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OpenHarmony:全流程講解如何編寫(xiě)RTC平臺(tái)驅(qū)動(dòng)以及應(yīng)用程序

系統(tǒng) OpenHarmony
RTC(real-time clock)為操作系統(tǒng)中的實(shí)時(shí)時(shí)鐘設(shè)備,為操作系統(tǒng)提供精準(zhǔn)的實(shí)時(shí)時(shí)間和定時(shí)報(bào)警功能。當(dāng)設(shè)備下電后,通過(guò)外置電池供電,RTC繼續(xù)記錄操作系統(tǒng)時(shí)間;設(shè)備上電后,RTC提供實(shí)時(shí)時(shí)鐘給操作系統(tǒng),確保斷電后系統(tǒng)時(shí)間的連續(xù)性。

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一、程序介紹

本程序是基于OpenHarmony標(biāo)準(zhǔn)系統(tǒng)編寫(xiě)的平臺(tái)驅(qū)動(dòng)案例:RTC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/b09_platform_device_rtc詳細(xì)資料請(qǐng)參考官網(wǎng):

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

二、基礎(chǔ)知識(shí)

1、RTC簡(jiǎn)介

RTC(real-time clock)為操作系統(tǒng)中的實(shí)時(shí)時(shí)鐘設(shè)備,為操作系統(tǒng)提供精準(zhǔn)的實(shí)時(shí)時(shí)間和定時(shí)報(bào)警功能。當(dāng)設(shè)備下電后,通過(guò)外置電池供電,RTC繼續(xù)記錄操作系統(tǒng)時(shí)間;設(shè)備上電后,RTC提供實(shí)時(shí)時(shí)鐘給操作系統(tǒng),確保斷電后系統(tǒng)時(shí)間的連續(xù)性。

2、RTC驅(qū)動(dòng)開(kāi)發(fā)

在HDF框架中,RTC的接口適配模式采用獨(dú)立服務(wù)模式,在這種模式下,每一個(gè)設(shè)備對(duì)象會(huì)獨(dú)立發(fā)布一個(gè)設(shè)備服務(wù)來(lái)處理外部訪問(wèn),設(shè)備管理器收到API的訪問(wèn)請(qǐng)求之后,通過(guò)提取該請(qǐng)求的參數(shù),達(dá)到調(diào)用實(shí)際設(shè)備對(duì)象的相應(yīng)內(nèi)部方法的目的。獨(dú)立服務(wù)模式可以直接借助HDFDeviceManager的服務(wù)管理能力,但需要為每個(gè)設(shè)備單獨(dú)配置設(shè)備節(jié)點(diǎn),增加內(nèi)存占用。
獨(dú)立服務(wù)模式下,核心層不會(huì)統(tǒng)一發(fā)布一個(gè)服務(wù)供上層使用,因此這種模式下驅(qū)動(dòng)要為每個(gè)控制器發(fā)布一個(gè)服務(wù),具體表現(xiàn)為:

  • 驅(qū)動(dòng)適配者需要實(shí)現(xiàn)HdfDriverEntry的Bind鉤子函數(shù)以綁定服務(wù)。
  • device_info.hcs文件中deviceNode的policy字段為1或2,不能為0。

(1)RTC驅(qū)動(dòng)開(kāi)發(fā)接口

為了保證上層在調(diào)用RTC接口時(shí)能夠正確的操作硬件,核心層在//drivers/hdf_core/framework/support/platform/include/rtc/rtc_core.h中定義了以下鉤子函數(shù)。驅(qū)動(dòng)適配者需要在適配層實(shí)現(xiàn)這些函數(shù)的具體功能,并與這些鉤子函數(shù)掛接,從而完成接口層與核心層的交互。
RtcMethod定義:

