335 lines
11 KiB
Plaintext
335 lines
11 KiB
Plaintext
|
'' Singleton version of:
|
|||
|
|
''
|
|||
|
|
''********************************************
|
|||
|
|
''* Full-Duplex Serial Driver v1.2 *
|
|||
|
|
''* Author: Chip Gracey, Jeff Martin *
|
|||
|
|
''* Copyright (c) 2006-2009 Parallax, Inc. *
|
|||
|
|
''* See end of file for terms of use. *
|
|||
|
|
''********************************************
|
|||
|
|
|
|||
|
|
{-----------------REVISION HISTORY-----------------
|
|||
|
|
v1.2 - 5/7/2009 fixed bug in dec method causing largest negative value (-2,147,483,648) to be output as -0.
|
|||
|
|
v1.1 - 3/1/2006 first official release.
|
|||
|
|
}
|
|||
|
|
CON EOL = $a
|
|||
|
|
CON CR = $d
|
|||
|
|
|
|||
|
|
VAR
|
|||
|
|
|
|||
|
|
long cog 'cog flag/id
|
|||
|
|
|
|||
|
|
DAT
|
|||
|
|
|
|||
|
|
rx_head long 0 '9 contiguous longs
|
|||
|
|
rx_tail long 0
|
|||
|
|
tx_head long 0
|
|||
|
|
tx_tail long 0
|
|||
|
|
rx_pin long 0
|
|||
|
|
tx_pin long 0
|
|||
|
|
rxtx_mode long 0
|
|||
|
|
bit_ticks long 0
|
|||
|
|
buffer_ptr long 0
|
|||
|
|
|
|||
|
|
rx_buffer byte 0 [16] 'transmit and receive buffers
|
|||
|
|
tx_buffer byte 0 [16]
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB start(rxpin, txpin, mode, baudrate) : okay
|
|||
|
|
|
|||
|
|
'' Start serial driver - starts a cog
|
|||
|
|
'' returns false if no cog available
|
|||
|
|
''
|
|||
|
|
'' mode bit 0 = invert rx
|
|||
|
|
'' mode bit 1 = invert tx
|
|||
|
|
'' mode bit 2 = open-drain/source tx
|
|||
|
|
'' mode bit 3 = ignore tx echo on rx
|
|||
|
|
|
|||
|
|
stop
|
|||
|
|
longfill(@rx_head, 0, 4)
|
|||
|
|
longmove(@rx_pin, @rxpin, 3)
|
|||
|
|
bit_ticks := clkfreq / baudrate
|
|||
|
|
buffer_ptr := @rx_buffer
|
|||
|
|
okay := cog := cognew(@entry, @rx_head) + 1
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB stop
|
|||
|
|
|
|||
|
|
'' Stop serial driver - frees a cog
|
|||
|
|
|
|||
|
|
if cog
|
|||
|
|
cogstop(cog~ - 1)
|
|||
|
|
longfill(@rx_head, 0, 9)
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB rxflush
|
|||
|
|
|
|||
|
|
'' Flush receive buffer
|
|||
|
|
|
|||
|
|
repeat while rxcheck => 0
|
|||
|
|
|
|||
|
|
PUB rxready
|
|||
|
|
return rx_tail <> rx_head
|
|||
|
|
|
|||
|
|
PUB rxcheck : rxbyte
|
|||
|
|
|
|||
|
|
'' Check if byte received (never waits)
|
|||
|
|
'' returns -1 if no byte received, $00..$FF if byte
|
|||
|
|
|
|||
|
|
rxbyte--
|
|||
|
|
if rx_tail <> rx_head
|
|||
|
|
rxbyte := rx_buffer[rx_tail]
|
|||
|
|
rx_tail := (rx_tail + 1) & $F
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB rxtime(ms) : rxbyte | t
|
|||
|
|
|
|||
|
|
'' Wait ms milliseconds for a byte to be received
|
|||
|
|
'' returns -1 if no byte received, $00..$FF if byte
|
|||
|
|
|
|||
|
|
t := cnt
|
|||
|
|
repeat until (rxbyte := rxcheck) => 0 or (cnt - t) / (clkfreq / 1000) > ms
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB rx : rxbyte
|
|||
|
|
|
|||
|
|
'' Receive byte (may wait for byte)
|
|||
|
|
'' returns $00..$FF
|
|||
|
|
|
|||
|
|
repeat while (rxbyte := rxcheck) < 0
|
|||
|
|
|
|||
|
|
PUB out(txbyte)
|
|||
|
|
tx(txbyte)
|
|||
|
|
|
|||
|
|
PUB tx(txbyte)
|
|||
|
|
|
|||
|
|
if txbyte == EOL
|
|||
|
|
tx(CR)
|
|||
|
|
|
|||
|
|
'' Send byte (may wait for room in buffer)
|
|||
|
|
|
|||
|
|
repeat until (tx_tail <> (tx_head + 1) & $F)
|
|||
|
|
tx_buffer[tx_head] := txbyte
|
|||
|
|
tx_head := (tx_head + 1) & $F
|
|||
|
|
|
|||
|
|
if rxtx_mode & %1000
|
|||
|
|
