Exmc on CLing

GD32 — EXMC

Tue, 08 Sep 2026 14:52:21 +0800

GD32 — EXMC

固件库: GD32F30x_Firmware_Library V3.0.3
示例数: 2

示例列表

外部 LCD — LCD
NAND Flash — NAND

GD32 EXMC — NAND Flash

Tue, 08 Sep 2026 14:52:21 +0800

EXMC — NAND Flash

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/EXMC/NAND/main.c

功能简介

本示例演示外部存储控制器。XMC/EXMC 可以连接并口 LCD、NAND Flash、SRAM 等外部总线设备，实现高速数据传输。

完整代码

#include "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#include "exmc_nandflash.h"
#define BUFFER_SIZE                 (0x100U)
#define NAND_GD_MAKERID             (0xC8U)
#define NAND_GD_DEVICEID            (0xF1U)

int main(void)
{
    /* LED initialize */
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED4);
    /* config the USART */
    gd_eval_com_init(EVAL_COM0);
    /* config the EXMC access mode */
    exmc_nandflash_init();
    /* read NAND ID */
    nand_read_id(&nand_id);

    printf("read NAND ID");
    /* print NAND ID */
    printf("\r\nNand flash ID:0x%X 0x%X 0x%X 0x%X\r\n",nand_id.maker_id,nand_id.device_id,
                                               nand_id.third_id,nand_id.fourth_id);

    if((NAND_GD_MAKERID == nand_id.maker_id) && (NAND_GD_DEVICEID == nand_id.device_id))
    {
        /* set the read and write the address */
        zone = 0;
        block = 10;
        page = 0;
        pageoffset = 1100;
        writereadaddr = ((zone * NAND_ZONE_SIZE + block) * NAND_BLOCK_SIZE + page) 
                        * NAND_PAGE_SIZE + pageoffset;

        /* whether address cross-border */
        if((writereadaddr + BUFFER_SIZE ) > NAND_MAX_ADDRESS)
        {
            printf("\r\naddress cross-border");

            /* failure, light on LED4 */
            gd_eval_led_on(LED4);
            while(1);
        }

        /* fill writebuffer with 0x00.. */
        fill_buffer_nand(txbuffer, BUFFER_SIZE , 0x00);

        /* write data to nand flash */
        status = nand_write(writereadaddr, txbuffer, BUFFER_SIZE);
        if(NAND_OK == status)
        {
            printf("\r\nwrite data successfully!");
        }
        else
        {
            printf("\r\nwrite data failure!");

            /* failure, light on LED4 */
            gd_eval_led_on(LED4);
            while(1);
        }

        /* read data from nand flash */
        status = nand_read(writereadaddr, rxbuffer, BUFFER_SIZE);
        if(NAND_OK == status)
        {
            printf("\r\nread data successfully!");
        }
        else
        {
            printf("\r\nread data failure!\n\r");

            /* failure, light on LED4 */
            gd_eval_led_on(LED4);
            while(1);
        }

        /* Read and write data comparison for equality */
        writereadstatus = 0;
        for(j = 0; j < BUFFER_SIZE; j++)
        {
            if(txbuffer[j] != rxbuffer[j])
            {
                writereadstatus++;
                break;
            }
        }

        printf("\r\nthe result to access the nand flash:");
        if (writereadstatus == 0)
        { 
            printf("\r\naccess NAND flash successfully!");

            gd_eval_led_on(LED2);
        }
        else
        { 
            printf("\r\naccess NAND flash failure!");
            
            /* failure, light on LED4 */
            gd_eval_led_on(LED4);
            while(1);
        }
        printf("\r\nprintf data to be read:\r\n");
        for(k = 0; k < BUFFER_SIZE; k ++)
        {
            printf("0x%02X ",rxbuffer[k]);
        }
    }
    else
    {
        printf("\n\rread NAND ID failure!\n\r");
        
        /* failure, light on LED4 */
        gd_eval_led_on(LED4);
        while(1);
    }

    while (1);
}

代码讲解

printf 输出：通过串口打印调试信息。需要先调用 uart_print_init 完成重定向。

GD32 EXMC — 外部 LCD

Tue, 08 Sep 2026 14:52:21 +0800

EXMC — 外部 LCD

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/EXMC/LCD/main.c

功能简介

本示例演示外部存储控制器。XMC/EXMC 可以连接并口 LCD、NAND Flash、SRAM 等外部总线设备，实现高速数据传输。

完整代码

#include "gd32f30x.h"
#include "exmc_lcd.h"
#include "ili9320.h"
#include "picture.h"

int main(void)
{
    uint16_t i;

    /* configure the EXMC access mode */
    exmc_lcd_init();

    /* read the LCD Controller device code:(0x8989) */
    device_code = lcd_register_read(0x0000);

    /* initialize the LCD */
    lcd_init();

    /* clear the LCD screen */
    lcd_clear(WHITE);
    
    /* draw the picture of Gigadevice logo */
    lcd_picture_draw(40,100,40+160-1,100+87-1,(uint16_t *)(picture + BMP_HEADSIZE));

    /* draw a rectangle */
    lcd_rectangle_draw(10,10,230,310,BLUE);

    /* configure char format */
    char_format.char_color = BLUE;
    char_format.bk_color = WHITE;
    char_format.direction = CHAR_DIRECTION_VERTICAL;
    char_format.font = CHAR_FONT_8_16;
    
    /* draw character on LCD screen */
    for (i = 0; i < sizeof(gd_website_string)-1; i++){
        lcd_char_display((50+8*i), 180+20, *(gd_website_string+i),char_format);
    }
    
    while(1){
    }
}

代码讲解

代码结构清晰，主要包含外设初始化配置和主循环中的功能逻辑。请结合注释理解每一步的含义。