struct RtcMethod {
    int32_t (*ReadTime)(struct RtcHost *host, struct RtcTime *time);
    int32_t (*WriteTime)(struct RtcHost *host, const struct RtcTime *time);
    int32_t (*ReadAlarm)(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, struct RtcTime *time);
    int32_t (*WriteAlarm)(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, const struct RtcTime *time);
    int32_t (*RegisterAlarmCallback)(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, RtcAlarmCallback cb);
    int32_t (*AlarmInterruptEnable)(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, uint8_t enable);
    int32_t (*GetFreq)(struct RtcHost *host, uint32_t *freq);
    int32_t (*SetFreq)(struct RtcHost *host, uint32_t freq);
    int32_t (*Reset)(struct RtcHost *host);
    int32_t (*ReadReg)(struct RtcHost *host, uint8_t usrDefIndex, uint8_t *value);
    int32_t (*WriteReg)(struct RtcHost *host, uint8_t usrDefIndex, uint8_t value);
};

RtcMethod結(jié)構(gòu)體成員的鉤子函數(shù)功能說(shuō)明:

(2)RTC驅(qū)動(dòng)開(kāi)發(fā)步驟

RTC模塊適配HDF框架包含以下四個(gè)步驟:

  • 實(shí)例化驅(qū)動(dòng)入口。
  • 配置屬性文件。
  • 實(shí)例化RTC控制器對(duì)象。
  • 驅(qū)動(dòng)調(diào)試。

我們以//drivers/hdf_core/adapter/khdf/linux/platform/rtc/rtc_adapter.c為例(該rtc驅(qū)動(dòng)是建立于Linux rtc子系統(tǒng)基礎(chǔ)上創(chuàng)建)。

驅(qū)動(dòng)實(shí)例化驅(qū)動(dòng)入口

驅(qū)動(dòng)入口必須為HdfDriverEntry(在hdf_device_desc.h中定義)類(lèi)型的全局變量,且moduleName要和device_info.hcs中保持一致。
HDF框架會(huì)將所有加載的驅(qū)動(dòng)的HdfDriverEntry對(duì)象首地址匯總,形成一個(gè)類(lèi)似數(shù)組的段地址空間,方便上層調(diào)用。
一般在加載驅(qū)動(dòng)時(shí)HDF會(huì)先調(diào)用Bind函數(shù),再調(diào)用Init函數(shù)加載該驅(qū)動(dòng)。當(dāng)Init調(diào)用異常時(shí),HDF框架會(huì)調(diào)用Release釋放驅(qū)動(dòng)資源并退出。
rtc驅(qū)動(dòng)入口參考:

struct HdfDriverEntry g_rtcDriverEntry = {
    .moduleVersion = 1,
    .Bind = HiRtcBind,
    .Init = HiRtcInit,
    .Release = HiRtcRelease,
    .moduleName = "HDF_PLATFORM_RTC",	//【必要且與HCS文件中里面的moduleName匹配】
};
/* 調(diào)用HDF_INIT將驅(qū)動(dòng)入口注冊(cè)到HDF框架中 */
HDF_INIT(g_rtcDriverEntry);

配置屬性文件

deviceNode信息與驅(qū)動(dòng)入口注冊(cè)相關(guān),器件屬性值與核心層RTCCntlr成員的默認(rèn)值或限制范圍有密切關(guān)系。
本例只有一個(gè)RTC控制器,如有多個(gè)器件信息,則需要在device_info.hcs文件增加deviceNode信息。
本次案例以rk3568為案例(即文件//vendor/lockzhiner/rk3568/hdf_config/khdf/device_info/device_info.hcs),添加deviceNode描述,具體修改如下:

