PIC16F628 infrared receiver
What is the size of the LED display module?
The LED module is divided into two categories. The indoor led module is generally called table stickers (three -in -one table stickers); outdoor and semi -outdoor are generally called modules. The characteristics of indoor table stickers: high image clarity, color and richness, not enough for high prices; outdoor and semi -outdoor module unit board features: high brightness, waterproof, rich color.
;Notes on RC5
;
;14 RC5 bits:
;SSTAAAAACCCCCC
;
;S: 2 start bits, T: 1 toggle bit, A: 5 address bits, C: 6 command bits
;
;Usually both start bits are high. Extended RC5 uses the 2nd start bit for expanding
;the 6 command bits to 7 bits. After receiving a complete 14-bit word, this bit
;is inverted and added as bit 6 to the register 'RC5_CMD'. The toggle bit is
;copied to bit 7 of 'RC5_CMD'. The 5 LSBs of register 'RC5_ADR' contain the
;5 address bits; the 3 MSBs are set to 0.
;Result after a valid code has been received: ;RC5_ADR: 000AAAAA RC5_CMD: TCCCCCCC
;Note that most IR receiver chips (e.g., SFH5110-xx) have an active low output, however, the
;PIC's internal comparator inverts the signal. An inverting driver transistor for the RS232
;interface finally inverts and level shifts the signal again so that the standard LIRC
;configuration (i.e., active low) must be used.
;
;
;PIC16F628 connections
;
;PIN FUNCTION
;
;RB7 ICSP
;RB6 ICSP
;RA5 ICSP
;
; RB5 test output, active high
;RB4 PWRin -- PC switch input active low
;RB3 RESETout -- output transistor redial, active high
;RB2 PWRout -- output transistor for MBATX power on/off, active high
;RB1 LED grn -- output LED green tube, active high
;RB0 LED red -- output LED red tube, active high
;
;RA7 4.000M C crystal
;RA6 4.000M C crystal
;
;RA4 (unused)
;RA3 comparator C1 output -- transistor based drive for RS232 TX
;RA2 (internally connected to Vref = 1.25 volts)
;RA1 ATXin -- comparator C2 inverting input for sensing -5 volts of ATX power supply
;RA0 IRin -- comparator C1 inverting input for IR receiver chip
;
;---Configuration--------------------------------------------- -----------------------------------
;
;PIC16F628, Power-up timer, no watchdog, HS-oscillator, *no* brown-out detect, LVP off, CP off,
;MCLRE off, f=4MHz
List p=16f628
__CONFIG_pwrte_on&_wdt_off&_hs_osc&_boden_off&_lvp_off&_cp_off&_mclre_off
Include
;---Variables[all UPPERCASE]------------------------------------------ -------------------------
cb LOC kh'20'
DATA_1; 16-bit shift register for incoming RC5 bits
DATA_2;
DATA_TMP1; temporary register for RC5 codes
DATA_TMP2; temporary register for RC5 codes
BITCOUNT; counter for the RC5 bits
COUNT; universal temporary count register
TMP; universal temporary registers
TMP1;
TMP2;
RC5_ADR; received RC5 address after cleanup: '000AAAAA'
RC5_CMD; received RC5 command after cleanup: '0CCCCCCC'
RC5_CMD_TMP; temporary register for RC5 command
RC5_CMD_TMP_1; temporary register for RC5 command
KEYCOUNT; counts the incoming RC5 power key packets to set up a delay
KEYCOUNT_1; counts the incoming RC5 0-key packets to set up a delay
RC5_TX_1; 16-bit shift register for outgoing RC5 bits
RC5_TX_2;
EEADR_TMP; holds the EEPROM address when calling the EEPROM write subroutine
EEDATA_TMP; holds the EEPROM data when calling the EEPROM write subroutine
PWR_ON_DELAY; 00...99 (recalled from EEPROM location h'00')
PWR_KEY_ADR; signed RC5 power key address '000AAAAA' (recalled from EEPROM location h'01')
PWR_KEY_CMD; signed RC5 power key command '0CCCCCCC' (recalled from EEPROM location h'02')
D1; temporary registers for delay routines
D2;
D3;
FLAGS; flags, see definitions
Endc
