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#lang racket/base
(require
racket/bool
racket/function
xml
"xexpr-path/main.rkt"
"layer2.rkt")
(define logger (make-logger 'ebus-layer7 (current-logger)))
(current-logger logger)
(define definition
(parameterize ([collapse-whitespace #t]
[xexpr-drop-empty-attributes #t])
(xml->xexpr (document-element (read-xml (open-input-file "../ebus-xml/ebus.xml"))))))
(define (paket ebus-paket)
(define primaryCommand (number->string (layer2-ebus-paket-primaryCommand ebus-paket)))
(define secondaryCommand (number->string (layer2-ebus-paket-secondaryCommand ebus-paket)))
(log-debug "Lookup paket primaryCommand=~a secondaryCommand=~a" primaryCommand secondaryCommand)
(xexpr-path-first (list 'packets 'packet (list 'primary primaryCommand)
(list 'secondary secondaryCommand)) definition))
(define (paket-name xexpr)
(xexpr-path-first '((name)) xexpr))
(define (paket-fields paket-definition)
(filter
(lambda (i) (and (pair? i) (member (car i) '(bit bcd data1b data1c byte data2b data2c word byteEnum))))
(xexpr-path-list '(fields *) paket-definition)))
;; returns the full device-definition
(define (device address)
(xexpr-path-first (list 'devices 'device (list 'address (number->string address))) definition))
;; returns device-name in a list or empty-list
(define (device-name address)
(xexpr-path-first (list 'devices 'device (list 'address (number->string address)) '(name)) definition))
(define (paket-parse ebus-paket)
(define paket-definition (paket ebus-paket))
(define source-device-name (device-name (layer2-ebus-paket-source ebus-paket)))
(cond ((and (not (false? paket-definition)) (not (false? source-device-name)))
(define paket-id (string-append source-device-name "." (paket-name paket-definition)))
(define decoders (map (lambda (field) (create-decoder paket-id field)) (paket-fields paket-definition)))
(define payload (layer2-ebus-paket-payload ebus-paket))
(for/list ([decoder decoders])
(decoder payload)))
(else (void (log-info "Unknown Paket from source ~s(~s): ~s"
(layer2-ebus-paket-source ebus-paket)
source-device-name
ebus-paket)))))
(define (create-decoder paket-id field)
(define type (car field))
(define name (string-append paket-id "." (xexpr-path-first '((name)) field)))
(define offset (string->number (xexpr-path-first '((offset)) field)))
(define decoder (hash-ref decoder-table type #f))
(cond ((false? decoder) (void (log-warning "No decoder for type ~s" type)))
(else (curry (car decoder) name field offset))))
(define decoder-table
(make-hash (list
(list 'bit (lambda (name field offset payload)
(list name 'bit (field-decoder-bit (list-ref payload offset)))))
(list 'bcd (lambda (name field offset payload)
(list name 'bcd (field-decoder-bcd (list-ref payload offset)))))
(list 'data1b (lambda (name field offset payload)
(list name 'data1b (field-decoder-data1b (list-ref payload offset)))))
(list 'data1c (lambda (name field offset payload)
(list name 'data1b (field-decoder-data1c (list-ref payload offset)))))
(list 'byte (lambda (name field offset payload)
(list name 'byte offset (list-ref payload offset))))
(list 'data2b (lambda (name field offset payload)
(list name 'data2b (field-decoder-data2b
(list-ref payload offset)
(list-ref payload (+ offset 1))))))
(list 'data2c (lambda (name field offset payload)
(list name 'data2c offset
(field-decoder-data2c (list-ref payload offset) (list-ref payload (+ offset 1))))))
(list 'word (lambda (name field offset payload)
(list name 'word (field-decoder-word (list-ref payload offset) (list-ref payload (+ offset 1))))))
(list 'byteEnum (lambda (name field offset payload)
(list name 'byteEnum (field-decoder-byteEnum (list-ref payload offset) field))))
)))
;; type bit
(define (field-decoder-bit value)
(cond ((= value 1) 1)
(else 0)))
;; type data1b
(define (field-decoder-data1b value)
value)
;; type data1c
(define (field-decoder-data1c value)
(/ value 2.0))
;; type data2b
(define (field-decoder-data2b lowByte highByte)
(if (= (bitwise-and highByte 128) 128)
(* -1
(+ (+ 256 (bitwise-not highByte))
(/ (+ 256 (bitwise-not (+ lowByte 1))) 256.0)))
(+ highByte (/ lowByte 256.0))))
;; type data2c
;; Beispiel für die Berechnung:
;; if ((x & 8000h) == 8000h) // y negativ
;; y = - [dez(High_Byte(!x)) 16 + dez(High_Nibble (Low_Byte (!x)))
;; + (dez(Low_Nibble (Low_Byte (!x))) +1 ) / 16]
;; else // y positiv
;; y = dez(High_Byte(x)) 16 + dez(High_ Nibble (Low Byte (x)))
;; + dez(Low_ Nibble (Low Byte (x))) / 16
(define (field-decoder-data2c lowByte highByte)
(define (lowNibble v)
(bitwise-and v #x0f))
(define (highNibble v)
(arithmetic-shift v -4))
(define (u-not v)
(+ 256 (bitwise-not v)))
(if (= (bitwise-and highByte 128) 128)
(* -1
(+ (arithmetic-shift (u-not highByte) 4)
(highNibble (u-not lowByte))
(/ (+ (lowNibble (u-not lowByte)) 1)
16.0)))
(+ (arithmetic-shift highByte 4)
(highNibble lowByte)
(/
(lowNibble lowByte)
16))))
;; type byteEnum
(define (field-decoder-byteEnum value field-definition)
(define (pred l)
(= value (list-ref l 0)))
(define all-options (for/list ([option (xexpr-path-list '(option) field-definition)])
(list (string->number (xexpr-path-first '((value)) option)) ;; '(value name)
(xexpr-path-first '((name)) option))))
(define options (filter pred all-options))
(cond ((= (length options) 1)
(list-ref (car options) 1))
(else (format "<undefined:~a>" value))))
;; type word
(define (field-decoder-word lowByte highByte)
(+ lowByte
(arithmetic-shift highByte 8)))
;; type bcd
(define (field-decoder-bcd value)
(+ (bitwise-and value #x0f)
(arithmetic-shift value -4)))
;; read one ebus-paket or eof from input-port
;; or return #<eof>
(define (read-ebus input-port)
(define paket (layer2-read-ebus input-port))
(cond ((layer2-ebus-paket? paket)
(paket-parse paket))
(else paket)))
(provide (prefix-out layer7- paket)
(prefix-out layer7- paket-parse)
(prefix-out layer7- device)
(prefix-out layer7- device-name)
(prefix-out layer7- definition)
;; read ebus from port an return fields from next paket
(prefix-out layer7- read-ebus)
(prefix-out layer7- logger))
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