563 lines
17 KiB
C
563 lines
17 KiB
C
/*
|
|
* Driver definitions for the FTDI USB Single Port Serial Converter -
|
|
* known as FTDI_SIO (Serial Input/Output application of the chipset)
|
|
*
|
|
* For USB vendor/product IDs (VID/PID), please see ftdi_sio_ids.h
|
|
*
|
|
*
|
|
* The example I have is known as the USC-1000 which is available from
|
|
* http://www.dse.co.nz - cat no XH4214 It looks similar to this:
|
|
* http://www.dansdata.com/usbser.htm but I can't be sure There are other
|
|
* USC-1000s which don't look like my device though so beware!
|
|
*
|
|
* The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side,
|
|
* USB on the other.
|
|
*
|
|
* Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details
|
|
* of the protocol required to talk to the device and ongoing assistence
|
|
* during development.
|
|
*
|
|
* Bill Ryder - bryder@sgi.com formerly of Silicon Graphics, Inc.- wrote the
|
|
* FTDI_SIO implementation.
|
|
*
|
|
*/
|
|
|
|
/* Commands */
|
|
#define FTDI_SIO_RESET 0 /* Reset the port */
|
|
#define FTDI_SIO_MODEM_CTRL 1 /* Set the modem control register */
|
|
#define FTDI_SIO_SET_FLOW_CTRL 2 /* Set flow control register */
|
|
#define FTDI_SIO_SET_BAUD_RATE 3 /* Set baud rate */
|
|
#define FTDI_SIO_SET_DATA 4 /* Set the data characteristics of
|
|
the port */
|
|
#define FTDI_SIO_GET_MODEM_STATUS 5 /* Retrieve current value of modem
|
|
status register */
|
|
#define FTDI_SIO_SET_EVENT_CHAR 6 /* Set the event character */
|
|
#define FTDI_SIO_SET_ERROR_CHAR 7 /* Set the error character */
|
|
#define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */
|
|
#define FTDI_SIO_GET_LATENCY_TIMER 10 /* Get the latency timer */
|
|
|
|
/* Interface indices for FT2232, FT2232H and FT4232H devices */
|
|
#define INTERFACE_A 1
|
|
#define INTERFACE_B 2
|
|
#define INTERFACE_C 3
|
|
#define INTERFACE_D 4
|
|
|
|
|
|
/*
|
|
* BmRequestType: 1100 0000b
|
|
* bRequest: FTDI_E2_READ
|
|
* wValue: 0
|
|
* wIndex: Address of word to read
|
|
* wLength: 2
|
|
* Data: Will return a word of data from E2Address
|
|
*
|
|
*/
|
|
|
|
/* Port Identifier Table */
|
|
#define PIT_DEFAULT 0 /* SIOA */
|
|
#define PIT_SIOA 1 /* SIOA */
|
|
/* The device this driver is tested with one has only one port */
|
|
#define PIT_SIOB 2 /* SIOB */
|
|
#define PIT_PARALLEL 3 /* Parallel */
|
|
|
|
/* FTDI_SIO_RESET */
|
|
#define FTDI_SIO_RESET_REQUEST FTDI_SIO_RESET
|
|
#define FTDI_SIO_RESET_REQUEST_TYPE 0x40
|
|
#define FTDI_SIO_RESET_SIO 0
|
|
#define FTDI_SIO_RESET_PURGE_RX 1
|
|
#define FTDI_SIO_RESET_PURGE_TX 2
|
|
|
|
/*
|
|
* BmRequestType: 0100 0000B
|
|
* bRequest: FTDI_SIO_RESET
|
|
* wValue: Control Value
|
|
* 0 = Reset SIO
|
|
* 1 = Purge RX buffer
|
|
* 2 = Purge TX buffer
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: None
|
|
*
|
|
* The Reset SIO command has this effect:
|
|
*
|
|
* Sets flow control set to 'none'
|
|
* Event char = $0D
|
|
* Event trigger = disabled
|
|
* Purge RX buffer
|
|
* Purge TX buffer
|
|
* Clear DTR
|
|
* Clear RTS
|
|
* baud and data format not reset
|
|
*
|
|
* The Purge RX and TX buffer commands affect nothing except the buffers
|
|
*
|
|
*/
|
|
|
|
/* FTDI_SIO_SET_BAUDRATE */
|
|
#define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0x40
|
|
#define FTDI_SIO_SET_BAUDRATE_REQUEST 3
|
|
|
|
/*
|
|
* BmRequestType: 0100 0000B
|
|
* bRequest: FTDI_SIO_SET_BAUDRATE
|
|
* wValue: BaudDivisor value - see below
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: None
|
|
* The BaudDivisor values are calculated as follows:
|
|
* - BaseClock is either 12000000 or 48000000 depending on the device.
