NT3H2111/2211 NFC tag Interface with rk3568

[hfkjdsjl]

rk platform connects NT3H2111_2211 on i2c; I want to write data to NT3H2111_2211 via i2c in user mode application, but it cannot write; The read data always looks like the following:

Is there read/write protection? What should I configure or do before writing data to NT3H2111_2211 via i2c? What should I configure or do before reading data from NT3H2111_2211 via i2c?

Development board ：rk3568

Here's the demo, shown below

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>

#define I2C_FILE_NAME   "/dev/i2c-3"
#define I2C_ADDR    0x55

int fd;

int i2c_open()
{
    fd = open(I2C_FILE_NAME, O_RDWR);
    if(fd < 0){
        perror("Unable to open i2c controlfile");
        return 1;
    }
    printf("open %s success\n", I2C_FILE_NAME);
    return 0;
}

int i2c_write(int fd, unsigned char dev_addr, unsigned char reg_addr, unsigned charval)
{

    unsigned char buf[2];
    struct i2c_rdwr_ioctl_data data;
    struct i2c_msg messages;
    buf[0] = reg_addr;
    buf[1] = charval;
    messages.addr = dev_addr;  //device address
    messages.flags = 0;    //write
    messages.len = 2;
    messages.buf = buf;  //data address
    data.msgs = &messages;
    data.nmsgs = 1;
    if(ioctl(fd, I2C_RDWR, &data) < 0){
        printf("write ioctl err\n");
        return 1;
    } else {
        //printf("write 0x%x success\n",charval);
    }
    usleep(1000);
    return 1;
}

int i2c_read(int fd, unsigned char addr, unsigned char reg, unsigned char *val)
{
    struct i2c_rdwr_ioctl_data data;
    struct i2c_msg messages[2];
    messages[0].addr = addr;  //device address
    messages[0].flags = 0;    //write
    messages[0].len = sizeof(reg);
    messages[0].buf = &reg;  //data address
    messages[1].addr = addr;       //device address
    messages[1].flags = I2C_M_RD;  //read
    messages[1].len = sizeof(val);
    messages[1].buf = val; 
    data.msgs = messages;
    data.nmsgs = 2;
    if(ioctl(fd, I2C_RDWR, &data) < 0){
        printf("read ioctl err\n");   
        return 1;
    }
    return 0;
}

int main()
{
    unsigned int i;
    unsigned char buf[128];
    unsigned char val[] = {
		0xAA, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00,
		0xE1, 0x10, 0x6D, 0x00,
		0x03, 0x5F, 0x91, 0x02,
		0x35, 0x53, 0x70, 0x91,
		0x01, 0x14, 0x54, 0x02,
		0x65, 0x6E, 0x4E, 0x54,
		0x41, 0x47, 0x20, 0x49,
		0x32, 0x43, 0x20, 0x45,
		0x58, 0x50, 0x4C, 0x4F,
		0x52, 0x45, 0x52, 0x51,
		0x01, 0x19, 0x55, 0x01,
		0x6E, 0x78, 0x70, 0x2E,
		0x63, 0x6F, 0x6D, 0x2F,
		0x64, 0x65, 0x6D, 0x6F,
		0x62, 0x6F, 0x61, 0x72,
		0x64, 0x2F, 0x4F, 0x4D,
		0x35, 0x35, 0x36, 0x39,
		0x54, 0x0F, 0x13, 0x61,
		0x6E, 0x64, 0x72, 0x6F,
		0x69, 0x64, 0x2E, 0x63,
		0x6F, 0x6D, 0x3A, 0x70,
		0x6B, 0x67, 0x63, 0x6F,
		0x6D, 0x2E, 0x6E, 0x78,
		0x70, 0x2E, 0x6E, 0x74,
		0x61, 0x67, 0x69, 0x32,
		0x63, 0x64, 0x65, 0x6D,
		0x6F, 0xFE, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00};
    i2c_open();
    memset(buf, 0,  128);
    for(i = 0; i < 0xef; i++){
        if(i2c_read(fd, I2C_ADDR, i,&buf[i])){
            printf("Unable to get register!\n");
        }
    }
    for(i=0; i< 0xef;i++) {
        printf("buf[%d]=-0x%02x  ",i,buf[i]);
        if (!(i % 9))
            printf("\n");
    }
    printf("---------write-------------before--------\n");
    printf("************write************begin************\n");
    for(i = 0; i < sizeof(val); i++) {
        i2c_write(fd, I2C_ADDR, i, val[i]);
    }
    printf("************write************end************\n");
    printf("---------write-------------after----to read----\n");
    memset(buf, 0,  128);
    for(i = 0; i < 0xef; i++){
        if(i2c_read(fd, I2C_ADDR, i,&buf[i])){
            printf("Unable to get register!\n");
        }
    }
    for(i=0; i< 0xef;i++) {
        printf("[%d]=0x%02x  ",i,buf[i]);
        if (!(i % 9))
            printf("\n");
    }
    close(fd);
    return 0;
}