mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-23 22:11:53 +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:
Werner Almesberger
parent
a794c4b1b2
commit
a759723ed1
@ -5,7 +5,7 @@ CFLAGS=-Wall -g -O9 -march=mips32
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.PHONY: all asm sch clean spotless
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all: ubb-vga
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all: ubb-vga ubb-vga2
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asm: ubb-vga.c
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$(CC) $(CFLAGS) -S $<
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@ -14,6 +14,6 @@ sch:
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eeschema `pwd`/ubb-vga.sch
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clean:
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rm -f ubb-vga
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rm -f ubb-vga ubb-vga2
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spotless: clean
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526
ubb-vga/ubb-vga2.c
Normal file
526
ubb-vga/ubb-vga2.c
Normal file
@ -0,0 +1,526 @@
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/*
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* ubb-vga.c - Output video on UBB with more or less VGA timing
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* WARNING: this program does very nasty things to the Ben and it doesn't
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* like company. In particular, it resents:
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*
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* - the MMC driver - disable it with
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* echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind
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* - the AT86RF230/1 kernel driver - use a kernel that doesn't have it
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* - anything that accesses the screen - kill GUI, X server, etc.
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* - the screen blanker - either disable it or make sure the screen stays
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* dark, e.g., with
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* echo 1 >/sys/devices/platform/jz4740-fb/graphics/fb0/blank
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* - probably a fair number of other daemons and things as well - best to
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* kill them all.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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static uint8_t thres = 63;
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int bad;
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/* ----- I/O pin assignment ------------------------------------------------ */
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#define DAT0 (1 << 10)
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#define DAT1 (1 << 11)
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#define DAT2 (1 << 12)
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#define DAT3 (1 << 13)
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#define CMD (1 << 8)
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#define CLK (1 << 9)
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#define R DAT3
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#define G DAT0
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#define B DAT1
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#define Y DAT2
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#define HSYNC CMD
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#define VSYNC CLK
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/* ----- Ben hardware ------------------------------------------------------ */
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#define TIMER 7
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#define PAGE_SIZE 4096
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#define SOC_BASE 0x10000000
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static volatile uint32_t *icmr, *icmsr, *icmcr;
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static uint32_t old_icmr;
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static volatile uint32_t *clkgr, *msccdr;
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static uint32_t old_clkgr;
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static volatile uint32_t *pddats, *pddatc;
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static volatile uint32_t *pddirs, *pddirc;
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static volatile uint32_t *pdfuns, *pdfunc;
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static volatile uint32_t *tssr, *tscr;
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static volatile uint32_t *tesr, *tecr;
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static volatile uint32_t *tcsr, *tdfr, *tcnt;
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static volatile uint32_t *msc_strpcl, *msc_stat, *msc_clkrt;
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static volatile uint32_t *msc_cmdat, *msc_resto, *msc_blklen, *msc_nob;
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static volatile uint32_t *msc_cmd, *msc_arg, *msc_txfifo;
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static void disable_interrupts(void)
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{
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/*
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* @@@ Race condition alert ! If we get interrupted/preempted between
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* reading ICMR and masking all interrupts, and the code that runs
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* between these two operations changes ICMR, then we may set an
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* incorrect mask when restoring interrupts, which may hang the system.
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*/
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old_icmr = *icmr;
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*icmsr = 0xffffffff;
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}
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static void enable_interrupts(void)
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{
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*icmcr = ~old_icmr;
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}
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/*
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* @@@ Disabling the LCD clock will hang operations that depend on the LCD
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* subsystem to advance. This includes the screen saver.
