說明前面講到用通訊解析框架一般mcu或者其他的嵌入式系統或多或少涉及到通訊不光有各種各樣的字節指令還有字符串指令比如本文要講的AT指令很多模塊都涉及使用at指令作為指令集去做命令比如電話模塊wifi模塊藍牙模塊等等一般at指令解析比較繁瑣如果用到統一的框架做解析呢

注通訊解析框架的介紹可以看之前我寫的文章內容這里不再贅述

下面我們著重講解使用通訊解析框架解析at指令

以漢楓wifi模塊為例

h框架文件

typedefstruct

U8Readbuf讀內容

U16BufLen讀內容長度

U8isUp主動上傳還是下載

intYALWifiCmdPos其他命令位置

YALWifiCmdPM讀數據地址

typedefstruct

constcharBufat內容

U8HandleYALWifiCmdPMbuf長度

U16GetID獲取的CMDId

YALWifiCMDHandle讀數據框架結構

enum

YALWIFICMDGETENTERAT1進入AT

YALWIFICMDGETANAENTERAT應答進入AT

YALWIFICMDSETCLOSESHOWAT關閉回顯

C內容文件

U8GetYALWIFIEnterAtYALWifiCmdPMCmdPm

U8GetYALWIFIAckEnterAtYALWifiCmdPMCmdPm

U8GetYALWIFICloseShowAtYALWifiCmdPMCmdPm

U8YALWIFILINKENDr結尾

獲取指令

constU8YALWIFIREQAT

constYALYALWifiCMDHandleYALWIFICmdhandle

GetYALWIFIEnterAtYALWIFICMDGETENTERAT進入AT

aGetYALWIFIAckEnterAtYALWIFICMDGETANAENTERAT應答AT

EGetYALWIFICloseShowAtYALWIFICMDSETCLOSESHOWAT關閉回顯

intYALWifiCMDfindCmdPosU16Cmd

inti

U8CmdCtsizeofYALWIFICmdhandlesizeofYALWIFICmdhandle0

fori0iisGet

returnYALWIFIReadCMDCmdPmYALWifiCmdPos

else

ifStrcmpCmdPmReadbufU8a1

err0

returnerr

函數名稱GetYALWIFIMacID

描述獲取WiFi版本號和MACID

輸入形參

返回值無

U8GetYALWIFIAckEnterAtYALWifiCmdPMCmdPm

u8err1

ifCmdPmisGet

returnYALWIFIReadCMDCmdPmYALWifiCmdPos

else

ifYALWifiCmdisOkCmdPmReadbuf

SetAtMode1

err0

returnerr

函數名稱GetYALWIFICloseShowAt

描述關閉回顯

輸入形參

返回值無

U8GetYALWIFICloseShowAtYALWifiCmdPMCmdPm

u8err1

ifCmdPmisGet

U8infostr10

轉義字符處理

memsetinfostr0sizeofinfostr

sprintfscharinfostrsizeofinfostroffsYALWIFILINKEND

strcatcharinfostrcharYALWIFILINKEND

returnYALWIFIReadWriteCMDCmdPmYALWifiCmdPosinfostr

else

ifYALWifiCmdisOkCmdPmReadbuf

err0

returnerr

函數名稱YALWIFIReadCMD

描述讀WiFi指令

輸入形參YALWifiCmdPos列表位置

返回值0成功1失敗

u8YALWIFIReadCMDintYALWifiCmdPos

ifCheckCmdPosYALWifiCmdPosreturn0

memcpySENDBUFYALWIFICmdhandleYALWifiCmdPosBufstrlencharYALWIFICmdhandleYALWifiCmdPosBuf

USART1SendStringSENDBUFstrlencharSENDBUF

return0

intYALWifiCMDfindCmdPosU16Cmd

inti

U8CmdCtsizeofYALWIFICmdhandlesizeofYALWIFICmdhandle0

fori0iCmdCti

ifCmdYALWIFICmdhandleiGetIDreturni

return1

解析at指令將字符串數據內容解析到該函數中

U8YALAnaDatarevcmdU8BufU16BufLen

intYALWifiCmdPos

YALWifiCmdPMcmdPm

YALWifiCmdPosYALWifiCMDfindCmdPosGetLastCmdId上一次請求的內容

ifCheckCmdPosYALWifiCmdPosreturn1

cmdPmReadbufBuf

cmdPmBufLenBufLen

cmdPmYALWifiCmdPosYALWifiCmdPos

cmdPmisGet0

returnYALWIFICmdhandleYALWifiCmdPosHandlecmdPm回調函數

發送cmd消息通過CMDId請求對應的at指令

voidYALWifiCMDSetCmdU16Cmd

intWifiCmdPos

YALWifiCmdPMcmdPm

cmdPmReadbufSendBuf

cmdPmBufLen0

cmdPmisGet1

WifiCmdPosWifiCMDfindCmdPosCmd

ifWifiCmdPos1return

ifCheckCmdPosWifiCmdPosreturn

cmdPmWifiCmdPosWifiCmdPos

YALWIFICmdhandleWifiCmdPosHandlecmdPm

SetLastCmdIdYALWIFICmdhandleWifiCmdPosGetID

總結通過框架將AT指令的頭尾等公共部分作為框架一部分可變的內容部分作為識別的內容實體用于解析和發送比如作為識別碼ATE中的E作為識別碼

識別解析的內容通過各種的handle回調處理當發送一條AT指令對應的回一條AT指令解析和發送對應LastCmdId的關系去解對應的回應的AT指令內容當然AT指令多變本文只是

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