產品設計出來之後啊，大家使用的時候覺得反過來使用更加便捷。但是螢幕顯示是反的。那怎麼辦那？？？？？
修改硬體費時費工，那能否軟體實現那？？？？？
如果純軟體使用那就太費系統資源了。於是就想到了使用全志R528 自帶的G2D功能（硬體加速功能）。
使用它進行旋轉，後又發現uboot階段系統沒有G2D導致開機logo不能自動旋轉，核心啟動後G2D 啟動logo 又旋轉了。
（好煩啊！！！！！！！！！！！！）
於是就需要把uboot 階段手動把圖片資料旋轉過來。在G2D啟動前把uboot 傳遞給核心的logo 圖片資料也旋轉過來。
下面具體步驟：
一、開啟G2D功能。
1、由於此前公版預設在modules.mk遮蔽了屏旋轉相關設定, 如果你的版本是禁用旋轉的, 需要把相關設定去掉.
device/config/chips/r528/configs/evb1/linux-5.4/config-5.4
2759:# CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE is not set
以下3個相關選項
CONFIG_DISP2_SUNXI=m \ #CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE=y \ #CONFIG_SUNXI_DISP2_FB_ROTATION_SUPPORT=n \ #CONFIG_SUNXI_DISP2_FB_HW_ROTATION_SUPPORT=n \
修改為：
CONFIG_DISP2_SUNXI=m \
#CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE=n \
#CONFIG_SUNXI_DISP2_FB_ROTATION_SUPPORT=n \
#CONFIG_SUNXI_DISP2_FB_HW_ROTATION_SUPPORT=y \
2、硬體旋轉需要確保G2D驅動已經使能
make kernel_menuconfig Device Drivers ---> <*> SUNXI G2D Driver [*] sunxi g2d mixer module [*] sunxi g2d rotate module [] sunxi sync fence implement for rotate jobs synchronous
3.開啟顯示驅動旋轉支援
make kernel_menuconfig Device Drivers ---> Graphics support ---> Frame buffer Devices ---> Video support for sunxi ---> DISP2 Framebuffer rotation support (Disable rotation) ---> ( ) Disable rotation ( ) Software rotation support (不要選這個,方案未支援) (X) Hardware(G2D) rotation support (選擇G2D旋轉)
4.dts設定
board.dts 和 uboot-board.dts同步修改.
&disp{ ..... disp_rotation_used = <1>;/* 使能旋轉功能 */ degree0 = <2>; /* X:screen index; 0:0 degree; 1:90 degree; 3:270 degree */ fb0_width = <800>;/*fb 的長寬交換*/ fb0_height = <480>; ..... };
5.旋轉後framebuffer程式設計是需要注意,旋轉後的buffer不會直接顯示到螢幕上, 需要在應用刷屏的地方呼叫FBIOPAN_DISPLAY介面.同步旋轉後的buffer到LCD上.
