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This commit is contained in:
Joppe Blondel
2026-04-01 17:39:05 +02:00
parent 8cce172c95
commit 435a96d203
6 changed files with 633 additions and 207 deletions
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3
CMakeLists.txt
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@@ -26,7 +26,7 @@ pico_generate_pio_header(${PROJECT_NAME}
${CMAKE_CURRENT_LIST_DIR}/video_dma.pio ${CMAKE_CURRENT_LIST_DIR}/video_dma.pio
) )
target_sources(picopal PRIVATE main.c) target_sources(picopal PRIVATE main.c cvideo.c)
pico_set_program_name(picopal "picopal") pico_set_program_name(picopal "picopal")
@@ -44,6 +44,7 @@ target_link_libraries(picopal
hardware_pio hardware_pio
hardware_timer hardware_timer
hardware_clocks hardware_clocks
pico_multicore
) )
pico_add_extra_outputs(picopal) pico_add_extra_outputs(picopal)

196
cvideo.c Normal file
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@@ -0,0 +1,196 @@
#include "cvideo.h"
#include <stdio.h>
#include <string.h>
#include "pico/stdlib.h"
#include "hardware/clocks.h"
#include "hardware/dma.h"
#include "hardware/irq.h"
#include "hardware/pio.h"
#include "video_dma.pio.h"
// ---------------------------
// User-adjustable pins
// ---------------------------
#define VIDEO_PIO pio0
#define DATA_SM 0
#define SYNC_SM 1
#define DATA_PIN 2 // pixel / luma bit pin
#define SYNC_PIN 3 // sync pin
#define SYNC_INTERVAL_S 0.000002f // 2 us per sync-SM instruction
#define ACTIVE_VIDEO_S 0.000052f // 52 us active video per line
// Match the .pio program's published constant.
// pioasm will emit CLOCKS_PER_BIT in the generated header.
#ifndef CLOCKS_PER_BIT
#define CLOCKS_PER_BIT 6
#endif
// Field/line tracking for line-based DMA.
// This is intentionally kept in software to match the sync SM's 288 active
// lines per field.
static volatile bool even_field = true;
static volatile uint line_in_field = 0;
// DMA channel that feeds the PIO TX FIFO
static int video_dma_chan;
static video_framebuffer_ptr_t framebuffer;
static volatile video_framebuffer_ptr_t pending_framebuffer;
static void (*framebuffer_switched_cb)() = NULL;
// ---------------------------
// PIO init helpers
// ---------------------------
static void init_cvdata_program(PIO pio, uint sm, uint offset, float clkdiv, uint data_pin) {
pio_sm_config c = cvdata_program_get_default_config(offset);
sm_config_set_set_pins(&c, data_pin, 1);
sm_config_set_out_pins(&c, data_pin, 1);
sm_config_set_clkdiv(&c, clkdiv);
// Shift left, autopull every 32 bits.
// If the image is mirrored, change this to shift-right and/or change bit packing.
sm_config_set_out_shift(&c, false, true, 32);
pio_gpio_init(pio, data_pin);
pio_sm_set_consecutive_pindirs(pio, sm, data_pin, 1, true);
pio_sm_init(pio, sm, offset, &c);
// Preload X = VIDEO_WIDTH - 1
pio_sm_put_blocking(pio, sm, VIDEO_WIDTH - 1);
pio_sm_exec(pio, sm, pio_encode_pull(false, false));
pio_sm_exec(pio, sm, pio_encode_mov(pio_x, pio_osr));
pio_sm_exec(pio, sm, pio_encode_out(pio_null, 32));
}
static void init_cvsync_program(PIO pio, uint sm, uint offset, float clkdiv, uint sync_pin) {
pio_sm_config c = cvsync_program_get_default_config(offset);
sm_config_set_sideset_pins(&c, sync_pin);
sm_config_set_clkdiv(&c, clkdiv);
pio_gpio_init(pio, sync_pin);
pio_sm_set_consecutive_pindirs(pio, sm, sync_pin, 1, true);
pio_sm_init(pio, sm, offset, &c);
// Preload OSR = lines_per_field - 1
pio_sm_put_blocking(pio, sm, LINES_PER_FIELD - 1);
pio_sm_exec(pio, sm, pio_encode_pull(false, false));
// Start with Y = 0, meaning "even field" in this program.