|
|
* FIXME: I wish I knew how to detect old chips to select proper base clock!
|
|
* - BaudDivisor is a fixed point number encoded in a funny way.
|
|
* (--WRONG WAY OF THINKING--)
|
|
* BaudDivisor is a fixed point number encoded with following bit weighs:
|
|
* (-2)(-1)(13..0). It is a radical with a denominator of 4, so values
|
|
* end with 0.0 (00...), 0.25 (10...), 0.5 (01...), and 0.75 (11...).
|
|
* (--THE REALITY--)
|
|
* The both-bits-set has quite different meaning from 0.75 - the chip
|
|
* designers have decided it to mean 0.125 instead of 0.75.
|
|
* This info looked up in FTDI application note "FT8U232 DEVICES \ Data Rates
|
|
* and Flow Control Consideration for USB to RS232".
|
|
* - BaudDivisor = (BaseClock / 16) / BaudRate, where the (=) operation should
|
|
* automagically re-encode the resulting value to take fractions into
|
|
* consideration.
|
|
* As all values are integers, some bit twiddling is in order:
|
|
* BaudDivisor = (BaseClock / 16 / BaudRate) |
|
|
* (((BaseClock / 2 / BaudRate) & 4) ? 0x4000 // 0.5
|
|
* : ((BaseClock / 2 / BaudRate) & 2) ? 0x8000 // 0.25
|
|
* : ((BaseClock / 2 / BaudRate) & 1) ? 0xc000 // 0.125
|
|
* : 0)
|
|
*
|
|
* For the FT232BM, a 17th divisor bit was introduced to encode the multiples
|
|
* of 0.125 missing from the FT8U232AM. Bits 16 to 14 are coded as follows
|
|
* (the first four codes are the same as for the FT8U232AM, where bit 16 is
|
|
* always 0):
|
|
* 000 - add .000 to divisor
|
|
* 001 - add .500 to divisor
|
|
* 010 - add .250 to divisor
|
|
* 011 - add .125 to divisor
|
|
* 100 - add .375 to divisor
|
|
* 101 - add .625 to divisor
|
|
* 110 - add .750 to divisor
|
|
* 111 - add .875 to divisor
|
|
* Bits 15 to 0 of the 17-bit divisor are placed in the urb value. Bit 16 is
|
|
* placed in bit 0 of the urb index.
|
|
*
|
|
* Note that there are a couple of special cases to support the highest baud
|
|
* rates. If the calculated divisor value is 1, this needs to be replaced with
|
|
* 0. Additionally for the FT232BM, if the calculated divisor value is 0x4001
|
|
* (1.5), this needs to be replaced with 0x0001 (1) (but this divisor value is
|
|
* not supported by the FT8U232AM).
