https://www.analog.com/media/en/technical-documentation/user-guides/gmsl2-general-user-guide.pdf

https://www.analog.com/media/en/technical-documentation/data-sheets/max96752.pdf

https://www.analog.com/media/en/technical-documentation/data-sheets/max9295d.pdf

GMSL2 General User Guide

Key Features

• Four-wire main (connects to remote peripheral) or four-wire subordinate (connects to µC/SoC).

• Remote-side SPI bus supports SPI modes 0 or 3; local-side SPI bus supports SPI mode 0.

• Device filtering on (multiple SPI interfaces with different SPI IDs) or off (point-to-point SPI interface).

• Subordinate Select active low or high.

• 600kHz to 25MHz or 50MHz SPI clock (depending on device).

• MSB first (for control commands).

• Pin or I2C control of RO and BNE input/output.

18.Serial Peripheral Interface

18.3.3.1 SPI Burst Write

1. Set RO.
2. Send 0xA0 (Set SPI Target = 0, optional if only one device).
3. Send 0xA4/A5 (Assert SS1/SS2).
4. Clear RO.
5. Send Cmd Byte (Read/Write and Address MS bit).
6. Send Addrs Byte.
7. Send Write Byte.
8. Set RO.
9. Wait for BNE = 1.
10. Send 0xA6/Read Byte (Discard).
11. Clear RO.
12. Repeat 7 - 11 until all data is written.
13. Set RO.
14. Wait for BNE = 1.
15. Send 0xA6/Read Byte (Discard) (Clear SS).
16. Send 0xA6/Read Byte (Discard) (Clear SS).

18.3.3.2 SPI Burst Read

1. Set RO.
2. Send 0xA0 (Set SPI Target = 0, optional if only one device).
3. Send 0xA4/A5 (Assert SS1/SS2).
4. Clear RO.
5. Send Cmd Byte (Read/Write and Address MS bit).
6. Send Addrs Byte.
7. Set RO.
8. Wait for BNE = 1.
9. Send 0xA7/Read Byte (Read Data) (Discard first two reads, remaining are valid).
10. Repeat Steps 8 - 9 until all but two bytes are read.
11. Wait for BNE = 1.
12. Send 0xA6/Read Byte (Valid Data) (Clear SS).
13. Send 0xA6/Read Byte (Last Valid Data) (Clear SS).

硬件框图

SPI 初始化

详细寄存器描述可以参考官网提供的 DataSheet

SPI mode 0 的波形

SPI mode 3 配置

0x172 设置 0x0C OK

错误的配置：0x172 设置 0x04