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PN532 i2c communication issue

Question asked by Jacky Wu on Aug 2, 2017
Latest reply on Oct 16, 2017 by hongfeng jiang

I had bought a PN532 module to try on a lock design. I used STM32 as my host controller and set the PN532 module in i2c mode. First at all, i try to read firmware version. i send a command packet as below.

      buffer = {0x00,0x00,0xff,0x02,0xfe,0xd4,0x02,0x2a,0x00}                  

First sending slave address with write command was okay, host controller can get ack correctly. But following byte 0x00 can't get ack, always is nack. Is someone have same question? Did i missing boot up sequence? I can't find it in user manual. HELP!!