pio_sm_exec(pio, sm, pio_encode_set(pio_y, 0));
}
// ---------------------------
// DMA setup
// ---------------------------
static void init_video_dma(PIO pio, uint data_sm) {
video_dma_chan = dma_claim_unused_channel(true);
dma_channel_config cfg = dma_channel_get_default_config(video_dma_chan);
channel_config_set_transfer_data_size(&cfg, DMA_SIZE_32);
channel_config_set_read_increment(&cfg, true);
channel_config_set_write_increment(&cfg, false);
// Pace the DMA from the data SM TX FIFO DREQ
channel_config_set_dreq(&cfg, pio_get_dreq(pio, data_sm, true));
dma_channel_configure(
video_dma_chan,
&cfg,
&pio->txf[data_sm], // write address
NULL, // read address set per line
0, // transfer count set per line
false // don't start yet
);
}
// ---------------------------
// Start DMA for one scanline
// ---------------------------
static inline void start_dma_for_current_line(void) {
if (line_in_field == 0 && even_field && pending_framebuffer) {
framebuffer = (video_framebuffer_ptr_t)pending_framebuffer;
pending_framebuffer = NULL;
if(framebuffer_switched_cb)
framebuffer_switched_cb();
}
uint src_line = even_field ? (line_in_field * 2u) : (line_in_field * 2u + 1u);
dma_channel_set_read_addr(video_dma_chan, framebuffer[src_line], false);
dma_channel_set_trans_count(video_dma_chan, WORDS_PER_LINE, true);
line_in_field++;
if (line_in_field >= LINES_PER_FIELD) {
line_in_field = 0;
even_field = !even_field;
}
}
// ---------------------------
// PIO IRQ handler:
// The sync SM pushes one token into its RX FIFO during each line's back porch.
// As soon as the previous line DMA has finished, consume one token and arm the
// next scanline so the data FIFO is primed before visible pixels start.
// ---------------------------
static void pio0_irq0_handler(void) {
if (!pio_sm_is_rx_fifo_empty(VIDEO_PIO, SYNC_SM) && !dma_channel_is_busy(video_dma_chan)) {
(void)pio_sm_get(VIDEO_PIO, SYNC_SM);
start_dma_for_current_line();
}
}
void video_init(video_framebuffer_t fb) {
if ((VIDEO_WIDTH % 32) != 0) {
panic("VIDEO_WIDTH must be a multiple of 32");
}
framebuffer = fb;
pending_framebuffer = NULL;
uint sync_offset = pio_add_program(VIDEO_PIO, &cvsync_program);
uint data_offset = pio_add_program(VIDEO_PIO, &cvdata_program);
// Same timing idea as the original repo:
// sync SM: 1 instruction every 2 us
// data SM: enough PIO cycles to emit VIDEO_WIDTH bits in 52 us
float sys_hz = (float)clock_get_hz(clk_sys);
float data_clkdiv = (sys_hz / ((float)VIDEO_WIDTH / ACTIVE_VIDEO_S)) / (float)CLOCKS_PER_BIT;
float sync_clkdiv = sys_hz * SYNC_INTERVAL_S;
init_cvdata_program(VIDEO_PIO, DATA_SM, data_offset, data_clkdiv, DATA_PIN);
init_cvsync_program(VIDEO_PIO, SYNC_SM, sync_offset, sync_clkdiv, SYNC_PIN);
init_video_dma(VIDEO_PIO, DATA_SM);
// Route sync-SM RX FIFO notifications to CPU IRQ 0.
pio_set_irq0_source_enabled(VIDEO_PIO, pis_sm1_rx_fifo_not_empty, true);
irq_set_exclusive_handler(PIO0_IRQ_0, pio0_irq0_handler);
irq_set_enabled(PIO0_IRQ_0, true);
// Start with the first line of the even field
even_field = true;
line_in_field = 0;
// Prime the FIFO so the very first active line does not depend on IRQ latency.