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*/
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static void disable_lcd(void)
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{
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old_clkgr = *clkgr;
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*clkgr = old_clkgr | 1 << 10;
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}
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static void enable_lcd(void)
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{
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*clkgr = old_clkgr;
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}
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static void get_timer(void)
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{
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*tscr = 1 << TIMER; /* enable clock */
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*tcsr = 1; /* count at PCLK/1 */
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*tdfr = 0xffff; /* count to 0xffff */
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*tesr = 1 << TIMER;
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}
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static void release_timer(void)
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{
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*tecr = 1 << TIMER;
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*tssr = 1 << TIMER;
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}
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static void *map(off_t addr, size_t size)
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{
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int fd;
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void *mem;
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fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (fd < 0) {
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perror("/dev/mem");
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exit(1);
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}
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mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr);
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if (mem == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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return mem;
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}
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static void ben_setup(void)
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{
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volatile void *base;
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base = map(SOC_BASE, PAGE_SIZE*3*16);
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clkgr = base+0x20;
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msccdr = base+0x68;
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icmr = base+0x1004;
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icmsr = base+0x1008;
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icmcr = base+0x100c;
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pddats = base+0x10314;
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pddatc = base+0x10318;
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pdfuns = base+0x10344;
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pdfunc = base+0x10348;
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pddirs = base+0x10364;
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pddirc = base+0x10368;
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tssr = base+0x202c;
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tscr = base+0x203c;
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tesr = base+0x2014;
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tecr = base+0x2018;
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tcsr = base+0x204c+0x10*TIMER;
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tdfr = base+0x2040+0x10*TIMER;
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tcnt = base+0x2048+0x10*TIMER;
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msc_strpcl = base+0x21000;
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msc_stat = base+0x21004;
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msc_clkrt = base+0x21008;
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msc_cmdat = base+0x2100c;
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msc_resto = base+0x21010;
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msc_blklen = base+0x21018;
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msc_nob = base+0x2101c;
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msc_cmd = base+0x2102c;
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msc_arg = base+0x21030;
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msc_txfifo = base+0x2103c;
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/*
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* Ironically, switching the LCD clock on and off many times only
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* increases the risk of a hang. Therefore, we leave stop it during
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* all the measurements and only enable it again at the end.
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*/
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disable_lcd();
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get_timer();
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}
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static void cleanup(void)
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{
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release_timer();
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enable_lcd();
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}
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/* ----- Delay logic ------------------------------------------------------- */
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#define US(us) ((uint16_t) ((us)*112))
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static void until(uint16_t cycles)
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{
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while ((*tcnt & 0xffff) < cycles);
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}
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/* ----- Frame buffer output ----------------------------------------------- */
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static int line_words = 640/8;
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//static int line_cycles = US(36); /* nominally 31.77 us, but we're too slow */
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//static int line_cycles = US(32); /* nominally 31.77 us, but we're too slow */
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static int line_cycles = US(29.6); /* nominally 31.77 us, but we're too fast */
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/*
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* Note: 29.5 is already too short. Tricky timing.
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*/
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void setup(void)
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{
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mlockall(MCL_CURRENT | MCL_FUTURE);
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ben_setup();
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*pdfuns = R | G | B | Y;
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*pdfunc = VSYNC | HSYNC;
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*pddirs = VSYNC | HSYNC | R | G | B | Y;
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*pddats = VSYNC | HSYNC;
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*pddatc = R | G | B | Y;
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// *msccdr = 20; /* set the MSC clock to 336 MHz / 21 = 16 MHz */
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*msccdr = 11; /* set the MSC clock to 336 MHz / 12 = 28 MHz */
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*clkgr &= ~(1 << 7); /* enable MSC clock */
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*msc_clkrt = 0; /* bus clock = MSC clock / 1 */
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}
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static void line(const uint32_t *line, volatile const uint32_t *prefetch)
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{
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const uint32_t *p = line;
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/* Back porch */
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*tcnt = 0;
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*msc_strpcl = 1 << 3; /* reset the MSC */
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// while (*msc_stat & (1 << 15));
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/* HSYNC */
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*msc_txfifo = *p++;
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// *msc_txfifo = *p++;
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until(US(0.79));
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*pddatc = HSYNC;
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*msc_strpcl = 2; /* start MMC clock output */
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*msc_cmdat =
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(1 << 10) | /* 4 bit bus */
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(1 << 4) | /* write */
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(1 << 3) | /* with data transfer */
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1; /* R1 response */
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*msc_strpcl = 4; /* START_OP */
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#if 1
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// *msc_txfifo = *p++;
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#else
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for (p = line; p != line+1; p++)
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for (p = line; p != line+1; p++)
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*msc_txfifo = *p;//0xf0f0f0f0;//*p;
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#endif
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until(US(0.79+3.77-0.2));
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/*
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* Without the -0.2, the XEN-1510 only detects the signal in only about
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* 20% of all cases.