|
|
*/
|
|
|
|
enum ftdi_chip_type {
|
|
SIO = 1,
|
|
FT8U232AM = 2,
|
|
FT232BM = 3,
|
|
FT2232C = 4,
|
|
FT232RL = 5,
|
|
FT2232H = 6,
|
|
FT4232H = 7
|
|
};
|
|
|
|
enum ftdi_sio_baudrate {
|
|
ftdi_sio_b300 = 0,
|
|
ftdi_sio_b600 = 1,
|
|
ftdi_sio_b1200 = 2,
|
|
ftdi_sio_b2400 = 3,
|
|
ftdi_sio_b4800 = 4,
|
|
ftdi_sio_b9600 = 5,
|
|
ftdi_sio_b19200 = 6,
|
|
ftdi_sio_b38400 = 7,
|
|
ftdi_sio_b57600 = 8,
|
|
ftdi_sio_b115200 = 9
|
|
};
|
|
|
|
/*
|
|
* The ftdi_8U232AM_xxMHz_byyy constants have been removed. The encoded divisor
|
|
* values are calculated internally.
|
|
*/
|
|
#define FTDI_SIO_SET_DATA_REQUEST FTDI_SIO_SET_DATA
|
|
#define FTDI_SIO_SET_DATA_REQUEST_TYPE 0x40
|
|
#define FTDI_SIO_SET_DATA_PARITY_NONE (0x0 << 8)
|
|
#define FTDI_SIO_SET_DATA_PARITY_ODD (0x1 << 8)
|
|
#define FTDI_SIO_SET_DATA_PARITY_EVEN (0x2 << 8)
|
|
#define FTDI_SIO_SET_DATA_PARITY_MARK (0x3 << 8)
|
|
#define FTDI_SIO_SET_DATA_PARITY_SPACE (0x4 << 8)
|
|
#define FTDI_SIO_SET_DATA_STOP_BITS_1 (0x0 << 11)
|
|
#define FTDI_SIO_SET_DATA_STOP_BITS_15 (0x1 << 11)
|
|
#define FTDI_SIO_SET_DATA_STOP_BITS_2 (0x2 << 11)
|
|
#define FTDI_SIO_SET_BREAK (0x1 << 14)
|
|
/* FTDI_SIO_SET_DATA */
|
|
|
|
/*
|
|
* BmRequestType: 0100 0000B
|
|
* bRequest: FTDI_SIO_SET_DATA
|
|
* wValue: Data characteristics (see below)
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: No
|
|
*
|
|
* Data characteristics
|
|
*
|
|
* B0..7 Number of data bits
|
|
* B8..10 Parity
|
|
* 0 = None
|
|
* 1 = Odd
|
|
* 2 = Even
|
|
* 3 = Mark
|
|
* 4 = Space
|
|
* B11..13 Stop Bits
|
|
* 0 = 1
|
|
* 1 = 1.5
|
|
* 2 = 2
|
|
* B14
|
|
* 1 = TX ON (break)
|
|
* 0 = TX OFF (normal state)
|
|
* B15 Reserved
|
|
*
|
|
*/
|
|
|
|
|
|
|
|
/* FTDI_SIO_MODEM_CTRL */
|
|
#define FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE 0x40
|
|
#define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL
|
|
|
|
/*
|
|
* BmRequestType: 0100 0000B
|
|
* bRequest: FTDI_SIO_MODEM_CTRL
|
|
* wValue: ControlValue (see below)
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: None
|
|
*
|
|
* NOTE: If the device is in RTS/CTS flow control, the RTS set by this
|
|
* command will be IGNORED without an error being returned
|
|
* Also - you can not set DTR and RTS with one control message
|
|
*/
|
|
|
|
#define FTDI_SIO_SET_DTR_MASK 0x1
|
|
#define FTDI_SIO_SET_DTR_HIGH (1 | (FTDI_SIO_SET_DTR_MASK << 8))
|
|
#define FTDI_SIO_SET_DTR_LOW (0 | (FTDI_SIO_SET_DTR_MASK << 8))
|
|
#define FTDI_SIO_SET_RTS_MASK 0x2
|
|
#define FTDI_SIO_SET_RTS_HIGH (2 | (FTDI_SIO_SET_RTS_MASK << 8))
|
|
#define FTDI_SIO_SET_RTS_LOW (0 | (FTDI_SIO_SET_RTS_MASK << 8))
|
|
|
|
/*
|
|
* ControlValue
|
|
* B0 DTR state
|
|
* 0 = reset
|
|
* 1 = set
|
|
* B1 RTS state
|
|
* 0 = reset
|
|
* 1 = set
|
|
* B2..7 Reserved
|
|
* B8 DTR state enable