device_rtc :: device {
    device0 :: deviceNode {
        policy = 2;							// 驅(qū)動(dòng)服務(wù)發(fā)布的策略,policy大于等于1(用戶(hù)態(tài)可見(jiàn)為2,僅內(nèi)核態(tài)可見(jiàn)為1)
        priority = 30;						// 驅(qū)動(dòng)啟動(dòng)優(yōu)先級(jí)
        permission = 0644;					// 驅(qū)動(dòng)創(chuàng)建設(shè)備節(jié)點(diǎn)權(quán)限
        moduleName = "HDF_PLATFORM_RTC";	// 驅(qū)動(dòng)名稱(chēng),該字段的值必須和驅(qū)動(dòng)入口結(jié)構(gòu)的moduleName值一致
        serviceName = "HDF_PLATFORM_RTC";	// 驅(qū)動(dòng)對(duì)外發(fā)布服務(wù)的名稱(chēng),必須唯一
        deviceMatchAttr = "";				// 驅(qū)動(dòng)私有數(shù)據(jù)匹配的關(guān)鍵字,必須和驅(qū)動(dòng)私有數(shù)據(jù)配置表中的match_attr值一致
    }
}

實(shí)例化RTC控制器對(duì)象

完成屬性文件配置之后,下一步就是以核心層RtcHost對(duì)象的初始化為核心,包括驅(qū)動(dòng)適配者自定義結(jié)構(gòu)體(傳遞參數(shù)和數(shù)據(jù)),實(shí)例化RtcHost成員RtcMethod(讓用戶(hù)可以通過(guò)接口來(lái)調(diào)用驅(qū)動(dòng)底層函數(shù)),實(shí)現(xiàn)HdfDriverEntry成員函數(shù)(Bind、Init、Release)。

RtcHost成員鉤子函數(shù)結(jié)構(gòu)體RtcMethod的實(shí)例化,其他成員在Init函數(shù)中初始化。

static int32_t HiRtcReadTime(struct RtcHost *host, struct RtcTime *hdfTime);
static int32_t HiRtcWriteTime(struct RtcHost *host, const struct RtcTime *hdfTime);
static int32_t HiReadAlarm(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, struct RtcTime *hdfTime);
static int32_t HiWriteAlarm(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, const struct RtcTime *hdfTime);
static int32_t HiAlarmInterruptEnable(struct RtcHost *host, enum RtcAlarmIndex alarmIndex, uint8_t enable);
// 定義RtcMethod結(jié)構(gòu)體變量g_method,負(fù)責(zé)RTC相關(guān)接口
static struct RtcMethod g_method = {
    .ReadTime = HiRtcReadTime,
    .WriteTime = HiRtcWriteTime,
    .ReadAlarm = HiReadAlarm,
    .WriteAlarm = HiWriteAlarm,
    .RegisterAlarmCallback = NULL,
    .AlarmInterruptEnable = HiAlarmInterruptEnable,
    .GetFreq = NULL,
    .SetFreq = NULL,
    .Reset = NULL,
    .ReadReg = NULL,
    .WriteReg = NULL,
};

static int32_t HiRtcBind(struct HdfDeviceObject *device);
static int32_t HiRtcInit(struct HdfDeviceObject *device);
static void HiRtcRelease(struct HdfDeviceObject *device);
struct HdfDriverEntry g_rtcDriverEntry = {
    .moduleVersion = 1,
    .Bind = HiRtcBind,
    .Init = HiRtcInit,
    .Release = HiRtcRelease,
    .moduleName = "HDF_PLATFORM_RTC",	//【必要且與HCS文件中里面的moduleName匹配】
};
/* 調(diào)用HDF_INIT將驅(qū)動(dòng)入口注冊(cè)到HDF框架中 */
HDF_INIT(g_rtcDriverEntry);

驅(qū)動(dòng)調(diào)試

建議先在Linux下修改確認(rèn),再移植到OpenHarmony。

3、RTC應(yīng)用開(kāi)發(fā)

RTC主要用于提供實(shí)時(shí)時(shí)間和定時(shí)報(bào)警功能。

(1)接口說(shuō)明

RTC模塊提供的主要接口如表1所示,具體API詳見(jiàn)//drivers/hdf_core/framework/include/platform/rtc_if.h。

RTC驅(qū)動(dòng)API接口功能介紹如下所示:

RtcOpen

RTC驅(qū)動(dòng)加載成功后,使用驅(qū)動(dòng)框架提供的查詢(xún)接口并調(diào)用RTC設(shè)備驅(qū)動(dòng)接口。

DevHandle RtcOpen(void);

RtcOpen參數(shù)定義如下:

RtcOpen返回值定義如下:

假設(shè)系統(tǒng)中的RTC設(shè)備總線號(hào)為0,片選號(hào)為0,獲取該RTC設(shè)備句柄的示例如下:

DevHandle  handle = NULL;

/* 獲取RTC句柄 */
handle = RtcOpen();
if (handle  == NULL) {
    /* 錯(cuò)誤處理 */
}

RtcClose

銷(xiāo)毀RTC設(shè)備句柄,系統(tǒng)釋放對(duì)應(yīng)的資源。
void RtcClose(DevHandle handle);

RtcClose返回值定義如下:

RtcReadTime

系統(tǒng)從RTC讀取時(shí)間信息,包括年、月、星期、日、時(shí)、分、秒、毫秒。

int32_t RtcReadTime(DevHandle handle, struct RtcTime *time);

RtcReadTime參數(shù)定義如下:

RtcReadTime返回值定義如下:

RtcWriteTime

設(shè)置RTC時(shí)間。

int32_t RtcWriteTime(DevHandle handle, struct RtcTime *time);

RtcWriteTime參數(shù)定義如下:

RtcWriteTime返回值定義如下:

RtcReadAlarm

從rtc模塊中讀取定時(shí)報(bào)警時(shí)間。

int32_t RtcReadAlarm(DevHandle handle, enum RtcAlarmIndex alarmIndex, struct RtcTime *time);

RtcReadAlarm參數(shù)定義如下:

RtcReadAlarm返回值定義如下:

RtcWriteAlarm

根據(jù)報(bào)警索引設(shè)置RTC報(bào)警時(shí)間。

int32_t RtcWriteAlarm(DevHandle handle, enum RtcAlarmIndex  alarmIndex, struct RtcTime \*time);

RtcWriteAlarm參數(shù)定義如下:

RtcWriteAlarm返回值定義如下:

RtcRegisterAlarmCallback

系統(tǒng)啟動(dòng)后需要注冊(cè)RTC定時(shí)報(bào)警回調(diào)函數(shù),報(bào)警超時(shí)后觸發(fā)回調(diào)函數(shù)。

int32_t RtcRegisterAlarmCallback(DevHandle handle, enum RtcAlarmIndex alarmIndex, RtcAlarmCallback cb);

RtcRegisterAlarmCallback參數(shù)定義如下:

RtcRegisterAlarmCallback返回值定義如下:

RtcAlarmInterruptEnable

在啟動(dòng)報(bào)警操作前,需要先設(shè)置報(bào)警中斷使能,報(bào)警超時(shí)后會(huì)觸發(fā)告警回調(diào)函數(shù)。

int32_t RtcAlarmInterruptEnable(DevHandle handle, enum RtcAlarmIndex alarmIndex, uint8_t enable);

RtcAlarmInterruptEnable參數(shù)定義如下:

RtcAlarmInterruptEnable返回值定義如下:

(2)開(kāi)發(fā)流程

使用rtc的一般流程如下圖所示:

三、程序解析

1、準(zhǔn)備工作

無(wú)

2、Linux內(nèi)核解析

(1)創(chuàng)建Linux內(nèi)核Git

請(qǐng)參考《OpenHarmony如何為內(nèi)核打patch》(即Git倉(cāng)庫(kù)的//docs/OpenHarmony如何為內(nèi)核打patch.docx)。

(2)修改設(shè)備樹(shù)PWM7配置

修改//arch/arm64/boot/dts/rockchip/rk3568-lockzhiner-x0.dtsi(即該目錄是指已打Patch后的Linux內(nèi)核,不是OpenHarmony主目錄),具體如下所示:

&i2c5 {
	status = "okay";
	......
	
