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Figure 21.28 Test circuit for better operation of the PIC microcontroller IR receiver application code.
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goto Loop movlw subwf btfsc goto movf clrf clrf call 200 ReadCount, w STATUS, Z Loop_Reset ReadCount, w IntCount ReadCount DispHex
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Has NOT timed out Can we Display
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Reset the Count Values Now, Display what was read in Clear the Display Values
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movlw 0x08E call WriteINS goto Loop
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Wait for the Next Loop Around
Loop_Reset: clrf clrf goto IntCount ReadCount Loop ; Reset the Values
Int: movwf _w swapf STATUS, w movwf _status bcf incf INTCON, T0IF IntCount
Interrupt, Check I/R Input Save the Context Registers
; ; ;
Clear the Timer Interrupt Increment the Count Register Increment the Read Value
btfsc PORTB, 6 incf ReadCount movlw 256 - 25 movwf TMR0 swapf movwf swapf swapf ret e _status, w STATUS _w _w, w
Reset the Timer
Restore the Context Registers
PROJECTS
This code simply counts the number of ones and stores the result in ReadCount for a given amount of time. The theory behind this method of sampling was that the dead space between packets would be read along with the data, and the result would combine them. The actual value returned from the program wasn t very repeatable (as was expected). For example, ve tries with the 1 key from a universal remote programmed with Sony codes produced these results:
0x09F 0x09D 0x08C 0x09D 0x09D
Generally, the results from this program were repeatable about 60 percent of the time. This might have been acceptable except for the poor discrimination that this method had. For example, the codes for 2 and 3 are 0x081 and 0x082, respectively. The problem lies in the fact that the two codes have the same number of ones and zeros. The code may pick up the differences, but I didn t nd this to be the case. Thus the code for reading the IR packet was changed to
clrf clrf IntCount ReadCount ; Reset the Counters
GetPack: movlw 0x088 movwf INTCON Loop: movlw subwf btfss goto clrf movf clrf clrf call 150 IntCount, w STATUS, Z Loop INTCON ReadCount, w IntCount ReadCount DispHex
Get the Next Packet Coming In Wait for Port Change Interrupt
Loop Here for Each Update of Screen Wait for 25 msec of Data from I/R
; ; ; ;
Has NOT timed out No more interrupts for a while Get the Read in CRC Reset for the Next Packet
Now, Display the Character Reset the Cursor
movlw 0x08E call WriteINS
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goto Int:
GetPack
; ; ;
Wait for the Next I/R Packet Interrupt, Check I/R Input Save the Context Registers
movwf _w swapf STATUS, w movwf _status movlw 0x020 movwf INTCON movlw 256 - 20 movwf TMR0 incf IntCount
Just wait for a Timer Interrupt
Reset the Timer
; ; ;
Increment the Count Register Now, Figure out what to Add to Is the Incoming Value Set
bcf STATUS, C LSB btfsc PORTB, 6 goto Int_Set btfsc ReadCount, 5 bsf STATUS, C goto Int_End
Do we Update the Value coming in
Int_Set: btfss ReadCount, 5 bsf STATUS, C Int_End: rlf swapf movwf swapf swapf ret e ReadCount _status, w STATUS _w _w, w
; ; ;
Incoming Set Is the Current Bit Set No, Turn on the Incoming Bit
Shift Over with New Input Data Restore the Context Registers
which can be found as IRLCD_3. The fundamental changes were that the sampling started after the leader was received, and the 1s and 0s were treated as the inputs to a linear feedback shift register. Elsewhere in this book I have discussed how linear feedback shift registers work. For the preceding code, an 8-bit LFSR was used to produce cyclical redundancy check (CRC) codes. In this case, the input isn t the high bit of the shift register instead, it is the input from the IR receiver. Using this code, the CRC codes listed in Table 21.11 were generated from the Sony IR transmitter.
PROJECTS
TABLE 21.11 IMPROVED IR TANK Read ALGORITHM RESULTS KEY CRC CODE
Power Vol Vol Ch 0 1 2 3 4 5 6 7 8 9
0x52 0x5E 0xBB 0xDC 0x17 0x7A 0x8D 0x33 0x1F 0x4E 0x72 0xCC 0xB9 0x23
The interrupt handler code waits for a port change interrupt (the IR line going low from its nominal state of 1), and once that happens, the line is sampled every 200 s, and a CRC is generated from each sample. After 150 samples (30 ms), the CRC is output serially in hex format (i.e., sending the high nybble followed by the low one). The CRC generated is rock solid (none of the 60 percent repeatability I had with just sampling bits). I don t know if I m going to go back and update my IR robot code (lack of initiative more than anything else), but this is clearly a much more elegant and robust method of handling IR codes. I did a limited amount of checking for invalid code rejection by reprogramming my universal remote with Panasonic and RCA codes. The CRCs generated were different from the Sony ones shown earlier. I was never pleased with the XORing used to create the CRC in the preceding code. I felt that it was too confusing to understand. After some thought, I came up with the idea that if I used the same bit number for the PORT input bit as the CRC tap, I could simplify the CRC generator (from bcf STATUS, C to rlf ReadCount above) to
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