456 lines
39 KiB
Plaintext
456 lines
39 KiB
Plaintext
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{{
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┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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│ Communications Engine │
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│ │
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│ Author: Kwabena W. Agyeman │
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│ Updated: 8/4/2009 │
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│ Designed For: P8X32A │
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│ │
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│ Copyright (c) 2009 Kwabena W. Agyeman │
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│ See end of file for terms of use. │
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│ │
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│ Driver Info: │
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│ │
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│ The COMEngine runs a COM driver in the next free cog on the propeller chip when called. │
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│ │
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│ The driver, is only guaranteed and tested to work at an 80Mhz system clock or higher. The driver is designed for the P8X32A │
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│ so port B will not be operational. │
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│ │
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│ Nyamekye, │
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└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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}}
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CON
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''
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RX_Pin = 31 '' ── RX Line - This line is driven by the interface chip.
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''
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TX_Pin = 30 '' ── TX Line - This line is driven by the propeller chip.
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Stop_Bits = 1
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CON
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' For use with "receiveCharacter", "receiveCheck", "transmitCharacter", "transmitCharacters"
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#0, Null
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#1, Start_Of_Heading, Start_Of_Text, End_Of_Text, End_Of_Transmission
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#5, Enquiry, Acknowledge
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#7, Bell, Backspace, Horizontal_Tab, Line_Feed, Vertical_Tab, Form_Feed, Carriage_Return
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#14, Shift_Out, Shift_In, Data_Link_Escape
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#17, Device_Control_1, Device_Control_2, Device_Control_3, Device_Control_4
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#21, Negative_Aknowledge, Synchronous_Idle, End_Of_Transmission_Block, Cancel, End_Of_Medium, Substitute, Escapse
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#28, File_Seperaor, Group_Seperator, Record_Seperator, Unit_Seperator
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#127, Delete
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#17, XON, #19, XOFF
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VAR
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long baudRate
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byte inputHead
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byte inputTail
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byte outputHead
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byte outputTail
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byte inputBuffer[256]
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byte outputBuffer[256]
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PUB generateEvenParity(character) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Generates an even parity for a character and returns that character with the new parity attached. │
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'' │ │
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'' │ Character - A character. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (character ^ evenOrOdd(character))
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PUB generateOddParity(character) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Generates an odd parity for a character and returns that character with the new parity attached. │
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'' │ │
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'' │ Character - A character. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (character ^ evenOrOdd(character) ^ $80)
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PUB generateMarkParity(character) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Generates an mark parity for a character and returns that character with the new parity attached. │
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'' │ │
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'' │ Character - A character. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (character | $80)
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PUB generateSpaceParity(character) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Generates an space parity for a character and returns that character with the new parity attached. │ │
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'' │ │
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'' │ Character - A character. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (character & $7F)
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PUB checkEvenParity(character) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns true if the parity is correct and false if it is not. │
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'' │ │
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'' │ Character - A character with an even parity. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (not(evenOrOdd(character)))
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PUB checkOddParity(character) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns true if the parity is correct and false if it is not. │
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'' │ │
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'' │ Character - A character with an odd parity. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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result or= evenOrOdd(character)
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PUB checkMarkParity(character) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns true if the parity is correct and false if it is not. │
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'' │ │
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'' │ Character - A character with an mark parity. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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result or= (character & $80)
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PUB checkSpaceParity(character) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns true if the parity is correct and false if it is not. │
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'' │ │
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'' │ Character - A character with an space parity. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (not(character & $80))
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PUB receiveCharacter '' 6 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns the next character in the receiver buffer. │
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'' │ │
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'' │ Waits until there is a character to return if the receiver buffer is empty. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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repeat until(receiveNumber)
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return inputBuffer[inputTail++]
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PUB receiveNumber '' 3 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns the number of characters in the receiver buffer. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return ((inputHead - inputTail) & $FF)
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PUB receiveCheck(character) '' 7 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Compares the last character in the receiver buffer with the specified character for equality. │
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'' │ │
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'' │ Returns true if they are equal and false otherwise. │
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'' │ │