	hym8563: hym8563@51 {
		compatible = "haoyu,hym8563";
		reg = <0x51>;
		pinctrl-names = "default";
		pinctrl-0 = <&rtc_int>;

		interrupt-parent = <&gpio0>;
		interrupts = <RK_PD3 IRQ_TYPE_LEVEL_LOW>;
	};
}

設(shè)備樹(shù)中默認(rèn)是開(kāi)啟rtc模塊的hym8563,讀者不用修改。

(3)創(chuàng)建內(nèi)核patch

請(qǐng)參考《OpenHarmony如何為內(nèi)核打patch》(即Git倉(cāng)庫(kù)的//docs/OpenHarmony如何為內(nèi)核打patch.docx)。

(4)替換OpenHarmony的內(nèi)核patch

將制作出的kernel.patch替換到//kernel/linux/patches/linux-5.10/rk3568_patch/kernel.patch即可。

(5)開(kāi)啟內(nèi)核配置

修改///kernel/linux/config/linux-5.10/arch/arm64/configs/rk3568_standard_defconfig(即該目錄是指OpenHarmony主目錄),將CONFIG_DRIVERS_HDF_PLATFORM_RTC功能開(kāi)啟,具體如下所示:

CONFIG_DRIVERS_HDF_PLATFORM_RTC=y

另外,Linux配置文件中需要定義rtc設(shè)備名稱(chēng)定義,具體如下所示:

CONFIG_RTC_SYSTOHC_DEVICE="rtc0"

3、OpenHarmony配置樹(shù)配置

(1)device_info.hcs

//vendor/lockzhiner/rk3568/hdf_config/khdf/device_info/device_info.hcs已定義好,具體如下:

device_rtc :: device {
    device0 :: deviceNode {
        policy = 2;
        priority = 30;
        permission = 0644;
        moduleName = "HDF_PLATFORM_RTC";
        serviceName = "HDF_PLATFORM_RTC";
        deviceMatchAttr = "";
    }
}

注意:

  • device0是rtc模塊,一般只需要1個(gè)rtc設(shè)備即可。
  • policy必須為2,表示對(duì)內(nèi)核態(tài)和用戶(hù)態(tài)提供服務(wù)。否則,應(yīng)用程序無(wú)法調(diào)用。

4、OpenHarmony RTC平臺(tái)驅(qū)動(dòng)

在//drivers/hdf_core/adapter/khdf/linux/platform/rtc/rtc_adapter.c已編寫(xiě)對(duì)接Linux RTC驅(qū)動(dòng)的相關(guān)代碼,具體內(nèi)容如下:

static inline void HdfTimeToLinuxTime(const struct RtcTime *hdfTime, struct rtc_time *linuxTime)
{
    linuxTime->tm_sec = hdfTime->second;
    linuxTime->tm_min = hdfTime->minute;
    linuxTime->tm_hour = hdfTime->hour;
    linuxTime->tm_mday = hdfTime->day;
    linuxTime->tm_mon = hdfTime->month - MONTH_DIFF;
    linuxTime->tm_year = hdfTime->year - YEAR_BASE;
    linuxTime->tm_wday = hdfTime->weekday;
    linuxTime->tm_yday = rtc_year_days(linuxTime->tm_mday, linuxTime->tm_mon, linuxTime->tm_year);
}

static inline void LinuxTimeToHdfTime(struct RtcTime *hdfTime, const struct rtc_time *linuxTime)
{
    hdfTime->second = linuxTime->tm_sec;
    hdfTime->minute = linuxTime->tm_min;
    hdfTime->hour = linuxTime->tm_hour;
    hdfTime->day = linuxTime->tm_mday;
    hdfTime->month = linuxTime->tm_mon + MONTH_DIFF;
    hdfTime->year = linuxTime->tm_year + YEAR_BASE;
    hdfTime->weekday = linuxTime->tm_wday;
}

