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// SPDX-FileCopyrightText: 2023 P Burgess for Adafruit Industries
//
// SPDX-License-Identifier: BSD-3-Clause
/*!
* @file PicoDVI.cpp
*
* Arduino-and-Adafruit-GFX wrapper around Luke Wren's PicoDVI library.
*/
#include "PicoDVI.h"
#include "libdvi/tmds_encode.h"
// PicoDVI class encapsulates some of the libdvi functionality -------------
// Subclasses then implement specific display types.
static struct {
const dvi_timing &timing;
vreg_voltage v;
uint16_t width;
uint16_t height;
uint8_t v_rep;
} dvispec[] = {
{dvi_timing_640x480p_60hz, VREG_VOLTAGE_1_20, 320, 240, 2},
{dvi_timing_800x480p_60hz, VREG_VOLTAGE_1_20, 400, 240, 2},
{dvi_timing_640x480p_60hz, VREG_VOLTAGE_1_20, 640, 480, 1},
{dvi_timing_800x480p_60hz, VREG_VOLTAGE_1_20, 800, 480, 1},
{dvi_timing_640x480p_60hz, VREG_VOLTAGE_1_20, 640, 240, 2},
{dvi_timing_800x480p_60hz, VREG_VOLTAGE_1_20, 800, 240, 2},
// Additional resolutions might get added here if the overclock issue can
// be sorted out. Regardless, always keep this list 1:1 in sync with the
// DVIresolution enum in PicoDVI.h.
{dvi_timing_1280x720p_30hz, VREG_VOLTAGE_1_30, 1280, 720, 1},
};
static PicoDVI *dviptr = NULL; // For C access to active C++ object
/*!
@brief Runs on core 1 on startup; this is how Philhower RP2040 handles
multiprocessing.
*/
void setup1(void) {
while (dviptr == NULL) // Wait for PicoDVI::begin() to start on core 0
yield();
dviptr->_setup();
}
// Runs on core 1 after dviptr set
void PicoDVI::_setup(void) {
while (wait_begin)
; // Wait for DVIGFX*::begin() to set this
dvi_register_irqs_this_core(&dvi0, DMA_IRQ_0);
dvi_start(&dvi0);
(*mainloop)(&dvi0);
}
PicoDVI::PicoDVI(const struct dvi_timing &t, const struct dvi_serialiser_cfg &c,
vreg_voltage v)
: voltage(v) {
dvi0.timing = &t;
memcpy(&dvi0.ser_cfg, &c, sizeof dvi0.ser_cfg);
};
PicoDVI::~PicoDVI(void) { dviptr = NULL; }
void PicoDVI::begin(void) {
dviptr = this;
vreg_set_voltage(voltage);
delay(10);
set_sys_clock_khz(dvi0.timing->bit_clk_khz, true); // Run at TMDS bit clock
dvi_init(&dvi0, next_striped_spin_lock_num(), next_striped_spin_lock_num());
}
// DVIGFX16 class provides GFX-compatible 16-bit color framebuffer ---------
static void *gfxptr = NULL; // For C access to active C++ object
DVIGFX16::DVIGFX16(const DVIresolution r, const struct dvi_serialiser_cfg &c,
vreg_voltage v)
: PicoDVI(dvispec[r].timing, c, v),
GFXcanvas16(dvispec[r].width, dvispec[r].height) {
dvi_vertical_repeat = dvispec[r].v_rep;
dvi_monochrome_tmds = false;
}
DVIGFX16::~DVIGFX16(void) { gfxptr = NULL; }
static void scanline_callback_GFX16(void) {
((DVIGFX16 *)gfxptr)->_scanline_callback();
}
void DVIGFX16::_scanline_callback(void) {
// Discard any scanline pointers passed back
uint16_t *bufptr;
while (queue_try_remove_u32(&dvi0.q_colour_free, &bufptr))
;
bufptr = &getBuffer()[WIDTH * scanline];
queue_add_blocking_u32(&dvi0.q_colour_valid, &bufptr);
scanline = (scanline + 1) % HEIGHT;
}
bool DVIGFX16::begin(void) {
uint16_t *bufptr = getBuffer();
if ((bufptr)) {
gfxptr = this;
mainloop = dvi_scanbuf_main_16bpp; // in libdvi
dvi0.scanline_callback = scanline_callback_GFX16;
PicoDVI::begin();
queue_add_blocking_u32(&dvi0.q_colour_valid, &bufptr);
bufptr += WIDTH;
queue_add_blocking_u32(&dvi0.q_colour_valid, &bufptr);
wait_begin = false; // Set core 1 in motion
return true;
}
return false;
}
// DVIGFX8 (8-bit, color-indexed framebuffer) is all manner of dirty pool.
