PK_AVI_0HEAD
i2c_rd(sd, PK_AVI_0HEAD, buf, PK_AVI_LEN);
i2c_rd(sd, PK_AVI_0HEAD, buffer, PK_AVI_LEN);
#define PK_AVI_LEN (PK_AVI_16BYTE - PK_AVI_0HEAD + 1)