資源簡(jiǎn)介
本資源為STM32F407-四路超聲波測(cè)距代碼，測(cè)試絕對(duì)可用
我所使用的測(cè)距模塊是HC-SR04，HC-SR04超聲波測(cè)距模塊可提供2cm-400cm的非接觸式距離感測(cè)功能，測(cè)
距精度可達(dá)高到3mm；
HC-SR04基本工作原理：
(1)采用IO口TRIG觸發(fā)測(cè)距，給最少10us的高電平信呈。
(2)模塊自動(dòng)發(fā)送8個(gè)40khz的方波，自動(dòng)檢測(cè)是否有信號(hào)返回；
(3)有信號(hào)返回， 通過(guò)IO口ECHO輸出一個(gè)高電平， 高電平持續(xù)的時(shí)間就是超聲波從發(fā)射到返回的時(shí)間。 測(cè)試距離=(高電平時(shí)間*聲速(340M/S))/2。
程序編寫(xiě)思路是：1、配置好使用到的GPIO以及定時(shí)器；
2、給模塊TRIG端口發(fā)送大于10us的高電平信號(hào)，當(dāng)收、收到ECHO回響信號(hào)是，打開(kāi)定時(shí)器開(kāi)始定時(shí)；
3、當(dāng)回響信號(hào)消失，關(guān)閉定時(shí)器；
4、通過(guò)定時(shí)器定時(shí)時(shí)間來(lái)確定距離。
代碼片段和文件信息
/**
??******************************************************************************
??*?@file????misc.c
??*?@author??MCD?Application?Team
??*?@version?V1.4.0
??*?@date????04-August-2014
??*?@brief???This?file?provides?all?the?miscellaneous?firmware?functions?（add-on
??*??????????to?CMSIS?functions）.
??*??????????
??*??@verbatim???
??*???????????????????????????????
??*??????????===================================================================??????
??*????????????????????????How?to?configure?Interrupts?using?driver?
??*??????????===================================================================??????
??*?
??*????????????This?section?provide?functions?allowing?to?configure?the?NVIC?interrupts?（IRQ）.
??*????????????The?Cortex-M4?exceptions?are?managed?by?CMSIS?functions.
??*
??*????????????1.?Configure?the?NVIC?Priority?Grouping?using?NVIC_PriorityGroupConfig（）
??*????????????????function?according?to?the?following?table.
?
??*??The?table?below?gives?the?allowed?values?of?the?pre-emption?priority?and?subpriority?according
??*??to?the?Priority?Grouping?configuration?performed?by?NVIC_PriorityGroupConfig?function
??*????==========================================================================================================================
??*??????NVIC_PriorityGroup???|?NVIC_IRQChannelPreemptionPriority?|?NVIC_IRQChannelSubPriority??|???????Description
??*????==========================================================================================================================
??*?????NVIC_PriorityGroup_0??|????????????????0??????????????????|????????????0-15?????????????|?0?bits?for?pre-emption?priority
??*???????????????????????????|???????????????????????????????????|?????????????????????????????|?4?bits?for?subpriority
??*????--------------------------------------------------------------------------------------------------------------------------
??*?????NVIC_PriorityGroup_1??|????????????????0-1????????????????|????????????0-7??????????????|?1?bits?for?pre-emption?priority
??*???????????????????????????|???????????????????????????????????|?????????????????????????????|?3?bits?for?subpriority
??*????--------------------------------------------------------------------------------------------------------------------------????
??*?????NVIC_PriorityGroup_2??|????????????????0-3????????????????|????????????0-3??????????????|?2?bits?for?pre-emption?priority
??*???????????????????????????|???????????????????????????????????|?????????????????????????????|?2?bits?for?subpriority
??*????--------------------------------------------------------------------------------------------------------------------------????
??*?????NVIC_PriorityGroup_3??|????????????????0-7????????????????|????????????0-1??????????????|?3?bits?for?pre-emption?priority
??*???????????????????????????|???????????????????????????????????|?????????????????????????????|?1?bits?for?subpriority
??*????----------------------------------------------- ?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????目錄???????????0??2017-07-25?02:07??STM32F407-四路超聲波測(cè)距\
?????目錄???????????0??2017-10-04?14:20??STM32F407-四路超聲波測(cè)距\CORE\
?????文件??????109142??2014-07-17?21:52??STM32F407-四路超聲波測(cè)距\CORE\core_cm4.h
?????文件???????22735??2014-07-17?21:52??STM32F407-四路超聲波測(cè)距\CORE\core_cm4_simd.h
?????文件???????17146??2014-07-17?21:52??STM32F407-四路超聲波測(cè)距\CORE\core_cmFunc.h
?????文件???????20513??2014-07-17?21:52??STM32F407-四路超聲波測(cè)距\CORE\core_cmInstr.h
?????文件???????29605??2014-08-02?00:12??STM32F407-四路超聲波測(cè)距\CORE\startup_stm32f40_41xxx.s
?????目錄???????????0??2017-07-25?02:07??STM32F407-四路超聲波測(cè)距\FWLIB\
?????目錄???????????0??2017-07-25?02:07??STM32F407-四路超聲波測(cè)距\FWLIB\inc\
?????文件????????6924??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\misc.h
?????文件???????32880??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_adc.h
?????文件???????27318??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_can.h
?????文件????????2416??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_crc.h
?????文件???????14481??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_cryp.h
?????文件???????14946??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_dac.h
?????文件????????4296??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_dbgmcu.h
?????文件???????12977??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_dcmi.h
?????文件???????28882??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_dma.h
?????文件???????19692??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_dma2d.h
?????文件????????8012??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_exti.h
?????文件???????24467??2014-08-04?22:05??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_flash.h
?????文件????????3275??2014-08-04?22:05??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_flash_ramfunc.h
?????文件???????44924??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_fmc.h
?????文件???????27181??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_fsmc.h
?????文件???????23548??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_gpio.h
?????文件???????10084??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_hash.h
?????文件???????31939??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_i2c.h
?????文件????????4323??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_iwdg.h
?????文件???????21191??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_ltdc.h
?????文件????????7728??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_pwr.h
?????文件???????30063??2014-08-01?23:18??STM32F407-四路超聲波測(cè)距\FWLIB\inc\stm32f4xx_rcc.h
............此處省略144個(gè)文件信息
評(píng)論
共有 條評(píng)論
川公網(wǎng)安備 51152502000135號(hào)