ov2640jpg格式输出最一帧数据可能有多大,全像素jpg格式会不会一帧超过300kB
使用PWM模块连恒流驱动电源控制LED时,发现并不能调节LED亮度,请问是我使用的这个恒流驱动电源的问题还是PWM不能连恒流驱动电源来调节LED亮度呢?
route: SIOCADDRT: Network is unreachable原因
方式一:xdata 定义语句:unsigned char xdata *str="{\"success\":\"1\"\"result\":{\"timestamp\":\"1645579191\"\"datetime_1\":\"2032-02-23 09:19:51\"aa";使用: while(*str!=0) { str++; i++; if (i==66) year1=*str; if (i==67) year2=*str; if (i==69) month1=*str; if (i==70) month2=*str; if (i==72) day1=*str; if (i==73) day2=*str; if (i==75) hour1=*str; if (i==76) hour2=*str; if (i==78) minute1=*str; if (i==79) minute2=*str; if (i==81) sec1=*str; if (i==82) sec2=*str; }得到的内容,在LCD1602上无法显示。方式二:xdata定义:unsigned char xdata str[120]="{\"success\":\"1\"\"result\":{\"timestamp\":\"1645579191\"\"datetime_1\":\"2032-02-23 09:19:51\"aa";使用:year1=str[66];year2=str[67];month1=str[69];month2=str[70];day1=str[72];day2=str[73];hour1=str[75];hour2=str[76];minute1=str[78];minute2=str[79];sec1=str[81];sec2=str[82];在LCD1602上还是不可以显示! LcdInit(); LcdWriteData(year1); LcdWriteData(year2); LcdWriteData('-'); LcdWriteData(month1); LcdWriteData(month2); LcdWriteData('-'); LcdWriteData(day1); LcdWriteData(day2); LcdWriteCom(0x40+0x80); LcdWriteData(hour1); LcdWriteData(hour2); LcdWriteData(':'); LcdWriteData(minute1); LcdWriteData(minute2); LcdWriteData(':'); LcdWriteData(sec1); LcdWriteData(sec2);重金求解!!!!!!!!!!***********重金求解******************