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'' │ Character - The character to compare the last received character with for equality. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (receiveNumber and (inputBuffer[(inputHead - 1) & $FF] == character))
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PUB receiveFull '' 6 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Returns true if the receiver buffer is full and false if it is not. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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return (receiveNumber == 255)
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PUB receiveFlush '' 3 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Empties the receiver buffer. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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inputTail := inputHead
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PUB transmitCharacter(character) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Transmits a character at the speed of the currently specified baud rate. │
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'' │ │
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'' │ Character - A character to transmit. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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repeat until(outputTail <> ((outputHead + 1) & $FF))
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outputBuffer[outputHead++] := character
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PUB transmitCharacters(characters) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Transmits a string characters at the speed of the currently specified baud rate. │
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'' │ │
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'' │ Characters - A pointer to the string of characters to transmit. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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repeat strsize(characters)
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transmitCharacter(byte[characters++])
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PUB changeBaudRate(newBaudRate) '' 4 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Changes the current baud rate. │
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'' │ │
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'' │ NewBaudRate - The new baud rate to transmit and receive at. Between 1 BPS and 250000 BPS. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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repeat while(outputHead <> outputTail)
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if(baudRate)
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waitcnt((baudRate * constant((((Stop_Bits <# 32) #> 1) + 8) * 4)) + cnt)
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baudRate := ((clkfreq / ((newBaudRate <# 250000) #> 1)) >> 2)
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PUB COMEngine(newBaudRate) '' 8 Stack Longs
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'' ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
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'' │ Initializes the COM driver to run on a new cog. │
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'' │ │
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'' │ Returns the new cog's ID on sucess or -1 on failure. │
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'' │ │
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'' │ NewBaudRate - The new baud rate to transmit and receive at. Between 1 BPS and 250000 BPS. │
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'' └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
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inputHeadAddress := @inputHead
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inputTailAddress := @inputTail
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outputHeadAddress := @outputHead
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outputTailAddress := @outputTail
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inputBufferAddress := @inputBuffer
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outputBufferAddress := @outputBuffer
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changeBaudRate(newBaudRate)
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return cognew(@initialization, @baudRate)
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PRI evenOrOdd(character) ' 4 Stack Longs
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repeat 8
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result += (character & 1)
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character >>= 1
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return ((result & 1) << 7)
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DAT
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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' COM Driver
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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org
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' //////////////////////Initialization/////////////////////////////////////////////////////////////////////////////////////////
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initialization mov transmitterPC, #transmitter ' Setup transmitter.
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movi ctra, #%0_00100_000 '
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movs ctra, #((TX_Pin <# 31) #> 0) '
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neg phsa, #1 '
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mov dira, TXPin '
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rdlong counter, par ' Setup synchronization.
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add counter, cnt '
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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' Receiver
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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receiver rdlong quarterRate, par ' Get new settings.
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add counter, quarterRate '
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waitcnt counter, quarterRate ' Wait for transmitter.
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jmpret receiverPC, transmitterPC '
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waitcnt counter, quarterRate ' Wait for start bit.
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test RXPin, ina wz '
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if_nz waitcnt counter, quarterRate ' Wait for start bit.
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if_nz test RXPin, ina wc '
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if_nz_and_c jmp #receiver ' Repeat.
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' //////////////////////Receiver Setup/////////////////////////////////////////////////////////////////////////////////////////
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mov receiverCounter, #9 ' Setup loop to receive the packet.
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' //////////////////////Receive Packet/////////////////////////////////////////////////////////////////////////////////////////
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receive waitcnt counter, quarterRate ' Input bits.
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test RXPin, ina wc '
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rcl receiverBuffer, #1 '
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if_z add counter, quarterRate ' Wait for transmitter.
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waitcnt counter, quarterRate '
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jmpret receiverPC, transmitterPC '
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if_nz add counter, quarterRate '
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waitcnt counter, quarterRate '
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djnz receiverCounter, #receive ' Ready next bit.
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rev receiverBuffer, #24 ' Reverse backwards bits.
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' //////////////////////Update Packet//////////////////////////////////////////////////////////////////////////////////////////
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rdbyte receiverTail, inputTailAddress ' Check if the buffer is full.
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mov buffer, receiverHead '
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sub buffer, receiverTail '
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and buffer, #$FF '
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cmp buffer, #255 wc '
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' //////////////////////Set Packet/////////////////////////////////////////////////////////////////////////////////////////////
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if_z add counter, quarterRate ' Set packet and synchronize.
