mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-04 22:53:08 +02:00
ubb-vga: added driver based on the MMC controller (highly experimental)
- ubb-vga2.c: use the MMC controler to stream the pixel data - Makefile (all, clean): added ubb-vga2
This commit is contained in:
parent
a794c4b1b2
commit
a759723ed1
@ -5,7 +5,7 @@ CFLAGS=-Wall -g -O9 -march=mips32
|
||||
|
||||
.PHONY: all asm sch clean spotless
|
||||
|
||||
all: ubb-vga
|
||||
all: ubb-vga ubb-vga2
|
||||
|
||||
asm: ubb-vga.c
|
||||
$(CC) $(CFLAGS) -S $<
|
||||
@ -14,6 +14,6 @@ sch:
|
||||
eeschema `pwd`/ubb-vga.sch
|
||||
|
||||
clean:
|
||||
rm -f ubb-vga
|
||||
rm -f ubb-vga ubb-vga2
|
||||
|
||||
spotless: clean
|
||||
|
526
ubb-vga/ubb-vga2.c
Normal file
526
ubb-vga/ubb-vga2.c
Normal file
@ -0,0 +1,526 @@
|
||||
/*
|
||||
* ubb-vga.c - Output video on UBB with more or less VGA timing
|
||||
*
|
||||
* Written 2011 by Werner Almesberger
|
||||
* Copyright 2011 Werner Almesberger
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
/*
|
||||
* WARNING: this program does very nasty things to the Ben and it doesn't
|
||||
* like company. In particular, it resents:
|
||||
*
|
||||
* - the MMC driver - disable it with
|
||||
* echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind
|
||||
* - the AT86RF230/1 kernel driver - use a kernel that doesn't have it
|
||||
* - anything that accesses the screen - kill GUI, X server, etc.
|
||||
* - the screen blanker - either disable it or make sure the screen stays
|
||||
* dark, e.g., with
|
||||
* echo 1 >/sys/devices/platform/jz4740-fb/graphics/fb0/blank
|
||||
* - probably a fair number of other daemons and things as well - best to
|
||||
* kill them all.
|
||||
*/
|
||||
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/mman.h>
|
||||
|
||||
|
||||
static uint8_t thres = 63;
|
||||
int bad;
|
||||
|
||||
/* ----- I/O pin assignment ------------------------------------------------ */
|
||||
|
||||
|
||||
#define DAT0 (1 << 10)
|
||||
#define DAT1 (1 << 11)
|
||||
#define DAT2 (1 << 12)
|
||||
#define DAT3 (1 << 13)
|
||||
#define CMD (1 << 8)
|
||||
#define CLK (1 << 9)
|
||||
|
||||
#define R DAT3
|
||||
#define G DAT0
|
||||
#define B DAT1
|
||||
#define Y DAT2
|
||||
#define HSYNC CMD
|
||||
#define VSYNC CLK
|
||||
|
||||
|
||||
/* ----- Ben hardware ------------------------------------------------------ */
|
||||
|
||||
|
||||
#define TIMER 7
|
||||
|
||||
|
||||
#define PAGE_SIZE 4096
|
||||
#define SOC_BASE 0x10000000
|
||||
|
||||
|
||||
static volatile uint32_t *icmr, *icmsr, *icmcr;
|
||||
static uint32_t old_icmr;
|
||||
|
||||
static volatile uint32_t *clkgr, *msccdr;
|
||||
static uint32_t old_clkgr;
|
||||
|
||||
static volatile uint32_t *pddats, *pddatc;
|
||||
static volatile uint32_t *pddirs, *pddirc;
|
||||
static volatile uint32_t *pdfuns, *pdfunc;
|
||||
|
||||
static volatile uint32_t *tssr, *tscr;
|
||||
static volatile uint32_t *tesr, *tecr;
|
||||
static volatile uint32_t *tcsr, *tdfr, *tcnt;
|
||||
|
||||
static volatile uint32_t *msc_strpcl, *msc_stat, *msc_clkrt;
|
||||
static volatile uint32_t *msc_cmdat, *msc_resto, *msc_blklen, *msc_nob;
|
||||
static volatile uint32_t *msc_cmd, *msc_arg, *msc_txfifo;
|
||||
|
||||
|
||||
static void disable_interrupts(void)
|
||||
{
|
||||
/*
|
||||
* @@@ Race condition alert ! If we get interrupted/preempted between
|
||||
* reading ICMR and masking all interrupts, and the code that runs
|
||||
* between these two operations changes ICMR, then we may set an
|
||||
* incorrect mask when restoring interrupts, which may hang the system.