以修改公版旋轉的GUI刷屏範例:
路徑:package/gui/littlevgl-6/lv_drivers/display/fbdev.c void fbdev_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_p){ .... lv_disp_flush_ready(drv); ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo); /*函數最後,在刷屏函數後面,呼叫 FBIOPAN_DISPLAY 介面*/ }
我們系統時自己的UI系統。是在重繪回撥函數中，增加FBIOPAN_DISPLAY
main()
{ int fp=0; struct fb_var_screeninfo vinfo; struct fb_fix_screeninfo finfo; fp = open("/dev/fb0", O_RDWR); if(fp < 0) { printf("Error : Can not open framebuffer device/n"); exit(1); } if(ioctl(fp, FBIOGET_VSCREENINFO, &vinfo)){ printf("Error reading variable information/n"); exit(3); } vinfo.xoffset = 0; vinfo.yoffset = 0;
} void sys_paint(void) // 每次重繪呼叫一次 { ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo); /*函數最後,在刷屏函數後面,呼叫 FBIOPAN_DISPLAY 介面*/ }
二、uboot階段手動修改旋轉圖片資料
追蹤uboot logo 執行過程
static int run_main_loop(void) { .... #ifdef CONFIG_ARCH_SUNXI initr_sunxi_plat, #endif .... } initr_sunxi_plat { .... #ifdef CONFIG_BOOT_GUI void board_bootlogo_display(void); board_bootlogo_display(); #else .... } void board_bootlogo_display(void) { .... #if defined(CONFIG_CMD_SUNXI_BMP) sunxi_bmp_display("bootlogo.bmp"); //指定bootlogo的名字。通過修改這個地方可以修改指定logo的名稱 #elif defined(CONFIG_CMD_SUNXI_JPEG) sunxi_jpeg_display("bootlogo.jpg"); #endif .... } int sunxi_bmp_display(char *name) { int ret = -1; char *argv[6]; char bmp_head[32];273 char bmp_name[32]; char part_info[16] = {0}; char size[32] = {0}; int partno = -1; unsigned long file_size = 0; char *bmp_head_addr; struct bmp_image *bmp; bmp = memalign(CONFIG_SYS_CACHELINE_SIZE, ALIGN(sizeof(struct bmp_header), CONFIG_SYS_CACHELINE_SIZE)); if (bmp) { sprintf(bmp_head, "%lx", (ulong)bmp); } else { pr_error("sunxi bmp: alloc buffer for %s fail\n", name); goto out; } partno = sunxi_partition_get_partno_byname("bootloader"); /*android*/ if (partno < 0) { partno = sunxi_partition_get_partno_byname( "boot-resource"); /*linux*/ if (partno < 0) { pr_error("Get bootloader and boot-resource partition number fail!\n"); goto free1; } } snprintf(part_info, 16, "0:%x", partno); strncpy(bmp_name, name, sizeof(bmp_name)); snprintf(size, 16, "%lx", (ulong)sizeof(struct bmp_header)); argv[0] = "fatload"; argv[1] = "sunxi_flash"; argv[2] = part_info; argv[3] = bmp_head; argv[4] = bmp_name; argv[5] = size; if (do_fat_fsload(0, 0, 6, argv)) { pr_error("sunxi bmp info error : unable to open logo file %s\n", argv[4]); goto free1; } if ((bmp->header.signature[0] != 'B') || (bmp->header.signature[1] != 'M')) { pr_error("this is not a bmp picture\n"); goto free1; } file_size = bmp->header.file_size; bmp_head_addr = memalign(CONFIG_SYS_CACHELINE_SIZE, ALIGN(file_size, CONFIG_SYS_CACHELINE_SIZE)); if (bmp_head_addr) { sprintf(bmp_head, "%lx", (ulong)bmp_head_addr); } else { pr_error("sunxi bmp: alloc buffer for %s fail\n", name); goto free1; } snprintf(size, 16, "%lx", (ulong)file_size); tick_printf("bmp_name=%s size %ld\n", bmp_name, file_size); if (do_fat_fsload(0, 0, 6, argv)) { pr_error("sunxi bmp info error : unable to open logo file %s\n", argv[4]); goto free2; } //在呼叫show_bmp_on_fb 之前將bmp_head_addr中的圖片資料進行旋轉
// 呼叫旋轉函數
rotateBMP180(bmp_head_addr);
