PropBasic jm_ir_hdserial header
Rsadeika
Posts: 3,824
in Propeller 1
I am considering a driver for using the IR, found on the Hackable Badge and QuickStart HIB board. Since their are a few PropBasic programmers here, which way would be the best way to accomplish this?
I found a Spin program that JonnyMac has developed, which has an PASM component and a Spin component. Using that as a reference, which approach is the best. From the jm_ir_hdserial.spin code, it looks like maybe taking the PASM section and trying to fit it in the PropBasic format would be a consideration, not sure about that though. Any ideas as to how to approach this? Of course this would be a lib file so it could be added/used in other PropBasic programs.
Ray
I found a Spin program that JonnyMac has developed, which has an PASM component and a Spin component. Using that as a reference, which approach is the best. From the jm_ir_hdserial.spin code, it looks like maybe taking the PASM section and trying to fit it in the PropBasic format would be a consideration, not sure about that though. Any ideas as to how to approach this? Of course this would be a lib file so it could be added/used in other PropBasic programs.
Ray
{ ----------------------------- }
{ I R U A R T D R I V E R }
{ ----------------------------- }
dat { ir uart }
org 0
irhds mov t1, par ' start of structure
mov rxheadpntr, t1 ' save hub address of rxhead
add t1, #4
mov rxtailpntr, t1 ' save hub address of rxtail
add t1, #4
rdlong rxbufpntr, t1 ' read address of rxbuf[0]
add t1, #4
mov txheadpntr, t1 ' save hub address of txhead
add t1, #4
mov txtailpntr, t1 ' save hub address of txtail
add t1, #4
rdlong txbufpntr, t1 ' read address of txbuf[0]
add t1, #4
rdlong t2, t1 ' get rxpin
mov rxmask, #1 ' make pin mask
shl rxmask, t2
andn dira, rxmask ' force to input
add t1, #4
rdlong t2, t1 ' get txpin
mov txmask, #1 ' make pin mask
shl txmask, t2
andn dira, txmask ' disable modulation
add t1, #4
rdlong bit1x0tix, t1 ' read 1.0 bit timing
mov bit1x5tix, bit1x0tix ' create 1.5 bit timing
shr bit1x5tix, #1
add bit1x5tix, bit1x0tix
add t1, #4 ' get mod frequency
rdlong frqa, t1 ' setup ctra modulation
or t2, NCO_SE ' on tx pin
mov ctra, t2 ' activate counter
' =========
' RECEIVE
' =========
rxserial mov rxtimer, cnt ' start timer
test rxmask, ina wc ' look for start bit
if_c jmp #txserial ' if no start, check tx
receive add rxtimer, bit1x5tix ' skip start bit
mov rxwork, #0 ' clear work var
mov rxcount, #8 ' rx 8 bits
rxbyte waitcnt rxtimer, bit1x0tix ' wait for middle of bit
test rxmask, ina wc ' rx --> c
shr rxwork, #1 ' prep for next bit
muxc rxwork, #%1000_0000 ' add bit tor rxwork
djnz rxcount, #rxbyte
waitcnt rxtimer, #0 ' let last bit finish
test rxmask, ina wc ' verify stop bit
if_nc jmp #txserial ' skip if bad IR input
putrxbuf rdlong t1, rxheadpntr ' t1 := rxhead
add t1, rxbufpntr ' t1 := rxbuf[rxhead]
wrbyte rxwork, t1 ' rxbuf[rxhead] := rxwork
sub t1, rxbufpntr ' t1 := rxhead
add t1, #1 ' inc t1
and t1, #BUF_MASK ' rollover if needed
wrlong t1, rxheadpntr ' rxhead := t1
' ==========
' TRANSMIT
' ==========
txserial rdlong t1, txheadpntr ' t1 = txhead
rdlong t2, txtailpntr ' t2 = txtail
cmp t1, t2 wz ' byte(s) to tx?
if_z jmp #rxserial ' check rx
gettxbuf mov t1, txbufpntr ' t1 := @txbuf[0]
add t1, t2 ' t1 := @txbuf[txtail]
rdbyte txwork, t1 ' txwork := txbuf[txtail]
updatetxtail add t2, #1 ' inc txtail
and t2, #BUF_MASK ' wrap to 0 if necessary
wrlong t2, txtailpntr ' save
transmit or txwork, STOP_BITS ' set stop bit(s)
shl txwork, #1 ' add start bit
mov txcount, #11 ' start + 8 data + 2 stop
mov txtimer, bit1x0tix ' load bit timing
add txtimer, cnt ' sync with system counter
txbit shr txwork, #1 wc ' move bit0 to C
muxnc dira, txmask ' enable modulation if C == 0
waitcnt txtimer, bit1x0tix ' let timer expire, reload
djnz txcount, #txbit ' update bit count
jmp #txserial
' -------------------------------------------------------------------------------------------------
NCO_SE long %00100 << 26 ' S/E NCO mode
STOP_BITS long $FFFF_FF00
rxheadpntr res 1 ' head pointer
rxtailpntr res 1 ' tail pointer
rxbufpntr res 1 ' hub address of rxbuf[0]
txheadpntr res 1 ' head pointer
txtailpntr res 1 ' tail pointer
txbufpntr res 1 ' hub address of txbuf[0]
rxmask res 1 ' rx pin mask
txmask res 1 ' tx pin mask
bit1x0tix res 1 ' 1.0 bit timing
bit1x5tix res 1 ' 1.5 bit timing
rxwork res 1 ' rx byte in
rxcount res 1 ' bits to receive
rxtimer res 1 ' timer for bit sampling
txwork res 1 ' tx byte out
txcount res 1 ' bits to transmit
txtimer res 1 ' timer for bit output
t1 res 1 ' work vars
t2 res 1
t3 res 1
fit 496
Comments
Receiving is the same everywhere. To transmit IR, you need to assign one of the counters to the TX pin and set it to run as an oscillator for your modulation frequency. When you want to output a start or "0" bit, enable the output driver for the TX pin.
Easy peasy.