OpenIMU 330BI EVK SPI 通信异常

主控：STM32F429
IMU：openimu330BI
SPI
频率：1MHz
mode： 1 1
问题描述：
将stm32f429作为SPI master， 使用SPI传输数据时，只能成功1次，后面读取的MISO数据全为0
eg：
MOSI ： 56 00 00 00 56 00 00 00
MISO ：00 00 33 00 00 00 00 00
CS是从一开始拉低一直到传输结束后才拉高，想请问下这个原因的可能地方在哪？谢谢

@Li-YiFan

@Linuxer
pls refer to SPI description, the working process of single read is:
and you also need wait more than 16us after request command, such as: 56 00 request, and 20 us later receive the feedback.

@cek I try to delay 1ms between request command and receive feedback, but has the same feedback : 0x00 0x00

Thanks ！@cek
cs should be low in read operation，problem has solved

You are welcome.
Reminder for IMU330/300 SPI users: from SPI part in online manual

• configurations: IMU working in SPI mode; SPI mode 3(CPOL = 1 (polarity) and CPHA = 1 (phase)); Data is transmitted 16-bits words, Most Significant Bit (MSB) first;
• read and write register sequence:
  
  
• Follow the timing applies at system startup: