物联网系统中不同状态的指示灯软件设计分享

状态指示灯是最常见的一种人机交互方式。常用做法是，通过不同的闪烁频率，来告知用户，目前设备所处的状态，是正常，故障，还是其它状态。

指示灯的额定工作电压有220，110，48，36，24，12，6，3V等。受控制电路通过电流大小的限制，同时也为了延长灯泡的使用寿命，常采取在灯泡前加一限流电阻或用两只灯泡串联使用，以降低工作电压。

嵌入式中的指示灯通常情况下都和主控电压等级一致，部分场景可能会是5V，12V等。

指示灯可以有常亮，常闭，闪动三种状态。其中常亮和常闭最简单，只需要在合适的时候将灯点亮，或者关闭，就可以实现，程序逻辑不复杂，只需要调用一次GPIO的写函数就可以。但是闪动状态就不同了，闪烁的频率不同，代表的状态不同。如何实现指示灯按照不同的频率闪烁呢？

1延时函数

指示灯按照不同频率闪烁，最简单的办法就是使用延时函数，不同的延时来实现不同的闪烁频率，例如有如下的代码实现：

LED(on);//打开led

delay(100);//延时100ms

LED(off);//关闭led

delay(900);//延时900ms

上述代码实现了1s内，亮100ms，灭900ms。

这种办法，如果在裸机情况下无法使用，因为延时会导致cpu一直卡在延时函数，无法进行正常运行。因此延时函数的办法，只适用于在使用rtos的情况下，可以单独创建一个任务，来实现LED不同频率的闪动。

2定时器中断

假设我们指示灯的闪烁频率不同，可能是100ms，可能是500ms。那我们可以实现一个100ms的定时器，在定时器中，配合计数，来实现不同频率的闪动。例如：

time_callback（）

{

if(count==0)

{

LED(on);

}

Elseif(count10)

{

LED(off);

}

count++;

if(count=10)

{

Count=0;

}

}

上述代码是一个定时器回调函数，定时器每100ms超时后，会进入time_callback中。第一次进入count的值是0，这时候指示灯被点亮。之后9次进入回调函数，指示灯都会被关闭。当第10次执行回调函数时，count会被清零。重新进入一次循环。如此循环往复。

本组件实现的就是第二种方法。当然实际代码可能比示例要稍微复杂些。但是道理是类似的。

Demo位于amaziot_bloom_os_sdk\sample\libraries\8.1_led_status

Gitee源码地址：

Github源码地址：

编译指令：.\\amaziot_bloom_os_sdk\sample\libraries\8.1_led_status

应于于空开等需要状态指示灯的项目中。可以控制设备在不同状态下，LED以不同的频率进行闪烁。从而向用户指示当前设备工作的状态。

功能：该函数用于，改变LED亮灭状态。

参数：无

返回值：无

示例：

lib_led_status_level_flip();

功能：该函数用于，初始化LEDGPIO和定时器。

参数：无

返回值：无

示例：

lib_led_status_init();

功能：该函数用于，LED常亮。

参数：无

返回值：无

示例：

lib_led_status_lighting();

功能：该函数用于，100ms闪烁1次。

参数：无

返回值：无

示例：

lib_led_status_100ms_flashing1();

功能：该函数用于，100ms闪烁两次。

参数：无

返回值：无

示例：

lib_led_status_100ms_flashing2();

功能：该函数用于，100ms闪烁三次。

参数：无

返回值：无

示例：

lib_led_status_100ms_flashing3();

功能：该函数用于，间隔1s闪烁。

参数：无

返回值：无

示例：

lib_led_status_1s_flashing();

功能：该函数用于，间隔100ms闪烁。

参数：无

返回值：无

示例：

lib_led_status_100ms_flashing2();

功能：该函数用于，工厂模式闪烁。

参数：无

返回值：无

示例：

lib_led_status_factory();