rx
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB str(stringptr)
|
|||
|
|
|
|||
|
|
'' Send string
|
|||
|
|
|
|||
|
|
repeat while byte[stringptr]
|
|||
|
|
tx(byte[stringptr++])
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB dec(value) | i, x
|
|||
|
|
|
|||
|
|
'' Print a decimal number
|
|||
|
|
|
|||
|
|
x := value == NEGX 'Check for max negative
|
|||
|
|
if value < 0
|
|||
|
|
value := ||(value+x) 'If negative, make positive; adjust for max negative
|
|||
|
|
tx("-") 'and output sign
|
|||
|
|
|
|||
|
|
i := 1_000_000_000 'Initialize divisor
|
|||
|
|
|
|||
|
|
repeat 10 'Loop for 10 digits
|
|||
|
|
if value => i
|
|||
|
|
tx(value / i + "0" + x*(i == 1)) 'If non-zero digit, output digit; adjust for max negative
|
|||
|
|
value //= i 'and digit from value
|
|||
|
|
result~~ 'flag non-zero found
|
|||
|
|
elseif result or i == 1
|
|||
|
|
tx("0") 'If zero digit (or only digit) output it
|
|||
|
|
i /= 10 'Update divisor
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB hex(value, digits)
|
|||
|
|
|
|||
|
|
'' Print a hexadecimal number
|
|||
|
|
|
|||
|
|
value <<= (8 - digits) << 2
|
|||
|
|
repeat digits
|
|||
|
|
tx(lookupz((value <-= 4) & $F : "0".."9", "A".."F"))
|
|||
|
|
|
|||
|
|
|
|||
|
|
PUB bin(value, digits)
|
|||
|
|
|
|||
|
|
'' Print a binary number
|
|||
|
|
|
|||
|
|
value <<= 32 - digits
|
|||
|
|
repeat digits
|
|||
|
|
tx((value <-= 1) & 1 + "0")
|
|||
|
|
|
|||
|
|
|
|||
|
|
DAT
|
|||
|
|
|
|||
|
|
'***********************************
|
|||
|
|
'* Assembly language serial driver *
|
|||
|
|
'***********************************
|
|||
|
|
|
|||
|
|
org
|
|||
|
|
'
|
|||
|
|
'
|
|||
|
|
' Entry
|
|||
|
|
'
|
|||
|
|
entry mov t1,par 'get structure address
|
|||
|
|
add t1,#4 << 2 'skip past heads and tails
|
|||
|
|
|
|||
|
|
rdlong t2,t1 'get rx_pin
|
|||
|
|
mov rxmask,#1
|
|||
|
|
shl rxmask,t2
|
|||
|
|
|
|||
|
|
add t1,#4 'get tx_pin
|
|||
|
|
rdlong t2,t1
|
|||
|
|
mov txmask,#1
|
|||
|
|
shl txmask,t2
|
|||
|
|
|
|||
|
|
add t1,#4 'get rxtx_mode
|
|||
|
|
rdlong rxtxmode,t1
|
|||
|
|
|
|||
|
|
add t1,#4 'get bit_ticks
|
|||
|
|
rdlong bitticks,t1
|
|||
|
|
|
|||
|
|
add t1,#4 'get buffer_ptr
|
|||
|
|
rdlong rxbuff,t1
|
|||
|
|
mov txbuff,rxbuff
|
|||
|
|
add txbuff,#16
|
|||
|
|
|
|||
|
|
test rxtxmode,#%100 wz 'init tx pin according to mode
|
|||
|
|
test rxtxmode,#%010 wc
|
|||
|
|
if_z_ne_c or outa,txmask
|
|||
|
|
if_z or dira,txmask
|
|||
|
|
|
|||
|
|
mov txcode,#transmit 'initialize ping-pong multitasking
|
|||
|
|
'
|
|||
|
|
'
|
|||
|
|
' Receive
|
|||
|
|
'
|
|||
|
|
receive jmpret rxcode,txcode 'run a chunk of transmit code, then return
|
|||
|
|
|
|||
|
|
test rxtxmode,#%001 wz 'wait for start bit on rx pin
|
|||
|
|
test rxmask,ina wc
|
|||
|
|
if_z_eq_c jmp #receive
|
|||
|
|
|
|||
|
|
mov rxbits,#9 'ready to receive byte
|
|||
|
|
mov rxcnt,bitticks
|
|||
|
|
shr rxcnt,#1
|
|||
|
|
add rxcnt,cnt
|
|||
|
|
|
|||
|
|
:bit add rxcnt,bitticks 'ready next bit period
|
|||
|
|
|
|||
|
|
:wait jmpret rxcode,txcode 'run a chuck of transmit code, then return
|
|||
|
|
|
|||
|
|
mov t1,rxcnt 'check if bit receive period done
|
|||
|
|
sub t1,cnt
|
|||
|
|
cmps t1,#0 wc
|
|||
|
|
if_nc jmp #:wait
|
|||
|
|
|
|||
|
|
test rxmask,ina wc 'receive bit on rx pin
|
|||
|
|
rcr rxdata,#1
|
|||
|
|
djnz rxbits,#:bit
|
|||
|
|
|
|||
|
|
shr rxdata,#32-9 'justify and trim received byte
|
|||
|
|
and rxdata,#$FF
|
|||
|
|
