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Ttelmah
Joined: 11 Mar 2010
Posts: 19539
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 Posted: Thu Mar 11, 2021 12:50 pm |
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On a modern compiler, the pwm_off syntax would work, provided the output
'floats off'. |
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Denny9167
Joined: 15 Feb 2021
Posts: 49
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| Posted: Sun May 23, 2021 5:03 pm |
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I finally found some code that I could use for the 12F1822, using the NEC protocol, Ive been studying alot of assembly code, and seem to have a better grasp on it, I would like to learn more C, but at least I think Im getting a head start. I'll post the asm file. It would be nice to have a C version of this.
an include file contains all the setup info.
| Code: |
;**********************************************************************
; BROWN AUDIO LABS *
; PROJECT: Volume and Relay Control *
; INTERNAL CLOCK: 4Mhz *
; NEC FORMAT @38KHz *
; ADDRESS ID = 0xBA *
; CMD = 0x10 *
; CMD = 0x20 *
; CMD = 0x30 *
; CMD = 0x40 *
; CMD = 0x50 *
;**********************************************************************
include "devices_setup(NEC).inc"
CLOCK_RATIO equ CLOCK_FREQUENCY/4000000 ; 8MHz = 1/2usec per ins, 4MHz = 1usec per ins
; 8-pin DIP
; VDD -|1 8|- VSS
; GP5 -|2 7|- GP0
; GP4 -|3 6|- GP1
; GP3 -|4 5|- GP2
;
#define PIN_IR 3 ; MCLR can only be an input
#define PIN_MTR1 0
#define PIN_MTR2 1
#define PIN_RLY1 2
#define PIN_RLY2 4
#define PIN_RLY3 5
#define RLY_MASK (1<<PIN_RLY1)|(1<<PIN_RLY2)|(1<<PIN_RLY3)
#define PINPORT_IR PORTIO,PIN_IR
#define PINPORT_MTR1 PORTIO,PIN_MTR1
#define PINPORT_MTR2 PORTIO,PIN_MTR2
#define PINPORT_RLY1 PORTIO,PIN_RLY1
#define PINPORT_RLY2 PORTIO,PIN_RLY2
#define PINPORT_RLY3 PORTIO,PIN_RLY3
#define TRIS_BITS (1<<PIN_IR)
ADDRS_ID equ 0xBA
MTR1_CMD equ 0x10
MTR2_CMD equ 0x20
RLY1_CMD equ 0x30
RLY2_CMD equ 0x40
RLY3_CMD equ 0x50
cblock
ADDRS
INV_ADDRS
CMD
INV_CMD
endc
; We sample the input line in chunks, and make decisions based on the 8-bit counts of the high/low durations.
; A chunk is a number of samples, within each chunk we check for at least 75% of the samples being high or low.
; Longer chunks handle noise better, but give less resolution for the overall duration timing.
CHUNK_USEC equ 55
CHUNK_INS equ CHUNK_USEC*INS_PER_USEC
; Sanity check the chunk size
#if (CHUNK_INS%5)!=0
error Chunk length must be a multiple of 5 instructions
#else
#if (CHUNK_INS<40)
error Chunk length less than 8 samples
#else
#if (((92632/(10*CHUNK_USEC))*150/100)>=256)
error Chunk length too short, 150% of 9.2ms is more than 256 chunks
#else
#if ((5789/(10*CHUNK_USEC))<3)
error Chunk length too long, need at least 3 samples in the 0.5789ms pulses
#endif
#endif
#endif
#endif
; With 55usec chunks (4MHz=11 loops, 8MHz=22 loops) the timings we are interested in are:
; Duration Chunks Desc
