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jm_rxserial.spin
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jm_rxserial.spin
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'' =================================================================================================
''
'' File....... jm_rxserial.spin
'' Purpose.... True mode serial receive driver -- with buffer
'' Author..... Jon "JonnyMac" McPhalen (aka Jon Williams)
'' Copyright (c) 2009 Jon McPhalen
'' -- see below for terms of use
'' E-mail..... jon@jonmcphalen.com
'' Started....
'' Updated.... 06 JUL 2009
''
'' =================================================================================================
'' Modified by Lawson from https://forums.parallax.com/discussion/114492/prop-baudrates
'' Modified by Joe Grand 3/9/18, changed receiver delay to waitpeq (wait for rising edge) instead of waitcnt for final bit in byte
con
buff_mask = $1ff 'must be all ones
buff_size = buff_mask+1
var
long cog
long rxPin ' receive pin
long rxBitTix ' counter ticks per bit
long rxHead ' head pointer (0..511)
long rxTail ' tail pointer (0..511)
long rxPntr ' address of rxBuf[0]
byte rxBuf[buff_size] ' receive buffer
pub init(rxd, baud) : okay
'' Creates true mode receive UART on pin rxd at baud rate
cleanup
rxPin := rxd
rxBitTix := clkfreq / baud
rxHead := 0
rxTail := 0
rxPntr := @rxBuf
bytefill(@rxBuf, 0, buff_size) ' clear buffer
okay := cog := cognew(@rxserial, @rxPin) + 1
pub cleanup
'' Stops serial RX driver; frees a cog
if cog
cogstop(cog~ - 1)
pub rx | c
'' Pulls c from receive buffer if available
'' -- will wait if buffer is empty
repeat while rxTail == rxHead
c := rxBuf[rxTail]
rxTail := (rxTail + 1) & buff_mask
return c
pub flush
'' Flushes rx buffer
rxHead := 0
rxTail := 0
bytefill(@rxBuf, 0, buff_size) ' clear buffer
dat
org 0
rxserial mov tmp1, par ' start of structure
rdlong tmp2, tmp1 ' read rx pin
mov rxmask, #1 ' create rx pin mask
shl rxmask, tmp2
andn dira, rxmask ' make rx pin an input
add tmp1, #4
rdlong rxbit1x0, tmp1 ' get bit timing
mov rxbit1x5, rxbit1x0 ' set timing for 1.5 bits
shr rxbit1x5, #1
add rxbit1x5, rxbit1x0
add tmp1, #4
mov rxheadpntr, tmp1 ' save pointer addresses
add tmp1, #4
mov rxtailpntr, tmp1
add tmp1, #4
rdlong rxbufpntr, tmp1 ' get buffer address
rxbyte call #receive
putbuf rdlong tmp1, rxheadpntr ' tmp1 := rxhead
add tmp1, rxbufpntr ' tmp1 := rxbuf[rxhead]
wrbyte rxwork, tmp1 ' rxbuf[rxhead] := rxwork
sub tmp1, rxbufpntr ' tmp1 := rxhead
add tmp1, #1 ' inc tmp1
and tmp1, #buff_mask ' keep 0..511
wrlong tmp1, rxheadpntr ' rxhead := tmp1
jmp #rxbyte
' -----------------
' True Mode RX UART
' -----------------
'
receive mov rxwork, #0 ' clear work var
mov rxcount, #8 ' rx eight data bits
mov rxtimer, rxbit1x5 ' set timer to 1.5 bits
waitstart waitpne rxmask, rxmask ' wait for falling edge
add rxtimer, cnt ' sync with system counter
rxbit waitcnt rxtimer, rxbit1x0 ' hold for middle of bit
test rxmask, ina wc ' receive bit, rx --> c
shr rxwork, #1 ' prep for new bit
muxc rxwork, #%1000_0000 ' c --> rxwork.7
djnz rxcount, #rxbit ' update bit count
waitpeq rxmask, rxmask ' let last bit finish (wait for rising edge)
receive_ret ret
' -------------------------------------------------------------------------------------------------
tmp1 res 1
tmp2 res 1
rxmask res 1 ' mask for rx pin
rxbit1x0 res 1 ' ticks per bit
rxbit1x5 res 1 ' ticks per 1.5 bits
rxheadpntr res 1 ' pointer to head position
rxtailpntr res 1 ' pointer to tail position
rxbufpntr res 1 ' pointer to rxbuf[0]
rxwork res 1 ' rx byte input
rxcount res 1 ' bits to receive
rxtimer res 1 ' timer for bit sampling
fit 492
dat
{{
Copyright (c) 2009 Jon McPhalen (aka Jon Williams)
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 NON-INFRINGEMENT. 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.
}}