test rxtxmode,#%001 wz 'if rx inverted, invert byte
|
|||
|
|
if_nz xor rxdata,#$FF
|
|||
|
|
|
|||
|
|
rdlong t2,par 'save received byte and inc head
|
|||
|
|
add t2,rxbuff
|
|||
|
|
wrbyte rxdata,t2
|
|||
|
|
sub t2,rxbuff
|
|||
|
|
add t2,#1
|
|||
|
|
and t2,#$0F
|
|||
|
|
wrlong t2,par
|
|||
|
|
|
|||
|
|
jmp #receive 'byte done, receive next byte
|
|||
|
|
'
|
|||
|
|
'
|
|||
|
|
' Transmit
|
|||
|
|
'
|
|||
|
|
transmit jmpret txcode,rxcode 'run a chunk of receive code, then return
|
|||
|
|
|
|||
|
|
mov t1,par 'check for head <> tail
|
|||
|
|
add t1,#2 << 2
|
|||
|
|
rdlong t2,t1
|
|||
|
|
add t1,#1 << 2
|
|||
|
|
rdlong t3,t1
|
|||
|
|
cmp t2,t3 wz
|
|||
|
|
if_z jmp #transmit
|
|||
|
|
|
|||
|
|
add t3,txbuff 'get byte and inc tail
|
|||
|
|
rdbyte txdata,t3
|
|||
|
|
sub t3,txbuff
|
|||
|
|
add t3,#1
|
|||
|
|
and t3,#$0F
|
|||
|
|
wrlong t3,t1
|
|||
|
|
|
|||
|
|
or txdata,#$100 'ready byte to transmit
|
|||
|
|
shl txdata,#2
|
|||
|
|
or txdata,#1
|
|||
|
|
mov txbits,#11
|
|||
|
|
mov txcnt,cnt
|
|||
|
|
|
|||
|
|
:bit test rxtxmode,#%100 wz 'output bit on tx pin according to mode
|
|||
|
|
test rxtxmode,#%010 wc
|
|||
|
|
if_z_and_c xor txdata,#1
|
|||
|
|
shr txdata,#1 wc
|
|||
|
|
if_z muxc outa,txmask
|
|||
|
|
if_nz muxnc dira,txmask
|
|||
|
|
add txcnt,bitticks 'ready next cnt
|
|||
|
|
|
|||
|
|
:wait jmpret txcode,rxcode 'run a chunk of receive code, then return
|
|||
|
|
|
|||
|
|
mov t1,txcnt 'check if bit transmit period done
|
|||
|
|
sub t1,cnt
|
|||
|
|
cmps t1,#0 wc
|
|||
|
|
if_nc jmp #:wait
|
|||
|
|
|
|||
|
|
djnz txbits,#:bit 'another bit to transmit?
|
|||
|
|
|
|||
|
|
jmp #transmit 'byte done, transmit next byte
|
|||
|
|
'
|
|||
|
|
'
|
|||
|
|
' Uninitialized data
|
|||
|
|
'
|
|||
|
|
t1 res 1
|
|||
|
|
t2 res 1
|
|||
|
|
t3 res 1
|
|||
|
|
|
|||
|
|
rxtxmode res 1
|
|||
|
|
bitticks res 1
|
|||
|
|
|
|||
|
|
rxmask res 1
|
|||
|
|
rxbuff res 1
|
|||
|
|
rxdata res 1
|
|||
|
|
rxbits res 1
|
|||
|
|
rxcnt res 1
|
|||
|
|
rxcode res 1
|
|||
|
|
|
|||
|
|
txmask res 1
|
|||
|
|
txbuff res 1
|
|||
|
|
txdata res 1
|
|||
|
|
txbits res 1
|
|||
|
|
txcnt res 1
|
|||
|
|
txcode res 1
|
|||
|
|
|
|||
|
|
{{
|
|||
|
|
|
|||
|
|
+------------------------------------------------------------------------------------------------------------------------------+
|
|||
|
|
<EFBFBD> TERMS OF USE: MIT License <20>
|
|||
|
|
+------------------------------------------------------------------------------------------------------------------------------<2D>
|
|||
|
|
<EFBFBD>Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation <20>
|
|||
|
|
<EFBFBD>files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, <20>
|
|||
|
|
<EFBFBD>modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software<72>
|
|||
|
|
<EFBFBD>is furnished to do so, subject to the following conditions: <20>
|
|||
|
|
<EFBFBD> <20>
|
|||
|
|
<EFBFBD>The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.<2E>
|
|||
|
|
<EFBFBD> <20>
|
|||
|
|
<EFBFBD>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE <20>
|
|||
|
|
<EFBFBD>WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR <20>
|
|||
|
|
<EFBFBD>COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, <20>
|
|||
|
|
<EFBFBD>ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. <20>
|
|||
|
|
+------------------------------------------------------------------------------------------------------------------------------+
|
|||
|
|
}}
|