start_dma_for_current_line();
pio_sm_set_enabled(VIDEO_PIO, DATA_SM, true);
pio_sm_set_enabled(VIDEO_PIO, SYNC_SM, true);
}
void video_set_framebuffer(video_framebuffer_t fb) {
pending_framebuffer = fb;
}
void video_set_framebuffer_switched_cb(void (*cb)()){
framebuffer_switched_cb = cb;
}

18
cvideo.h Normal file
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@@ -0,0 +1,18 @@
#pragma once
#include <stdint.h>
// ---------------------------
// Video format
// ---------------------------
#define VIDEO_WIDTH 768
#define VIDEO_HEIGHT 576
#define WORDS_PER_LINE (VIDEO_WIDTH / 32)
#define LINES_PER_FIELD (VIDEO_HEIGHT / 2)
typedef uint32_t video_framebuffer_t[VIDEO_HEIGHT][WORDS_PER_LINE];
typedef uint32_t (*video_framebuffer_ptr_t)[WORDS_PER_LINE];
void video_init(video_framebuffer_t fb);
void video_set_framebuffer(video_framebuffer_t fb);
void video_set_framebuffer_switched_cb(void (*cb)());

324
font.xbm Normal file
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@@ -0,0 +1,324 @@
#define font_width 160
#define font_height 192
static char font_bits[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
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0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xCD, 0xCE, 0x3C, 0x73, 0xCE, 0x33, 0xCF, 0x3F, 0xFF, 0xCC, 0x33, 0x3F,
0xFF, 0xF3, 0xE4, 0xF3, 0x07, 0x38, 0xF2, 0xCC, 0xB5, 0xCE, 0x3C, 0x78,
0xFE, 0x33, 0x0F, 0x3E, 0xF8, 0xFC, 0x03, 0x3F, 0xFF, 0xF3, 0xF0, 0xF3,
0x27, 0x39, 0xF0, 0xCC, 0xB5, 0x0E, 0x3C, 0x73, 0xFE, 0x33, 0xCF, 0x3F,
0xFF, 0xC4, 0x33, 0x3F, 0xFF, 0xF3, 0xE4, 0xF3, 0xE7, 0x39, 0xF1, 0xCC,
0x4D, 0xCF, 0x3C, 0x73, 0xCE, 0x33, 0xCF, 0x3F, 0xFF, 0xCC, 0x33, 0x3F,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x83, 0x1F, 0x3E, 0xF8,
0xE1, 0x03, 0xCF, 0x3C, 0x73, 0x9E, 0x39, 0xCF, 0x3C, 0xF0, 0xF1, 0xF3,
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0x73, 0x9E, 0x93, 0xCF, 0xFC, 0xF3, 0xF9, 0xF3, 0x3F, 0x7F, 0xF8, 0xFF,
0x33, 0xCF, 0x3C, 0xF3, 0xFC, 0xCF, 0xCF, 0x3C, 0x73, 0x9E, 0x93, 0x1F,
0xFE, 0xF9, 0xF9, 0xE7, 0x3F, 0x3F, 0xF3, 0xFF, 0x33, 0xCF, 0x3C, 0xF3,
0xE1, 0xCF, 0xCF, 0x3C, 0x73, 0x92, 0xC7, 0x1F, 0xFE, 0xFC, 0xF9, 0xE7,
0x3F, 0xFF, 0xFF, 0xFF, 0x83, 0xCF, 0x3C, 0xF8, 0xCF, 0xCF, 0xCF, 0x3C,
0x73, 0x92, 0xC7, 0x3F, 0x7F, 0xFE, 0xF9, 0xCF, 0x3F, 0xFF, 0xFF, 0xFF,
0xF3, 0xCF, 0x3C, 0xF9, 0xCF, 0xCF, 0xCF, 0x3C, 0x73, 0x80, 0x93, 0x3F,
0x3F, 0xFF, 0xF9, 0xCF, 0x3F, 0xFF, 0xFF, 0xFF, 0xF3, 0xCF, 0x3C, 0xF3,
0xCC, 0xCF, 0xCF, 0x7C, 0x78, 0x80, 0x93, 0x3F, 0x3F, 0xF0, 0xF9, 0x9F,
0x3F, 0xFF, 0xFF, 0xFF, 0xF3, 0x1F, 0x3E, 0xF3, 0xE1, 0xCF, 0x1F, 0xFE,
0xFC, 0xCC, 0x39, 0x3F, 0x3F, 0xF0, 0xF9, 0x9F, 0x3F, 0xFF, 0xFF, 0xFF,
0xFF, 0x7F, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xF9, 0x3F, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF1, 0x3F,
0x1F, 0xFF, 0xFF, 0xC0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC0,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F,