;---EEPROM default data--------------------------------------------- -----------------------------
Org h'2100'
; adr content
De d'45'; h'00' PWR_ON_DELAY
De b'00000101'; h'01' PWR_KEY_ADR
De b'00001100'; h'02' PWR_KEY_CMD
;---Definitions[all Mixed Case]------------------------------------------ -----------------------
#define ATX_C_out cmcon,7; comparator 2 output
#define IRin porta,0; input for IR receiver chip (active low)
#define IRin Tris ISA,0; tris register bit for IRin
#define IR_C_out cmcon,6; comparator 1 output
#define LEDred portb,0; output for bicolor LED red anode
#define LEDgrn portb,1; output for bicolor LED green anode
#define PWRout portb,2; output to drive transistor for MBATX power on/off
#define RESETout portb,3; output to drive transistor for MB reset
#define PWRin portb,4; input for PC power switch
#define TestOut portb,5; debug output for scope
#define TurnOnDelay d'9'; turn on delay when pressing remote power key to
; wake up from standby (9 makes approx. one second)
#define RebootDelay d'15'; additional reboot delay (in seconds)
#define RC5_Flag FLAGS,0; 0: RC_5 code valid, 1: RC_5 code invalid
#define Reboot_Flag FLAGS,1; 0: normal boot delay, 1: additional delay needed
;---Macros[all Mixed Case]------------------------------------------ ----------------------------
Bank_0 macro
Bcf status, 5
Bcf status, 6
Endm
Bank_1 macro
Bsf status, 5
Bcf status, 6
Endm
Test macro
bsf TestOut
bcf TestOut
Endm
LED_red macro
bsf LEDred
bcf LEDgrn
Endm
LED_grn macro
bsf LEDgrn
bcf LEDred
Endm
LED_off macro
bcf LEDred
bcf LEDgrn
Endm
;---Reset--------------------------------------------- -------------------------------------------
Org h'00'
Goto init; reset -> init
;---Interrupt--------------------------------------------- ---------------------------------------
Org h'04'
Goto init; no interrupt
;************************************************* *************************************************
;Initialization
;************************************************* *************************************************
Init
; configuration of porta and portb------------------------------------------------ ----------------
Bank_0
Clrf porta; clear port a register
Clrf portb; clear port b register
Bank_1
MOVlw b'00000111'; RA0...RA2 input, RA3...RA7 output
MOVwf trisa
MOVlw b'00010000'; RB0...RB3 output, RB4 input, RB5...RB7 output
MOVwf trisb
Bcf option_reg,7; enable portb weak pullups
Bank_0
; configuration of analog comparators------------------------------------------------ -------------
MOVlw b'00000110'; two common reference comparators with outputs
MOVwf cmcon
Bank_1
MOVlw b'11100110'; Vref = 1.25 volts, connected to RA2
MOVwf vrcon
Bank_0
; timer0------------------------------------------------ ------------------------------------------
Bank_1
MOVlw b'01000000'; timer0 internal clock, prescaler 1:2, enable portb weak pullups
MOVwf option_reg;
Bank_0
; timer1------------------------------------------------ ------------------------------------------
MOVlw b'00110001'; prescaler = 8, internal clock, enabled
MOVwf t1con
;************************************************* *************************************************
;Main program
;************************************************* *************************************************
Start
clrf FLAGS; clear all flags
Call copy_ee; copy default eeprom values to RAM registers
Main_loop
btfsc ATX_C_out; check if ATX is standby
Goto green; on -> LED green
LED_red; standby -> LED red
Goto pwr_sw
Green
LED_grn
Pwr_sw
btfss PWRin; test PWRin (active low)
Goto pwr_sw_1; if low, go to pwr_sw_1
btfss IR_C_out; wait for high level at IR_C_out
Goto main_loop;
Call rc5_rx; call rc5_rx subroutine
btfsc RC5_Flag; RC5 code OK?
