Delete pio_SPI.pio

Processors/pio_SPI.pio

-// Raspberry Pi Pico PIO program to output data to a TFT
-// controller via a SPI output data path.
-
-//"Set" set: 1 output pin, TFT_DC
-// Side set: 1 output pin, TFT_SCLK
-// Data set: 1 output pin, TFT_MOSI
-
-.program tft_io
-.side_set 1 opt ;  The TFT_SCLK output.
-
-// The C++ code switches between the 8 bits and 16 bits loops
-// by waiting for the SM to be idle and setting its PC.
-//
-
-// 8 bit transfer
-public start_8:
-   // Pull the next 32 bit value from the TX FIFO. 
-   pull side 0
-   // Lose the top 24 bits, send 1st bit
-   out pins, 25
-   // Now send remaining bits
-   jmp spi_out side 1
-
-public set_addr_window:
-   // Loop count in x for caset, paset and ramwr
-   set x, 2 side 0
-pull_cmd:
-   // Set DC low
-   set pins, 0
-   // Fetch and output LS byte (caset, paset or ramwr), discarding top 24 bits, set WR low
-   pull side 0
-   out pins, 25
-   nop side 1
-next_cmd_bit:
-   out pins, 1 side 0
-   jmp !osre, next_cmd_bit side 1
-   // Set DC high
-   set pins, 1 side 0
-   // Finish if 3rd cmd byte ramwr sent (x == 0)
-   jmp !x, start_tx
-   pull
-next_xy:
-   // send 32 bit start and end coordinates
-   out pins, 1 side 0
-   jmp !osre, next_xy side 1
-   // Loop back for next command
-   jmp x--, pull_cmd side 0
-   // End
-   jmp start_tx
-
-public block_fill:
-   // Fetch colour value
-   pull side 0
-   // Move colour to x
-   mov x, osr
-   // Fetch pixel count
-   pull
-   // Move pixel count to y
-   mov y, osr
-next_16:
-   // Copy colour value back into osr
-   mov osr, x side 0
-   // Lose the top 16 bits, send 1st bit
-   out pins, 17 side 0
-   nop side 1
-next_bit:
-   // Output next 15 colour bits
-   out pins, 1 side 0
-   // Set TFT_SCLK high and jump for next bit
-   jmp !osre, next_bit side 1
-   // Decrement count and loop
-   jmp y--, next_16 side 0
-   // Now drop back to 16 bit output
-
-.wrap_target
-public start_tx:
-   // Pull the next 32 bit value from the TX FIFO. 
-   // Send the bottom 16 bits
-   pull side 0
-   // Drop the first 16 bits, write first bit
-   out pins, 17 side 0
-   nop side 1
-spi_out:
-   // Output the next 15 bits
-   out pins, 1 side 0
-   // Set TFT_SCLK high and jump for next bit
-   jmp !osre, spi_out side 1
-   // Return to start
-.wrap