0xFF, 0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xFF, 0x3F, 0xFF,
0xFF, 0x3F, 0xFF, 0xFF, 0xF8, 0xFF, 0xF3, 0x3F, 0xFF, 0xF9, 0xFC, 0xC7,
0xFF, 0xFF, 0xFF, 0xFF, 0xCF, 0xFF, 0x3F, 0xFF, 0xFF, 0x3F, 0xFF, 0x7F,
0xF8, 0xFF, 0xF3, 0xFF, 0xFF, 0xFF, 0xFC, 0xCF, 0xFF, 0xFF, 0xFF, 0xFF,
0x9F, 0x0F, 0x3F, 0xFF, 0xE1, 0x3F, 0x1F, 0x7E, 0xFE, 0xC0, 0x83, 0x1F,
0x7F, 0xF8, 0xCC, 0xCF, 0x07, 0x3C, 0xF8, 0xE1, 0xFF, 0x7F, 0x3E, 0xF8,
0xCC, 0x07, 0xCF, 0x7C, 0x7E, 0xE6, 0x33, 0x3F, 0xFF, 0xF9, 0xE4, 0xCF,
0x27, 0x39, 0xF3, 0xCC, 0xFF, 0x0F, 0x3E, 0xF3, 0xFC, 0x33, 0xCF, 0x3C,
0x7C, 0xE6, 0x33, 0x3F, 0xFF, 0xF9, 0xF0, 0xCF, 0x27, 0x39, 0xF3, 0xCC,
0xFF, 0x67, 0x3E, 0xF3, 0xFC, 0x33, 0x0F, 0x7C, 0xFE, 0xF0, 0x33, 0x3F,
0xFF, 0xF9, 0xF0, 0xCF, 0x27, 0x39, 0xF3, 0xCC, 0xFF, 0x67, 0x3E, 0xF3,
0xCC, 0x33, 0xCF, 0x7F, 0x7E, 0xFC, 0x33, 0x3F, 0xFF, 0xF9, 0xE4, 0xCF,
0x27, 0x39, 0xF3, 0xCC, 0xFF, 0x8F, 0x3C, 0xF8, 0xE1, 0x07, 0x1F, 0x7E,
0x7E, 0xF0, 0x33, 0x1F, 0xFE, 0xF9, 0xCC, 0x87, 0x27, 0x39, 0xF3, 0xE1,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0xE6, 0xFF, 0xFF,
0x7F, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0xFF, 0xFF, 0x7F, 0xFC, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xE7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xCF,
0x9F, 0xFF, 0x7F, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF3, 0xCF, 0x3F, 0xFF, 0x7F, 0x9E,
0x83, 0x1F, 0x7C, 0xF8, 0xC1, 0xE7, 0xCF, 0x3C, 0x73, 0x9E, 0x39, 0xCF,
0x3C, 0xF8, 0xF3, 0xCF, 0x3F, 0xFF, 0x7F, 0x9E, 0x33, 0xCF, 0x3C, 0xF6,
0xFC, 0x87, 0xCF, 0x3C, 0x73, 0x9E, 0x93, 0xCF, 0xFC, 0xF9, 0xF3, 0xCF,
0x3F, 0x3F, 0x66, 0x9E, 0x33, 0xCF, 0x3C, 0xFF, 0xE0, 0xE7, 0xCF, 0x3C,
0x73, 0x92, 0xC7, 0xCF, 0xFC, 0xFC, 0xF9, 0xCF, 0x7F, 0x9E, 0x64, 0x9E,
0x33, 0xCF, 0x3C, 0xFF, 0xC7, 0xE7, 0xCF, 0x3C, 0x73, 0x92, 0xC7, 0xCF,
0x7C, 0xFE, 0xF9, 0xCF, 0x7F, 0x9E, 0x71, 0x9E, 0x33, 0xCF, 0x3C, 0xFF,
0xC7, 0x87, 0xCF, 0x7C, 0x78, 0x80, 0x93, 0xCF, 0x3C, 0xFF, 0xF3, 0xCF,
0x3F, 0xFF, 0x7F, 0x9E, 0x83, 0x1F, 0x3C, 0xFF, 0xE0, 0x8F, 0x1F, 0xFC,
0xFC, 0xCC, 0x39, 0x1F, 0x3C, 0xF8, 0xF3, 0xCF, 0x3F, 0xFF, 0x7F, 0x9E,
0xF3, 0xFF, 0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFC, 0xFF, 0xF3, 0xCF, 0x3F, 0xFF, 0x7F, 0x9E, 0xF3, 0xFF, 0xFC, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x1F, 0xFE, 0xFF, 0xE7, 0xCF,
0x9F, 0xFF, 0x7F, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x3E, 0xFF, 0xFB,
0xE3, 0xFF, 0xCF, 0xFC, 0xFC, 0xF3, 0x01, 0xFE, 0x1F, 0xE0, 0xFF, 0xFF,
0x07, 0xF8, 0x7F, 0x80, 0x79, 0x3E, 0x7F, 0xF0, 0xC9, 0xFD, 0xCE, 0xFC,
0xFC, 0xED, 0x79, 0x1E, 0x9E, 0xE7, 0xFF, 0xFF, 0xE7, 0x79, 0x78, 0x9E,
0x79, 0xFE, 0x3F, 0xE0, 0xF9, 0x4B, 0x1F, 0xFE, 0xFC, 0xFD, 0x79, 0xEE,
0x9D, 0xE7, 0x99, 0xFF, 0xE7, 0xB9, 0x77, 0x9E, 0x79, 0x3E, 0x9F, 0xE5,
0xFB, 0xB7, 0x1F, 0xFE, 0xFC, 0xFB, 0x79, 0x36, 0x9B, 0xE7, 0xCC, 0xFF,
0xE7, 0x59, 0x6C, 0x9E, 0x79, 0x3E, 0x9F, 0xFD, 0xE0, 0x7B, 0x3F, 0xFF,
0xFF, 0xF5, 0x79, 0xD6, 0x9B, 0x67, 0xE6, 0x01, 0xE6, 0x59, 0x6B, 0x9E,
