SPI 触摸屏配置，CS管脚无作用

• ivan_110

  Posts: 12

  Joined: 2025-03-12 8:46

  2025-04-30 5:53

  请问，我在spi0上挂载了一个电阻触摸屏芯片tsc2046,设备树配置如下：
  /**********spi**********/
  &spi0 {
  status = "okay";
  pinctrl-names = "default";
  num-cs = <1>;
  
  pinctrl-0 = <&spi0_csn1_pins &spi0_clk_pins>;
  
  spi_touch_controller@0 {
  compatible = "ti,ads7846","ti,tsc2046";
  status = "okay";
  reg = <0>;
  spi-max-frequency = <1000000>;
  interrupt-parent = <&gpio0>;
  interrupts = <4 0>;
  pendown-gpio = <&gpio0 4 0>;
  
  ti,x-min = /bits/ 16 <0>;
  ti,x-max = /bits/ 16 <1024>;
  ti,y-min = /bits/ 16 <0>;
  ti,y-max = /bits/ 16 <1024>;
  ti,x-plate-ohms = /bits/ 16 <500>;
  ti,y-plate-ohms = /bits/ 16 <400>;
  ti,settle-delay-usec = /bits/ 16 <150>;
  
  linux,wakeup;
  };
  };
  启动时，SPI总线上有信号，能够正确初始化芯片并创建input设备，但cs管脚spi0_csn1_pins一直为高电平。是哪里出了问题？需要从何处排查？

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