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    T113-S3 uart4 选PD7, PD8引脚只能发送不能接收问题

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    • B
      bestikun LV 2 last edited by

      请教大佬, uart4选用PD7, PD8的时候只能发送不能接收, 我换回PE4, PE5就可以正常收发了.

      	uart4_pins_a: uart4_pins@0 {
      		//pins = "PE4", "PE5";	// 正常收发
      		pins = "PD7", "PD8";	// 只能发送不能接收
      		function = "uart4";
      		drive-strength = <10>;
      		bias-pull-up;
      	};
      
      	uart4_pins_b: uart4_pins@1 {
      		//pins = "PE4", "PE5";
      		pins = "PD7", "PD8";
      		function = "gpio_in";
      	};
      

      有没有可能是PD7, 8用作LVDS的原因, 但是LVDS部分的配置都注释掉了, 是否有什么遗漏了.
      有没有大佬遇到过这个问题, 谢谢.
      设备树如附件
      board.dts
      sun8iw20p1.dtsi

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      • Y
        yyyyppppp LV 5 @bestikun last edited by

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          yyyyppppp LV 5 @bestikun last edited by

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          • L
            luqq168 LV 2 last edited by

            楼主问题解决了吗,我也遇到这个问题,测量了PD8引脚电压发现只有1.5V,正常是3.3V,导致数据接收不到。不知道是不是芯片缺陷?

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            • W
              whycanservice2 LV 8 @luqq168 last edited by

              @luqq168 检查UBOOT

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              • L
                luqq168 LV 2 @whycanservice2 last edited by

                @whycanservice2 能说具体点吗,如何检查uboot呢?

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                • K
                  kimyodel LV 2 @bestikun last edited by

                  @bestikun 遇到一样的问题了,最后咋样了?

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