QSPI 双屏 ST77916 LCD 异显

此次适配的 QSPI 屏为 W180TE010I-18Z ，使用的是 QSPI 4 线模式进行驱动。

屏幕 1 这里使用 QSPI2，位于 PD1~PD6 上，引脚配置如下：

V821	TFT 模块
PD1	QSPI-CS
PD2	QSPI-CLK
PD3	QSPI-D0
PD4	QSPI-D1
PD5	QSPI-D3
PD6	QSPI-D2
PL6	RESET
3V3	VCC
GND	GND

屏幕 2 这里使用 QSPI1，位于 PD14~PD19 上，引脚配置如下：

V821	TFT 模块
PD14	QSPI-CS
PD15	QSPI-CLK
PD16	QSPI-D0
PD17	QSPI-D1
PD18	QSPI-D3
PD19	QSPI-D2
PL7	RESET
3V3	VCC
GND	GND

勾选驱动

Allwinner BSP  --->
	Device Drivers  --->
		Video Drivers  --->
			SPI LCD Panel Drivers  --->
				<*> LCD FB Driver Support (SPI LCD)
					LCD FB Panels select  --->
						[*] LCD support ST77916 QSPI panel

配置设备树

&pio {
	spi1_pins_default: spi1@0 {
		pins = "PD14", "PD15", "PD16", "PD17", "PD18", "PD19"; /* CS, SCK, D0, D1, D3, D2 */
		function = "spi1";
		allwinner,drive = <3>;
	};

	spi1_pins_sleep: spi1@1 {
		pins = "PD14", "PD15", "PD16", "PD17", "PD18", "PD19";
		function = "io_disabled";
	};

	spi2_pins_default: spi2@0 {
		pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6"; /* CS, SCK, D0, D1, D3, D2 */
		function = "spi2";
		allwinner,drive = <3>;
	};

	spi2_pins_sleep: spi2@3 {
		pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6";
		function = "io_disabled";
	};
};

&lcd_fb {
	status = "okay";
	port {
		#address-cells = <1>;
		#size-cells = <0>;
		spi_panel0: endpoint@0 {
			reg = <0>;
			remote-endpoint = <&panel_st7789v_spi1>;
		};
		spi_panel1: endpoint@1 {
			reg = <1>;
			remote-endpoint = <&panel_st7789v_spi2>;
		};
	};
};

&spi1 {
	pinctrl-0 = <&spi1_pins_default>;
	pinctrl-1 = <&spi1_pins_sleep>;
	pinctrl-names = "default", "sleep";
	clock-frequency = <150000000>;
	sunxi,spi-bus-mode = <SUNXI_SPI_BUS_MASTER>;
	sunxi,spi-cs-mode = <SUNXI_SPI_CS_SOFT>;
	status = "okay";

	panel_st7789v_spi1: slave@0 {
		device_type = "spi-panel";
		compatible = "allwinner,spi-panel";
		reg = <0x0>;
		spi-max-frequency = <150000000>;
		spi-rx-bus-width = <4>;
		spi-tx-bus-width = <4>;
		lcd_used = <1>;
		lcd_driver_name = "st77916_qspi";
		lcd_if = <2>;
		lcd_dbi_if = <0>;
		lcd_qspi_if = <2>;
		lcd_data_speed_hz = <118153846>;
		lcd_x = <360>;
		lcd_y = <360>;
		lcd_pixel_fmt = <10>;
		lcd_dbi_fmt = <2>;
		lcd_rgb_order = <0>;
		lcd_width = <60>;
		lcd_height = <60>;
		lcd_pwm_used = <0>;
		lcd_pwm_ch = <6>;
		lcd_pwm_freq = <5000>;
		lcd_pwm_pol = <1>;
		lcd_frm = <1>;
		lcd_gamma_en = <1>;
		fb_buffer_num = <2>;
		lcd_backlight = <100>;
		lcd_fps = <60>;
		lcd_dbi_te = <0>;
		lcd_dbi_clk_mode = <0>;
		lcd_gpio_0 = <&rtc_pio PL 7 GPIO_ACTIVE_LOW>;
		status = "okay";
	};
};

&spi2 {
	pinctrl-0 = <&spi2_pins_default>;
	pinctrl-1 = <&spi2_pins_sleep>;
	pinctrl-names = "default", "sleep";
	clock-frequency = <150000000>;
	sunxi,spi-bus-mode = <SUNXI_SPI_BUS_MASTER>;
	sunxi,spi-cs-mode = <SUNXI_SPI_CS_SOFT>;
	status = "okay";

	panel_st7789v_spi2: slave@0 {
		device_type = "spi-panel";
		compatible = "allwinner,spi-panel";
		reg = <0x0>;
		spi-max-frequency = <150000000>;
		spi-rx-bus-width = <4>;
		spi-tx-bus-width = <4>;
		lcd_used = <1>;
		lcd_driver_name = "st77916_qspi";
		lcd_if = <2>;
		lcd_dbi_if = <0>;
		lcd_qspi_if = <2>;
		lcd_data_speed_hz = <118153846>;
		lcd_x = <360>;
		lcd_y = <360>;
		lcd_pixel_fmt = <10>;
		lcd_dbi_fmt = <2>;
		lcd_rgb_order = <0>;
		lcd_width = <60>;
		lcd_height = <60>;
		lcd_pwm_used = <0>;
		lcd_pwm_ch = <6>;
		lcd_pwm_freq = <5000>;
		lcd_pwm_pol = <1>;
		lcd_frm = <1>;
		lcd_gamma_en = <1>;
		fb_buffer_num = <2>;
		lcd_backlight = <100>;
		lcd_fps = <60>;
		lcd_dbi_te = <0>;
		lcd_dbi_clk_mode = <0>;
		lcd_gpio_0 = <&rtc_pio PL 6 GPIO_ACTIVE_LOW>;
		status = "okay";
	};
};

功能测试

启动后可以执行 ls /dev 查看 framebuffer 节点。

修改 LVGL

配置 LVGL 色深 RGB565，反转 byte，修改文件 platform/thirdparty/gui/lvgl-8/lv_examples/src/lv_conf.h

/*Color depth: 1 (1 byte per pixel), 8 (RGB332), 16 (RGB565), 32 (ARGB8888)*/
#define LV_COLOR_DEPTH 16

/*Swap the 2 bytes of RGB565 color. Useful if the display has an 8-bit interface (e.g. SPI)*/
#define LV_COLOR_16_SWAP 1

LVGL 需要编译两个版本，一个在 fb0 显示，一个在 fb1 显示。

编辑 platform/thirdparty/gui/lvgl-8/lv_examples/src/lv_drv_conf.h，将 fb0 修改为 fb1

勾选 LVGL，运行测试

lv_examples 1
lv_examples_fb1 1

屏幕可以正常显示，帧率正确即可。