LD3320语音识别芯片读写寄存器

wyl1115731297

请问一下采用SPI3对寄存器进行读写，读出来的都是0.
        LD_ReadReg(0x06);
        LD_WriteReg(0x35, 0x33);
        LD_WriteReg(0x1b, 0x55);
        LD_WriteReg(0xb3, 0xaa);

        u2_printf("LD_ReadReg(0x35) is %x\r\n",LD_ReadReg(0x35));
        u2_printf("LD_ReadReg(0x1b) is %x\r\n",LD_ReadReg(0x1b));
        u2_printf("LD_ReadReg(0xb3) is %x\r\n",LD_ReadReg(0xb3));

打印出来的全部是0.采用STM32F429
这是什么问题