; 9.2632ms ~168 (hi) start pulse
; 0.5789ms 10.5 (hi) data / stop high bit
; 4.6316ms ~84 (lo) gap after start bit
; 0.5789ms 10.5 (lo) data bit '0' gap
; 1.7368ms 31.5 (lo) data bit '1' gap
; Return the number of high chunks in FUNC_TMP0, and return STATUS,C set if we get an error (more than 256 high chunks)
time_hi:
clrf FUNC_TMP0
time_h1:
movlw CHUNK_INS/5
movwf FUNC_TMP1
movlw CHUNK_INS*2/(3*5)
movwf FUNC_TMP2 ; Target count is 2/3 high
time_h2:
btfss PINPORT_IR ; IR receiver outputs a low when we have a signal, so skip if high (so no signal)
decf FUNC_TMP2,F
decfsz FUNC_TMP1,F
BRA time_h2
bcf STATUS,C ; Assume no error
btfss FUNC_TMP2,7 ; Top bit should have gone negative, if was high for 2/3 or more of the samples
retlw 0x22 ; Now low, so return FUNC_TMP0 count
incfsz FUNC_TMP0,F
BRA time_h1
bsf STATUS,C ; Is too long (55usec*256=14.1msec)
retlw 0x33
; Return the number of low chunks in FUNC_TMP0, and return STATUS,C set if we get an error (more than 256 low chunks)
time_lo:
clrf FUNC_TMP0
time_l1:
movlw CHUNK_INS/5
movwf FUNC_TMP1
movlw CHUNK_INS*2/(3*5)
movwf FUNC_TMP2 ; Target count is 2/3 low
time_l2:
btfsc PINPORT_IR ; IR receiver outputs a low when we have a signal, so skip if low (so have signal)
decf FUNC_TMP2,F
decfsz FUNC_TMP1,F
BRA time_l2
bcf STATUS,C ; Assume no error
btfss FUNC_TMP2,7 ; Top bit should have gone negative, if was low for 2/3 or more of the samples
retlw 0x22 ; Now high, so return FUNC_TMP0 count
incfsz FUNC_TMP0,F
BRA time_l1
bsf STATUS,C ; Is too long (55usec*256=14.1msec)
retlw 0x33
; -----------------------------------------------------------------
STARTUP_CODE
clrf PORTIO
reset: ; Power on, or no codes for 100ms+
movlw ~((1<<PIN_MTR1)|(1<<PIN_MTR2))
andwf PORTIO,F ; Clear the up/down motor outputs
wait_reset:
movlw 1+(100000/(256*CHUNK_USEC)) ; Wait for 100ms+ worth of chunks
movwf FUNC_TMP3 ; time_lo/hi uses TMP0/1/2
wait_count:
decf FUNC_TMP3,F
btfsc FUNC_TMP3,7
BRA reset
clrf ADDRS
clrf INV_ADDRS
clrf CMD
clrf INV_CMD
bsf INV_CMD,0 ; When this bit pops out the top, we're done
call time_lo
btfsc STATUS,C
BRA wait_count ; timeout, so is still low!
; This is either a start bit (so upto 9ms on+4.5ms off) or a data bit (0.5789ms high)
call time_hi
btfsc STATUS,C
BRA reset ; timeout, so is still high!
movlw 5789*150/(CHUNK_USEC*1000) ; 578.9 usec*150%
subwf FUNC_TMP0,W ; W=Count-Target
btfss STATUS,C
BRA got_first ; Got borrow, so <15, so was the first bit, so skip wait
call time_lo
btfsc STATUS,C
BRA wait_count ; timeout, so is still low!
movlw 46316*50/(CHUNK_USEC*1000) ; Look for 50% of 4.6ms
subwf FUNC_TMP0,W ; W=Count-Target
btfss STATUS,C
BRA wait_count ; Got borrow, so <Target, so bad !
main_bit:
call time_hi
btfsc STATUS,C
BRA reset ; timeout, so is still high!
movlw (5789*150/(CHUNK_USEC*1000))-1 ; 578.9 usec*150%
subwf FUNC_TMP0,W ; W=Count-(Target-1)
btfsc STATUS,C
BRA reset ; No borrow, so >=(Target-1), so too long
got_first:
call time_lo
btfsc STATUS,C
BRA reset ; timeout, so is still lo!
