====== MAX9296/MAX96712 6-Channel GMSL1/2 expansion card ======

===== Features  =====
The expansion card is based [[扩展卡:dual-max9296扩展卡 | Dual-channel max9296 expansion card]], capable of connecting 6 cameras:
  * Work with TI DEV boards（EVM and Starter-kit（SK））
  * MAX 6 cameras（Max9296: 2 cameras； MAX96712:4 cameras）
  * Use Max20087 to provide POC control, over voltage and current protection
  * Reserve fsync input


Other 
  * Power supply: 12-16V
  * GMSL camera (POC) 9.6- 10V
  * GMSL link indication LED。


===== Structure [3D Rendering] =====
{{ :扩展卡:max9296-96712:3d_xreal_vcu_扩展板外观_2023-09-26.png?direct&600 |}}

{{ :扩展卡:max9296-96712:3d_xreal_vcu_扩展板外观_2023-09-26_1_.png?direct&600 |}}

===== Images =====
（Expansion card with SK board, installed in case）
{{ :扩展卡:img_20231101_212609.jpg?direct&600 |}}

{{ :扩展卡:img_20231101_212708.jpg?direct&600 |}}

{{ :扩展卡:max9296-96712:img_20231101_212657.jpg?direct&600 |}}

(Work with EVM)
{{ :扩展卡:max9296-96712:微信图片_20231117180630.jpg?600 |}}

{{ :扩展卡:max9296-96712:微信图片_20231117180647.jpg?600 |}}
===== Description =====
{{ :扩展卡:max9296-96712:gmsl_6ch_tda4xx.png?direct&600 |}}

==== User Notes ====
  * Power supply (Recommend): 12-16V， Maximum:20V, Minimum: 11V。
  * GMSL POC voltage: 9.6V.
  * Current limit setting resistor for max20087 is 82K。

__**Attention：external power and mainboard power can not be connected simutanousely**__


===== Installation and Power On =====
Install the exapansion card to EVM/SK board with screw and nuts we provided. The silk print test ”evm", "sk" indicate which holes to use.

**（Description based on SK board）**
==== Installation ====
  * The distance between mainboard and expansion board is 5mm. place use copper spacers we provide (5mm length, M2.5)
  * Align QTH/QSH 40PIN B2B connector, press.
  * Align fixing holes.
  * Fasten screws.

Status of boards after installation, please refer:{{ :扩展卡:dual9296_sk_stack_v5_1.png?linkonly |}}

==== Wiring ====
The expansion board can be power with two methods:
  * Use mainboard TYPE-C port. （Use qualified power supply, QC standard, the output voltage should be 20V or 12V）
  * Use external power supply port（4pin XH2.54 wire to board connect）
  * Do not connect camera before you comfirm the power supply is normal.
Whichever method you choose, you need to short VMAIN jumper.

==== Power on ====
Connect camera Fakra cable, turn power supply on。


==== Test ====
Connect 4 cameras to max96712(1080p30, YUV422):
{{ :扩展卡:max9296-96712:捕获.png?direct&600 |}}

Connect 2 camera to max9296，4 cameras to max96712 (6 in total)：
{{ :扩展卡:max9296-96712:6ch_sync.png?direct&600 |}}

{{ :扩展卡:max9296-96712:wechat_20231117181934.mp4 |}}

===== Driver of GMSL Camera =====
See document: [[tda4系列:摄像头驱动的编译与更新 | GMSL Camera driver: compile and update]].


===== Test Applications =====
Together with the hardware, we provide a list of test application/drivers：
  * camera driver
  * application of preview camera video
  * rtos application。

**Attention：** All applications provided are for test only。

When running the application, please be noted：
  * MAX96712 use internal fsync，will output fsync signal as a fsync master.
  * The MAX9296 GPIO0/MFP0 receives fsync signal and send to camera.
  * You will need to short MAX96712/MFP2 and MAX9296/MFP0, or will not be able to get video on HDMI display.

采购后，请与技术联系获取相关源代码。
===== 注意事项 =====
   * 连接接相机之前，请先确认相机的供电电压。GMSL电源最大负载能力为 2A/9.6V。
   * 使用外接电源（通过4PIN端子）时，请注意电源的正负极。
   * 推推荐使用主板供电，即QTH/QSH端子的供电引脚
      * 对于TDA4VM starter kit, 使用标准笔记本Type-C供电时，电压为20V左右
      * 对于TDA4VM, TDA4VH 的 EVM （TI标准开发板），电压一般为 12V。
   * 相机保护芯片MAX20087的电流设置电阻（PCB标注 RI）默认为82K。
   * max9296/max96712的IO电压为QSH的VCCIO，可以通过主板拨码开关，或者GPIO控制，可以为1.8V或3.3V。外接同步触发脉冲时注意输入电平。
   * 拆装扩展板时，注意不要侧向用力，以免损坏QTH/QSH连接器。
   * 编程时，注意控制GPIO的输入/输出。 需要将GPIO设置为合适状态，使得MAX9296/MAX96712处于非reset状态。

===== 参考信息 =====
更多信息，请参考：
  * [[扩展卡:dual-max9296扩展卡]]
  * [[tda4系列:摄像头驱动的编译与更新]]

===== 问题排查 Q&A =====
 ==== 1. 检测不到解串器 ====

   * I2C是否畅通，可以用示波器检测波形确认。
   * 解串器是否置于reset状态：检查reset/gpio的电平。
   * 供电是否正常

===== 2. 检测不到串化器 =====
  * 串化器供电是否正常
  * 串化器与解串器的模式（GMSL1/GMSL2）,速率（3G/6Gbps）是否匹配。

===== 3. 检测不到相机模组的CMOS或EEPROM =====
  * 多数CMOS有reset/pwdn由串化器的gpio控制，需进行相应的配置，才能使得CMOS工作正常。
  * 

===== 3. 配置都正常，不出图 =====
  * 确认解串器是否有输出，可用示波器测量mipi信号（clk不容易测量，请测量csirx0-3）
  * 如设置同步，相机是否都已连接，同步是否正常配置。
  * CMOS的 fsync (如有）是否给定了合适的信号