0x79, 0x3E, 0x9F, 0xFE, 0xFB, 0x7B, 0x0F, 0xFC, 0xFF, 0xEB, 0x79, 0xD6,
0x9B, 0x67, 0xE6, 0x7F, 0xE6, 0x59, 0x6C, 0x9E, 0x79, 0x3E, 0x9F, 0xE6,
0xF8, 0xB7, 0x3F, 0xFF, 0xFC, 0xF7, 0x79, 0x36, 0x9B, 0xE7, 0xCC, 0x7F,
0xE6, 0x59, 0x6B, 0x9E, 0x79, 0x3E, 0x3F, 0x60, 0xB9, 0x4B, 0x0F, 0xFC,
0xFC, 0xEF, 0x79, 0xEE, 0x9D, 0xE7, 0x99, 0x7F, 0xE6, 0xB9, 0x77, 0x9E,
0x79, 0x3E, 0x7F, 0xF0, 0xC4, 0xFD, 0x3E, 0xFF, 0xFC, 0xED, 0x79, 0x1E,
0x9E, 0xE7, 0xFF, 0xFF, 0xE7, 0x79, 0x78, 0x9E, 0x01, 0xFE, 0x7F, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xF3, 0x01, 0xFE, 0x1F, 0xE0, 0xFF, 0xFF,
0x07, 0xF8, 0x7F, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xCF, 0xFF, 0xFF, 0xFC,
0xE3, 0x01, 0xFE, 0x7F, 0xE0, 0xFF, 0x01, 0x7E, 0x1F, 0xE0, 0xFF, 0xFB,
0xEF, 0x1F, 0xFF, 0xF3, 0xB7, 0xFF, 0xFF, 0xFB, 0xEF, 0x79, 0xFE, 0x3F,
0xF4, 0xFF, 0x79, 0x3E, 0x9F, 0xE7, 0xFF, 0xF9, 0xE6, 0x7B, 0xEF, 0xF3,
0xB7, 0x3F, 0xFF, 0xFD, 0xF7, 0x79, 0xCE, 0x3C, 0xF4, 0xFF, 0x79, 0x7E,
0x9F, 0x67, 0xE6, 0x7B, 0xEF, 0xBD, 0xF7, 0xFF, 0xCF, 0x3F, 0xFF, 0xFE,
0xEF, 0x79, 0xCE, 0x7C, 0xF4, 0xFF, 0x79, 0x7E, 0x9F, 0xE7, 0xCC, 0xBB,
0xEF, 0x7E, 0xFB, 0xF3, 0xFF, 0x0F, 0xFC, 0xF8, 0xF3, 0x79, 0xCE, 0xFC,
0xF4, 0xF3, 0x79, 0x3E, 0x9E, 0xE7, 0x99, 0xD1, 0x47, 0x9F, 0xFD, 0xF1,
0xFF, 0x0F, 0xFC, 0xFF, 0xFF, 0x79, 0xCE, 0xFC, 0xF4, 0xF3, 0x79, 0xFE,
0x9F, 0xE7, 0x99, 0xAF, 0xBE, 0xFC, 0xEA, 0xF8, 0xFF, 0x3F, 0xFF, 0xFF,
0xFF, 0x79, 0xCE, 0xFC, 0xF4, 0xFF, 0x79, 0xFE, 0x9F, 0xE7, 0xCC, 0xB7,
0xDE, 0x7B, 0xEB, 0xDC, 0xFF, 0x3F, 0xFF, 0xFF, 0xFF, 0x79, 0x2E, 0xFA,
0xF4, 0xFF, 0x79, 0xFE, 0x9F, 0x67, 0xE6, 0x3B, 0xEE, 0xBD, 0xE3, 0xCC,
0xFF, 0x0F, 0xFC, 0xFF, 0xFF, 0x79, 0xEE, 0xFF, 0xFF, 0xFF, 0x79, 0xFE,
0x9F, 0xE7, 0xFF, 0xFD, 0xF6, 0xDE, 0xEF, 0xE1, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x01, 0xEE, 0xFF, 0xFF, 0xFF, 0x01, 0xFE, 0x1F, 0xE0, 0xFF, 0xFF,
0xFE, 0xF8, 0xEF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0xE0, 0xFF, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xFF, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xDE, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xED, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xF3, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xF3, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xED, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xDE, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xFF, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0xE0, 0xFF, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0xE0, 0xFF, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xF3, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xF3, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xFF, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xC0, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xFF, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xF3, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0xE7, 0xF3, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0xE7, 0xFF, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0xE0, 0xFF, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67,
