of descriptor in bytes
|
||
|
|
* 1 bDescriptorType 1 0x05 ENDPOINT descriptor type
|
||
|
|
* 2 bEndpointAddress 1 0x02 Address of endpoint
|
||
|
|
* 3 bmAttributes 1 0x02 Endpoint attributes - Bulk
|
||
|
|
* 4 bNumEndpoints 2 0x0040 maximum packet size
|
||
|
|
* 5 bInterval 1 0x00 Interval for polling endpoint
|
||
|
|
*
|
||
|
|
* DATA FORMAT
|
||
|
|
*
|
||
|
|
* IN Endpoint
|
||
|
|
*
|
||
|
|
* The device reserves the first two bytes of data on this endpoint to contain
|
||
|
|
* the current values of the modem and line status registers. In the absence of
|
||
|
|
* data, the device generates a message consisting of these two status bytes
|
||
|
|
* every 40 ms
|
||
|
|
*
|
||
|
|
* Byte 0: Modem Status
|
||
|
|
*
|
||
|
|
* Offset Description
|
||
|
|
* B0 Reserved - must be 1
|
||
|
|
* B1 Reserved - must be 0
|
||
|
|
* B2 Reserved - must be 0
|
||
|
|
* B3 Reserved - must be 0
|
||
|
|
* B4 Clear to Send (CTS)
|
||
|
|
* B5 Data Set Ready (DSR)
|
||
|
|
* B6 Ring Indicator (RI)
|
||
|
|
* B7 Receive Line Signal Detect (RLSD)
|
||
|
|
*
|
||
|
|
* Byte 1: Line Status
|
||
|
|
*
|
||
|
|
* Offset Description
|
||
|
|
* B0 Data Ready (DR)
|
||
|
|
* B1 Overrun Error (OE)
|
||
|
|
* B2 Parity Error (PE)
|
||
|
|
* B3 Framing Error (FE)
|
||
|
|
* B4 Break Interrupt (BI)
|
||
|
|
* B5 Transmitter Holding Register (THRE)
|
||
|
|
* B6 Transmitter Empty (TEMT)
|
||
|
|
* B7 Error in RCVR FIFO
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#define FTDI_RS0_CTS (1 << 4)
|
||
|
|
#define FTDI_RS0_DSR (1 << 5)
|
||
|
|
#define FTDI_RS0_RI (1 << 6)
|
||
|
|
#define FTDI_RS0_RLSD (1 << 7)
|
||
|
|
|
||
|
|
#define FTDI_RS_DR 1
|
||
|
|
#define FTDI_RS_OE (1<<1)
|
||
|
|
#define FTDI_RS_PE (1<<2)
|
||
|
|
#define FTDI_RS_FE (1<<3)
|
||
|
|
#define FTDI_RS_BI (1<<4)
|
||
|
|
#define FTDI_RS_THRE (1<<5)
|
||
|
|
#define FTDI_RS_TEMT (1<<6)
|
||
|
|
#define FTDI_RS_FIFO (1<<7)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* OUT Endpoint
|
||
|
|
*
|
||
|
|
* This device reserves the first bytes of data on this endpoint contain the
|
||
|
|
* length and port identifier of the message. For the FTDI USB Serial converter
|
||
|
|
* the port identifier is always 1.
|
||
|
|
*
|
||
|
|
* Byte 0: Line Status
|
||
|
|
*
|
||
|
|
* Offset Description
|
||
|
|
* B0 Reserved - must be 1
|
||
|
|
* B1 Reserved - must be 0
|
||
|
|
* B2..7 Length of message - (not including Byte 0)
|
||
|
|
*
|
||
|
|
*/
|