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