|
||||
*/
|
||||
|
||||
old_icmr = *icmr;
|
||||
*icmsr = 0xffffffff;
|
||||
}
|
||||
|
||||
|
||||
static void enable_interrupts(void)
|
||||
{
|
||||
*icmcr = ~old_icmr;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @@@ Disabling the LCD clock will hang operations that depend on the LCD
|
||||
* subsystem to advance. This includes the screen saver.
|
||||
*/
|
||||
|
||||
static void disable_lcd(void)
|
||||
{
|
||||
old_clkgr = *clkgr;
|
||||
*clkgr = old_clkgr | 1 << 10;
|
||||
}
|
||||
|
||||
|
||||
static void enable_lcd(void)
|
||||
{
|
||||
*clkgr = old_clkgr;
|
||||
}
|
||||
|
||||
|
||||
static void get_timer(void)
|
||||
{
|
||||
*tscr = 1 << TIMER; /* enable clock */
|
||||
*tcsr = 1; /* count at PCLK/1 */
|
||||
*tdfr = 0xffff; /* count to 0xffff */
|
||||
*tesr = 1 << TIMER;
|
||||
}
|
||||
|
||||
|
||||
static void release_timer(void)
|
||||
{
|
||||
*tecr = 1 << TIMER;
|
||||
*tssr = 1 << TIMER;
|
||||
}
|
||||
|
||||
|
||||
static void *map(off_t addr, size_t size)
|
||||
{
|
||||
int fd;
|
||||
void *mem;
|
||||
|
||||
fd = open("/dev/mem", O_RDWR | O_SYNC);
|
||||
if (fd < 0) {
|
||||
perror("/dev/mem");
|
||||
exit(1);
|
||||
}
|
||||
mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr);
|
||||
if (mem == MAP_FAILED) {
|
||||
perror("mmap");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
return mem;
|
||||
}
|
||||
|
||||
|
||||
static void ben_setup(void)
|
||||
{
|
||||
volatile void *base;
|
||||
|
||||
base = map(SOC_BASE, PAGE_SIZE*3*16);
|
||||
|
||||
clkgr = base+0x20;
|
||||
msccdr = base+0x68;
|
||||
|
||||
icmr = base+0x1004;
|
||||
icmsr = base+0x1008;
|
||||
icmcr = base+0x100c;
|
||||
|
||||
pddats = base+0x10314;
|
||||
pddatc = base+0x10318;
|
||||
pdfuns = base+0x10344;
|
||||
pdfunc = base+0x10348;
|
||||
pddirs = base+0x10364;
|
||||
pddirc = base+0x10368;
|
||||
|
||||
tssr = base+0x202c;
|
||||
tscr = base+0x203c;
|
||||
tesr = base+0x2014;
|
||||
tecr = base+0x2018;
|
||||
tcsr = base+0x204c+0x10*TIMER;
|
||||
tdfr = base+0x2040+0x10*TIMER;
|
||||
tcnt = base+0x2048+0x10*TIMER;
|
||||
|
||||
msc_strpcl = base+0x21000;
|
||||
msc_stat = base+0x21004;
|
||||
msc_clkrt = base+0x21008;
|
||||
msc_cmdat = base+0x2100c;
|
||||
msc_resto = base+0x21010;
|
||||
msc_blklen = base+0x21018;
|
||||
msc_nob = base+0x2101c;
|
||||
msc_cmd = base+0x2102c;
|
||||
msc_arg = base+0x21030;
|
||||
msc_txfifo = base+0x2103c;
|
||||
|
||||
/*
|
||||
* Ironically, switching the LCD clock on and off many times only
|
||||
* increases the risk of a hang. Therefore, we leave stop it during
|
||||
* all the measurements and only enable it again at the end.
|
||||
*/
|
||||
disable_lcd();
|
||||
get_timer();
|
||||
}
|
||||
|
||||
|
||||
static void cleanup(void)
|
||||
{
|
||||
release_timer();
|
||||
enable_lcd();
|
||||
}
|
||||
|
||||
|
||||
/* ----- Delay logic ------------------------------------------------------- */
|
||||
|
||||
|
||||
#define US(us) ((uint16_t) ((us)*112))
|
||||
|
||||
|
||||
static void until(uint16_t cycles)
|
||||
{
|
||||
while ((*tcnt & 0xffff) < cycles);
|
||||
}
|
||||
|
||||
|
||||
/* ----- Frame buffer output ----------------------------------------------- */
|
||||
|
||||
|
||||
static int line_words = 640/8;
|
||||
//static int line_cycles = US(36); /* nominally 31.77 us, but we're too slow */
|
||||
//static int line_cycles = US(32); /* nominally 31.77 us, but we're too slow */
|
||||
static int line_cycles = US(29.6); /* nominally 31.77 us, but we're too fast */
|
||||
/*
|
||||
* Note: 29.5 is already too short. Tricky timing.