0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79,
0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99,
0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E,
0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x79, 0xE6,
0x99, 0x67, 0x9E, 0x79, 0xE6, 0x99, 0x67, 0x9E, 0x01, 0x06, 0x18, 0x60,
0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01, 0x06, 0x18, 0x60, 0x80, 0x01,
0x06, 0x18, 0x60, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
};

293
main.c
View File

@@ -1,231 +1,116 @@
// main.c
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include "pico/stdlib.h" #include "pico/stdlib.h"
#include "hardware/clocks.h" #include "pico/multicore.h"
#include "hardware/dma.h"
#include "hardware/irq.h"
#include "hardware/pio.h"
#include "video_dma.pio.h" #include "cvideo.h"
// --------------------------- #include "font.xbm"
// User-adjustable pins
// ---------------------------
#define VIDEO_PIO pio0
#define DATA_SM 0
#define SYNC_SM 1
#define DATA_PIN 2 // pixel / luma bit pin static video_framebuffer_t fb0, fb1;
#define SYNC_PIN 3 // sync pin
// --------------------------- #define START_X 35
// Video format #define END_X (VIDEO_WIDTH-40)
// --------------------------- #define START_Y 20
#define VIDEO_WIDTH 768 #define END_Y (VIDEO_HEIGHT-40)
#define VIDEO_HEIGHT 576
#define WORDS_PER_LINE (VIDEO_WIDTH / 32)
#define LINES_PER_FIELD (VIDEO_HEIGHT / 2)
#define SYNC_INTERVAL_S 0.000002f // 2 us per sync-SM instruction #define CHARS_PER_LINE 32
#define ACTIVE_VIDEO_S 0.000052f // 52 us active video per line #define CHAR_LINES 20
// Match the .pio program's published constant. static char text_mode_buffer[20][32];
// pioasm will emit CLOCKS_PER_BIT in the generated header.
#ifndef CLOCKS_PER_BIT
#define CLOCKS_PER_BIT 6
#endif
// --------------------------- static void clear(video_framebuffer_t fb){
// Framebuffer memset(fb, 0, sizeof(video_framebuffer_t));
// One bit per pixel, 32 pixels per word }
// ---------------------------
static uint32_t framebuffer[VIDEO_HEIGHT][WORDS_PER_LINE];
// Field/line tracking for line-based DMA. static void set_bit(video_framebuffer_t fb, uint x, uint y, bool value) {
// This is intentionally kept in software to match the sync SM's 288 active if(x>=VIDEO_WIDTH || y>=VIDEO_HEIGHT)
// lines per field. return;
static volatile bool even_field = true; uint index_x = x / 32;
static volatile uint line_in_field = 0; uint pos_x = x % 32;
// DMA channel that feeds the PIO TX FIFO uint flag = value << (31-pos_x);
static int video_dma_chan; if(value)
fb[y][index_x] |= flag;
else
fb[y][index_x] &= ~flag;
}
// --------------------------- #define CHAR_WIDTH font_width / 16
// Optional test pattern #define CHAR_HEIGHT font_height / 16
// Replace this with your own drawing code.