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*/
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/* Front porch */
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*pdfuns = CMD;
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*pddats = HSYNC;
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*pdfunc = CMD;
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// *msc_txfifo = *p++;
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// for (; p != line+4; p++)
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// *msc_txfifo = *p;//0xf0f0f0f0;//*p;
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// until(US(0.79+3.77+1.79-0.1));
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// while (p != line+32) { //line_words) {
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while (p != line+line_words) {
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uint8_t st;
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do {
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st = *msc_stat;
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if (st & 3) {
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// printf("st 0x%04x\n", st);
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bad++;
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goto fail;
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// return;
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}
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}
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while (st & (1 << 7));
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*msc_txfifo = *p;
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//*msc_txfifo = 0xf0f0f0f0;
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p++;
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}
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fail:
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//(void) *(volatile uint32_t *) (line+line_words);
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(void) *prefetch;
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until(line_cycles);
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}
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static void hdelay(int cycles)
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{
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while (cycles--) {
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*tcnt = 0;
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*pddatc = HSYNC;
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until(US(3.77));
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*pddats = HSYNC;
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until(line_cycles);
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}
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}
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static void frame(const uint32_t *f)
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{
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const uint32_t *p;
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/* VSYNC */
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*pddatc = VSYNC;
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hdelay(2);
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*pddats = VSYNC;
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/* Front porch */
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#if 0
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hdelay(32);
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#else
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hdelay(31);
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*tcnt = 0;
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*pddatc = HSYNC;
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until(US(3.77));
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*pddats = HSYNC;
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until(line_cycles-US(0.79));
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#endif
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for (p = f; p != f+240*line_words; p += line_words) {
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line(p, p);
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line(p, p+line_words);
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}
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/* Back porch */
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hdelay(14);
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}
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/* ----- Frame buffer image generation ------------------------------------- */
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#if 0
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static uint32_t pick(int set, int bit, uint32_t val)
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{
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return set == bit ? val >> 8 : 0;
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}
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static uint32_t pattern(int set, int r, int g, int b)
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{
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return pick(set, r, R) | pick(set, g, G) | pick(set, b, B);
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}
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static void tricolor(uint32_t *f)
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{
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int pairs = 2*line_pairs*240;
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int i;
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for (i = 0; i != pairs/3; i++) {
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f[i & ~1] = R;
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f[i | 1] = G | B;
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}
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for (; i != pairs*2/3; i++) {
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f[i & ~1] = G;
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f[i | 1] = R | B;
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}
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for (; i != pairs; i++) {
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f[i & ~1] = B;
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f[i | 1] = R | G;
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}
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}
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static void grid(uint8_t *f)
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{
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static uint32_t col[8] = {
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R | G | B,
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R,
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R | G,
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G,
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G | B,
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B,
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R | B,
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R | G | B,
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};
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int i, x, y;
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for (i = 0; i != 8; i++) {
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x = i*line_pairs/4+line_pairs/8;
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for (y = 0; y != 240; y++) {
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uint8_t *p = f+y*2*line_pairs+x;
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p[0] = p[1] = col[i] >> 8;
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}
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}
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}
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#endif
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static uint8_t pattern(int r, int g, int b)
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{
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return (r ? 0x88 : 0) | (g ? 0x11 : 0) | (b ? 0x22 : 0);
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}
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static void grab(uint8_t *f)
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{
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uint32_t *fb = map(0x01d00000, 4*320*240);
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int x, y;
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uint32_t pix;
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uint8_t r, g, b;
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for (y = 0; y != 240; y++)
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for (x = 0; x != 320; x++) {
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pix = *fb++;
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r = pix >> 16;
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g = pix >> 8;
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b = pix;
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*f++ = pattern(r >= thres, g >= thres, b >= thres);
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}
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}
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|
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/* ----- Command-line parsing and main loop -------------------------------- */
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static void session(int frames, int single)
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{
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uint32_t f[2*240*line_words];
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int i;
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memset(f, 0, sizeof(f));
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grab((uint8_t *) f);
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// grid(f);
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disable_interrupts();
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for (i = 0; i != frames; i++)
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frame(f);
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enable_interrupts();
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}
|
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|
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|
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static void usage(const char *name)
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{
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fprintf(stderr,
|
||||
"usage: %s frames [threshold]\n\n"
|
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" frames number of frames to display\n"
|
||||
" threshold channel on/off threshold\n\n"
|
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, name);
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exit(1);
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}
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int main(int argc, char *const *argv)
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{
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int frames;
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int single = 1;
|
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int c;
|
||||
|
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while ((c = getopt(argc, argv, "")) != EOF)
|
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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