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"""#TPYBoard v102 驅(qū)動(dòng)串口攝像頭PTC06 拍照并保存到TF卡#------------------------------------------------------#作者:山東蘿卜電子科技有限公司#時(shí)間:2018年03月15日"""import pybfrom pyb import UART,Switch"""拍照的基本流程--------------------1.清空?qǐng)D片緩存2.發(fā)送拍照命令3.獲取圖片的長度4.根據(jù)長度讀取圖片數(shù)據(jù)使用到的指令與返回的數(shù)據(jù)格式-------------------------------復(fù)位0x56 0x00 0x26 0x00返回0x76 0x00 0x26 0x00 +DSP 版本信息+Init end------------------------清空?qǐng)D片緩存 0x56 0x00 0x36 0x01 0x02返回0x76 0x00 0x36 0x00 0x00-------------------------拍照命令0x56 0x00 0x36 0x01 0x00返回0x76 0x00 0x36 0x00 0x00--------------------------讀所拍圖片的長度56 00 34 01 00返回0x76 0x00 0x34 0x00 0x04 0x00 0x00 XX YY(XX 為高位字節(jié)，YY 為低位字節(jié))--------------------------讀取圖片數(shù)據(jù)0x56 0x00 0x32 0x0C 0x00 0x0A 0x00 0x00 AA BB 0x00 0x00 XX YY 0x00 0xFFAA BB:起始地址(先高位字節(jié),后低位字節(jié).必須是8的倍數(shù))XX YY:本次讀的數(shù)據(jù)長度(先高位字節(jié),后低位字節(jié))返回76 00 32 00 00 FF D8 ....... FF D9 76 00 32 00 00(完整的JPEG 圖片文件是以 FF D8 開始 FF D9 結(jié)尾)"""#-----Command---------#initcmd=b'\x56\x00\x26\x00' #復(fù)位指令clearcmd=b'\x56\x00\x36\x01\x02' #清除緩存photocmd=b'\x56\x00\x36\x01\x00' #拍照lengthcmd=b'\x56\x00\x34\x01\x00' #獲取圖片長度readcmd=b'\x56\x00\x32\x0C\x00\x0A\x00\x00' #獲取圖片數(shù)據(jù)responseCmd=b'\x76\x00\x32\x00\x00'#返回的圖片數(shù)據(jù)固定頭和尾#---------------------------------#isFlag=0#標(biāo)識(shí)是否初始化isPhoto=0#標(biāo)識(shí)是否發(fā)送拍照命令num=1f_name='/sd/photo%s.jpeg'#保存的文件名稱nBytes=512#每次讀取的字節(jié)數(shù)#---------------------------------#uart=UART(4,115200,timeout=100)#串口4 TX-X1 RX-X2#------將10進(jìn)制轉(zhuǎn)為16進(jìn)制字節(jié)數(shù)組--------#def convert_Data(num):    if num>255:        num_h=hex(num)        if len(num_h)<6:            num_h_a=num_h[:3]            num_h_b='0x'+num_h[3:]        else:            num_h_a=num_h[:4]            num_h_b='0x'+num_h[4:]        byte_num=bytes([int(num_h_a,16),int(num_h_b,16)])    else:        byte_num=b'\x00'+bytes([num])    return byte_num#---------------------------------#函數(shù)名:get_photo#描述:獲取圖片數(shù)據(jù)#參數(shù):起始地址、讀取長度#返回:成功返回正常數(shù)據(jù)，失敗返回0#---------------------------------/def get_photo(add,readlen):    global readcmd,responseCmd        cmd=readcmd+add+b'\x00\x00'+readlen+b'\x00\xFF'    uart.write(cmd)    while uart.any()<=0:        continue    data=uart.read()    #print('data:',data)    #print('data[0:5]:',data[0:5])    #print('data[-5:]:',data[-5:])    if data[0:5]==responseCmd and data[-5:]==responseCmd:        revdata=data[5:-5]        print('revdata:',revdata)    else:        revdata=0    return revdata#---------------------------------#函數(shù)名:test#描述:USR按鍵的回調(diào)函數(shù)。#按鍵每按1次拍照1次#---------------------------------/def test():    global num,isPhoto    pyb.delay(30)    if(sw()):        sw.callback(None)#正在獲取數(shù)據(jù)時(shí) 禁用回調(diào)        isPhoto=0        num+=1        pyb.LED(3).on()        #清除緩存        uart.write(clearcmd)#等待模塊上電完畢       print('wait......')pyb.delay(2800)print('init start.......')uart.write(initcmd)sw=Switch()sw.callback(test)while True:    if uart.any()>0:        data=uart.read()        print('revdata:',data)        if isFlag==0:            #說明接收的是復(fù)位后的信息            if data==b'Init end\r\n':                #復(fù)位完畢                print('init ok.......')                pyb.delay(2000)                isFlag=1                pyb.LED(2).on()        else:            if len(data)>=5:                if data[0]==118:#0x76                    if data[2]==54:#0x36                        if isPhoto==0:                            #清除緩存返回                            print('-----clear buffer ok----')                            isPhoto=1                            uart.write(photocmd)                        else:                            #拍照返回                            print('-----taking pictures ok----')                            uart.write(lengthcmd)                    if data[2]==52:#0x34                        print('photo length:',data[7],'-',data[8])                        tlen=data[7]*256+data[8]                        t_c=tlen//nBytes                        t_y=tlen%nBytes                        add=0                        #256=[0x01,0x00] 512=[0x02,0x00]                        length=convert_Data(nBytes)                        name=f_name % str(num)                        print('filename:',name)                        for i in range(0,t_c):                            add=convert_Data(i*nBytes)                            #每512字節(jié)寫一次                            revdata=get_photo(add,length)                            if revdata!=0:                                f=open(name,'a')                                f.write(revdata)                                f.close()                            pyb.LED(4).toggle()                            print('-------------',i)                            pyb.delay(100)                        add=convert_Data(t_c*nBytes)                            revdata=get_photo(add,convert_Data(t_y))                        if revdata!=0:                            f=open(name,'a')                            f.write(revdata)                            f.close()                        pyb.LED(3).off()                        pyb.LED(4).off()                        pyb.delay(100)                        print('*========================================*')                        sw.callback(test)            else:                print('-----data length error-----')