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jm_sircs_rx.spin
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jm_sircs_rx.spin
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'' ================================================================================================='''' File....... jm_sircs_rx.spin'' Purpose.... SIRCS-compatible IR receiver'' Author..... Jon "JonnyMac" McPhalen'' Copyright (c) 2009-2014 Jon McPhalen '' -- see below for terms of use'' E-mail..... jon@jonmcphalen.com'' Started.... '' Updated.... 08 JUL 2014'''' ================================================================================================={{ Example IR Connection (PNA4602M) ┌───┐ │(*)│ 5v └┬┬┬┘ ir ──┘│└──┘ Protocol Reference: -- http://www.sbprojects.com/knowledge/ir/sirc.php }} var long cog ' cog id long ircode ' rx'd code long irbits ' bits in codepub start(p) '' Start SIRCS receiver on pin p stop ircode := p ' set pin irbits := clkfreq / 1_000_000 * 2_160 ' 90% of 2.4ms cog := cognew(@rxsircs, @ircode) + 1 ' start cog repeat until (irbits < 0) ' wait for cog to initialize return cog pub stop'' Stops SIRCS receiver cog if running if (cog) cogstop(cog - 1) cog := 0 disable pub enable'' Enables SIRCS receive process longfill(@ircode, 0, 2)pub disable'' Disable SIRCS receive process longfill(@ircode, -1, 2) pub rx'' Enables and waits for ir input'' -- warning: blocks until IR code received!'' -- does not remove code/bits from buffer enable ' allow ir rx repeat until (irbits > 0) ' wait for code return ircode pub rxcheck'' Returns code if available, -1 if none'' -- must have previously been enabled'' -- does not remove code/bits from buffer if (irbits > 0) ' if code ready return ircode else return -1 pub bit_count'' Returns bit count of last ir code'' -- check status before using'' -- if 0, no code is available or disabled if (irbits > 0) return irbits else return 0 dat org 0rxsircs mov t1, par ' start of parameters rdlong t2, t1 ' read rx pin mov rxmask, #1 ' convert to mask shl rxmask, t2 mov ctra, NEG_DETECT ' ctra measures bit width or ctra, t2 ' of rx pin mov frqa, #1 mov ctrb, POS_DETECT ' ctrb measures idle state or ctrb, t2 ' of rx pin mov frqb, #1 add t1, #4 rdlong starttix, t1 ' read ticks in start bit mov bittix, starttix shr bittix, #1 ' '1' bit is 1/2 start bit neg t2, #1 ' t2 := -1 mov t1, par wrlong t2, t1 ' write to ircode add t1, #4 wrlong t2, t1 ' write to irbits waitrx rdlong t1, par wz ' wait for enable (0) if_nz jmp #waitrx waitstart waitpeq rxmask, rxmask ' wait for idle mov phsa, #0 ' reset bit timer waitpne rxmask, rxmask ' wait for falling edge nop waitpeq rxmask, rxmask ' wait for rising edge cmp starttix, phsa wc, wz ' valid start bit? if_a jmp #waitstart ' try again if norestart mov phsb, #0 ' reset timeout mov rxbits, #0 ' reset bit count waitbit mov phsa, #0 ' reset bit timer:loop cmp bittix, phsb wc ' check timeout while waiting if_b jmp #irdone ' if timeout exceeded, abort test rxmask, ina wz ' look for new bit if_nz jmp #:loopgetbit mov phsb, #0 ' reset timeout waitpeq rxmask, rxmask ' let bit finish cmp starttix, phsa wc ' check for restart if_b jmp #restart cmp bittix, phsa wc ' measure bit --> C rcr rxwork, #1 ' C --> rxwork.31 add rxbits, #1 cmp rxbits, #32 wz, wc if_b jmp #waitbitirdone mov t1, #32 sub t1, rxbits wz if_nz shr rxwork, t1 ' right align ir code mov t1, par ' point to ircode wrlong rxwork, t1 ' write rx'd code add t1, #4 ' point to irbits wrlong rxbits, t1 ' write rx'd bits jmp #waitrx ' -------------------------------------------------------------------------------------------------POS_DETECT long %01000 << 26 ' increment phsx on highNEG_DETECT long %01100 << 26 ' increment phsx on lowrxmask res 1 ' mask for IR sensor inputstarttix res 1 ' ticks in start bitbittix res 1 ' ticks in '1' bit rxbits res 1 ' # of bits rx'drxwork res 1 ' workspace for incoming byte t1 res 1 ' work varst2 res 1 fit 496dat{{ 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 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.}}