Goto main_loop; no, go to main_loop
LED_off; turn off green LED for 50ms each time a valid code
Call delay_t4; has been received
LED_grn
Pwr_key; check if power key of remote control is pressed
MOVfw RC5_ADR; load RC5_ADR into w
subwf PWR_KEY_ADR, w;
Btfss status, z; do PWR_KEY_ADR match?
Goto no_match; -no, go to no_match
;
MOVfw RC5_CMD; -yes, load RC5_CMD into w
Andlw b'01111111'; and clear toggle bit
subwf PWR_KEY_CMD, w;
Btfss status, z; do PWR_KEY_CMD match?
Goto no_match; -no, go to no_match
;
MOVfw RC5_CMD_TMP; -yes, toggle bit also unchanged?
subwf RC5_CMD, w;
Btfss status, z;
Goto no_match; -no, go to no_match
;
btfsc ATX_C_out; activate PWRout only if ATX is standby to power up PC
Goto vdr_pwr_down; if on, VDR's shutdown script will turn off PC
; ATX is standby, now check if power key of remote control is
; pressed long enough (approx. TurnOnDelay * 114ms)
incf KEYCOUNT, f; -yes, unchanged, increment KEYCOUNT
MOVfw KEYCOUNT;
sublw TurnOnDelay; if reached TurnOnDelay, activate PWRout
Btfss status, z
Goto cont
bsf PWRout; activate PWRout for 250ms
Call delay_t6
bcf PWRout
Goto boot_delay; and go to boot_delay
No_match
clrf KEYCOUNT; clear KEYCOUNT
Cont
MOVfw RC5_CMD; copy RC5_CMD to temporary register
MOVwf RC5_CMD_TMP; for ext toggle bit comparison
Zero_key; check if 0 key on remote control is pressed
; at least 44 * 114ms (RC5 code repetition rate) = approx. 5s
MOVfw RC5_CMD; load RC5_CMD into w
Andlw b'01111111'; and clear toggle bit
Btfss status, z; does O key (command '0000000', any address) match?
Goto no_match_1;
MOVfw RC5_CMD_TMP_1; toggle bit also unchanged?
subwf RC5_CMD, w;
Btfss status, z;
Goto no_match_1; -no, has changed
incf KEYCOUNT_1, f; -yes, unchanged, increment KEYCOUNT_1
MOVfw KEYCOUNT_1;
Sublw d'44';
Btfss status, z; reached 44 (approx. 5s)?
Goto cont_1; -no, loop
Goto pgm_or_reboot; -yes, go to pgm_or_reboot
No_match_1
clrf KEYCOUNT_1; clear KEYCOUNT_1
Cont_1
MOVfw RC5_CMD; copy RC5_CMD to temporary register
MOVwf RC5_CMD_TMP_1; for next toggle bit comparison
Goto main_loop
Pgm_or_reboot
btfss ATX_C_out
Goto pgm_mode; PC is in standby -> enable program mode
LED_red; turn LED red to indicate that reboot has been initialized
MOVlw h'1f'; set address to h'1f'
MOVwf RC5_TX_2;
MOVlw h'3f'; set command to h'3f'
MOVwf RC5_TX_1; This combination is not used by the remote control. Suitable
; entries in lircd.conf and lircrc call reboot script via irexec
Call rc5_tx
bsf Reboot_Flag; set Reboot_flag so that additional delay for green LED flashing
Goto boot_delay; will be added and go to boot_delay
;------------------------------------------------- -----------------------------------------------
Pwr_sw_1; checks if power switch of PC is pressed for less or more than
; 5 seconds: if less -> power on/off, if more -> reset
Call delay_t4; 50ms delay
btfsc PWRin; still low after 50ms?
Goto main_loop; if not, assumes spike and go to main_loop
btfss ATX_C_out; ATX on or standby?
Goto turn_on; standby, a reset would be quite useless, so turn on VDR
Clrf tmr1h; clear timer1 registers
Clrf tmr1l;
MOVlw d'19'; set COUNT to d'19', this makes approx. 19 * 262ms = 5 seconds
MOVwf COUNT;
Chk_low
btfsc PWRin; still low?
