【鸿蒙智能硬件】（二）Windows开发环境

/**
 * @brief Enumerates GPIO directions.
 */
typedef enum {
    /** Input */
    WIFI_IOT_GPIO_DIR_IN = 0,
    /** Output */
    WIFI_IOT_GPIO_DIR_OUT
} WifiIotGpioDir;

WifiIotGpioValue，Enumerates GPIO level values

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/**
 * @brief Enumerates GPIO level values.
 */
typedef enum {
    /** Low GPIO level */
    WIFI_IOT_GPIO_VALUE0 = 0,
    /** High GPIO level */
    WIFI_IOT_GPIO_VALUE1
} WifiIotGpioValue;

WifiIotIoName，Enumerates GPIO hardware pin IDs

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/**
 * @brief Enumerates GPIO hardware pin IDs.
 */
typedef enum {
    /** GPIO hardware pin 0 */
    WIFI_IOT_IO_NAME_GPIO_0,
    /** GPIO hardware pin 1 */
    WIFI_IOT_IO_NAME_GPIO_1,
    /** GPIO hardware pin 2 */
    WIFI_IOT_IO_NAME_GPIO_2,
    /** GPIO hardware pin 3 */
    WIFI_IOT_IO_NAME_GPIO_3,
    /** GPIO hardware pin 4 */
    WIFI_IOT_IO_NAME_GPIO_4,
    /** GPIO hardware pin 5 */
    WIFI_IOT_IO_NAME_GPIO_5,
    /** GPIO hardware pin 6 */
    WIFI_IOT_IO_NAME_GPIO_6,
/** GPIO hardware pin 7 */
    WIFI_IOT_IO_NAME_GPIO_7,
    /** GPIO hardware pin 8 */
    WIFI_IOT_IO_NAME_GPIO_8,
    /** GPIO hardware pin 9 */
    WIFI_IOT_IO_NAME_GPIO_9,
    /** GPIO hardware pin 10 */
    WIFI_IOT_IO_NAME_GPIO_10,
    /** GPIO hardware pin 11 */
    WIFI_IOT_IO_NAME_GPIO_11,
    /** GPIO hardware pin 12 */
    WIFI_IOT_IO_NAME_GPIO_12,
    /** GPIO hardware pin 13 */
    WIFI_IOT_IO_NAME_GPIO_13,
    /** GPIO hardware pin 14 */
    WIFI_IOT_IO_NAME_GPIO_14,
    /** Maximum value */
    WIFI_IOT_IO_NAME_MAX,
} WifiIotIoName;

WifiIotIoFuncGpio9，Enumerates the functions of GPIO hardware pin 9.

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/**
 * @brief Enumerates the functions of GPIO hardware pin 9.
 */
typedef enum {
    /** GPIO9 function */
    WIFI_IOT_IO_FUNC_GPIO_9_GPIO,
    /** I2C0 SCL function */
    WIFI_IOT_IO_FUNC_GPIO_9_I2C0_SCL,
    /** UART2 RTS function */
    WIFI_IOT_IO_FUNC_GPIO_9_UART2_RTS_N,
    /** SDIO D2 function */
    WIFI_IOT_IO_FUNC_GPIO_9_SDIO_D2,
    /** SPI0 TXD function */
    WIFI_IOT_IO_FUNC_GPIO_9_SPI0_TXD,
    /** PWM0 OUT function */
    WIFI_IOT_IO_FUNC_GPIO_9_PWM0_OUT,
    /** I2S0 MCLK function */
    WIFI_IOT_IO_FUNC_GPIO_9_I2S0_MCLK = 7,
} WifiIotIoFuncGpio9;

2.头文件函数

在头文件\\base\iot_hardware\interfaces\kits\wifiiot_lite\wifiiot_gpio.h中，定义了GPIO功能相关操作函数：

GpioInit，Initializes the GPIO device

GpioSetDir，Sets the direction for a GPIO pin

GpioSetOutputVal，Sets the output level value for a GPIO pin

在头文件\\base\iot_hardware\interfaces\kits\wifiiot_lite\wifiiot_gpio_ex.h中，在Wi-Fi模块上提供专用设备操作接口，包括ADC、AT、闪存、GPIO、I2C、I2S、分区、PWM、SDIO、UART和看门狗：

