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OpenHarmony：如何使用HDF驅(qū)動(dòng)控制LED燈

系統(tǒng) OpenHarmony
RGB LED燈整體硬件電路如下圖所示,硬件電路中包含了三個(gè)GPIO控制管腳控制RGB　LED燈，低電平點(diǎn)亮LED燈，高電平熄滅LED燈。電路簡(jiǎn)單，這邊不對(duì)此進(jìn)行多余的說(shuō)明。

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一、程序簡(jiǎn)介

該程序是基于OpenHarmony標(biāo)準(zhǔn)系統(tǒng)編寫(xiě)的基礎(chǔ)外設(shè)類：RGB LED。

目前已在凌蒙派-RK3568開(kāi)發(fā)板跑通。詳細(xì)資料請(qǐng)參考官網(wǎng)：https://gitee.com/Lockzhiner-Electronics/lockzhiner-rk3568-openharmony/tree/master/samples/b02_hdf_rgb_led。

詳細(xì)資料請(qǐng)參考OpenHarmony官網(wǎng)：

  • GPIO平臺(tái)驅(qū)動(dòng)開(kāi)發(fā)
  • GPIO應(yīng)用程序開(kāi)發(fā)

二、硬件設(shè)計(jì)

RGB LED燈整體硬件電路如下圖所示,硬件電路中包含了三個(gè)GPIO控制管腳控制RGB　LED燈，低電平點(diǎn)亮LED燈，高電平熄滅LED燈。電路簡(jiǎn)單，這邊不對(duì)此進(jìn)行多余的說(shuō)明。

三、程序解析

1、目錄結(jié)構(gòu)

b02_hdf_rgb_led
├── config              # HDF資源配置文件目錄
    ├── config.hcs      # 接口IO配置文件
    ├── device_info.hcs # 設(shè)備信息配置文件
├── drivers             # 內(nèi)核HDF驅(qū)動(dòng)程序目錄
    ├── rgb_led_drv.c   # 內(nèi)核HDF驅(qū)動(dòng)程序
    ├── Makefile        # 內(nèi)核HDF驅(qū)動(dòng)編譯腳本
├── figures             # MD文檔圖片
├── BUILD.gn            # GN文件
├── rgb_led.c           # 應(yīng)用層控制程序

2、內(nèi)核HDF驅(qū)動(dòng)程序

（1）接口函數(shù)

