屏端MCU通过DDC通道将EDID写入949内部SRAM,然后拉高HPD通知PC读取EDID。有如下现象:
1、MCU操作DDC通道时读写都正常
2、将EDID写入后检查949-948link无异常、949_HPD为高,拉高HDMI的HPD通知PC通过DDC读取EDID,此时0xA0地址无应答:
3、测量DDC的949侧引脚电压为4.7V左右;
同一条I2C-Bus,MCU能正常操作,PC读取时却无应答。帮忙分析一下是否漏了什么点。
谢谢!
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