ret = show_bmp_on_fb(bmp_head_addr, FB_ID_0); if (ret != 0) pr_error("show bmp on fb failed !%d\n", ret); free2: free(bmp_head_addr); free1: free(bmp); out: return ret; }
旋轉函數：
主要發現uboot 階段malloc不能申請太大的記憶體空間，所以程式碼中申請的行的大小。
#pragma pack(push, 1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; } BMPFileHeader; #pragma pack(pop) // 定義BMP影象資訊頭結構體 #pragma pack(push, 1) typedef struct { uint32_t header_size; int32_t width; int32_t height; uint16_t planes; uint16_t bit_count; uint32_t compression; uint32_t image_size; int32_t x_pixels_per_meter; int32_t y_pixels_per_meter; uint32_t colors_used; uint32_t colors_important; } BMPInfoHeader; #pragma pack(pop) // 旋轉BMP影象180度 void rotateBMP180(char * bmp_head_add) { // 讀取檔案頭 BMPFileHeader* file_header = (BMPFileHeader*)bmp_head_add; // 讀取影象資訊頭 BMPInfoHeader* info_header = (BMPInfoHeader*)(bmp_head_add + sizeof(BMPFileHeader)); // 獲取影象寬度、高度和每行畫素所佔位元組數 int32_t width = info_header->width; int32_t height = info_header->height; uint32_t row_size = (info_header->bit_count * width + 31) / 32 * 4; // 建立臨時緩衝區儲存旋轉後的影象資料 uint8_t* temp_data = (uint8_t*)malloc(row_size); if (temp_data == NULL) { printf("Failed to allocate memory for temporary data.\n"); return; } // 旋轉影象 for (int32_t row = 0; row < height / 2; ++row) { for (int32_t col = 0; col < width; ++col) { // 計算當前畫素位置和對應的對稱畫素位置 int32_t original_index = row * row_size + col * 3; int32_t symmetric_index = (height - 1 - row) * row_size + (width - 1 - col) * 3; // 交換畫素顏色值 uint8_t temp_red = bmp_head_add[file_header->offset + original_index]; uint8_t temp_green = bmp_head_add[file_header->offset + original_index + 1]; uint8_t temp_blue = bmp_head_add[file_header->offset + original_index + 2]; bmp_head_add[file_header->offset + original_index] = bmp_head_add[file_header->offset + symmetric_index]; bmp_head_add[file_header->offset + original_index + 1] = bmp_head_add[file_header->offset + symmetric_index + 1]; bmp_head_add[file_header->offset + original_index + 2] = bmp_head_add[file_header->offset + symmetric_index + 2]; bmp_head_add[file_header->offset + symmetric_index] = temp_red; bmp_head_add[file_header->offset + symmetric_index + 1] = temp_green; bmp_head_add[file_header->offset + symmetric_index + 2] = temp_blue; } } // 釋放臨時緩衝區記憶體 free(temp_data); }
三、kernel階段手動修改旋轉logo圖片資料
追蹤核心執行過程
disp_module_init{ ........ platform_driver_unregister(&disp_driver); #ifndef CONFIG_OF platform_device_unregister(&disp_device); #endif ........ } static int disp_probe(struct platform_device *pdev){ ........ bsp_disp_init(para); ........ } static s32 disp_init(struct platform_device *pdev) { ........ lcd_init(); bsp_disp_open(); fb_init(pdev); ........ } s32 fb_init(struct platform_device *pdev) { ........ ret = display_fb_request(i, &fb_para); ........ } static s32 display_fb_request(u32 fb_id, struct disp_fb_create_info *fb_para) { ........ Fb_map_kernel_logo(sel, info); ........ } static int Fb_map_kernel_logo(u32 sel, struct fb_info *info) { ........ paddr = bootlogo_addr; if (paddr == 0) { __inf("Fb_map_kernel_logo failed!"); return Fb_copy_boot_fb(sel, info); } ........ } static int Fb_copy_boot_fb(u32 sel, struct fb_info *info) { enum { BOOT_FB_ADDR = 0, BOOT_FB_WIDTH, BOOT_FB_HEIGHT, BOOT_FB_BPP, BOOT_FB_STRIDE, BOOT_FB_CROP_L, BOOT_FB_CROP_T, BOOT_FB_CROP_R, BOOT_FB_CROP_B, }; char *boot_fb_str = NULL; char *src_phy_addr = NULL; char *src_addr = NULL; char *src_addr_b = NULL; char *src_addr_e = NULL; int src_width = 0; int src_height = 0; int fb_height = 0; int src_bpp = 0; int src_stride = 0; int src_cp_btyes = 0; int src_crop_l = 0; int src_crop_t = 0; int src_crop_r = 0; int src_crop_b = 0; char *dst_addr = NULL; int dst_width = 0; int dst_height = 0; int dst_bpp = 0; int dst_stride = 0; int ret; unsigned long map_offset; if (info == NULL) { __wrn("%s,%d: null pointer\n", __func__, __LINE__); return -1; } boot_fb_str = (char *)disp_boot_para_parse_str("boot_fb0"); if (boot_fb_str != NULL) { int i = 0; char boot_fb[128] = { 0 }; int len = strlen(boot_fb_str); if (sizeof(boot_fb) - 1 < len) { __wrn("need bigger array size[%d] for boot_fb\n", len); return -1; } memcpy((void *)boot_fb, (void *)boot_fb_str, len); boot_fb[len] = '\0'; boot_fb_str = boot_fb; for (i = 0;; ++i) { char *p = strstr(boot_fb_str, ","); if (p != NULL) *p = '\0'; if (i == BOOT_FB_ADDR) { ret = kstrtoul(boot_fb_str, 16, (unsigned long *)&src_phy_addr); if (ret) pr_warn("parse src_phy_addr fail!\n"); } else if (i == BOOT_FB_WIDTH) { ret = kstrtou32(boot_fb_str, 16, &src_width); if (ret) pr_warn("parse src_width fail!\n"); } else if (i == BOOT_FB_HEIGHT) { ret = kstrtou32(boot_fb_str, 16, &src_height); fb_height = src_height; if (ret) pr_warn("parse src_height fail!\n"); } else if (i == BOOT_FB_BPP) { ret = kstrtou32(boot_fb_str, 16, &src_bpp); if (ret) pr_warn("parse src_bpp fail!\n"); } else if (i == BOOT_FB_STRIDE) { ret = kstrtou32(boot_fb_str, 16, &src_stride); if (ret) pr_warn("parse src_stride fail!\n"); } else if (i == BOOT_FB_CROP_L) { ret = kstrtou32(boot_fb_str, 16, &src_crop_l); if (ret) pr_warn("parse src_crop_l fail!\n"); } else if (i == BOOT_FB_CROP_T) { ret = kstrtou32(boot_fb_str, 16, &src_crop_t); if (ret) pr_warn("parse src_crop_t fail!\n"); } else if (i == BOOT_FB_CROP_R) { ret = kstrtou32(boot_fb_str, 16, &src_crop_r); if (ret) pr_warn("parse src_crop_r fail!\n"); } else if (i == BOOT_FB_CROP_B) { ret = kstrtou32(boot_fb_str, 16, &src_crop_b); if (ret) pr_warn("parse src_crop_b fail!\n"); } else { break; } if (p == NULL) break; boot_fb_str = p + 1; } } else { __wrn("no boot_fb0\n"); return -1; } dst_addr = (char *)(info->screen_base); dst_width = info->var.xres; dst_height = info->var.yres; dst_bpp = info->var.bits_per_pixel; dst_stride = info->fix.line_length; if ((src_phy_addr == NULL) || (src_width <= 0) || (src_height <= 0) || (src_stride <= 0) || (src_bpp <= 0) || (dst_addr == NULL) || (dst_width <= 0) || (dst_height <= 0) || (dst_stride <= 0) || (dst_bpp <= 0) || (src_bpp != dst_bpp)) { __wrn ("wrong para: src[phy_addr=%p,w=%d,h=%d,bpp=%d,stride=%d], dst[addr=%p,w=%d,h=%d,bpp=%d,stride=%d]\n", src_phy_addr, src_width, src_height, src_bpp, src_stride, dst_addr, dst_width, dst_height, dst_bpp, dst_stride); return -1; } map_offset = (unsigned long)src_phy_addr + PAGE_SIZE - PAGE_ALIGN((unsigned