// PicoDVI seems to have some palette support but I couldn't grasp the DMA
// stuff going on, so just doing a brute force thing here for now: in
// addition to the 8-bit framebuffer, two 16-bit (RGB565) scanlines are
// allocated...then, in the scanline callback, pixels are mapped from the
// 8-bit framebuffer through the palette into one of these buffers, allowing
// use of the same dvi_scanbuf_main_16bpp handler as DVIGFX16 above. Not
// optimal, sure...but not pessimal either. The allocation of those 16-bit
// scanlines is weird(tm) though. Rather than a separate malloc (which
// creates a nasty can of worms if that fails after a successful framebuffer
// allocation...unlikely but not impossible), the framebuffer size is
// tweaked so that W*H is always an even number, plus 4 extra rows are
// added: thus two 16-bit scanlines, word-aligned. That extra memory is for
// us, but allocated by GFX as part of the framebuffer all at once. The
// HEIGHT value is de-tweaked to the original value so clipping won't allow
// any drawing operations to spill into the 16-bit scanlines.
// This requires latest Adafruit_GFX as double-buffered mode plays games with
// the canvas pointer, wasn't possible until that was made protected (vs
// private). Drawing and palette-setting operations ONLY apply to the "back"
// state. Call swap() to switch the front/back buffers at the next vertical
// sync, for flicker-free and tear-free animation.
DVIGFX8::DVIGFX8(const DVIresolution r, const bool d,
const struct dvi_serialiser_cfg &c, vreg_voltage v)
: PicoDVI(dvispec[r].timing, c, v),
GFXcanvas8(
dvispec[r].width,
(d ? (dvispec[r].height * 2) : ((dvispec[r].height + 1) & ~1)) + 4),
dbuf(d) {
HEIGHT = _height = dvispec[r].height;
buffer_save = buffer;
dvi_vertical_repeat = dvispec[r].v_rep;
dvi_monochrome_tmds = false;
}
DVIGFX8::~DVIGFX8(void) {
buffer = buffer_save; // Restore pointer so canvas destructor works
gfxptr = NULL;
}
static void __not_in_flash_func(scanline_callback_GFX8)(void) {
((DVIGFX8 *)gfxptr)->_scanline_callback();
}
void __not_in_flash_func(DVIGFX8::_scanline_callback)(void) {
uint16_t *b16;
while (queue_try_remove_u32(&dvi0.q_colour_free, &b16))
; // Discard returned pointer(s)
b16 = row565[rowidx]; // Next row to send
queue_add_blocking_u32(&dvi0.q_colour_valid, &b16); // Send it
if (++scanline >= HEIGHT) { // Next scanline...end of screen reached?
if (swap_wait) { // Swap buffers?
back_index = 1 - back_index; // Yes plz
buffer = buffer_save + WIDTH * HEIGHT * back_index;
swap_wait = 0;
}
scanline = 0;
}
// Refresh from front buffer
uint8_t *b8 = buffer_save + WIDTH * scanline; // New src
if (dbuf)
b8 += WIDTH * HEIGHT * (1 - back_index);
rowidx = (rowidx + 1) & 1; // Swap row565[] bufs
b16 = row565[rowidx]; // New dest
uint16_t *p16 = dbuf ? palette[1 - back_index] : palette[0];
for (int i = 0; i < WIDTH; i++)
b16[i] = p16[b8[i]];
}
bool DVIGFX8::begin(void) {
uint8_t *bufptr = getBuffer();
if ((bufptr)) {
gfxptr = this;
row565[0] = (uint16_t *)&bufptr[dbuf ? WIDTH * HEIGHT * 2
: (WIDTH * HEIGHT + 1) & ~1];
row565[1] = row565[0] + WIDTH;
memset(palette, 0, sizeof palette);
// mainloop = mainloop8;
mainloop = dvi_scanbuf_main_16bpp; // in libdvi
dvi0.scanline_callback = scanline_callback_GFX8;
PicoDVI::begin();
// No need to initialize the row565 buffer contents as that memory is
// cleared on canvas alloc, and the initial palette state is also all 0.
