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Delete pio_16bit_parallel.pio
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// Raspberry Pi Pico PIO program to output data to a TFT
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// controller via a 16 bit 8080 style data path.
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// Original sourced from:
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// https://github.com/zapta/pio_tft
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// Side set: 1 output pin, TFT_WR. Active low.
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// Data set: 16 consecutive output pins, TFT_D0 .. TFT_D15
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.program tft_io
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.side_set 1 opt ; The TFT_WR output.
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// The C++ code switches between the different SM routines
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// by waiting for the SM to be idle and setting its PC.
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// The default SM routine is a 16 bit transfer
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// Do a block fill of N+1 pixels.
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public block_fill:
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// Fetch colour value.
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pull side 1
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// Move colour to x.
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mov x, osr
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// Fetch pixel count N (sends N+1 pixels).
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pull
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// Move pixel count to y.
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mov y, osr
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next:
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// Copy colour value into osr, colour in LS 16 bits.
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mov osr, x side 1
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// Output colour 16 bits, unwanted top 16 bits shifted through.
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out pins, 32 side 0 [1]
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// Decrement pixel count and loop.
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jmp y--, next side 1
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.wrap_target
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// Transmit an 8 bit value (LS 8 bits of 32 bits).
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public start_8:
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// Transmit a 16 bit value (LS 16 bits of 32 bits).
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public start_tx:
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// Fetch the next 32 bit value from the TX FIFO and set TFT_WR high.
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pull side 1
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// Write the 16 bits and set WR low. This also
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// shifts the unused top 16 bits through.
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out pins, 32 side 0 [1]
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// Set WR high and jump back to start.
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jmp start_tx side 1
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// Transmit a set window command sequence.
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public set_addr_window:
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// Loop count in x (to send caset, paset and ramwr commands).
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set x, 2 side 1
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pull_cmd:
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// Set TFT_DC low.
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set pins, 0
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// Fetch caset, paset or ramwr.
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pull
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// Output LS byte (caset, paset or ramwr), discarding top 16 bits, set TFT_WR low.
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out pins, 32 side 0
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// Jump to end if 3rd cmd byte ramwr sent (x == 0)
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jmp !x, end_set_addr
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// pull next start and end coordinates, TFT_WR high.
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pull side 1
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// Set TFT_DC high.
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set pins, 1
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send_xy:
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// Output byte, TFT_WR low.
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out pins, 8 side 0 [1]
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// Loop until 4 bytes sent, TFT_WR high.
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jmp !osre, send_xy side 1 [1]
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end_set_addr: // Jump here since delay needed before DC change
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// Loop back for next command and write last command.
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jmp x--, pull_cmd side 1
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// Set DC high.
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set pins, 1
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// Auto-wrap back to start_tx.
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.wrap
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