Bodmer/TFT_eSPI
1
0
Fork 1
mirror of https://github.com/Bodmer/TFT_eSPI.git synced 2025-08-03 20:54:42 +02:00
Code Issues Packages Projects Releases Wiki Activity

Delete pio_SPI_18bit.pio

Browse Source
This commit is contained in:
Bodmer
2022-10-12 21:58:57 +01:00
committed by GitHub
parent b2e0bd855c
commit 8b454bc19d
1 changed files with 0 additions and 89 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
Processors/pio_SPI_18bit.pio
View File

@@ -1,89 +0,0 @@
// Raspberry Pi Pico PIO program to output 18 bit 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 8 bits, send 1st bit
out pins, 9 side 0
nop side 1
next_bit:
// Output next remaining 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 24 bits
pull side 0
// Drop the first 8 bits, write first bit
out pins, 9 side 0
nop side 1
spi_out:
// Output the remaining 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