Goto vdr_pwr_down; if not, pwr key was pressed <5s -> turn off VDR
Btfsctmr1h,7; check timer1h register bit7 (set after 262ms)
Goto dec_cnt1
Goto chck_low
Dec_cnt1
Clrf tmr1h; clear timer1 registers
Clrf tmr1l
decfsz COUNT, f
Goto chck_low; not yet 5s, loop
Goto setet; power key pressed >5s
Turn_on
bsf PWRout; activate PWRout for 250ms
Call delay_t6;
bcf PWRout;
Goto boot_delay; and go to boot_delay
Reset bsf RESETout; activate RESETout for 250ms
Call delay_t6
Bcf RESETout
Boot_delay; variable delay from 0 to 127s while LED is flashing green
MOVfw PWR_ON_DELAY; and no command is accepted, delay derived from user preset (0..99)
btfsc Reboot_Flag; add additional time (defined in RebootDelay) if Reboot_Flag is set
addlw RebootDelay;
MOVwf COUNT
Bcf status, c
Rlf COUNT; multiply COUNT by two as the g_flash routine takes only 0.5s
Sublw d'0'; if COUNT = 0 stop immediately
Btfss status, z
Goto g_flash
bcf Reboot_Flag; clear Reboot_Flag
Goto main_loop
G_flash
LED_grn
Call delay_t6
LED_off
Call delay_t6
decfsz COUNT, f
Goto g_flash
Goto main_loop
Vdr_pwr_down
LED_red; turn LED red
MOVlw h'1f'; set RC5 address to h'1f' and command to h'3e' and send the code
MOVwf RC5_TX_2; This combination is not used by the remote control and will
MOVlw h'3e'; be sent to LIRC instead of the remote's normal power key code.
MOVwf RC5_TX_1; This way exactly *one* command can be sent instead of multiple
; (auto repeat of RC5 codes) -- VDR would start and immediately
; abort the shutdown if the power key is pressed a bit too long...
; A corresponding entry must be added to lircd.conf and the
; original power key code must be removed.
Call rc5_tx;
; Flash red LED while checking if a key on the remote control is
; pressed (which stops VDR from executing the shutdown script).
; If so, the program returns to the main loop and the LED
; turns green again. Otherwise, flash LED until ATX is in standby
; and finally turn LED red. Note: The remote's power key will be
; ignored (also to avoid problems with RC5/repeat and VDR).
MOVlw d'57'; set COUNT to d'57' for timeout counter
MOVwf COUNT; timeout is approx. 2 * 262ms * 57 = 30 seconds
R_flash
LED_red; turn on red LED
Call tim_sub; call timer subroutine and check if any remote key is pressed
LED_off; turn off LED
Call tim_sub; call timer subroutine and check if any remote key is pressed
decfsz COUNT, f
Goto r_flash; and loop
Goto main_loop; timeout after approx. 30 seconds (if shutdown fails)
Tim_sub;
Clrf tmr1h; clear timer1 registers
Clrf tmr1l;
Ir_chk
btfss IR_C_out; high level at IR?
Goto tim_chk; -no, check timer1
Call rc5_rx; -yes, call rc5_rx subroutine
btfsc RC5_Flag; RC5 code OK?
Goto tim_chk; -no, check timer1
MOVfw RC5_CMD; copy RC5_CMD to w and
Andlw b'01111111'; clear toggle bit
Bcf status, c; clear carry bit
subwf PWR_KEY_CMD, w; check if command is power key; this will be ignored
Btfss status, z;
Goto main_loop; key pressed, abort shutdown and go to main_loop
Tim_chk;
Btfsctmr1h,7; check timer1h register bit7 (set after 262ms)
Goto ir_chk; loop if not yet set
Atx_chk
btfsc ATX_C_out; wait until ATX is standby
Return; still on, continue flashing
Goto main_loop; now standby, go to main_loop
;************************************************* *************************************************
;Program mode
;************************************************* *************************************************
Pgm_mode
MOVlw d'4'
MOVwf COUNT
Rg_flash
LED_red; flash bicolor LED alternately green/red
Call delay_t6; (either for 250ms) 4 times to indicate
LED_grn; that the program mode has been entered
Call delay_t6
decfsz COUNT
Goto rg_flash
LED_off; now ready to learn codes (LED off)
Learn_1
Call ir_chk1; wait for high level at IR_C_out, timeout if idle for >5s
Call rc5_rx; call rc5_rx subroutine
btfsc RC5_Flag; RC5 code OK?