|
|
* 0 = ignore
|
|
* 1 = use DTR state
|
|
* B9 RTS state enable
|
|
* 0 = ignore
|
|
* 1 = use RTS state
|
|
* B10..15 Reserved
|
|
*/
|
|
|
|
/* FTDI_SIO_SET_FLOW_CTRL */
|
|
#define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0x40
|
|
#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL
|
|
#define FTDI_SIO_DISABLE_FLOW_CTRL 0x0
|
|
#define FTDI_SIO_RTS_CTS_HS (0x1 << 8)
|
|
#define FTDI_SIO_DTR_DSR_HS (0x2 << 8)
|
|
#define FTDI_SIO_XON_XOFF_HS (0x4 << 8)
|
|
/*
|
|
* BmRequestType: 0100 0000b
|
|
* bRequest: FTDI_SIO_SET_FLOW_CTRL
|
|
* wValue: Xoff/Xon
|
|
* wIndex: Protocol/Port - hIndex is protocol / lIndex is port
|
|
* wLength: 0
|
|
* Data: None
|
|
*
|
|
* hIndex protocol is:
|
|
* B0 Output handshaking using RTS/CTS
|
|
* 0 = disabled
|
|
* 1 = enabled
|
|
* B1 Output handshaking using DTR/DSR
|
|
* 0 = disabled
|
|
* 1 = enabled
|
|
* B2 Xon/Xoff handshaking
|
|
* 0 = disabled
|
|
* 1 = enabled
|
|
*
|
|
* A value of zero in the hIndex field disables handshaking
|
|
*
|
|
* If Xon/Xoff handshaking is specified, the hValue field should contain the
|
|
* XOFF character and the lValue field contains the XON character.
|
|
*/
|
|
|
|
/*
|
|
* FTDI_SIO_GET_LATENCY_TIMER
|
|
*
|
|
* Set the timeout interval. The FTDI collects data from the slave
|
|
* device, transmitting it to the host when either A) 62 bytes are
|
|
* received, or B) the timeout interval has elapsed and the buffer
|
|
* contains at least 1 byte. Setting this value to a small number
|
|
* can dramatically improve performance for applications which send
|
|
* small packets, since the default value is 16ms.
|
|
*/
|
|
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER
|
|
#define FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0xC0
|
|
|
|
/*
|
|
* BmRequestType: 1100 0000b
|
|
* bRequest: FTDI_SIO_GET_LATENCY_TIMER
|
|
* wValue: 0
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: latency (on return)
|
|
*/
|
|
|
|
/*
|
|
* FTDI_SIO_SET_LATENCY_TIMER
|
|
*
|
|
* Set the timeout interval. The FTDI collects data from the slave
|
|
* device, transmitting it to the host when either A) 62 bytes are
|
|
* received, or B) the timeout interval has elapsed and the buffer
|
|
* contains at least 1 byte. Setting this value to a small number
|
|
* can dramatically improve performance for applications which send
|
|
* small packets, since the default value is 16ms.
|
|
*/
|
|
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER
|
|
#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40
|
|
|
|
/*
|
|
* BmRequestType: 0100 0000b
|
|
* bRequest: FTDI_SIO_SET_LATENCY_TIMER
|
|
* wValue: Latency (milliseconds)
|
|
* wIndex: Port
|
|
* wLength: 0
|
|
* Data: None
|
|
*
|
|
* 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)
|
|
*
|
|
*/
|