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if_c mov buffer, inputBufferAddress '
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if_c add buffer, receiverHead '
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if_c wrbyte receiverBuffer, buffer '
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if_c add receiverHead, #1 ' Update receiver head pointer.
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if_c and receiverHead, #$FF '
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if_c wrbyte receiverHead, inputHeadAddress '
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' //////////////////////Repeat/////////////////////////////////////////////////////////////////////////////////////////////////
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jmp #receiver ' Repeat
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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' Transmitter
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' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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transmitter jmpret transmitterPC, receiverPC ' Run some code.
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loop rdbyte buffer, outputHeadAddress ' Check if the buffer is empty.
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sub buffer, transmitterTail '
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tjz buffer, #transmitter '
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' //////////////////////Get Packet/////////////////////////////////////////////////////////////////////////////////////////////
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mov transmitterBuffer, outputBufferAddress ' Get packet and output start bit.
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add transmitterBuffer, transmitterTail '
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jmpret transmitterPC, receiverPC '
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rdbyte phsa, transmitterBuffer '
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add transmitterTail, #1 ' Update transmitter tail pointer.
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and transmitterTail, #$FF '
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wrbyte transmitterTail, outputTailAddress '
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' //////////////////////Transmitter Setup///////////////////////////////////////////////////////////////////////////////////////
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mov transmitterCounter, #(((Stop_Bits <# 32) #> 1) + 8) ' Setup loop to transmit the packet.
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' //////////////////////Transmit Packet////////////////////////////////////////////////////////////////////////////////////////
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transmit or phsa, #$100 ' Output bits.
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jmpret transmitterPC, receiverPC '
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ror phsa, #1 '
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|
||
|
|
djnz transmitterCounter, #transmit ' Ready next bit.
|
||
|
|
|
||
|
|
' //////////////////////Repeat/////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
jmp #loop ' Repeat.
|
||
|
|
|
||
|
|
' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
' Data
|
||
|
|
' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
receiverHead long 0
|
||
|
|
transmitterTail long 0
|
||
|
|
|
||
|
|
' //////////////////////Pin Masks//////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
RXPin long (|<((RX_Pin <# 31) #> 0)) ' Receiving pin mask.
|
||
|
|
TXPin long (|<((TX_Pin <# 31) #> 0)) ' Transmitting pin mask.
|
||
|
|
|
||
|
|
' //////////////////////Addresses//////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
inputHeadAddress long 0
|
||
|
|
inputTailAddress long 0
|
||
|
|
|
||
|
|
outputHeadAddress long 0
|
||
|
|
outputTailAddress long 0
|
||
|
|
|
||
|
|
inputBufferAddress long 0
|
||
|
|
outputBufferAddress long 0
|
||
|
|
|
||
|
|
' //////////////////////Run Time Variables/////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
buffer res 1
|
||
|
|
counter res 1
|
||
|
|
|
||
|
|
halfRate res 1
|
||
|
|
quarterRate res 1
|
||
|
|
|
||
|
|
' //////////////////////Receiver Variables/////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
receiverBuffer res 1
|
||
|
|
receiverCounter res 1
|
||
|
|
|
||
|
|
receiverTail res 1
|
||
|
|
|
||
|
|
receiverPC res 1
|
||
|
|
|
||
|
|
' //////////////////////Transmitter Variables//////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
transmitterBuffer res 1
|
||
|
|
transmitterCounter res 1
|
||
|
|
|
||
|
|
transmitterHead res 1
|
||
|
|
|
||
|
|
transmitterPC res 1
|
||
|
|
|
||
|
|
' /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
fit 496
|
||
|
|
|
||
|
|
{{
|
||
|
|
|
||
|
|
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
|
||
|
|
│ TERMS OF USE: MIT License │
|
||
|
|
├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
|
||
|
|
│Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation │
|
||
|
|
│files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, │
|
||
|
|
│modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the │
|
||
|
|
│Software is furnished to do so, subject to the following conditions: │
|
||
|
|
│ │
|
||
|
|
│The above copyright notice and this permission notice shall be included in all copies or substantial portions of the │
|
||
|
|
│Software. │
|
||
|
|
│ │
|
||
|
|
│THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE │
|
||
|
|
│WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR │
|
||
|
|
│COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
|
||
|
|
│ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
|
||
|
|
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
|
||
|
|
}}
|