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STM32MP157A driver development | 02-Use sdmmc interface to read and write sd card (hot swap)

2022-08-06 20:50:00 【Mculover666】

一、硬件原理图

二、添加设备树描述

cd引脚pinctrl描述：

&pinctrl {
    
	pinctrl-names = "default";
	pinctrl-0 = <&hog_pins_a>;

	hog_pins_a: hog-0 {
    
		pins {
    
			pinmux = <STM32_PINMUX('F', 2, GPIO)>;	/* SD1 CD */
		};
	};
};

sdmmc1接口描述：

&sdmmc1 {
    
	pinctrl-names = "default", "opendrain", "sleep";
	pinctrl-0 = <&sdmmc1_b4_pins_a>;
	pinctrl-1 = <&sdmmc1_b4_od_pins_a>;
	pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;
	cd-gpios = <&gpiof 2 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
	disable-wp;
	st,neg-edge;
	bus-width = <4>;
	vmmc-supply = <&v3v3>;
	status = "okay";
};