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trf7970a spi 通信问题 不能访问trf7970的寄存器

3.3v供电;硬件引脚I/O_2, I/O_1, and I/O_0 是按照 spi ss接线的,vdd_x和vdd_i/o,i/o1,i/o2连在一起的;

开机之后就控制en2 ,ss,en1,这三个引脚相隔时间也是按照手册上面来的,之后就发送0x03,和0x00命令;延时1ms读取0x09寄存器,但是 一直没数据;miso一直为0