uint16_t *b16 = row565[0];
queue_add_blocking_u32(&dvi0.q_colour_valid, &b16);
b16 = row565[1];
queue_add_blocking_u32(&dvi0.q_colour_valid, &b16);
wait_begin = false; // Set core 1 in motion
return true;
}
return false;
}
void DVIGFX8::swap(bool copy_framebuffer, bool copy_palette) {
if (dbuf) {
// Request buffer swap at next frame end, wait for it to happen.
for (swap_wait = 1; swap_wait;)
;
if ((copy_framebuffer)) {
uint32_t bufsize = WIDTH * HEIGHT;
memcpy(buffer_save + bufsize * back_index,
buffer_save + bufsize * (1 - back_index), bufsize);
}
if ((copy_palette)) {
memcpy(palette[back_index], palette[1 - back_index], sizeof(palette[0]));
}
}
}
DVIGFX1::DVIGFX1(const DVIresolution r, const bool d,
const struct dvi_serialiser_cfg &c, vreg_voltage v)
: PicoDVI(dvispec[r].timing, c, v),
GFXcanvas1(dvispec[r].width,
d ? (dvispec[r].height * 2) : dvispec[r].height),
dbuf(d) {
dvi_vertical_repeat = dvispec[r].v_rep;
dvi_monochrome_tmds = true;
HEIGHT = _height = dvispec[r].height;
buffer_save = buffer;
}
DVIGFX1::~DVIGFX1(void) {
buffer = buffer_save; // Restore pointer so canvas destructor works
gfxptr = NULL;
}
static void mainloop1(struct dvi_inst *inst) {
((DVIGFX1 *)gfxptr)->_mainloop();
}
void __not_in_flash_func(DVIGFX1::_mainloop)(void) {
for (;;) {
uint8_t *b8 = buffer_save;
if (dbuf)
b8 += ((WIDTH + 7) / 8) * HEIGHT * (1 - back_index);
for (int y = 0; y < HEIGHT; y++) {
const uint32_t *colourbuf =
(const uint32_t *)(b8 + y * ((WIDTH + 7) / 8));
uint32_t *tmdsbuf;
queue_remove_blocking_u32(&dvi0.q_tmds_free, &tmdsbuf);
tmds_encode_1bpp(colourbuf, tmdsbuf, WIDTH);
queue_add_blocking_u32(&dvi0.q_tmds_valid, &tmdsbuf);
}
if (swap_wait) { // Swap buffers?
back_index = 1 - back_index; // Yes plz
buffer = buffer_save + ((WIDTH + 7) / 8) * HEIGHT * back_index;
swap_wait = 0;
}
}
}
bool DVIGFX1::begin(void) {
if ((getBuffer())) {
gfxptr = this;
mainloop = mainloop1;
PicoDVI::begin();
wait_begin = false; // Set core 1 in motion
return true;
}
return false;
}
void DVIGFX1::swap(bool copy_framebuffer) {
if (dbuf) {
// Request buffer swap at next frame end, wait for it to happen.
for (swap_wait = 1; swap_wait;)
;
if ((copy_framebuffer)) {
uint32_t bufsize = ((WIDTH + 7) / 8) * HEIGHT;
memcpy(buffer_save + bufsize * back_index,
buffer_save + bufsize * (1 - back_index), bufsize);
}
}
}
// TEXT MODE IS A WORK IN PROGRESS
#define FONT_CHAR_WIDTH 8 ///< Character block width, pixels
#define FONT_CHAR_HEIGHT 8 ///< Character block height, pixels
#define FONT_N_CHARS 256 ///< Number of symbols in font
#define FONT_FIRST_ASCII 0 ///< Full CP437 is there, start at 0
#include "font_8x8.h"
DVItext1::DVItext1(const DVIresolution r, const struct dvi_serialiser_cfg &c,
vreg_voltage v)
: PicoDVI(dvispec[r].timing, c, v),
GFXcanvas16(dvispec[r].width / 8, dvispec[r].height / 8) {
dvi_vertical_repeat = dvispec[r].v_rep;
dvi_monochrome_tmds = true;
}
DVItext1::~DVItext1(void) { gfxptr = NULL; }
// Character framebuffer is actually a small GFXcanvas16, so...
size_t DVItext1::write(uint8_t c) {
if (c == '\r') { // Carriage return
cursor_x = 0;
} else if ((c == '\n') || (cursor_x >= WIDTH)) { // Newline OR right edge
cursor_x = 0;
if (cursor_y >= (HEIGHT - 1)) { // Vert scroll?