long)src_phy_addr + 1); src_addr = (char *)Fb_map_kernel_cache((unsigned long)src_phy_addr - map_offset, src_stride * src_height + map_offset); if (src_addr == NULL) { __wrn("Fb_map_kernel_cache for src_addr failed\n"); return -1; } src_addr_b = src_addr + map_offset; if ((src_crop_b > src_crop_t) && (src_height > src_crop_b - src_crop_t) && (src_crop_t >= 0) && (src_height >= src_crop_b)) { src_height = src_crop_b - src_crop_t; src_addr_b += (src_stride * src_crop_t); } if ((src_crop_r > src_crop_l) && (src_width > src_crop_r - src_crop_l) && (src_crop_l >= 0) && (src_width >= src_crop_r)) { src_width = src_crop_r - src_crop_l; src_addr_b += (src_crop_l * src_bpp >> 3); } // 旋轉圖片資料 // rotateImage180(src_addr_b, src_width, src_height, src_bpp, src_stride); if (src_height < dst_height) { int dst_crop_t = (dst_height - src_height) >> 1; dst_addr += (dst_stride * dst_crop_t); } else if (src_height > dst_height) { __wrn("src_height(%d) > dst_height(%d),please cut the height\n", src_height, dst_height); Fb_unmap_kernel(src_addr); return -1; } if (src_width < dst_width) { int dst_crop_l = (dst_width - src_width) >> 1; dst_addr += (dst_crop_l * dst_bpp >> 3); } else if (src_width > dst_width) { __wrn("src_width(%d) > dst_width(%d),please cut the width!\n", src_width, dst_width); Fb_unmap_kernel(src_addr); return -1; } src_cp_btyes = src_width * src_bpp >> 3; src_addr_e = src_addr_b + src_stride * src_height; for (; src_addr_b != src_addr_e; src_addr_b += src_stride) { memcpy((void *)dst_addr, (void *)src_addr_b, src_cp_btyes); dst_addr += dst_stride; } //再此地方旋轉修改 dst_addr = (char *)(info->screen_base); rotateImage180(dst_addr, dst_width, dst_height, dst_bpp, dst_stride); Fb_unmap_kernel(src_addr); memblock_free((unsigned long)src_phy_addr, src_stride * fb_height); free_reserved_area(__va(src_phy_addr), __va(src_phy_addr + PAGE_ALIGN(src_stride * fb_height)), 0x00, "logo buffer"); return 0; }
旋轉180函數：
放在 tina-r528\lichee\linux-5.4\drivers\video\fbdev\sunxi\disp2\disp\dev_fb.c
注意此處由於申請的記憶體空間比較大，所以用的是vmalloc
void rotateImage180(char* src_addr, int width, int height, int bpp, int stride) { // 計算每行畫素資料的位元組數 int row_bytes = width * (bpp / 8); char * src_addr_e = src_addr + stride* height; //最後的地址位置 // 建立臨時緩衝區用於儲存旋轉後的影象資料 char* temp_data = vmalloc(row_bytes * height); int y=0,x=0; // 複製旋轉後的影象資料到臨時緩衝區 for (y = 0; y < height; y++) { char* src_row_start = src_addr + (y * stride); char* dest_row_start = temp_data + ((height - 1 - y) * row_bytes); // 複製畫素資料並進行左右翻轉 for ( x = 0; x < width; x++) { char* src_pixel = src_row_start + (x * (bpp / 8)); char* dest_pixel = dest_row_start + ((width - 1 - x) * (bpp / 8)); // 複製畫素值 memcpy(dest_pixel, src_pixel, (bpp / 8)); } } //printk("----%s--%d\n",__func__,__LINE__); // 將旋轉後的影象資料寫回原始記憶體地址 for (; src_addr != src_addr_e; src_addr += stride) { //迴圈複製每一行 memcpy((void *)src_addr, (void *)temp_data, row_bytes); temp_data += row_bytes; //地址是增加地址寬度 } //printk("----%s--%d\n",__func__,__LINE__); // 釋放臨時緩衝區 vfree(temp_data); }
參考資料：
(67條訊息) uboot修改啟動logo-sunxi_u-boot啟動時改橫屏_Chasing_Chasing的部落格-CSDN部落格
【FAQ】全志F133（D1s）晶片 如何在Tina下進行顯示旋轉？ | 全志線上開發者論壇 (aw-ol.com)