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fbdev.c
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fbdev.c
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/**
* @file fbdev.c
*
*/
/*********************
* INCLUDES
*********************/
#include "fbdev.h"
#if USE_FBDEV || USE_BSD_FBDEV
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#if USE_BSD_FBDEV
#include <sys/fcntl.h>
#include <sys/time.h>
#include <sys/consio.h>
#include <sys/fbio.h>
#else /* USE_BSD_FBDEV */
#include <linux/fb.h>
#endif /* USE_BSD_FBDEV */
/*********************
* DEFINES
*********************/
#ifndef FBDEV_PATH
#define FBDEV_PATH "/dev/fb0"
#endif
/**********************
* TYPEDEFS
**********************/
/**********************
* STRUCTURES
**********************/
struct bsd_fb_var_info{
uint32_t xoffset;
uint32_t yoffset;
uint32_t xres;
uint32_t yres;
int bits_per_pixel;
};
struct bsd_fb_fix_info{
long int line_length;
};
/**********************
* STATIC PROTOTYPES
**********************/
/**********************
* STATIC VARIABLES
**********************/
#if USE_BSD_FBDEV
static struct bsd_fb_var_info vinfo;
static struct bsd_fb_fix_info finfo;
#else
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
#endif /* USE_BSD_FBDEV */
static char *fbp = 0;
static long int screensize = 0;
static int fbfd = 0;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void fbdev_init(void)
{
// Open the file for reading and writing
fbfd = open(FBDEV_PATH, O_RDWR);
if(fbfd == -1) {
perror("Error: cannot open framebuffer device");
return;
}
printf("The framebuffer device was opened successfully.\n");
#if USE_BSD_FBDEV
struct fbtype fb;
unsigned line_length;
//Get fb type
if (ioctl(fbfd, FBIOGTYPE, &fb) != 0) {
perror("ioctl(FBIOGTYPE)");
return;
}
//Get screen width
if (ioctl(fbfd, FBIO_GETLINEWIDTH, &line_length) != 0) {
perror("ioctl(FBIO_GETLINEWIDTH)");
return;
}
vinfo.xres = (unsigned) fb.fb_width;
vinfo.yres = (unsigned) fb.fb_height;
vinfo.bits_per_pixel = fb.fb_depth + 8;
vinfo.xoffset = 0;
vinfo.yoffset = 0;
finfo.line_length = line_length;
#else /* USE_BSD_FBDEV */
// Get fixed screen information
if(ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
perror("Error reading fixed information");
return;
}
// Get variable screen information
if(ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
perror("Error reading variable information");
return;
}
#endif /* USE_BSD_FBDEV */
printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
// Figure out the size of the screen in bytes
screensize = finfo.line_length * vinfo.yres;
// Map the device to memory
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if((intptr_t)fbp == -1) {
perror("Error: failed to map framebuffer device to memory");
return;
}
memset(fbp, 0, screensize);
printf("The framebuffer device was mapped to memory successfully.\n");
}
void fbdev_exit(void)
{
close(fbfd);
}
/**
* Flush a buffer to the marked area
* @param drv pointer to driver where this function belongs
* @param area an area where to copy `color_p`
* @param color_p an array of pixel to copy to the `area` part of the screen
*/
void fbdev_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_p)
{
if(fbp == NULL ||
area->x2 < 0 ||
area->y2 < 0 ||
area->x1 > (int32_t)vinfo.xres - 1 ||
area->y1 > (int32_t)vinfo.yres - 1) {
lv_disp_flush_ready(drv);
return;
}
/*Truncate the area to the screen*/
int32_t act_x1 = area->x1 < 0 ? 0 : area->x1;
int32_t act_y1 = area->y1 < 0 ? 0 : area->y1;
int32_t act_x2 = area->x2 > (int32_t)vinfo.xres - 1 ? (int32_t)vinfo.xres - 1 : area->x2;
int32_t act_y2 = area->y2 > (int32_t)vinfo.yres - 1 ? (int32_t)vinfo.yres - 1 : area->y2;
lv_coord_t w = lv_area_get_width(area);
long int location = 0;
long int byte_location = 0;
unsigned char bit_location = 0;
/*32 or 24 bit per pixel*/
if(vinfo.bits_per_pixel == 32 || vinfo.bits_per_pixel == 24) {
uint32_t * fbp32 = (uint32_t *)fbp;
int32_t y;
for(y = act_y1; y <= act_y2; y++) {
location = (act_x1 + vinfo.xoffset) + (y + vinfo.yoffset) * finfo.line_length / 4;
memcpy(&fbp32[location], (uint32_t *)color_p, (act_x2 - act_x1 + 1) * 4);
color_p += w;
}
}
/*16 bit per pixel*/
else if(vinfo.bits_per_pixel == 16) {
uint16_t * fbp16 = (uint16_t *)fbp;
int32_t y;
for(y = act_y1; y <= act_y2; y++) {
location = (act_x1 + vinfo.xoffset) + (y + vinfo.yoffset) * finfo.line_length / 2;
memcpy(&fbp16[location], (uint32_t *)color_p, (act_x2 - act_x1 + 1) * 2);
color_p += w;
}
}
/*8 bit per pixel*/
else if(vinfo.bits_per_pixel == 8) {
uint8_t * fbp8 = (uint8_t *)fbp;
int32_t y;
for(y = act_y1; y <= act_y2; y++) {
location = (act_x1 + vinfo.xoffset) + (y + vinfo.yoffset) * finfo.line_length;
memcpy(&fbp8[location], (uint32_t *)color_p, (act_x2 - act_x1 + 1));
color_p += w;
}
}
/*1 bit per pixel*/
else if(vinfo.bits_per_pixel == 1) {
uint8_t * fbp8 = (uint8_t *)fbp;
int32_t x;
int32_t y;
for(y = act_y1; y <= act_y2; y++) {
for(x = act_x1; x <= act_x2; x++) {
location = (x + vinfo.xoffset) + (y + vinfo.yoffset) * vinfo.xres;
byte_location = location / 8; /* find the byte we need to change */
bit_location = location % 8; /* inside the byte found, find the bit we need to change */
fbp8[byte_location] &= ~(((uint8_t)(1)) << bit_location);
fbp8[byte_location] |= ((uint8_t)(color_p->full)) << bit_location;
color_p++;
}
color_p += area->x2 - act_x2;
}
} else {
/*Not supported bit per pixel*/
}
//May be some direct update command is required
//ret = ioctl(state->fd, FBIO_UPDATE, (unsigned long)((uintptr_t)rect));
lv_disp_flush_ready(drv);
}
/**********************
* STATIC FUNCTIONS
**********************/
#endif