IoSetFunc，Sets the multiplexing function for a GPIO pin

（1）GpioInit，Initializes the GPIO device设备初始化函数

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/**
 * @brief Initializes the GPIO device.
 *
 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;
 * returns an error code defined in {@link wifiiot_errno.h} otherwise.
 * @since 1.0
 * @version 1.0
 */
unsigned int GpioInit(void);

（2）IoSetFunc，Sets the multiplexing function for a GPIO pin设置GPIO功能

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/**
 * @brief Sets the multiplexing function for a GPIO pin.
 *
 * @param id Indicates the GPIO pin.
 * @param val Indicates the I/O multiplexing function. For example,
 * if the value of <b>id</b> is {@link WIFI_IOT_IO_NAME_GPIO_0},
 * the value type of <b>val</b> is {@link WifiIotIoFuncGpio0}.
 * If the value of <b>id</b> is {@link WIFI_IOT_IO_NAME_GPIO_1},
 * the value type of <b>val</b> is {@link WifiIotIoFuncGpio1}.
 * The same rule applies to other values.
 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;
 * returns an error code defined in {@link wifiiot_errno.h} otherwise.
 * @since 1.0
 * @version 1.0
 */
unsigned int IoSetFunc(WifiIotIoName id, unsigned char val);

（3）GpioSetDir，Sets the direction for a GPIO pin设备的方向（输入或者输出）

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/**
 * @brief Sets the direction for a GPIO pin.
 *
 * @param id Indicates the GPIO pin ID.
 * @param dir Indicates the GPIO input/output direction.
 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;
 * returns an error code defined in {@link wifiiot_errno.h} otherwise.
 * @since 1.0
 * @version 1.0
 */
unsigned int GpioSetDir(WifiIotGpioIdx id, WifiIotGpioDir dir);

（4）GpioSetOutputVal，Sets the output level value for a GPIO pin

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/**
 * @brief Sets the output level value for a GPIO pin.
 *
 * @param id Indicates the GPIO pin ID.
 * @param val Indicates the output level value.
 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;
 * returns an error code defined in {@link wifiiot_errno.h} otherwise.
 * @since 1.0
 * @version 1.0
 */
unsigned int GpioSetOutputVal(WifiIotGpioIdx id, WifiIotGpioValue val);

3.实现led灯亮灭的操作

实现Led灯的亮灭操作

(1)编写源代码

新建code2目录，创建文件leddemo.c

|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| #include <stdio.h> #include "ohos_init.h" #include <unistd.h> #include "wifiiot_gpio.h" #include "wifiiot_gpio_ex.h" #include "ohos_types.h" void leddemo(void) { GpioInit(); //初始化GPIO设备 IoSetFunc(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_IO_FUNC_GPIO_9_GPIO);//设置设备的功能 GpioSetDir(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_DIR_OUT);//设置设备的方向,WIFI_IOT_GPIO_DIR_OUT表示输出方向 GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_VALUE0);//设置设备的输出值，需要指定设备的名称和值，VALUE0低电位 printf("led open \n"); usleep(4000000);//点亮四秒后熄灭 GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_VALUE1);//value1是高电位 printf("led close \n"); } SYS_RUN(leddemo); |

(2)编写应用模块构建脚本 BUILD.gn(app/youdianjike /code2/BUILD.gn )

|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| static_library("ledapp") { sources = [ "leddemo.c" ] include_dirs = [ "//utils/native/lite/include", "//base/iot_hardware/interfaces/kits/wifiiot_lite" ] } |

（3）编写app目录下的BUILD.gn(/app/BUILD.gn),注册到应用子系统中

|-------------------------------------------------------------------------------------------------------------------------------------------|
| import("//build/lite/config/component/lite_component.gni") lite_component("app") { features = [ "youdianjike/code2:ledapp", ] } |

（4）编译、下载、烧写、运行

编译:python build.py wifiiot

......