RK3399实现uart、rs232、rs485以及接口光耦保护电路

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ZXjsy|

楼主 | 2025-7-7 10:17 | 只看该作者 |只看大图回帖奖励

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RK3399, RS, RS485, UART, rs232

rk3399 串口不够用，参考设计中增加了wk2124这颗拓展芯片，可以转出4路串口，电路如下

dts配置只需要3步1、关闭uart4
&uart4 {
      status = "disabled";
2、wk2124挂到spi1上面
&spi1 {
      status = "okay";
            spi_wk2xxx: spi_wk2xxx@00{
            status = "okay";
            compatible = "jinghong,spi-wk2xxx";
            reg = <0x00>;
            spi-max-frequency = <10000000>;
   // power-gpio = <&gpio2 4 GPIO_ACTIVE_HIGH>;
            //reset-gpio = <&gpio1 17 GPIO_ACTIVE_HIGH>;
      reset-gpio = <&gpio1 19 GPIO_ACTIVE_HIGH>;
      irq-gpio = <&gpio1 2 IRQ_TYPE_EDGE_FALLING>;
      cs-gpio = <&gpio1 10 GPIO_ACTIVE_HIGH>;
            /* rk3399 driver support SPI_CPOL | SPI_CPHA | SPI_CS_HIGH */
            //spi-cpha;             /* SPI mode: CPHA=1 */
            //spi-cpol;          /* SPI mode: CPOL=1 */
            //spi-cs-high;
      };
3、检查gpio复用

max232电路