38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
.define bit_to_recv 32
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.program dht
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; Clock must be set for 1µs per instruction
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set pindirs, 1 ; set pin as output
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set pins, 1 ; set pin to high
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pull block ; Wait for start
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set x, 31 ; set x register with 31 (for 31 * 32 µS)
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set pins, 0 ; set pin to low
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loop_init_low: ; wait 992 µs
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jmp x-- loop_init_low [31]
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set pins, 1 [19] ; set pin to high (for 20µS)
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set pindirs, 0 ; set pin as input
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wait 0 pin 0 ; Wait for low
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wait 1 pin 0 ; wait for high
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set y, 4 ; set the number of byte to receive - 1
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init_loop_data:
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set x, 7 ; Set number bit to receive - 1
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loop_data:
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wait 0 pin 0 ; Wait for low
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wait 1 pin 0 ; wait for high
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nop [29] ; wait for ~ 30 µS
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nop [9] ; wait for ~ 10 µS
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in pins, 1 ; read the pin state and store bit value
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jmp x--, loop_data ; Loop while there are bits left to read
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push iffull noblock ; Push data if full
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jmp y--, init_loop_data
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push ; Push the last bytes
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