|
||||
*/
|
||||
|
||||
void setup(void)
|
||||
{
|
||||
mlockall(MCL_CURRENT | MCL_FUTURE);
|
||||
ben_setup();
|
||||
|
||||
*pdfuns = R | G | B | Y;
|
||||
*pdfunc = VSYNC | HSYNC;
|
||||
*pddirs = VSYNC | HSYNC | R | G | B | Y;
|
||||
*pddats = VSYNC | HSYNC;
|
||||
*pddatc = R | G | B | Y;
|
||||
|
||||
// *msccdr = 20; /* set the MSC clock to 336 MHz / 21 = 16 MHz */
|
||||
*msccdr = 11; /* set the MSC clock to 336 MHz / 12 = 28 MHz */
|
||||
*clkgr &= ~(1 << 7); /* enable MSC clock */
|
||||
*msc_clkrt = 0; /* bus clock = MSC clock / 1 */
|
||||
}
|
||||
|
||||
|
||||
static void line(const uint32_t *line, volatile const uint32_t *prefetch)
|
||||
{
|
||||
const uint32_t *p = line;
|
||||
|
||||
/* Back porch */
|
||||
|
||||
*tcnt = 0;
|
||||
|
||||
*msc_strpcl = 1 << 3; /* reset the MSC */
|
||||
// while (*msc_stat & (1 << 15));
|
||||
|
||||
/* HSYNC */
|
||||
*msc_txfifo = *p++;
|
||||
// *msc_txfifo = *p++;
|
||||
|
||||
until(US(0.79));
|
||||
|
||||
*pddatc = HSYNC;
|
||||
*msc_strpcl = 2; /* start MMC clock output */
|
||||
|
||||
*msc_cmdat =
|
||||
(1 << 10) | /* 4 bit bus */
|
||||
(1 << 4) | /* write */
|
||||
(1 << 3) | /* with data transfer */
|
||||
1; /* R1 response */
|
||||
|
||||
*msc_strpcl = 4; /* START_OP */
|
||||
|
||||
#if 1
|
||||
// *msc_txfifo = *p++;
|
||||
#else
|
||||
for (p = line; p != line+1; p++)
|
||||
for (p = line; p != line+1; p++)
|
||||
*msc_txfifo = *p;//0xf0f0f0f0;//*p;
|
||||
#endif
|
||||
|
||||
until(US(0.79+3.77-0.2));
|
||||
/*
|
||||
* Without the -0.2, the XEN-1510 only detects the signal in only about
|
||||
* 20% of all cases.
|
||||
*/
|
||||
|
||||
/* Front porch */
|
||||
|
||||
*pdfuns = CMD;
|
||||
*pddats = HSYNC;
|
||||
*pdfunc = CMD;
|
||||
// *msc_txfifo = *p++;
|
||||
// for (; p != line+4; p++)
|
||||
// *msc_txfifo = *p;//0xf0f0f0f0;//*p;
|
||||
// until(US(0.79+3.77+1.79-0.1));
|
||||
|
||||
// while (p != line+32) { //line_words) {
|
||||
while (p != line+line_words) {
|
||||
uint8_t st;
|
||||
do {
|
||||
st = *msc_stat;
|
||||
if (st & 3) {
|
||||
// printf("st 0x%04x\n", st);
|
||||
bad++;
|
||||
goto fail;
|
||||
// return;
|
||||
}
|
||||
}
|
||||
while (st & (1 << 7));
|
||||
*msc_txfifo = *p;
|
||||
//*msc_txfifo = 0xf0f0f0f0;
|
||||
p++;
|
||||
}
|
||||
|
||||
fail:
|
||||
//(void) *(volatile uint32_t *) (line+line_words);
|
||||
(void) *prefetch;
|
||||
until(line_cycles);
|
||||
}
|
||||
|
||||
|
||||
static void hdelay(int cycles)
|
||||
{
|
||||
while (cycles--) {
|
||||
*tcnt = 0;
|
||||
*pddatc = HSYNC;
|
||||
until(US(3.77));
|
||||
*pddats = HSYNC;
|
||||
until(line_cycles);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void frame(const uint32_t *f)
|
||||
{
|
||||
const uint32_t *p;
|
||||
|
||||
/* VSYNC */
|
||||
*pddatc = VSYNC;
|
||||
hdelay(2);
|
||||
*pddats = VSYNC;
|
||||
|
||||
/* Front porch */
|
||||
|
||||
#if 0
|
||||
hdelay(32);
|
||||
#else
|
||||
hdelay(31);
|
||||
*tcnt = 0;
|
||||
*pddatc = HSYNC;
|
||||
until(US(3.77));
|
||||
*pddats = HSYNC;
|
||||
until(line_cycles-US(0.79));
|
||||
#endif
|
||||
|
||||
for (p = f; p != f+240*line_words; p += line_words) {
|
||||
line(p, p);
|
||||
line(p, p+line_words);
|
||||
}
|
||||
|
||||
/* Back porch */