Goto learn_1; no, try again
MOVfw RC5_CMD; copy RC5_CMD to w and
Andlw b'01111111'; clear toggle bit
MOVwf TMP1; copy to TMP1 and TMP2
MOVwf TMP2;
Bsf status, c; check if command is 0...9
Sublw d'9'
Btfss status, c
Goto learn_1; no, try again
LED_grn; turn on green LED for 250ms if a
Call delay_t6; valid code has been received
LED_off
MOVfw RC5_CMD; copy RC5_CMD to temporary register
MOVwf RC5_CMD_TMP; for the next toggle bit comparison
Bcf status, c; multiply TMP1 by 10
rlf TMP1, f; for 10's of PWR_ON_DELAY
rlf TMP1, f
rlf TMP1, f
MOVfw TMP2
addwf TMP1, f
addwf TMP1, f
Learn_2
Call ir_chk1; wait for high level at IR_C_out, timeout if idle for >5s
Call rc5_rx; call rc5_rx subroutine
btfsc RC5_Flag; RC5 code OK?
Goto learn_2; no, try again
MOVfw RC5_CMD; check if toggle bit has changed
subwf RC5_CMD_TMP, w;
Btfsc status, z;
Goto learn_2; no, try again
MOVfw RC5_CMD; copy RC5_CMD to w and
Andlw b'01111111'; clear toggle bit
MOVwf TMP2; copy to TMP2
Bsf status, c; check if command is 0...9
Sublw d'9';
Btfss status, c;
Goto learn_2; no, try again
MOVfw TMP1; add 10's and 1's
addwf TMP2, w;
MOVwf EEDATA_TMP; copy to EEDATA_TMP
MOVlw h'00'; set EEADR_TMP to h'00'
MOVwf EEADR_TMP;
Call write_ee; and write to EEPROM
LED_grn; turn on green LED for 250ms if a
Call delay_t6; valid code has been received
LED_off
MOVfw RC5_CMD; copy RC5_CMD to temporary register
MOVwf RC5_CMD_TMP; for the next toggle bit comparison
Learn_3
Call ir_chk1; wait for high level at IR_C_out, timeout if idle for >5s
Call rc5_rx; call rc5_rx subroutine
btfsc RC5_Flag; RC5 code OK?
