STM32MP157A驱动开发 | 02-使用sdmmc接口读写sd卡（热插拔）

Posted 2022-08-09 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";
;

三、测试