|
||||
hdelay(14);
|
||||
}
|
||||
|
||||
|
||||
/* ----- Frame buffer image generation ------------------------------------- */
|
||||
|
||||
|
||||
#if 0
|
||||
static uint32_t pick(int set, int bit, uint32_t val)
|
||||
{
|
||||
return set == bit ? val >> 8 : 0;
|
||||
}
|
||||
|
||||
|
||||
static uint32_t pattern(int set, int r, int g, int b)
|
||||
{
|
||||
return pick(set, r, R) | pick(set, g, G) | pick(set, b, B);
|
||||
}
|
||||
|
||||
static void tricolor(uint32_t *f)
|
||||
{
|
||||
int pairs = 2*line_pairs*240;
|
||||
int i;
|
||||
|
||||
for (i = 0; i != pairs/3; i++) {
|
||||
f[i & ~1] = R;
|
||||
f[i | 1] = G | B;
|
||||
}
|
||||
for (; i != pairs*2/3; i++) {
|
||||
f[i & ~1] = G;
|
||||
f[i | 1] = R | B;
|
||||
}
|
||||
|
||||
for (; i != pairs; i++) {
|
||||
f[i & ~1] = B;
|
||||
f[i | 1] = R | G;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void grid(uint8_t *f)
|
||||
{
|
||||
static uint32_t col[8] = {
|
||||
R | G | B,
|
||||
R,
|
||||
R | G,
|
||||
G,
|
||||
G | B,
|
||||
B,
|
||||
R | B,
|
||||
R | G | B,
|
||||
};
|
||||
int i, x, y;
|
||||
|
||||
for (i = 0; i != 8; i++) {
|
||||
x = i*line_pairs/4+line_pairs/8;
|
||||
for (y = 0; y != 240; y++) {
|
||||
uint8_t *p = f+y*2*line_pairs+x;
|
||||
p[0] = p[1] = col[i] >> 8;
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
static uint8_t pattern(int r, int g, int b)
|
||||
{
|
||||
return (r ? 0x88 : 0) | (g ? 0x11 : 0) | (b ? 0x22 : 0);
|
||||
}
|
||||
|
||||
|
||||
static void grab(uint8_t *f)
|
||||
{
|
||||
uint32_t *fb = map(0x01d00000, 4*320*240);
|
||||
int x, y;
|
||||
uint32_t pix;
|
||||
uint8_t r, g, b;
|
||||
|
||||
for (y = 0; y != 240; y++)
|
||||
for (x = 0; x != 320; x++) {
|
||||
pix = *fb++;
|
||||
r = pix >> 16;
|
||||
g = pix >> 8;
|
||||
b = pix;
|
||||
*f++ = pattern(r >= thres, g >= thres, b >= thres);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* ----- Command-line parsing and main loop -------------------------------- */
|
||||
|
||||
|
||||
static void session(int frames, int single)
|
||||
{
|
||||
uint32_t f[2*240*line_words];
|
||||
int i;
|
||||
|
||||
memset(f, 0, sizeof(f));
|
||||
grab((uint8_t *) f);
|
||||
// grid(f);
|
||||
|
||||
disable_interrupts();
|
||||
|
||||
for (i = 0; i != frames; i++)
|
||||
frame(f);
|
||||
|
||||
enable_interrupts();
|
||||
}
|
||||
|
||||
|
||||
static void usage(const char *name)
|
||||
{
|
||||
fprintf(stderr,
|
||||
"usage: %s frames [threshold]\n\n"
|
||||
" frames number of frames to display\n"
|
||||
" threshold channel on/off threshold\n\n"
|
||||
, name);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char *const *argv)
|
||||
{
|
||||
int frames;
|
||||
int single = 1;
|
||||
int c;
|
||||
|
||||
while ((c = getopt(argc, argv, "")) != EOF)
|
||||
switch (c) {
|
||||
default:
|
||||
usage(*argv);
|
||||
}
|
||||
|
||||
switch (argc-optind) {
|
||||
case 2:
|
||||
thres = atoi(argv[optind+1]);
|
||||
/* fall through */
|
||||
case 1:
|
||||
frames = atoi(argv[optind]);
|
||||
break;
|
||||
default:
|
||||
usage(*argv);
|
||||
}
|
||||
|
||||
setup();
|
||||
session(frames, single);
|
||||
cleanup();
|
||||
|
||||
printf("%d\n", bad);
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user