TI中文支持网Part Number:DS90UB962-Q1
dear Ti :
我们车机产品四路全景摄像头的解码器962需要和摄像头端ds90ub933建立30HZ的帧同步，目前帧同步模式使用basic synchronized forwarding模式，0x21寄存器配置了0x14,使用解码器的gpio1建立帧同步，目前摄像头端的gpio1也已经产生30HZ的帧同步方波， 但是只要我们切到全景倒车以后，会出现绿屏和条纹柱状，如下图所示，帮忙解释一下这种一般是什么情况导致的？ 我们的backjchannel 通道的带宽是2.5MBPS，0x1F配置的serial rate是1.6Gbps, 相对应的视频格式给到SOC端，也是正确的，但不知道为何出现绿屏和条纹柱状，麻烦TI工程师能够给出一个专业的解答， 非常感谢。
xia li：
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xia li：
条纹柱状绿图如上
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Kailyn Chen：
您好，您的问题我需要咨询下资深工程师，给您带来不便非常抱歉。
咨询之前，和您确认下，是不是在切换到全景倒车之前，图像显示都是没问题的？只有当切换到全景倒车之后，才会出现图中所示的绿屏以及柱状？
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xia li：
是的，图像显示是没问题的，但只要我们配置了解码器帧同步模式以后，就会出现上面这种情况，下面是我这边的配置，
ds90ub962_i2c_write(0x01, 0x02);//reset all digital part SENSOR_MSLEEP(20); ds90ub962_i2c_write(0x0C, 0x0F); //I2C mappings…………port EN ds90ub962_i2c_write(0x1F, 0x00); //
ds90ub962_i2c_write(0x4C,0x01); //# RX0 ds90ub962_i2c_write(0x6E,0xA0); //# BC_GPIO_CTL0: FrameSync signal to GPIO1 ds90ub962_i2c_write(0x4C,0x12); //# RX1 ds90ub962_i2c_write(0x6E,0xA0); //# BC_GPIO_CTL0: FrameSync signal to GPIO1 ds90ub962_i2c_write(0x4C,0x24); //# RX2 ds90ub962_i2c_write(0x6E,0xA0); //# BC_GPIO_CTL0: FrameSync signal to GPIO1 ds90ub962_i2c_write(0x4C,0x38); //# RX3 ds90ub962_i2c_write(0x6E,0xA0); //# BC_GPIO_CTL0: FrameSync signal to GPIO1
ds90ub962_i2c_write(0x19, 0x01); //FS_HIGH_TIME_1 ds90ub962_i2c_write(0x1A, 0x14); //FS_HIGH_TIME_0 ds90ub962_i2c_write(0x1B, 0x09); //FS_LOW_TIME_1 ds90ub962_i2c_write(0x1C, 0xbc); //FS_LOW_TIME_0
ds90ub962_i2c_write(0x18, 0x01); //ENABLE FRAME SYNC ds90ub962_i2c_write(0x4C, 0x01); //page to port RX0 ds90ub962_i2c_write(0x58, 0x58); //enable passthrough ds90ub962_i2c_write(0x5D, 0xB0); //imager slave ID = 0x30 ds90ub962_i2c_write(0x6D, 0x7f); //'set input mode
ds90ub962_i2c_write(0x4C, 0x12); //page to port RX1 ds90ub962_i2c_write(0x58, 0x58); //enable passthrough ds90ub962_i2c_write(0x5D, 0xB0); //imager slave ID = 0x30 ds90ub962_i2c_write(0x6D, 0x7f); //'set input mode
ds90ub962_i2c_write(0x4C, 0x24); //page to port RX2 ds90ub962_i2c_write(0x58, 0x58); //enable passthrough ds90ub962_i2c_write(0x5D, 0xB0); //imager slave ID = 0x30 ds90ub962_i2c_write(0x6D, 0x7f); //'set input mode
ds90ub962_i2c_write(0x4C, 0x38); //page to port RX3 ds90ub962_i2c_write(0x58, 0x58); //enable passthrough ds90ub962_i2c_write(0x5D, 0xB0); //imager slave ID = 0x30 ds90ub962_i2c_write(0x6D, 0x7f); //'set input mode
ds90ub962_i2c_write(0x4C, 0x0F); ds90ub962_i2c_write(0x0F, 0x00); //'disable GPIO input ds90ub962_i2c_write(0x4C, 0x0F); // ds90ub962_i2c_write(0x6E, 0x00); // 'set GPIO1 (nRESET) and GPIO0 (FSIN) to 0 for all four camera ds90ub962_i2c_write(0x4C, 0x01); // 'set GPIO1 of camera 0 to 1 ds90ub962_i2c_write(0x6E, 0xAA); // ' ds90ub962_i2c_write(0x4C, 0x12); // ' ds90ub962_i2c_write(0x6E, 0xAA); // 'set GPIO1 of camera 1 to 1 ds90ub962_i2c_write(0x4C, 0x24); // ' ds90ub962_i2c_write(0x6E, 0xAA); // 'set GPIO1 of camera 2 to 1 ds90ub962_i2c_write(0x4C, 0x38); // ' ds90ub962_i2c_write(0x6E, 0xAA); // 'set GPIO1 of camera 3 to 1
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Kailyn Chen：
您好，美国工程师已给出回复，您参考下：
Do you have any background on how many systems show this display this issue?
Have you tried enabling round robin forwarding using register 0x21[0], if so, does the display still show anomalies?
When writing the FWD_CTL2 register, bit 4 is being written when it's denoted as reserved, please avoid writing this register
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xia li：
好的，kailn Chen非常感谢您， 我这边再继续研究研究
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Kailyn Chen：
不客气，后续有什么问题，随时讨论。
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xia li：
对了，dear kailyn chen ， 要是同步模式 画面不通畅，那该调整哪些寄存器？
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Kailyn Chen：
您好，您指的画面不通畅，可以附上画面看下？可能和layout时阻抗不连续有关。
有测试962的输出波形吗？波形是不是连续？
