steve.xu 发布的帖子

steve.xu@qq.com 谢谢

@whycan SPI 模拟的，实际测试了一下，clk能到180K左右，主要是用来控制ADC采集，速度达不到，需要2M左右的spi速率

@captain 可以看到 系统的spi1.0,cpu的spi

使用GPIO模拟SPI接口，Linux 5.4. 按照linux的binding教程配置，但是在系统的/dev目录找不到驱动

spi_gpio{
	compatible = "spi-gpio";
	ranges;
	pinctrl-0 = <&spi_gpio_pins>;
	pinctrl-names = "default";

	status = "okay";

	#address-cells = <0x1>;
	#size-cells = <0x0>;

	sck-gpios = <&pio PD 16 GPIO_ACTIVE_LOW>;
	miso-gpios = <&pio PD 17 GPIO_ACTIVE_LOW>;
	mosi-gpios = <&pio PD 18 GPIO_ACTIVE_LOW>;
	cs-gpios = <&pio PD 19 GPIO_ACTIVE_LOW>;
	
	num-chipselects = <1>;

	wavegen@0 {
        compatible = "rohm,dh2228fv";
        spi-max-frequency = <500000>;
        spi-rx-bus-width = <1>;
        spi-tx-bus-width = <1>;
        bits-per-word = <8>;
		reg = <0>;

		status = "okay";
    };
};