功能：该函数用于，定时器回调函数，根据不同模式调用不同的api。

参数：无

返回值：无

示例：

lib_led_status_timer_cbk(NOTLIVE);

复制3.2-inter_at示例工程，到同一个文件夹下，修改文件名为8.2_power_alarm，如图：

4.2修改makefile

增加文件组件所在目录头文件路径，和源文件路径，如图：

4.3增加头文件

使用代码编辑器，将新建的工程文件加入代码编辑器中，打开，修改，加入等头文件，如图：

4.4修改代码

在Phase2Inits_exit创建一个任务，如图：

4.5宏定义介绍

sample_led_status_uart_printf

输出日志到DEBUG串口，日志比较少，可以输出到这个串口，如果日志比较多，需要输出到usb口，以免不必要的问题出现

sample_led_status_catstudio_printf

输出日志到USB串口，使用catstudio查看，catstudio查看日志需要更新对应版本文件，软件打开filtter过滤日志，只查看用户输出的日志

SAMPLE_LED_STATUS_TASK_STACK_SIZE

栈空间宏定义

SAMPLE_LED_STATUS_TASK_STACK_SIZE

任务栈空间，本例使用数组实现，用户在做项目时，可以预先估算下当先任务需要的大致栈空间，OS没有提供可以查看栈空间使用情况的API

sample_led_status_task_ref

任务指针

Phase1Inits_enter

底层初始化，本例空

Phase1Inits_exit

底层初始化，本例空

Phase2Inits_enter

底层初始化，本例空

Phase2Inits_exit

创建主任务，初始化消息队列，定时器，任务等。

代码片段：

intret;ret=OSATaskCreate(sample_led_status_task_ref,sample_led_status_task_stack,SAMPLE_LED_STATUS_TASK_STACK_SIZE,120,"sample_gpio_task_gpio",sample_gpio_task_gpio,NULL);ASSERT(ret==OS_SUCCESS);sample_led_status_uart_printf("Phase2Inits_exit\n");

sample_gpio_task_gpio

主任务，间隔10s更改led状态。

代码片段：

//每一种形态显示10slib_led_status=NORMAL;sample_led_status_uart_printf("%s[%d]NORMAL",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=NOGPRS;sample_led_status_uart_printf("%s[%d]NOGPRS",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=NOSERVER;sample_led_status_uart_printf("%s[%d]NOSERVER",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=UNREGISTERED;sample_led_status_uart_printf("%s[%d]UNREGISTERED",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=UPGRADE;sample_led_status_uart_printf("%s[%d]UPGRADE",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=NOTLIVE;sample_led_status_uart_printf("%s[%d]NOTLIVE",__FUNCTION__,__LINE__);sample_led_status_sleep(10);lib_led_status=FACTORY;sample_led_status_uart_printf("%s[%d]FACTORY",__FUNCTION__,__LINE__);sample_led_status_sleep(10);