movlw ((17368*150)/(CHUNK_USEC*1000))-1 ; Look for longer than 150% of 1736.8
subwf FUNC_TMP0,W ; W=Count-(Target-1)
btfsc STATUS,C
BRA check_rpt ; No borrow, so Count is really big, check if it's the repeat
movlw ((5789+17368)/(CHUNK_USEC*20))-1 ; Look for midpoint of 578.9usec and 1736.8usec
subwf FUNC_TMP0,W ; W=Count-(Target-1)
rlf INV_CMD,F ; the sub leaves the borrow/carry in C, shift into LSB
rlf CMD,F
rlf INV_ADDRS,F
rlf ADDRS,F
btfss STATUS,C
BRA main_bit ; Marker bit didn't ripple out, so go again
call time_hi ; Clear stop bit
comf INV_ADDRS,W
xorwf ADDRS,W
btfss STATUS,Z
BRA reset ; Device ID bits weren't compliments
comf INV_CMD,W
xorwf CMD,W
btfss STATUS,Z
BRA reset ; Code bits weren't compliments
movlw ADDRS_ID
xorwf ADDRS,W
btfss STATUS,Z
BRA reset ; Device ID isn't the one we're looking for
;
movlw MTR1_CMD
xorwf CMD,W
btfss STATUS,Z
BRA not_mtr1
is_mtr1:
bcf PINPORT_MTR2
bsf PINPORT_MTR1
BRA wait_reset ; All done
not_mtr1:
movlw MTR2_CMD
xorwf CMD,W
btfss STATUS,Z
BRA not_mtr2 ; Not motor2 code
is_mtr2:
bcf PINPORT_MTR1
bsf PINPORT_MTR2
BRA wait_reset ; All done
not_mtr2:
movfw CMD
xorlw RLY1_CMD
skpz
BRA not_rly1
is_rly1:
movlw ~(RLY_MASK)
andwf PORTIO,F
movlw 1<<PIN_RLY1
xorwf PORTIO,F ; Toggle pin
BRA wait_reset ; All done
not_rly1:
movfw CMD
xorlw RLY2_CMD
skpz
BRA not_rly2
is_rly2:
movlw ~(RLY_MASK)
andwf PORTIO,F
movlw 1<<PIN_RLY2
xorwf PORTIO,F ; Toggle pin
BRA wait_reset ; All done
not_rly2:
movfw CMD
xorlw RLY3_CMD
skpz
BRA not_rly3
is_rly3:
movlw ~(RLY_MASK)
andwf PORTIO,F
movlw 1<<PIN_RLY3
xorwf PORTIO,F ; Toggle pin
BRA wait_reset ; All done
not_rly3:
goto reset
; We got a reasonable length bit, followed by a really long gap, if it's the first bit, then it's a repeat
check_rpt:
movfw ADDRS
iorwf INV_ADDRS,W
iorwf CMD,W
btfss STATUS,Z
BRA wait_count ; Not first bit, we have some others, so reset
movlw 0x01
xorwf CMD,W
btfss STATUS,Z
BRA wait_count ; Not first bit
BRA wait_reset ; Was the first bit, so this was a repeat, leave the outputs as they are
end
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Ttelmah
Joined: 11 Mar 2010
Posts: 19539
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| Posted: Mon May 24, 2021 2:13 am |
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You do realise that this is code to _receive_ the NEC protocol, not to generate
it. |
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Denny9167
Joined: 15 Feb 2021
Posts: 49
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| Posted: Mon May 24, 2021 4:31 am |
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| Ttelmah wrote: | You do realise that this is code to _receive_ the NEC protocol, not to generate
it. |
My apologies, I should have posted under a new thread. |
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Denny9167
Joined: 15 Feb 2021
Posts: 49
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| Posted: Mon May 24, 2021 4:34 am |
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The transmitter code
| Code: |
;**********************************************************************
; BROWN AUDIO LABS *
; PROJECT: 5 button remote control *
; INTERNAL CLOCK: 4Mhz *
; NEC FORMAT @38KHz *
; DEVICE ID = 0xBA *
; CODE = 0x12 *
; CODE = 0x34 *
; CODE = 0x56 *
; CODE = 0x65 *
; CODE = 0x77 *
;**********************************************************************
include "devices_setup(NEC).inc"
; 8-pin DIP 12FXXX/16FXXXXX
; VDD 1 8 VSS
; GP5 2 7 GP0/ICSPDAT
; GP4 3 6 GP1/ICSPCLK
; Vpp/MCLR/GP3 4 5 GP2
;
#define PIN_LED 2 ; pin 2