// ---------------------------
#define BORDER 40
static void fill_test_pattern(void) {
memset(framebuffer, 0x00, sizeof(framebuffer));
for (uint y = 0; y < VIDEO_HEIGHT; ++y) { void draw_character(video_framebuffer_t fb, unsigned int x, unsigned int y, unsigned int scale, char character) {
for (uint x = 0; x < VIDEO_WIDTH; ++x) { uint8_t row = character / 16;
bool on = false; uint8_t column = character % 16;
uint32_t font_x = column * 10;
uint32_t font_y = row * 12;
// Simple visible pattern: for (int j = font_y; j < font_y + CHAR_HEIGHT; j++) {
// border + checker for (int i = font_x; i < font_x + CHAR_WIDTH; i++) {
if (x < BORDER || x >= VIDEO_WIDTH - BORDER || y < BORDER || y >= VIDEO_HEIGHT - BORDER) { // XBM images pad rows with zeros
on = true; uint32_t array_position;
} else if (((x >> 4) ^ (y >> 4)) & 1) { if (font_width %8 != 0) {
on = true; array_position = (j * (font_width + (8 - font_width % 8))) + i;
} }
else {
array_position = (j * font_width) + i;
}
uint32_t array_index = array_position / 8;
// XBM image, low bits are first
uint32_t byte_position = array_position % 8;
if (on) { uint8_t value = font_bits[array_index] >> byte_position & 1 ;
uint word = x >> 5;
uint bit = 31 - (x & 31); // MSB-first for (int sx = 0; sx < scale; sx++) {
framebuffer[y][word] |= (1u << bit); for (int sy = 0; sy < scale; sy++) {
set_bit(fb, x + ((i - font_x) * scale) + sx, y + ((j- font_y) * scale) + sy, !value);
}
} }
} }
} }
} }
// --------------------------- void core1_entry() {
// PIO init helpers gpio_init(25);
// --------------------------- gpio_set_dir(25, GPIO_OUT);
static void init_cvdata_program(PIO pio, uint sm, uint offset, float clkdiv, uint data_pin) {
pio_sm_config c = cvdata_program_get_default_config(offset);
sm_config_set_set_pins(&c, data_pin, 1);
sm_config_set_out_pins(&c, data_pin, 1);
sm_config_set_clkdiv(&c, clkdiv);
// Shift left, autopull every 32 bits.
// If the image is mirrored, change this to shift-right and/or change bit packing.
sm_config_set_out_shift(&c, false, true, 32);
pio_gpio_init(pio, data_pin);
pio_sm_set_consecutive_pindirs(pio, sm, data_pin, 1, true);
pio_sm_init(pio, sm, offset, &c);
// Preload X = VIDEO_WIDTH - 1
pio_sm_put_blocking(pio, sm, VIDEO_WIDTH - 1);
pio_sm_exec(pio, sm, pio_encode_pull(false, false));
pio_sm_exec(pio, sm, pio_encode_mov(pio_x, pio_osr));
pio_sm_exec(pio, sm, pio_encode_out(pio_null, 32));
}
static void init_cvsync_program(PIO pio, uint sm, uint offset, float clkdiv, uint sync_pin) {
pio_sm_config c = cvsync_program_get_default_config(offset);
sm_config_set_sideset_pins(&c, sync_pin);
sm_config_set_clkdiv(&c, clkdiv);
pio_gpio_init(pio, sync_pin);
pio_sm_set_consecutive_pindirs(pio, sm, sync_pin, 1, true);
pio_sm_init(pio, sm, offset, &c);
// Preload OSR = lines_per_field - 1
pio_sm_put_blocking(pio, sm, LINES_PER_FIELD - 1);
pio_sm_exec(pio, sm, pio_encode_pull(false, false));
// Start with Y = 0, meaning "even field" in this program.
pio_sm_exec(pio, sm, pio_encode_set(pio_y, 0));
}
// ---------------------------
// DMA setup
// ---------------------------
static void init_video_dma(PIO pio, uint data_sm) {
video_dma_chan = dma_claim_unused_channel(true);
dma_channel_config cfg = dma_channel_get_default_config(video_dma_chan);
channel_config_set_transfer_data_size(&cfg, DMA_SIZE_32);
channel_config_set_read_increment(&cfg, true);
channel_config_set_write_increment(&cfg, false);
// Pace the DMA from the data SM TX FIFO DREQ
channel_config_set_dreq(&cfg, pio_get_dreq(pio, data_sm, true));
dma_channel_configure(
video_dma_chan,
&cfg,
&pio->txf[data_sm], // write address
NULL, // read address set per line
0, // transfer count set per line
false // don't start yet
);
}
// ---------------------------
// Start DMA for one scanline
// ---------------------------
static inline void start_dma_for_current_line(void) {
uint src_line = even_field ? (line_in_field * 2u) : (line_in_field * 2u + 1u);
dma_channel_set_read_addr(video_dma_chan, framebuffer[src_line], false);
dma_channel_set_trans_count(video_dma_chan, WORDS_PER_LINE, true);
line_in_field++;
if (line_in_field >= LINES_PER_FIELD) {
line_in_field = 0;
even_field = !even_field;
}
}
// ---------------------------
// PIO IRQ handler:
// The sync SM pushes one token into its RX FIFO during each line's back porch.
// As soon as the previous line DMA has finished, consume one token and arm the
// next scanline so the data FIFO is primed before visible pixels start.
