Topic: Problem reading and writing xram registers to a pn532 with an arduino

I've coded this part to read xram register of pn532 with libnfc 1.7.1

case 0x06: { //ReadRegister Page 76
        int address;
        uint8_t value;
        int j = 0;
        for (int i = 0; i <= 10; i += 2) {

            memcpy(&address, (int*) abtRxBuf + 7 + i, 2);

            pn532_packetbuffer[0/*1*/] = address >> 8;
            pn532_packetbuffer[1/*2*/] = address & 0xff;

            Wire.write(pn532_packetbuffer, 2);

            // read data packet
            Wire.requestFrom(PN532_I2C_ADDRESS, 0x05);

            j = 0;
            while (Wire.available() && j < 6) {
                answerSamConfig[j]/*value*/= Wire.read(); //pn532_packetbuffer[0];
                //answerSamConfig[j] = value;
                //Wire.write(value); Serial.write(value);
                j++;
            }
        }
        Wire.write(answerSamConfig, 5);
        Serial.write(answerSamConfig, 5);

        uint8_t dataSum = btDCS - sum_array(answerSamConfig, 5); //0x24;
        writePostStuff(dataSum);
        //        writeCommand(answerSamConfig, sizeof(answerSamConfig));
        break;
    }


I got this bad answer.


debug   libnfc.chip.pn53x       ReadRegister
debug   libnfc.bus.uart_win32   TX: 00 00 ff 06 fa d4 06 63 1e 63 1f 23 00
debug   libnfc.driver.pn532_uart        Read ACK
debug   libnfc.bus.uart_win32   Timeouts are set to 350 ms
debug   libnfc.bus.uart_win32   ReadFile
debug   libnfc.bus.uart_win32   RX: 00 00 ff 00 ff 00
debug   libnfc.chip.pn53x       PN53x ACKed
debug   libnfc.bus.uart_win32   Timeouts are set to 350 ms
debug   libnfc.bus.uart_win32   ReadFile
debug   libnfc.bus.uart_win32   RX: 00 00 ff 07 f9
debug   libnfc.driver.pn532_uart        Frame preamble+start code
debug   libnfc.driver.pn532_uart        Check Checksum Normal Frame, 07, f9
debug   libnfc.driver.pn532_uart        Get len from abtRxBf[3] - 2, 05
debug   libnfc.driver.pn532_uart        TFI + PD0 (CC+1)
debug   libnfc.bus.uart_win32   Timeouts are set to 350 ms
debug   libnfc.bus.uart_win32   ReadFile
debug   libnfc.bus.uart_win32   RX: d5 07
debug   libnfc.driver.pn532_uart        Check TFI d5
debug   libnfc.driver.pn532_uart        Check Command  07
debug   libnfc.driver.pn532_uart        Get len 05
debug   libnfc.bus.uart_win32   Timeouts are set to 350 ms
debug   libnfc.bus.uart_win32   ReadFile
debug   libnfc.bus.uart_win32   RX: 00 80 80 80 80
debug   libnfc.driver.pn532_uart        Wait 2 more bytes
debug   libnfc.bus.uart_win32   Timeouts are set to 350 ms
debug   libnfc.bus.uart_win32   ReadFile
debug   libnfc.bus.uart_win32   RX: 24 00
debug   libnfc.driver.pn532_uart        Check btDCS  24
debug   libnfc.driver.pn532_uart        Check Postamble  00
Received bits:

Found tag with
UID: 00000000
ATQA: 0000
SAK: 00

My question is : how to access pn532 register with an arduino ?
Many other command are working well in my code, this part is critical
Thank you