memmove(getBuffer(), getBuffer() + WIDTH, WIDTH * (HEIGHT - 1) * 2);
drawFastHLine(0, HEIGHT - 1, WIDTH, ' '); // Clear bottom line
cursor_y = HEIGHT - 1;
} else {
cursor_y++;
}
}
if ((c != '\r') && (c != '\n')) {
drawPixel(cursor_x, cursor_y, c);
cursor_x++;
}
return 1;
}
// TO DO: alloc this dynamically as part of object (maybe part of canvas)
static uint8_t scanbuf[1280 / 8] __attribute__((aligned(4)));
#ifdef TERM_USE_INTERRUPT
void inline __not_in_flash_func(DVItext1::_prepare_scanline)(uint16_t y) {
uint16_t *row = getBuffer() + (y / FONT_CHAR_HEIGHT) * WIDTH;
uint32_t offset = (y & 7) * FONT_N_CHARS;
// Blit font into 1bpp scanline buffer, then encode scanbuf into tmdsbuf
for (uint16_t x = 0; x < WIDTH; x++) {
// Though this only handles 8-bit character output (e.g. ASCII), the
// character buffer uses 16-bit cells. The LOWER BYTE contains the 8-bit
// character value, while (for now) the UPPER BYTE is either 0 (display
// normally) or 255 (inverse). Eventually the upper byte might be
// switched to bitfields, e.g. bit 0 = inverse, bit 1 = blink, maybe an
// underscore cursor or something, etc. This is slightly wasteful, but
// greatly simplifies keeping character values and attributes always
// moving together (and the display buffer really isn't THAT big).
uint8_t mask = row[x] >> 8;
uint8_t c = (row[x] & 255) - FONT_FIRST_ASCII;
scanbuf[x] = font_8x8[offset + c] ^ mask;
}
uint32_t *tmdsbuf;
queue_remove_blocking_u32(&dvi0.q_tmds_free, &tmdsbuf);
tmds_encode_1bpp((const uint32_t *)scanbuf, tmdsbuf, WIDTH * 8);
queue_add_blocking_u32(&dvi0.q_tmds_valid, &tmdsbuf);
}
void __not_in_flash_func(text1_scanline_callback)(void) {
static uint y = 1;
((DVItext1 *)gfxptr)->_prepare_scanline(y);
y = (y + 1) % (((DVItext1 *)gfxptr)->height() * 8);
}
static void mainlooptext1(struct dvi_inst *inst) {
// Idle func, everything happens in interrupt
for (;;)
delay(1000);
}
#else
// Old way, without interrupt
// This is a little simpler and might stick with it
// since nothing important to do in idle func above.
static void mainlooptext1(struct dvi_inst *inst) {
((DVItext1 *)gfxptr)->_mainloop();
}
void __not_in_flash_func(DVItext1::_mainloop)(void) {
for (;;) {
for (uint16_t y = 0; y < HEIGHT; y++) {
uint16_t *row = getBuffer() + y * WIDTH;
for (uint8_t y1 = 0; y1 < 8; y1++) {
uint32_t offset = y1 * FONT_N_CHARS;
for (uint16_t x = 0; x < WIDTH; x++) {
// See notes above
uint8_t mask = row[x] >> 8;
uint8_t c = (row[x] & 255) - FONT_FIRST_ASCII;
scanbuf[x] = font_8x8[offset + c] ^ mask;
}
uint32_t *tmdsbuf;
queue_remove_blocking_u32(&dvi0.q_tmds_free, &tmdsbuf);
tmds_encode_1bpp((const uint32_t *)scanbuf, tmdsbuf, WIDTH * 8);
queue_add_blocking_u32(&dvi0.q_tmds_valid, &tmdsbuf);
}
}
}
}
#endif // end TERM_USE_INTERRUPT
bool DVItext1::begin(void) {
if ((getBuffer())) {
fillScreen(' ');
gfxptr = this;
#ifdef TERM_USE_INTERRUPT
dvi0.scanline_callback = text1_scanline_callback;
#endif
mainloop = mainlooptext1;
PicoDVI::begin();
// Must do this AFTER begin because tmdsbuf (accessed in func)
// doesn't exist yet until dvi_init (in begin) is called.
#ifdef TERM_USE_INTERRUPT
_prepare_scanline(0);
#endif
wait_begin = false; // Set core 1 in motion
return true;
}
return false;
}
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