  • 函數(shù)名：HdfRgbLedDriverInit.
  • 功能說(shuō)明：HDF初始化注冊(cè)，讀取HDF資源配置文件，獲取三色燈控制GPIO管腳。
int32_t HdfRgbLedDriverInit(struct HdfDeviceObject *deviceObject)
{
    if (deviceObject == NULL) {
        HDF_LOGE("g_rgbLedDriverEntry: %s failed", __func__);
        return HDF_ERR_INVALID_OBJECT;
    }
    struct DeviceResourceIface *CfgOps = NULL;
    CfgOps = DeviceResourceGetIfaceInstance(HDF_CONFIG_SOURCE);
    if (CfgOps == NULL || CfgOps->GetUint32 == NULL) {
        HDF_LOGE("%s: DeviceResourceGetIfaceInstance failed", __func__);
        return HDF_FAILURE;
    }
    if (CfgOps->GetUint32(deviceObject->property, "rgb_led_version", &g_rgbLedCfg.rgb_led_version, 0) != HDF_SUCCESS) {
        HDF_LOGE("%s: read rgb_led_version failed", __func__);
        return HDF_FAILURE;
    }
    if (CfgOps->GetUint32(deviceObject->property, "rgb_led_red", &g_rgbLedCfg.rgb_led_red, 0) != HDF_SUCCESS) {
        g_rgbLedCfg.rgb_led_version = 0;
        HDF_LOGE("%s: read rgb_led_red failed", __func__);
        return HDF_FAILURE;
    }
    if (CfgOps->GetUint32(deviceObject->property, "rgb_led_green", &g_rgbLedCfg.rgb_led_green, 0) != HDF_SUCCESS) {
        g_rgbLedCfg.rgb_led_version = 0;
        HDF_LOGE("%s: read rgb_led_green failed", __func__);
        return HDF_FAILURE;
    }
    if (CfgOps->GetUint32(deviceObject->property, "rgb_led_blue", &g_rgbLedCfg.rgb_led_blue, 0) != HDF_SUCCESS) {
        g_rgbLedCfg.rgb_led_version = 0;
        HDF_LOGE("%s: read rgb_led_blue failed", __func__);
        return HDF_FAILURE;
    }
    HDF_LOGI("g_rgbLedDriverEntry: %s success", __func__);
    return HDF_SUCCESS;
}
  • 函數(shù)名：HdfRgbLedDriverRelease。
  • 功能說(shuō)明：HDF去注冊(cè)。
void HdfRgbLedDriverRelease(struct HdfDeviceObject *deviceObject)
{
    if (deviceObject == NULL) {
        HDF_LOGE("g_rgbLedDriverEntry: %s failed", __func__);
        return;
    }
    HDF_LOGI("g_rgbLedDriverEntry: %s success", __func__);
    return;
}
  • 函數(shù)名：HdfRgbLedDriverBind。
  • 功能說(shuō)明：HDF綁定解析函數(shù)。
int32_t HdfRgbLedDriverBind(struct HdfDeviceObject *deviceObject)
{
    if (deviceObject == NULL) {
        HDF_LOGE("g_rgbLedDriverEntry: %s failed", __func__);
        return HDF_ERR_INVALID_OBJECT;
    }
    static struct IDeviceIoService ledDriverServ = {
        .Dispatch = rgbLedDriverDispatch,
    };
    deviceObject->service = (struct IDeviceIoService *)(&ledDriverServ);
    HDF_LOGI("g_rgbLedDriverEntry: %s success NodeName[%s]", __func__,
        deviceObject->property->name);
    return HDF_SUCCESS;
}
  • 函數(shù)名：rgbLedDriverDispatch。
  • 功能說(shuō)明：解析函數(shù)，解析應(yīng)用層下發(fā)的命令，執(zhí)行命令對(duì)應(yīng)操作，RGB_LED_WRITE控制三色燈亮滅。
int32_t rgbLedDriverDispatch(struct HdfDeviceIoClient *client, int32_t cmdId,
    struct HdfSBuf *dataBuf, struct HdfSBuf *replyBuf)
{
    int32_t result = HDF_FAILURE;
    int32_t rgbLedMode = 0;

    if (client == NULL || client->device == NULL) {
        HDF_LOGE("driver device is NULL");
        return HDF_ERR_INVALID_OBJECT;
    }
    if (g_rgbLedCfg.rgb_led_version != RGB_LED_VERSION) {
        HDF_LOGE("driver rgb_led_version not match");
        return HDF_FAILURE;
    }
    switch (cmdId) {
        case RGB_LED_WRITE:
            result = HdfSbufReadInt32(dataBuf, &rgbLedMode);
            if (result) {
                HDF_LOGI("%s: mode:[0x%X][%s%s%s]", __func__, rgbLedMode,
                    (rgbLedMode&RGB_LED_RED_BIT)?"R":"-",
                    (rgbLedMode&RGB_LED_GREEN_BIT)?"G":"-",
                    (rgbLedMode&RGB_LED_BLUE_BIT)?"B":"-");

                LedGpioCtrl(g_rgbLedCfg.rgb_led_red, (rgbLedMode&RGB_LED_RED_BIT)?LED_ON:LED_OFF);
                LedGpioCtrl(g_rgbLedCfg.rgb_led_green, (rgbLedMode&RGB_LED_GREEN_BIT)?LED_ON:LED_OFF);
                LedGpioCtrl(g_rgbLedCfg.rgb_led_blue, (rgbLedMode&RGB_LED_BLUE_BIT)?LED_ON:LED_OFF);
            }
            break;
        default:
            HDF_LOGE("%s: receiving unknown command", __func__);
            break;
    }
    return result;
}
  • 函數(shù)名：LedGpioCtrl。
  • 功能說(shuō)明：LED GPIO控制函數(shù)，低電平點(diǎn)亮LED，高電平熄滅LED。
static int32_t LedGpioCtrl(uint16_t gpio, int32_t mode)
{
    uint16_t level = GPIO_VAL_HIGH;

    if (HDF_SUCCESS != GpioSetDir(gpio, GPIO_DIR_OUT)) {
        HDF_LOGE("%s: GpioSetDir failed", __func__);
        return HDF_FAILURE;
    }

    if (mode == LED_ON) {
        level = GPIO_VAL_LOW;
    } else if (mode == LED_OFF) {
        level = GPIO_VAL_HIGH;
    }

    if (HDF_SUCCESS != GpioWrite(gpio, level)) {
        HDF_LOGE("%s: GpioWrite failed", __func__);
        return HDF_FAILURE;
    }
    return HDF_SUCCESS;
}

