以uart_tx_rx工程为例，进行如下操作可以使NVDS模块正常工作。

使用NVDS需要 将如下文件加入到当前工程参与编译：

SDK_Folder\components\libraries\hal_flash\hal_flash.c

SDK_Folder\components\sdk\linker\lib\ble_sdk.lib

SDK_Folder\drivers\src\gr55xx_hal_exflash.c

SDK_Folder\drivers\src\gr55xx_hal_xqspi.c

SDK_Folder\drivers\src\gr55xx_ll_xqspi.c

使用NVDS需要 将如下路径加入到当前工程头文件路径：

..\..\..\..\..\components\libraries\hal_flash

..\..\..\..\..\components\sdk

使用NVDS需要 引用如下头文件：

#include "hal_flash.h"

#include "gr55xx_nvds.h"

代码示例：

使用NVDS写入函数将长度10字节数组写入NVDS Item tag为0x0001的空间，并读取通过串口打印输出。

#include <stdio.h>
#include <string.h>
#include "app_log_port.h"
#include "gr55xx_hal.h"
#include "boards.h"
#include "hal_flash.h"
#include "gr55xx_nvds.h"

#define NVDS_ITEM_USER 0x0001

void nvds_test(void)
{
    uint16_t len = 0;
    uint8_t WriteBuffer[10] = {0}, ret = 0;
    
    for(uint8_t i = 0; i < 10; i++)
    {
        WriteBuffer[i] = i;
    }
    
    ret = nvds_put(NVDS_ITEM_USER, sizeof(WriteBuffer), WriteBuffer);
    
    if( ret == NVDS_SUCCESS )
    {
        printf("nvds_put SUCCESS\r\n");
        for(uint8_t i = 0; i < 10; i++)
        {
            WriteBuffer[i] = 0;
        }
        len = nvds_tag_length(NVDS_ITEM_USER);
        ret = nvds_get(NVDS_ITEM_USER, &len, WriteBuffer);
        if( ret == NVDS_SUCCESS )
        {
            printf("nvds_get SUCCESS\r\n");
            printf("NVDS 0x%X Data: ", NVDS_ITEM_USER);
            for(uint8_t i = 0; i < 10; i++)
            {
                printf("0xX ", WriteBuffer[i]);
            }
            printf("\r\n");
        }
    }
    else
    {
        printf("NVDS get error %d\r\n", ret);
    }
}

int main(void)
{
	hal_flash_init();
    nvds_init(NVDS_START_ADDR, NVDS_NUM_PAGE);
    
    hal_init();

    /* Initial printf mode and UART */
    app_log_port_init();
    
    nvds_test();
    
    printf("\r\n");
    printf("******************************************************\r\n");
    printf("*                   NVDS example.                    *\r\n");
    printf("*                                                    *\r\n");
    printf("* Config: 115200, 8-bits, 1-stopbit, none            *\r\n");
    printf("*                                                    *\r\n");
    printf("*              UART0  <----->   UART to USB          *\r\n");
    printf("*          TX(GPIO10)  ----->   RX                   *\r\n");
    printf("*          RX(GPIO11) <-----    TX                   *\r\n");
    printf("*                                                    *\r\n");
    printf("* This sample code will write and read nvds.         *\r\n");
    printf("******************************************************\r\n");
    app_log_port_flush();

    printf("\r\nThis example demo end.\r\n");

    while(1);
}

PS：如果我的回答能够帮助您解决问题，请将此问题设置为已解决，谢谢。