// 獲取Linux環(huán)境下的rtc設(shè)備接口
static inline struct rtc_device *HdfGetRtcDevice(void)
{
    // 獲取Linux環(huán)境下的rtc設(shè)備接口
    struct rtc_device *dev = rtc_class_open(CONFIG_RTC_SYSTOHC_DEVICE);
    if (dev == NULL) {
        HDF_LOGE("%s: failed to get rtc device", __func__);
    }
    return dev;
}

// 釋放Linux環(huán)境下的rtc設(shè)備接口
static inline void HdfPutRtcDevice(struct rtc_device *dev)
{
    rtc_class_close(dev);
}

static int32_t HiRtcReadTime(struct RtcHost *host, struct RtcTime *hdfTime)
{
    int32_t ret;
    struct rtc_time linuxTime = {0};
    struct rtc_device *dev = HdfGetRtcDevice();		// 獲取Linux環(huán)境下的rtc設(shè)備接口

    (void)host;
    if (dev == NULL) {
        return HDF_FAILURE;
    }
    ret = rtc_read_time(dev, &linuxTime);			// 直接對(duì)Linux環(huán)境下的rtc設(shè)備接口進(jìn)行讀操作
    if (ret < 0) {
        HDF_LOGE("%s: rtc_read_time error, ret is %d", __func__, ret);
        return ret;
    }
    HdfPutRtcDevice(dev);
    LinuxTimeToHdfTime(hdfTime, &linuxTime);
    return HDF_SUCCESS;
}

該部分代碼不細(xì)述,感興趣的讀者可以去詳讀。

5、應(yīng)用程序

(1)rtc_test.c

rtc相關(guān)頭文件如下所示:

#include "rtc_if.h"                 // rtc標(biāo)準(zhǔn)接口頭文件

主函數(shù)定義RTC接口調(diào)用,具體如下:

int main(int argc, char* argv[])
{
    int32_t ret = 0;
    DevHandle handle = NULL;
    struct RtcTime curTime;
    struct RtcTime alarmTime;

    // 獲取RTC設(shè)備句柄
    handle = RtcOpen();
    if (handle == NULL) {
        PRINT_ERROR("RtcOpen failed\n");
        return -1;
    }

    // 讀取RTC實(shí)時(shí)時(shí)間
    ret = RtcReadTime(handle, &curTime);
    if (ret != 0) {
        PRINT_ERROR("RtcReadTime failed and ret = %d\n", ret);
        goto out;
    }
    printf("RtcReadTime successful\n");
    printf("    year        = %d\n", curTime.year);
    printf("    month       = %d\n", curTime.month);
    printf("    day         = %d\n", curTime.day);
    printf("    hour        = %d\n", curTime.hour);
    printf("    minute      = %d\n", curTime.minute);
    printf("    second      = %d\n", curTime.second);
    printf("    millisecond = %d\n", curTime.millisecond);
    
    // 設(shè)置RTC時(shí)間
    curTime.year = 2023;
    curTime.month = 8;
    curTime.day = 28;
    curTime.hour = 17;
    curTime.minute = 45;
    curTime.second = 0;
    curTime.millisecond = 0;
    // 寫(xiě)RTC時(shí)間信息
    ret = RtcWriteTime(handle, &curTime);
    if (ret != 0) {
        PRINT_ERROR("RtcWriteTime failed and ret = %d\n", ret);
        goto out;
    }
    printf("RtcWriteTime successful\n");
    printf("    year        = %d\n", curTime.year);
    printf("    month       = %d\n", curTime.month);
    printf("    day         = %d\n", curTime.day);
    printf("    hour        = %d\n", curTime.hour);
    printf("    minute      = %d\n", curTime.minute);
    printf("    second      = %d\n", curTime.second);
    printf("    millisecond = %d\n", curTime.millisecond);

    // 該部分代碼,驅(qū)動(dòng)尚未完成
#if 0
    // 注冊(cè)報(bào)警A的定時(shí)回調(diào)函數(shù)
    ret = RtcRegisterAlarmCallback(handle, RTC_ALARM_INDEX_A, RtcAlarmCallback_DefaultFunc);
    if (ret != 0) {
        PRINT_ERROR("RtcRegisterAlarmCallback failed and ret = %d\n", ret);
        goto out;
    }