#define PIN_BUT1 0 ; pin 7
#define PIN_BUT2 1 ; pin 6
#define PIN_BUT3 3 ; pin 4
#define PIN_BUT4 4 ; pin 3
#define PIN_BUT5 5 ; pin 2
#define PINPORT_LED PORTIO,PIN_LED
#define PINPORT_BUT1 PORTIO,PIN_BUT1
#define PINPORT_BUT2 PORTIO,PIN_BUT2
#define PINPORT_BUT3 PORTIO,PIN_BUT3
#define PINPORT_BUT4 PORTIO,PIN_BUT4
#define PINPORT_BUT5 PORTIO,PIN_BUT5
#define TRIS_BITS ((1<<PIN_BUT1)|(1<<PIN_BUT2)|(1<<PIN_BUT3)|(1<<PIN_BUT4)|(1<<PIN_BUT5))
DEVICE_ID equ 0xBA
PIN1_CODE equ 0x10
PIN2_CODE equ 0x20
PIN3_CODE equ 0x30
PIN4_CODE equ 0x40
PIN5_CODE equ 0x50
; ----------------------------------------------------------------------
cblock
TX_BUF:4
DBBUT
endc
; Do single 38KHz cycle, should be 26.3 usec, so 26us is 1.2% low, which is OK, but we tweak via the OSCCAL to run a bit slower
IR_ONOFF macro skip
bcf PINPORT_LED
WAIT_INS (13*INS_PER_USEC)-1 ; 13us high, inc set instruction
bsf PINPORT_LED
WAIT_INS ((13*INS_PER_USEC)-(1+(skip))) ; 13us low, inc clr instruction, and any extras
endm
; Send DEVICE_ID/!DEVICE_ID/W/!W as 32-bit NEC code
send_code
movwf FUNC_TMP1
movlw 352/2 ; 352 cycles of 38KHz = 9ms
movwf FUNC_TMP0
ir_start
IR_ONOFF 0
IR_ONOFF 3
decfsz FUNC_TMP0,F
BRA ir_start
movlw 4632/24 ; 4.5ms gap (=192*24us)
movwf FUNC_TMP0
ir_space
WAIT_INS (24*INS_PER_USEC)-3 ; 24 us per loop
decfsz FUNC_TMP0,F
BRA ir_space
movlw DEVICE_ID
movwf TX_BUF
movlw ~DEVICE_ID
movwf TX_BUF+1
movfw FUNC_TMP1
movwf TX_BUF+2
comf FUNC_TMP1,W
movwf TX_BUF+3
nec_ir_byte
movlw 32
movwf FUNC_TMP2
nec_ir_bit
IR_ONOFF 2
movlw 21
movwf FUNC_TMP0
nec_ir_bit_on
IR_ONOFF 3
decfsz FUNC_TMP0,F
BRA nec_ir_bit_on
rlf TX_BUF+3,F
rlf TX_BUF+2,F
rlf TX_BUF+1,F
rlf TX_BUF+0,F
movlw 3*44-1
btfss STATUS,C
movlw 44-1
movwf FUNC_TMP0
WAIT_INS (13*INS_PER_USEC)-8
nec_ir_bit_off
WAIT_INS (13*INS_PER_USEC)-3 ; 13us per loop
decfsz FUNC_TMP0,F
BRA nec_ir_bit_off
decfsz FUNC_TMP2,F
BRA nec_ir_bit
nec_ir_stop
IR_ONOFF 2
movlw 20
movwf FUNC_TMP0
nec_ir_stop_lp
IR_ONOFF 3
decfsz FUNC_TMP0,F
BRA nec_ir_stop_lp
ir_wait
movlw 80000/2560
movwf FUNC_TMP1
clrf FUNC_TMP0 ; 256*10us=2.56ms
ir_gap
WAIT_INS (10*INS_PER_USEC)-3
decfsz FUNC_TMP0,F
BRA ir_gap
decfsz FUNC_TMP1,F
BRA ir_gap
retlw 0x33
#if 1 ; DEBUG
morse_c
bsf PINPORT_LED
call wait_7_ins ; If off, then does 7+2=9
btfsc STATUS,C ; If on does 7+12=19
call wait_12_ins
bcf PINPORT_LED
retlw 1
#endif
; -----------------------------------------------------------------
#ifdef FEATURE_12BIT
;#define WAKEUP_LABEL main_loop ; 10F2xx don't return after sleep, they reset with special flags in STATUS. Branch here if detected
#endif
STARTUP_CODE
movlw 1<<PIN_LED
movwf PORTIO
main_loop:
btfsc PINPORT_BUT1
BRA not_but1
movlw PIN1_CODE
call send_code
BRA main_loop
not_but1:
btfsc PINPORT_BUT2
BRA not_but2
movlw PIN2_CODE
call send_code
BRA main_loop
not_but2:
btfsc PINPORT_BUT3
BRA not_but3
movlw PIN3_CODE
call send_code
BRA main_loop
not_but3:
btfsc PINPORT_BUT4
BRA not_but4
movlw PIN4_CODE
call send_code
BRA main_loop
not_but4:
btfsc PINPORT_BUT5
BRA no_but5
movlw PIN5_CODE
call send_code
BRA main_loop
no_but5: ; If any buttons down, skip the sleep
movlw TRIS_BITS
andwf PORTIO,W
xorlw TRIS_BITS
btfss STATUS,Z
BRA main_loop
bcf PINPORT_LED ; Should be off, but make sure, otherwise it will kill the battery
sleep ; See Microchip document TB082, Understanding Reset Events On The PIC10F20X (10F2xx will reset, not continue)
nop ; Some other devices will skip the instruction after a sleep, so put a NOP here
BRA main_loop
end
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