Goto learn_3; no, try again
MOVfw RC5_CMD; check if toggle bit has changed
subwf RC5_CMD_TMP, w;
Btfsc status, z;
Goto learn_3; no, try again
MOVfw RC5_CMD; copy RC5_CMD to w and
Andlw b'01111111'; clear toggle bit
Bcf status, c; check if command is 0...9
Sublw d'9'; which cannot be assigned
Btfsc status, c; as power key
Goto learn_3; yes, try again
MOVfw RC5_ADR
MOVwf EEDATA_TMP; copy to EEDATA_TMP
MOVlw h'01'; set EEADR_TMP to h'01'
MOVwf EEADR_TMP;
Call write_ee; and write to EEPROM
MOVfw RC5_CMD; copy RC5_CMD to w and
Andlw b'01111111'; clear toggle bit
MOVwf EEDATA_TMP; copy to EEDATA_TMP
MOVlw h'02'; set EEADR_TMP to h'02'
MOVwf EEADR_TMP;
Call write_ee; and write to EEPROM
Call copy_ee; copy new values to RAM
LED_grn; turn on green LED for 250ms to indicate
Call delay_t6; that a valid code has been received
LED_off
clrf KEYCOUNT_1; clear KEYCOUNT_1 to reset zero key detection delay
Goto main_loop
Ir_chk1; wait for high level at IR_C_out, timeout if idle for >5s
Clrf tmr1h; clear timer1 registers
Clrf tmr1l
MOVlw d'19'; set COUNT to d'19', this makes 19 x 262ms = approx. 5 seconds
MOVwf COUNT
Ir_chk2
btfsc IR_C_out; wait for high level at IR_C_out
Return; and return
Btfsctmr1h,7; check timer1h register bit7 (set after 262ms)
Goto dec_cnt
Goto ir_chk2
Dec_cnt
Clrf tmr1h; clear timer1 registers
Clrf tmr1l
decfsz COUNT, f
Goto ir_chk2; not yet 5s, loop
clrf KEYCOUNT_1; clear KEYCOUNT_1 to reset zero key detection delay
Goto main_loop; timeout after approx. 5s
;************************************************* *************************************************
;RC5 transmit subroutine
;************************************************* *************************************************
Rc5_tx; we have: RC5 address '000AAAAA' and command '0CCCCCCC'
bsf RC5_TX_2,7; set 1st start bit
btfss RC5_TX_1,6; check command bit #6 and
bsf RC5_TX_2,6; set 2nd start bit if necessary
Bcf status, c; clear carry bit
rlf RC5_TX_1; left shift RC5_TX_1 twice to bring command MSB to
Bcf status, c; left-most position
rlf RC5_TX_1; now the 16-bit shift register is ready for
; shifting out: RC5_TX_2 1S0 AAAA ARC5_TX_1 CCCCCC 00
bsf IRin; set port register bit IRin high before setting to output
Bank_1; to avoid a 1ç¥ spike
bcf IRinTris; set IRin as output
Bank_0;
Call delay_t6; 250ms delay for time coupling (LIRC might still be busy with
; processing IR codes from the receiver and would not react to the
; code generated below)
MOVlw d'14'; set BITCOUNT to 14
MOVwf BITCOUNT;
Bit_test
btfss RC5_TX_2,7; test all bits
Goto out_low_high; remember that we have to invert them
Out_high_low
bsf IRin; output a high-low sequence at IRin
Call delay_t5; either state is 889ç¥
bcf IRin;
Call delay_t5;
Goto next_bit; go to next_bit
Out_low_high
bcf IRin; output a low-high sequence at IRin
Call delay_t5; either state is 889ç¥
bsf IRin;
Call delay_t5;
Next_bit
rlf RC5_TX_1; left shift the 16-bit register
rlf RC5_TX_2;
decfsz BITCOUNT; until all 14 bits are out
Goto bit_test;
btfss IRin; if the last bit was a high-low sequence, immediately set IRin
bsf IRin; high to terminate the RC5 code after the correct time
Call delay_t6; 250ms delay for time coupling (IR codes from the receiver chip
; occurring only after the code generated above would destroy
; the integrity of this code)
Bank_1
bsf IRinTris; set IRin back to input
Bank_0
Return
;************************************************* *************************************************
;RC5 receive routine
;************************************************* *************************************************
;
; in: 14-bit data from IRin resp. DTRin
;
; out: RC5_ADR (8-bit, 000AAAAA)
; RC5_CMD (8-bit, TCCCCCCC)
; RC5_Flag (1-bit) 0: RC5 code valid, 1: RC5 code invalid
;
; Self-synchronizing code which tolerates inaccurate RC5 timings.
; Tolerance is achieved by polling +/- approx. 250ç¥ around each expected level change. To mark the
; received code as valid, the level before and after the edges must be opposite, not timer0 overflow
; (512ç¥) occurred, and two samples taken at 1200ç¥ and 1500ç¥ after each edge must be equal.
Rc5_rx
Clrf DATA_1; clear input shift register
Clrf DATA_2;
MOVlw d'13'; set BITCOUNT to 13
MOVwf BITCOUNT;
Test; 1ç¥ mark
Call delay_t1a; 1
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