    // 設(shè)置RTC報(bào)警時(shí)間
    alarmTime.year = curTime.year;
    alarmTime.month = curTime.month;
    alarmTime.day = curTime.day;
    alarmTime.hour = curTime.hour;
    alarmTime.minute = curTime.minute;
    alarmTime.second = curTime.second + SLEEP_SEC;
    alarmTime.millisecond = curTime.millisecond;
    // 設(shè)置RTC_ALARM_INDEX_A索引定時(shí)器報(bào)警
    ret = RtcWriteAlarm(handle, RTC_ALARM_INDEX_A, &alarmTime);
    if (ret != 0) {
        PRINT_ERROR("RtcWriteAlarm failed and ret = %d\n", ret);
        goto out;
    }

    // 設(shè)置RTC報(bào)警中斷使能
    ret = RtcAlarmInterruptEnable(handle, RTC_ALARM_INDEX_A, 1);
    if (ret != 0) {
        PRINT_ERROR("RtcAlarmInterruptEnable failed and ret = %d\n", ret);
        goto out;
    }

    sleep(SLEEP_SEC + 5);
#endif

out:
    RtcClose(handle);
    return ret;
}

注意:由于目前rtc平臺(tái)驅(qū)動(dòng)沒(méi)有定義rtc定時(shí)器響應(yīng)函數(shù)接口,故rtc定時(shí)回調(diào)功能暫時(shí)關(guān)閉

(2)BUILD.gn

編寫(xiě)應(yīng)用程序的BUILD.gn,具體內(nèi)容如下:

import("http://build/ohos.gni")
import("http://drivers/hdf_core/adapter/uhdf2/uhdf.gni")

print("samples: compile rk3568_rtc_test")
ohos_executable("rk3568_rtc_test") {
  sources = [ "rtc_test.c" ]
  include_dirs = [
    "$hdf_framework_path/include",
    "$hdf_framework_path/include/core",
    "$hdf_framework_path/include/osal",
    "$hdf_framework_path/include/platform",
    "$hdf_framework_path/include/utils",
    "$hdf_uhdf_path/osal/include",
    "$hdf_uhdf_path/ipc/include",
    "http://base/hiviewdfx/hilog/interfaces/native/kits/include",
    "http://third_party/bounds_checking_function/include",
  ]

  deps = [
    "$hdf_uhdf_path/platform:libhdf_platform",
    "$hdf_uhdf_path/utils:libhdf_utils",
    "http://base/hiviewdfx/hilog/interfaces/native/innerkits:libhilog",
  ]

  cflags = [
    "-Wall",
    "-Wextra",
    "-Werror",
    "-Wno-format",
    "-Wno-format-extra-args",
  ]

  part_name = "product_rk3568"
  install_enable = true
}

(3)參與應(yīng)用程序編譯

編輯//vendor/lockzhiner/rk3568/samples/BUILD.gn,開(kāi)啟編譯選項(xiàng)。具體如下:

"b09_platform_device_rtc/app:rk3568_rtc_test",

四、程序編譯

建議使用docker編譯方法,運(yùn)行如下:

hb set -root .
hb set
# 選擇lockzhiner下的rk3568編譯分支。
hb build -f

五、運(yùn)行結(jié)果

運(yùn)行如下:

# rk3568_rtc_test
RtcReadTime successful
    year        = 2017
    month       = 8
    day         = 5
    hour        = 10
    minute      = 58
    second      = 9
    millisecond = 0
RtcWriteTime successful
    year        = 2023
    month       = 8
    day         = 28
    hour        = 17
    minute      = 45
    second      = 0
    millisecond = 0
#

開(kāi)發(fā)板重啟,可以發(fā)現(xiàn)系統(tǒng)相關(guān)時(shí)間已經(jīng)變更為我們案例中的配置。

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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