GD32F303 flash memory

GD32f303 FLASH

chip	macro	Total RAM capacity	FLASH size	Page		startup file
GD32F303RCT6	GD32F30x_HD	48K	（256K）		Belongs to high-density products (256K~512K)	startup_gd32f30x_hd.s
GD32F303RET6	GD32F30x_HD	64K	（256K+256K）		Belongs to high-density products (256K~512K)	startup_gd32f30x_hd.s
GD32f303RGT6	GD32F30x_XD	96K	（256K+768K）	0 ~ 127, 256 ~ 448 pages	Belongs to ultra-high density products (greater than 512K)	startup_gd32f30x_xd.s
GD32F305xx GD32F307xx	GD32F30x_CL				connected product	startup_gd32f30x_cl.s

• For GD32F30x_CL and GD32F30x_XD, two flash memories are used, the first 512KB capacity is in the first flash memory (bank0), and the subsequent capacity is in the second flash memory (bank1);
• In the first 256K bytes of flash memory, the CPU executes instructions with zero waiting time, and outside this range, there is a long delay for the CPU to read instructions;
• For GD32F30x_CL and GD32F30x_HD whose main storage flash memory capacity is not more than 512KB, only bank0 is used.
• For GD32F30x_CL and - GD32F30x_HD, GD32F30x_XD, the flash page size of bank0 is 2KB, and the flash page size of bank1 is 4KB;

FLASH read and write operations

video link

Store the picture data and font library in the specified flash address

Use chip GD32f303RGT6

FLASH address distribution

For GD32, if there is a slow FLASH behind, put the static resources on blank1.

Use scatter loading

Method 1 (specify address when defining)

Define the LVGL image image_comp_map (image for storing symbols) array to 0X8040000

const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST LV_ATTRIBUTE_IMG_IMAGE_COMP uint8_t image_comp_map[] __attribute__((at(0X8040000))) = {
    
    
}

Define the LVGL picture image_language_map (image for storing symbols) array to 0X8042000

const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST LV_ATTRIBUTE_IMG_IMAGE_LANGUAGE uint8_t image_language_map[] __attribute__((at(0X8042000))) = {
    
    
}

Define the LVGL image image_laser_map (image for storing symbols) array to 0X8044000

const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST LV_ATTRIBUTE_IMG_IMAGE_LASER uint8_t image_laser_map[] __attribute__((at(0X8044000))) = {
    
    
}

Define the LVGL image image_rotate_map (image for storing symbols) array to 0X8046000

const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST LV_ATTRIBUTE_IMG_IMAGE_ROTATE uint8_t image_rotate_map[] __attribute__((at(0X8046000))) = {
    
    
}

Define the array of LVGL image image_touch_map (image for storing symbols) to 0X8048000

const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST LV_ATTRIBUTE_IMG_IMAGE_TOUCH uint8_t image_touch_map[] __attribute__((at(0X8048000))) = {
    
    
}

Define the array of LVGL fonts (images storing symbols) to 0X804A000

static LV_ATTRIBUTE_LARGE_CONST const uint8_t gylph_bitmap[] __attribute__((at(0X8040000))) = {
    
    
  /* U+20 " " */
    0x0,

    /* U+2b "+" */
    0x0, 0x1, 0xe5, 0x0, 0x0, 0x0, 0x1e, 0x50,
    0x0, 0x0, 0x1, 0xe5, 0x0, 0x7, 0xaa, 0xbf,
    0xca, 0xa7, 0x7a, 0xab, 0xfc, 0xaa, 0x70, 0x0,
    0x1e, 0x50, 0x0, 0x0, 0x1, 0xe5, 0x0, 0x0,
    0x0, 0x1e, 0x50, 0x0,

    /* U+2d "-" */
    0x7a, 0xaa, 0xaa, 0xaa, 0x77, 0xaa, 0xaa, 0xaa,
    0xa7,
};

View the map file, the font array (global variable area) and image array (static local variable) are stored in the specified address

Method 2 (using scatter-loading files)

LR_IROM1 0x08000000 0x00040000  {
    
        ; load region size_region
  ER_IROM1 0x08000000 0x00040000  {
    
      ; load address = execution address
   *.o (RESET, +First)
   *(InRoot$$Sections)
   .ANY (+RO)
   .ANY (+XO)
  }
  RW_IRAM1 0x20000000 0x00018000  {
    
      ; RW data
   .ANY (+RW +ZI)
  }
}

LR_IROM2 0x08040000 0x000c0000   {
    
                  ;load region size_region
  ER_IROM2 0x08040000 0x000c0000 {
    
                  ;load address = execution address
    lcd.O (LCD_Clear) 						
    ili9320.O(ili9320_Initializtion)        ; ili9320.O 表示函数所在的文件生成的.O 文件
    ili9320.O(ili9320_Clear)                ;ili9320_Clear 表示需要分散加载的目标，名字可以随，
  }                                           ;为了方便区分，我们都按照原本的函数名或者是数组名命名。
} 

Add a section declaration to the function, and add the following code outside the function definition.

void LCD_Clear(void) __attribute__((section ("LCD_Clear")));
void ili9320_Initializtion(void) __attribute__((section ("ili9320_Initializtion")));
void ili9320_Clear(void) __attribute__((section ("ili9320_Clear")));