Grove IoT スターターキット for SORACOM で GPS を使う

GPS の Grove を UART に接続します。

gps_test/gps_test.ino

// ---------------------------------------------------------------
/*
    gps_test.ino


                    Aug/06/2021
*/
// ---------------------------------------------------------------
#include <WioLTEforArduino.h>
#define INTERVAL    (500)

WioLTE Wio;

// ---------------------------------------------------------------
void setup()
{
    delay(200);

    SerialUSB.println("");
    SerialUSB.println("*** START ***");

    SerialUSB.println("### I/O Initialize.");
    GpsBegin(&SerialUART);
    Wio.Init();

    SerialUSB.println("### Power supply ON.");
    Wio.PowerSupplyGrove(true);
    delay(500);
    SerialUSB.println("*** Setup *** ddd");
    delay(500); 
    SerialUSB.println("*** Setup *** eee");
    delay(500);
    SerialUSB.println("*** Setup *** fff");
    delay(500);
    SerialUSB.println("*** Setup completed ***");
}

// ---------------------------------------------------------------
void loop()
{
    const char* data = GpsRead();

    if (data != NULL)
        {
        if (strncmp(data, "$GPGGA,", 7) == 0) {
            SerialUSB.println(data);
            }
        else if (strncmp(data, "$GPGSA,", 7) == 0) {
            SerialUSB.println(data);
            }
        else if (strncmp(data, "$GPGSV,", 7) == 0) {
            SerialUSB.println(data);
            }
        else if (strncmp(data, "$GPRMC,", 7) == 0) {
            SerialUSB.println(data);
            }
        else
            {
            SerialUSB.print("   : ");
            SerialUSB.println(data);
            }
        }
    else
        {
//      SerialUSB.println("*** error GpsRead ***");
        }


    Wio.LedSetRGB(0, 0, 1); 
    delay(INTERVAL / 2);
    Wio.LedSetRGB(0, 0, 0); 
    delay(INTERVAL / 2);
}

// ---------------------------------------------------------------

#define GPS_OVERFLOW_STRING "OVERFLOW"

HardwareSerial* GpsSerial;
// char GpsData[100];
char GpsData[256];
char GpsDataLength;

// ---------------------------------------------------------------
void GpsBegin(HardwareSerial* serial)
{
    GpsSerial = serial;
    GpsSerial->begin(9600);
    GpsDataLength = 0;
}

// ---------------------------------------------------------------
const char* GpsRead()
{
    while (GpsSerial->available()) {
        char data = GpsSerial->read();
        if (data == '\r') continue;
        if (data == '\n') {
            GpsData[GpsDataLength] = '\0';
            GpsDataLength = 0;
            return GpsData;
        }

        if (GpsDataLength > sizeof (GpsData) - 1) { // Overflow
            GpsDataLength = 0;
            return GPS_OVERFLOW_STRING;
        }
        GpsData[GpsDataLength++] = data;
    }

    return NULL;
}

// ---------------------------------------------------------------

テスト時の結線