3、應(yīng)用層程序

（1）應(yīng)用層代碼分析

程序啟動(dòng)后獲取命令行參數(shù)，如果命令行不帶參數(shù)，RGB三色燈運(yùn)行跑馬燈；如果命令行帶參數(shù)，根據(jù)傳入的參數(shù)的低三位映射點(diǎn)亮對(duì)應(yīng)的紅燈、綠燈和藍(lán)燈；通過(guò)HdfIoServiceBind綁定RGB三色燈HDF服務(wù)，獲取HDF空間緩沖區(qū)，向緩沖區(qū)寫(xiě)入需要控制的RGB三色燈低三位數(shù)據(jù)，通過(guò)RGB_LED_WRITE命令下發(fā)到HDF驅(qū)動(dòng)中，從而控制RGB三色燈亮滅。程序運(yùn)行結(jié)束，回收HDF空間緩沖區(qū)和HDF服務(wù)。

int main(int argc, char* argv[])
{
    int ret = HDF_SUCCESS;
    int32_t mode = -1;
    if (argc == ARGS_NUM) {
        mode = atoi(argv[1]);
        /*low-3bits*/
        mode &= 0x7;
        HILOG_INFO(LOG_APP, "[%s] main enter: mode[%s%s%s][0x%X]",
            LOG_TAG,
            (mode&RGB_LED_BLUE_BIT)?"B":"-",
            (mode&RGB_LED_GREEN_BIT)?"G":"-",
            (mode&RGB_LED_RED_BIT)?"R":"-",
            mode);
        printf("RGB mode[%s%s%s][0x%X]\n",
            (mode&RGB_LED_BLUE_BIT)?"B":"-",
            (mode&RGB_LED_GREEN_BIT)?"G":"-",
            (mode&RGB_LED_RED_BIT)?"R":"-",
            mode);
    } else {
        HILOG_INFO(LOG_APP, "[%s] main enter: auto test RGB LED", LOG_TAG);
        printf("auto test RGB LED\n");
    }

    struct HdfIoService *serv = HdfIoServiceBind(RGB_LED_SERVICE_NAME);
    if (serv == NULL) {
        HILOG_ERROR(LOG_APP, "get service %s failed", RGB_LED_SERVICE_NAME);
        return -1;
    }
    struct HdfSBuf *data = HdfSbufObtainDefaultSize();
    if (data == NULL) {
        HILOG_ERROR(LOG_APP, "obtain data failed");
        return -1;
    }

    if (mode == -1) {
        mode = 0x8;
        while (mode) {
            HdfSbufFlush(data);
            if (!HdfSbufWriteInt32(data, --mode)) {
                HILOG_ERROR(LOG_APP, "write data failed");
                return -1;
            }
            ret = serv->dispatcher->Dispatch(&serv->object, RGB_LED_WRITE, data, NULL);
            sleep(1);
        }
    } else {
        if (!HdfSbufWriteInt32(data, mode)) {
            HILOG_ERROR(LOG_APP, "write data failed");
            return -1;
        }
        ret = serv->dispatcher->Dispatch(&serv->object, RGB_LED_WRITE, data, NULL);
    }

    HdfSbufRecycle(data);
    HdfIoServiceRecycle(serv);
    HILOG_INFO(LOG_APP, "[%s] main exit.", LOG_TAG);

    return ret;
}

四、運(yùn)行程序

系統(tǒng)啟動(dòng)后，命令行運(yùn)行命令：

rgb_led

五、運(yùn)行結(jié)果

運(yùn)行結(jié)果：

# rgb_led
auto test RGB LED

# rgb_led 1
RGB mode[--R][0x1]
# rgb_led 2
RGB mode[-G-][0x2]
# rgb_led 3
RGB mode[-GR][0x3]
# rgb_led 4
RGB mode[B--][0x4]
# rgb_led 5
RGB mode[B-R][0x5]
# rgb_led 6
RGB mode[BG-][0x6]
# rgb_led 7
RGB mode[BGR][0x7]

想了解更多關(guān)于開(kāi)源的內(nèi)容，請(qǐng)?jiān)L問(wèn)：

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責(zé)任編輯：jianghua 來(lái)源： 51CTO 開(kāi)源基礎(chǔ)軟件社區(qū)
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