在SDK根目录打开命令行，输入命令.\\amaziot_bloom_os_sdk\sample\libraries\8.1_led_status\

PSF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRFλ.\\amaziot_bloom_os_sdk\sample\libraries\8.1_led_status\子目录或文件out\bin已经存在。命令语法不正确。子目录或文件build\obj已经存在。gnumake:Enteringdirectory`F:/3.asr-b//1.software/BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF/amaziot_bloom_os_sdk/sample/libraries/8.1_led_status'_unaligned_access-g-O2--apcs/inter--diag_suppress2084,1,2,177,188,223,550,1296,2795,6319,9931,9933--diag_error=warning--gnu--thumb--loose_implicit_cast-DDATA_COLLECTOR_IMPL-DISPT_OVER_SSP-DDIAG_SSP_DOUBLE_BUFFER_USE_DYNAMIC_ALLOCATION-DENV_XSCALE-DL1_DCXO_ENABLED-DLTE_HIGH_MOBILITY_OPTIMIZATION-DRUN_XIP_MODE-DCRANE_Z2-DCA_LONG_IPC_MSG-DNEZHA3-DNEZHA3_1826-DUPGRADE_PLMS-DUPGRADE_PLMS_SR-DLTE_GSMMULTIBCCH-DGPLC_LTE_RSSI_SCAN-DL1V_NEW_RSSI-DUPGRADE_PLMS_3G-DUPGRADE_PLMS_L1-DUPGRADE_FG_PLMS-DFG_PLMS_URR-DUPGRADE_L1A_FG_PLMS-DUPGRADE_PLMS_STAGE_2-DUPGRADE_MBCCH-DMULTI_BCCH_READY_IND-DURR_MRAT_ICS_SEARCH-DUPGRADE_ICS-DMRAT_NAS-DUPGRADE_PLMS_SEARCH_API-DICS_MBCCH-DICS_MBCCH_2G_RSSI-DDIAG_NEWPP-DPHS_SW_DEMO-DPHS_SW_DEMO_TTC-DPHS_SW_DEMO_TTC_PM-DFULL_SYSTEM-D_DDR_INIT_-D_TAVOR_HARBELL_-DUPGRADE_ARBEL_PLATFORM-D_TAVOR_B0_SILICON_-DTDL1C_SPY_ENABLE-DDLM_TAVOR-DTAVOR-DFLAVOR_DUALCORE-DDEBUG_D2_MOR_REG_RESEREVED_ENABLE-D_DIAG_USE_COMMSTACK_-D_TAVOR_DIAG_-DPM_DEBUG_MODE_ENABLED-DPM_D2FULL_MODE-DPM_EXT_DBG_INT_ARR-DFEATURE_WB_AMR_PS-DMACRO_FOR_LWG-DHL_LWG-DOPTIMIZE_FOR_2G_BCCH-DPLAT_TEST-D_FDI_USE_OSA_-DPLAT_USE_THREADX-DLWIP_IPNETBUF_SUPPORT-DCRANE_MCU_DONGLE-DAT_OVER_UART-DPHS_SW_DEMO_TTC_PM-DUPGRADE_LTE_ONLY-DEXT_AT_MODEM_SUPPORT-DLTEONLY_THIN_SINGLE_SIM-DLFS_FILE_SYS-DLFS_FILE_SYS_V2-DPSM_ENABLE-DNO_PAHO_MQTT-DNO_XML-DNO_LWM2M-DREMOVE_MBEDTLS-DNO_AT_NET-DCRANE_SD_NOT_SUPPORT-DNTP-DYMODEM_EEH_DUMP-DENABLE_DM_LTEONLY-DLTEONLY_THIN-DNO_EXTEND_MY_Q_AT-DNOT_SUPPORT_HTTPS-DNOT_SUPPORT_PM813-DCRANEL_4MRAM-DREMOVE_PB-DUART_NEW_VERSION-DREMOVE_MEP-DREMOVE_SMS-DREMOVE_ENVSIM-DAPN_INCODE-DLTEONLY_THIN_SINGLE_SIM_2MFLASH-DASR160X_OPENCPU_FEATURE-DENABLE_UART3_FEATRUE-DENABLE_UART4_FEATRUE-DYUGE_MBEDTLS_3_2_1-DENABLE_MAC_TX_DATA_LOGGING-DDISABLE_NVRAM_ACCESS-DINTEL_UPGRADE_EE_HANDLER_SUPPORT-DLTE_W_PS-DL1_DUAL_MODE-DUPGRADE_HERMON_DUAL-DINTEL_UPGRADE_DUAL_RAT-DINTEL_UPGRADE_GPRS_CIPHER_FLUSH-DUPGRADE_ENHANCED_QUAD_BAND-DINTEL_2CHIP_PLAT-DI_2CHIP_PLAT-DUPGRDE_TAVOR_COMMUNICATION-DRUN_WIRELESS_MODEM-DFLAVOR_DDR12MB_GB1MB5-DFEATURE_SHMEM-DACIPC_ENABLE_NEW_CALLBACK_MECHANISM-DRELIABLE_DATA-DMAP_NSS-DTV_FNAME="\"SW_PLATFORM=PMD2NONEPHS_SW_DEMOPHS_SW_DEMO_PMSRCNUCLEUSFULL_SYSTEMNOACRTCPDFLTPLAT_TESTPV2DIAGOSHMEMNVMWITHL1V\""-DTV_FDESC="\"SW_DESCRIPTION=\""-DENABLE_ACIPC-D_DATAOMSL_ENABLED_-DUSB_CABLE_DETECTION_VIA_PMIC-DMIPS_TEST-DMIPS_TEST_RAM-DFLAVOR_DIET_RAM-DNVM_INCLUDE-DMSL_INCLUDE-DMSL_POOL_MEM-DNO_AUDIO-DOSA_QUEUE_NAMES-D_DIAG_DISABLE_USB_-DOSA_NUCLEUS-DOSA_USED-DPM_D2NONE_MODE-DCRANE_SOC_TEMPERATURE_SENSOR-DL1_SW_UPDATE_FOR_DIGRF-DPHS_L1_SW_UPDATE_R7-DUPGRADE_LTE-DFRBD_CALIB_NVM-DFRBD_AGC_CALIB-DFRBD_FDT_CALIB-DHSPA_MPR-DCAPT_PARAMS_OPTIMIZE-DL1_WB_R99_ONLY-DL1V_WB_R99_ONLY-DINTERGRATED_RF_SUPPORT-DL1_RX_DIV_SUPPORT-DENABLE_OOS_HANDLING-DTAVOR_D2_WB_L1_SUPPORT-DL1_DDR_HIGH_FREQ-DUPGRADE_DIGRF3G_SUPPORT-DW_PS_PLUS_G_PAGING-D"NO_APLP=0"-DINTEL_UPGRADE_UNIFIED_VOICE_TASK-DINTEL_UPGRADE_R99-DAPLP_SPY_ENABLE-D__TARGET_FEATURE_DOUBLEWORD-DWHOLE_UMTS_STACK-DUSE_TTPCOM_CSR_BLUETOOTH_AUDIO_GAIN_CONTROL-DL1_UPGRADE_R5-DUPGRADE_EDGE-DUPGRADE_R4_FS1-DINTEL_UPGRADE_GSM_CRL_IF-DUPGRADE_EGPRS_M-DINTEL_UPGRADE_EGPRS_M-DINTEL_UPGRADE_RF_PARAMS_IN_CF_TDS-DINTEL_UPGRADE_2SAMPLES_PER_SYMBOL-D"GPRS_MULTISLOT_CLASS=12"-D"EGPRS_MULTISLOT_CLASS=12"-DMARVELL_UPGRADE_BSIC_REDESIGN-DMSL_INCLUDE-DINTEL_HERMON_SAC-DCRANE_CUST_BUILD-DL1_SW_UPDATE_FOR_DIGRF-DFLAVOR_COM-DSILICON_PV2-DSILICON_SEAGULL-DSILICON_TTC_CORE_SEAGULL-DPCAC_INCLUDE-Otime-DBUILD_DATE="\"07262024\""-DBUILD_TIME="\"10:39:35\""-Iatcmds\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\hop\telephony\yuge\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\hal\UART\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\hal\core\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\hal\PMU\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\hal\GPIO\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\os\posix\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\diag\diag_logic\src-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\csw\SysCfg\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\csw\platform\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\env\win32\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\csw\BSP\inc-IF:\3.asr-b\\1.software\BlOOM_OS_1606_OPENCPU_1191_A09_WIHT_NEWRF\include\asr160x\csw\platform\dev_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参考入门中开发工具，生成工具。

测试步骤：

参考编译教程，和文档开头的编译指令，进行编译

按照编译教程选择对应的选项

烧录

上电后，debug串口会打印出计算出的数据；

无

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