diff options
| -rw-r--r-- | Makefile | 6 | ||||
| -rw-r--r-- | fb.c | 96 | ||||
| -rw-r--r-- | fb.h | 6 | ||||
| -rw-r--r-- | freeonebook.c | 20 |
4 files changed, 116 insertions, 12 deletions
@@ -2,11 +2,13 @@ CC=arm-linux-gnueabihf-gcc CFLAGS=-Wall -Wextra LDFLAGS=-lpthread -freeonebook: freeonebook.o gpio.o +freeonebook: freeonebook.o gpio.o fb.o -freeonebook.o: freeonebook.c gpio.h +freeonebook.o: freeonebook.c gpio.h fb.h gpio.o: gpio.c gpio.h +fb.o: fb.c fb.h + clean: rm -f freeonebook *.o @@ -0,0 +1,96 @@ +#include <fcntl.h> +#include <stdio.h> +#include <sys/mman.h> +#include <unistd.h> + +#include <linux/fb.h> +#include <sys/ioctl.h> + +#include "fb.h" +#include "gpio.h" + +struct imx_epdc_fb_mode { + struct fb_videomode *vmode; + int vscan_holdoff; + int sdoed_width; + int sdoed_delay; + int sdoez_width; + int sdoez_delay; + int gdclk_hp_offs; + int gdsp_offs; + int gdoe_offs; + int gdclk_offs; + int num_ce; +}; + +static char *fbaddr; + +void dumpsi(const char *ctl, int io, struct fb_var_screeninfo *si) +{ + printf("- %s\n", ctl); + printf("\tioctl returned %d\n", io); + printf("\txres: %d\n", si->xres); + printf("\tyres: %d\n", si->yres); + printf("\txres_virtual: %d\n", si->xres_virtual); + printf("\tyres_virtual: %d\n", si->yres_virtual); + printf("\txoffset: %d\n", si->xoffset); + printf("\tyoffset: %d\n", si->yoffset); + printf("\tbits_per_pixel: %d\n", si->bits_per_pixel); + printf("\tgrayscale: %d\n", si->grayscale); +} + +void dumpfsi(const char *ctl, int io, struct fb_fix_screeninfo *fsi) +{ + printf("- %s\n", ctl); + printf("\tioctl returned %d\n", io); + printf("\tid: %16s\n", fsi->id); + printf("\tsmem_len: %d\n", fsi->smem_len); + printf("\ttype: %d\n", fsi->type); + printf("\ttype_aux: %d\n", fsi->type_aux); + printf("\tvisual: %d\n", fsi->visual); + printf("\txpanstep: %d\n", fsi->xpanstep); + printf("\typanstep: %d\n", fsi->ypanstep); + printf("\tywrapstep: %d\n", fsi->ywrapstep); + printf("\tline_length: %d\n", fsi->line_length); + printf("\tmmio_start: %lu\n", fsi->mmio_start); + printf("\tmmio_len: %d\n", fsi->mmio_len); + printf("\taccel: %d\n", fsi->accel); + printf("\tcapabilities: %d\n", fsi->capabilities); +} + +void fb_init(void) +{ + printf("enabling left display\n"); + gpio_set(ENABLE_LEFT_DISPLAY); + printf("enabling right display\n"); + gpio_set(ENABLE_RIGHT_DISPLAY); + + + printf("mapping framebuffer...\n"); + struct fb_var_screeninfo si = { 0 }; + + int fbfd = open("/dev/fb0", O_RDWR); + + struct fb_fix_screeninfo fsi; + int io = ioctl(fbfd, FBIOGET_FSCREENINFO, &fsi); + dumpfsi("FBIOGET_FSCREENINFO", io, &fsi); + + io = ioctl(fbfd, FBIOGET_VSCREENINFO, &si); + dumpsi("FBIOEGET_VSCREENINFO", io, &si); + + si.bits_per_pixel = 8; + si.grayscale = 1; + si.activate = FB_ACTIVATE_FORCE; + + io = ioctl(fbfd, FBIOPUT_VSCREENINFO, &si); + dumpsi("FBIOPUT_VSCREENINFO", io, &si); + + fbaddr = mmap(NULL, fsi.smem_len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fbfd, 0); + + for (unsigned int i = 0; i < fsi.smem_len; i++) { + fbaddr[i] = i % 2 == 0 ? '\0' : '\xff'; + } + + close(fbfd); + printf("at %p\n", fbaddr); +} @@ -0,0 +1,6 @@ +#ifndef FB_H +#define FB_H + +void fb_init(void); + +#endif diff --git a/freeonebook.c b/freeonebook.c index ada4c3a..8d93954 100644 --- a/freeonebook.c +++ b/freeonebook.c @@ -1,26 +1,20 @@ -#include <fcntl.h> #include <limits.h> #include <stdio.h> #include <string.h> #include <stdlib.h> -#include <sys/mman.h> #include <unistd.h> #include "gpio.h" +#include "fb.h" #define FBSIZE (1186848 * 2) #define SDPATH "/run/media/mmcblk0p1" -void enable_displays(void) -{ - printf("enabling displays\n"); - gpio_set(ENABLE_LEFT_DISPLAY); - gpio_set(ENABLE_RIGHT_DISPLAY); -} - void halt(void) { char *halt[] = { "shutdown", "-h", "now", NULL }; + fflush(NULL); + sync(); execvp(halt[0], halt); } @@ -75,10 +69,15 @@ void buttonpress(int button) int main(int argc, char *argv[]) { + printf("starting freeonebook\n"); (void)argc; (void)argv; + printf("registering atexit() handler\n"); atexit(halt); + printf("initializing gpio\n"); gpio_init(); + + printf("adding watchers\n"); gpio_watch(GPIO_LOWBATTERY, poweroff); gpio_watch(GPIO_SHUTDOWN, poweroff); gpio_watch(BUTTON_SPECIAL, buttonpress); @@ -88,7 +87,8 @@ int main(int argc, char *argv[]) gpio_watch(BUTTON_NEXTCHAPTER, buttonpress); gpio_watch(BUTTON_NEXTBOOK, buttonpress); - enable_displays(); + printf("initializing framebuffer\n"); + fb_init(); for (;;) { sleep(INT_MAX); |