我使用了以下軟件包：從串口讀取 ( go get go.bug.st/serial)解析來自串口的傳入消息 ( go get adrianmo/go-nmea)主機(jī)：Windows 10轉(zhuǎn)到版本：轉(zhuǎn)到版本 go1.14.4 windows/amd64根據(jù)文檔，我編寫了一個(gè)簡單的代碼，打開專用串行端口（COM4）并從端口讀取 NMEA 數(shù)據(jù)并嘗試根據(jù)go-nmea包解析數(shù)據(jù)數(shù)據(jù)來自 GPS 傳感器的傳入數(shù)據(jù)：$GPRMC,135533.000,A,5306.6644,N,00851.3177,E,0.11,214.59,300620,,,A*6E$GPRMC,135534.000,A,5306.6643,N,00851.3177,E,0.06,187.72,300620,,,A*68$GPRMC,135535.000,A,5306.6643,N,00851.3177,E,0.22,341.68,300620,,,A*6C$GPRMC,135536.000,A,5306.6644,N,00851.3176,E,0.20,324.35,300620,,,A*60$GPRMC,135537.000,A,5306.6645,N,00851.3176,E,0.12,348.37,300620,,,A*69代碼片段package mainimport ( "fmt" "log" "github.com/adrianmo/go-nmea" "go.bug.st/serial" } }}問題如果我運(yùn)行代碼，我會(huì)收到以下錯(cuò)誤：2020/06/30 16:02:16 nmea: sentence does not start with a '$' or '!'exit status 1這很奇怪，因?yàn)槿绻易⑨尩舸a解析代碼： // s, err := nmea.Parse(rawSentence) // if err != nil { // log.Fatal(err) // } // if s.DataType() == nmea.TypeRMC { // m := s.(nmea.RMC) // fmt.Printf("Raw sentence: %v\n", m) // fmt.Printf("Time: %s\n", m.Time) // fmt.Printf("Validity: %s\n", m.Validity) // fmt.Printf("Latitude GPS: %s\n", nmea.FormatGPS(m.Latitude)) // fmt.Printf("Latitude DMS: %s\n", nmea.FormatDMS(m.Latitude)) // fmt.Printf("Longitude GPS: %s\n", nmea.FormatGPS(m.Longitude)) // fmt.Printf("Longitude DMS: %s\n", nmea.FormatDMS(m.Longitude)) // fmt.Printf("Speed: %f\n", m.Speed) // fmt.Printf("Course: %f\n", m.Course) // fmt.Printf("Date: %s\n", m.Date) // fmt.Printf("Variation: %f\n", m.Variation) // }如上所述，串口打印 GPS 坐標(biāo)。我在哪里錯(cuò)了？我嘗試通過在代碼中執(zhí)行以下操作來刪除換行符和回車符： rawSentence := string(buff[:n]) rawSentence = string.ReplaceAll(rawSentence, "\r\n", "") fmt.Print(rawSentence)但我仍然得到同樣的錯(cuò)誤。
1 回答
慕婉清6462132
TA貢獻(xiàn)1804條經(jīng)驗(yàn) 獲得超2個(gè)贊
我能夠找出問題所在。我首先檢查我的字節(jié)是如何從以下代碼中讀取的：
n, err := serPort.Read(buff)
fmt.Printf("%d", n)
它依次給出值1和73, 74。假設(shè)1是設(shè)備本身發(fā)送的換行符，我發(fā)現(xiàn)這可能是代碼無法捕獲的原因$GPRMC。
因此我修改了我的代碼以檢查讀取的字節(jié)數(shù)是否總是大于 1 字節(jié)
for {
n, err := serPort.Read(buff)
fmt.Printf("%v\n", n)
if err != nil {
log.Fatal(err)
break
}
// do not try to parse a single read byte
// instead parse the actual incoming string.
if n > 1 {
rawSentence := string(buff[:n])
fmt.Print(rawSentence)
s, err := nmea.Parse(rawSentence)
if err != nil {
log.Fatal(err)
}
if s.DataType() == nmea.TypeRMC {
m := s.(nmea.RMC)
fmt.Printf("Raw sentence: %v\n", m)
fmt.Printf("Time: %s\n", m.Time)
fmt.Printf("Validity: %s\n", m.Validity)
fmt.Printf("Latitude GPS: %s\n", nmea.FormatGPS(m.Latitude))
fmt.Printf("Latitude DMS: %s\n", nmea.FormatDMS(m.Latitude))
fmt.Printf("Longitude GPS: %s\n", nmea.FormatGPS(m.Longitude))
fmt.Printf("Longitude DMS: %s\n", nmea.FormatDMS(m.Longitude))
fmt.Printf("Speed: %f\n", m.Speed)
fmt.Printf("Course: %f\n", m.Course)
fmt.Printf("Date: %s\n", m.Date)
fmt.Printf("Variation: %f\n", m.Variation)
}
}
}
果然，代碼現(xiàn)在可以工作了，得到的輸出是我所期望的：
$GPRMC,142312.000,A,5306.6774,N,00851.3114,E,0.04,14.48,300620,,,A*5A
Raw sentence: $GPRMC,142312.000,A,5306.6774,N,00851.3114,E,0.04,14.48,300620,,,A*5A
Time: 14:23:12.0000
Validity: A
Latitude GPS: 5306.6774
Latitude DMS: 53° 6' 40.644000"
Longitude GPS: 851.3114
Longitude DMS: 8° 51' 18.684000"
Speed: 0.040000
Course: 14.480000
Date: 30/06/20
Variation: 0.000000
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