// ---------------------------
static void pio0_irq0_handler(void) {
if (!pio_sm_is_rx_fifo_empty(VIDEO_PIO, SYNC_SM) && !dma_channel_is_busy(video_dma_chan)) {
(void)pio_sm_get(VIDEO_PIO, SYNC_SM);
start_dma_for_current_line();
}
}
// ---------------------------
// Video start
// ---------------------------
static void video_init(void) {
if ((VIDEO_WIDTH % 32) != 0) {
panic("VIDEO_WIDTH must be a multiple of 32");
}
uint sync_offset = pio_add_program(VIDEO_PIO, &cvsync_program);
uint data_offset = pio_add_program(VIDEO_PIO, &cvdata_program);
// Same timing idea as the original repo:
// sync SM: 1 instruction every 2 us
// data SM: enough PIO cycles to emit VIDEO_WIDTH bits in 52 us
float sys_hz = (float)clock_get_hz(clk_sys);
float data_clkdiv = (sys_hz / ((float)VIDEO_WIDTH / ACTIVE_VIDEO_S)) / (float)CLOCKS_PER_BIT;
float sync_clkdiv = sys_hz * SYNC_INTERVAL_S;
init_cvdata_program(VIDEO_PIO, DATA_SM, data_offset, data_clkdiv, DATA_PIN);
init_cvsync_program(VIDEO_PIO, SYNC_SM, sync_offset, sync_clkdiv, SYNC_PIN);
init_video_dma(VIDEO_PIO, DATA_SM);
// Route sync-SM RX FIFO notifications to CPU IRQ 0.
pio_set_irq0_source_enabled(VIDEO_PIO, pis_sm1_rx_fifo_not_empty, true);
irq_set_exclusive_handler(PIO0_IRQ_0, pio0_irq0_handler);
irq_set_enabled(PIO0_IRQ_0, true);
// Start with the first line of the even field
even_field = true;
line_in_field = 0;
// Prime the FIFO so the very first active line does not depend on IRQ latency.
start_dma_for_current_line();
pio_sm_set_enabled(VIDEO_PIO, DATA_SM, true);
pio_sm_set_enabled(VIDEO_PIO, SYNC_SM, true);
}
int main(void) {
stdio_init_all();
fill_test_pattern(); // Replace with your own framebuffer writer
video_init();
while (true) { while (true) {
// Your application code goes here. gpio_put(25, 1);
// Some other code can freely draw into framebuffer[]. sleep_ms(500);
gpio_put(25, 0);
sleep_ms(500);
}
}
void framebuffer_switched_cb(){
}
void main() {
stdio_init_all();
multicore_launch_core1(core1_entry);
clear(fb0);
clear(fb1);
video_init(fb0);
video_set_framebuffer_switched_cb(framebuffer_switched_cb);
int fbnum = 1;
video_framebuffer_ptr_t fbs[] = {fb0, fb1};
int i = 0;
while (true) {
clear(fbs[fbnum]);
for(int y=0; y<20; y++){
for(int x=0; x<32; x++){
draw_character(fbs[fbnum], START_X+x*(CHAR_WIDTH+1)*2, START_Y+y*(CHAR_HEIGHT+1)*2, 2, '0'+(i+x+y)%10);
}
}
video_set_framebuffer(fbs[fbnum]);
fbnum = (fbnum+1)%2;
i = (i+1)%10;
sleep_ms(500);
tight_loop_contents(); tight_loop_contents();
} }
} }

6
video_dma.pio
View File

@@ -10,6 +10,7 @@
.define DATA_DELAY 4 .define DATA_DELAY 4
.define LINE_IRQ 0 .define LINE_IRQ 0
.define HSHIFT_DELAY 0
.define PUBLIC CLOCKS_PER_BIT DATA_DELAY + 2 .define PUBLIC CLOCKS_PER_BIT DATA_DELAY + 2
.program cvsync .program cvsync
@@ -85,15 +86,16 @@ hsync_video:
; X = pixels_per_line - 1, preloaded once from C ; X = pixels_per_line - 1, preloaded once from C
; Each line: ; Each line:
; clear output ; clear output
; reload Y from X
; wait for sync SM to raise LINE_IRQ ; wait for sync SM to raise LINE_IRQ
; apply a small extra delay for horizontal positioning
; reload Y from X
; shift out one bit per loop ; shift out one bit per loop
.wrap_target .wrap_target
set pins, 0 set pins, 0
mov y, x
wait 1 irq LINE_IRQ wait 1 irq LINE_IRQ
irq clear LINE_IRQ irq clear LINE_IRQ
mov y, x
data_out: data_out:
out pins, 1 [DATA_DELAY] out pins, 1 [DATA_DELAY]