====== 使用starter-kit开发RTOS应用 ======

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TI推出的 edgeai starter-kit （后称为SK板） 是一款针对边缘AI的开发板，针对Linux开发者设计，用户不需要了解底层RTOS的框架即可进行AI应用的开发。

与TI的官方EVM使用同一SDK进行开发，使得我们有可能通过简单的配置，将EVM的开发环境及开发步骤应用于SK板。

===== Linux SDK的修改 =====
默认SK板的硬件都由Linux控制，包括DP显示， CSIRX的mipi输入，i2c接口等。

通过GPIO控制使能HDMI显示端口，但是在Linux中禁用HDMI.

> //您可能需要登陆才能查看下方代码//
<nodisp>
<code dts b/arch/arm64/boot/dts/ti/k3-j721e-sk.dts>

@@ -260,6 +272,22 @@
 		};
 	};
 
+//enable HDMI port.
+	hdmi_pdn {
+		compatible = "gpio-leds";
+		status = "okay";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&hdmi_pdn_pins_default>;
+
+		hdmi_pdn {
+			lable = "hdmi_pdn_ctrl";
+			gpios = <&main_gpio0 127 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+	};
+
 	hdmi-connector {
 		compatible = "hdmi-connector";
 		label = "hdmi";
@@ -286,11 +314,11 @@
 		#size-cells = <0>;
 		compatible = "ti,tfp410";
 
-		pinctrl-names = "default";
-		pinctrl-0 = <&hdmi_pdn_pins_default>;
+		// pinctrl-names = "default";
+		// pinctrl-0 = <&hdmi_pdn_pins_default>;
 
 		/* HDMI_PDn */
-		powerdown-gpios = <&main_gpio0 127 GPIO_ACTIVE_LOW>;
+		// powerdown-gpios = <&main_gpio0 127 GPIO_ACTIVE_LOW>;
 
 		port@0 {
 			reg = <0>;
</code>
</nodisp>

禁用相关外设, 并配置CSIRX端口至QSH-ti cam接口，而不是 raspberry pi camera 接口。

<code dts /arch/arm64/boot/dts/ti/k3-j721e-edgeai-apps.dts.dts>
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * edgeai-apps: device-tree overlay
+ *
+ * Copyright (C) 2019 - 2021 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include "k3-j721e-rtos-memory-map.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/pinctrl/k3.h>
+
+&main_i2c3 {
+	status = "disabled";
+};
+
+&serdes_wiz4 {
+	status = "disabled";
+};
+
+&mhdp {
+	status = "disabled";
+};
+
+&dss {
+	status = "disabled";
+};
+
+// &main_i2c1 {
+// 	status = "disabled";
+// };
+
+&ti_csi2rx0 {
+	status = "disabled";
+};
+
+&ti_csi2rx1 {
+	status = "disabled";
+};
+
+
+&main_pmx0 {
+	main_rpi_cam0_reset_pins_default: main-rpi-cam0-reset-pins-default {
+		pinctrl-single,pins = <
+			J721E_IOPAD(0x1D4, PIN_OUTPUT, 7) /* (Y3) SPI1_CS0 */
+		>;
+	};
+
+	main_rpi_cam1_reset_pins_default: main-rpi-cam1-reset-pins-default {
+		pinctrl-single,pins = <
+			J721E_IOPAD(0x1E0, PIN_OUTPUT, 7) /* (Y5) SPI1_D0 */
+		>;
+	};
+
+	main_csi_mux_sel2_pins_default: main-csi-mux-sel2-pins-default {
+		pinctrl-single,pins = <
+			J721E_IOPAD(0x164, PIN_OUTPUT, 7) /* (V29) RGMII5_TD2 */
+		>;
+	};
+};
+
+&main_gpio0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_csi_mux_sel2_pins_default>;
+
+	csi-mux-hog {
+		/* CSI_MUX_SEL_2 */
+		gpio-hog;
+		gpios = <88 GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "CSI_MUX_SEL_2";
+	};
+
+	csi-rstz {
+		/* CSI_MUX_SEL_2 */
+		gpio-hog;
+		gpios = <78 GPIO_ACTIVE_LOW>;
+		output-high;
+		line-name = "CSI_CAM_RSTz";
+	};
+};
</code>
===== RTOS SDK的修改 =====

使用HDMI进行显示
<code c app_cfg_mcu2_0.h>
#ifdef BUILD_MCU_BOARD_DEPENDENCIES

    #define ENABLE_CSI2RX
    #define ENABLE_CSI2TX

    /* IMPORANT NOTE:
     * - Only one of ENABLE_DSS_SINGLE or ENABLE_DSS_DUAL should be defined
     * - When ENABLE_DSS_SINGLE is defined, only one of ENABLE_DSS_HDMI or ENABLE_DSS_EDP should be defined
     * - When ENABLE_DSS_DUAL is defined, ENABLE_DSS_HDMI and ENABLE_DSS_EDP are not used, both EDP and HDMI are enabled unconditionally
     */
    #define ENABLE_DSS_SINGLE
    #define ENABLE_DSS_HDMI

    /* define below to enable eDP display,
       make sure to undef ENABLE_DSS_HDMI & ENABLE_DSS_DSI as well */
    //#define ENABLE_DSS_EDP
    #undef ENABLE_DSS_EDP
    /* define below to enable HDMI display,
       make sure to undef ENABLE_DSS_EDP & ENABLE_DSS_DSI as well */
    //#undef ENABLE_DSS_HDMI
    /* define below to enable DSI display, make sure to undef ENABLE_DSS_HDMI
       & ENABLE_DSS_EDP as well */
    #undef ENABLE_DSS_DSI

    #define ENABLE_I2C
    #define ENABLE_BOARD

#else
</code>

修改makefile，编译SK版的mcu2.0固件

<code make>

# Inter-core virtual ethernet support
# Supported Values: yes | no
ifneq (,$(filter yes,$(BUILD_CPU_MCU2_0)))
ifeq ($(BUILD_QNX_A72),yes)
ETHFW_INTERCORE_ETH_SUPPORT?=no
else
ETHFW_INTERCORE_ETH_SUPPORT?=yes
endif
endif

#do

BUILD_EDGEAI?=yes

# If set to no, then MCU core firmware will be built with NO board dependencies
# (such as I2C, board specific PINMUX, DSS, HDMI, I2C, ETHFW, CSIRX, CSITX).  Most of
# the packaged vision_apps require these interfaces on the MCU for the EVM, but
# when porting to a board other than an EVM, or using applications which control
# these interfaces from the HLOS on A72 (such as EdgeAI kit), then this should be set
# to 'no'.
BUILD_MCU_BOARD_DEPENDENCIES?=yes

ifeq ($(BUILD_EDGEAI), yes)
#BUILD_MCU_BOARD_DEPENDENCIES=yes   #vivozhang
FIRMWARE_SUBFOLDER=vision_apps_eaik
UENV_NAME=uEnv_$(SOC)_edgeai_apps.txt
endif

ifeq ($(BUILD_MCU_BOARD_DEPENDENCIES),no)
BUILD_ENABLE_ETHFW=no
endif

BUILD_ENABLE_ETHFW=no

# Need to export this variable so that the following xdc .cfg file can pick this up from the env:
# ${PSDK_PATH}/vision_apps/platform/$(SOC)/rtos/mcu2_0/mcu2_0.cfg
export BUILD_ENABLE_ETHFW

# A72 OS specific Build flag
BUILD_LINUX_A72?=yes
BUILD_QNX_A72?=no
</code>

增加gpio的pinmux配置
<code c vision_apps/utils/misc/src/app_pinmux.c>
static pinmuxPerCfg_t gGpio0PinCfg[] =
{
    /* GpioCamCtrl -> GPIO0_64 -> AD28 */
    {
        PIN_PRG0_PRU1_GPO1, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_74 -> AG26 */
    {
        PIN_PRG0_PRU1_GPO11, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_75 -> AF27 */
    {
        PIN_PRG0_PRU1_GPO12, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_76 -> AF26 */
    {
        PIN_PRG0_PRU1_GPO13, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_77 -> AE25 */
    {
        PIN_PRG0_PRU1_GPO14, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_78 -> AF29 */
    {
        PIN_PRG0_PRU1_GPO15, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    /* GpioCamCtrl -> GPIO0_79 -> AG29 */
    {
        PIN_PRG0_PRU1_GPO16, PIN_MODE(7) | \
        ((PIN_PULL_DISABLE | PIN_INPUT_ENABLE) & (~PIN_PULL_DIRECTION))
    },
    {PINMUX_END}
};

static pinmuxModuleCfg_t gGpioPinCfg[] =
{
    {0, TRUE, gGpio0PinCfg},
    {PINMUX_END}
};



static pinmuxPerCfg_t gI2c3PinCfg[] =
{
    /* camCtrl -> I2C3_SCL -> T26 */
    {
        PIN_MMC2_CLK, PIN_MODE(4) | \
        ((PIN_PULL_DIRECTION | PIN_INPUT_ENABLE) & (~PIN_PULL_DISABLE))
    },
    /* camCtrl -> I2C3_SDA -> T25 */
    {
        PIN_MMC2_CMD, PIN_MODE(4) | \
        ((PIN_PULL_DIRECTION | PIN_INPUT_ENABLE) & (~PIN_PULL_DISABLE))
    },
    {PINMUX_END}
};


static pinmuxModuleCfg_t gI2cPinCfg[] =
{
    {3, TRUE, gI2c3PinCfg},
    {PINMUX_END}
};


static pinmuxBoardCfg_t gBasicDemoPinmuxDataInfo[] =
{
    {0, gDispPinCfg},
    {1, gCaptPinCfg},
    // {2, gGpioPinCfg},
    {2, gI2cPinCfg},
    {PINMUX_END}
};



</code>