ADH8066 (Sparkfun) GSM モジュールを Arduino Uno に接続し、Arduino と GSM モジュールの間で正しいシリアルを取得しようとしています。直接接続すると（USBまたはTTLラインのみで）正常に動作しますが、Arduino経由で制御すると動作しません。一部のテキストは正しく出力され、残りはボーレートが間違っているかのように文字化けしますが、PC から接続するときと同じボー (115200) を使用しているだけです。
私が使用しているArduinoコードは次のとおりです。
#include <SoftwareSerial.h>
#define rxPin 7
#define txPin 8
SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);
// EN: String buffer for the GPRS shield message
String SmsStorePos = String("");
String msg = String("");
String snTmp = String("");
String snFull = String("");
// EN: Set to 1 when the next GPRS shield message will contains the SMS message
int SmsContentFlag = 0;
// EN: Pin of the LED to turn ON and OFF depending on the received message
int ledPin = 5;
int powerPin = 6;
void setup()
{
mySerial.begin(115200); // the GPRS baud rate
mySerial.print("\r");
delay(1000);
Serial.begin(115200); // the Arduino IDE serial
Serial.println("Started!");
pinMode( ledPin, OUTPUT );
digitalWrite( ledPin, LOW );
pinMode( powerPin, OUTPUT);
digitalWrite(powerPin, LOW); // brings ONKEY low to turn on the modem (aka pressing the ONKEY)
delay(3000);
digitalWrite(powerPin, HIGH); // sets the pin HIGH again (restore 5V)
delay(5000);
// test LED pin
digitalWrite ( ledPin, HIGH);
delay(1000);
digitalWrite( ledPin, LOW);
}
void loop()
{
char SerialInByte;
// Send anything we receive from the IDE to the modem
if(Serial.available())
{
mySerial.print((unsigned char)Serial.read());
}
else if(mySerial.available())
{
char SerialInByte;
SerialInByte = (unsigned char)mySerial.read();
//SerialInByte = mySerial.read();
// EN: Relay to Arduino IDE Monitor
Serial.print( SerialInByte );
// -------------------------------------------------------------------
// EN: Program also listen to the GPRS shield message.
// -------------------------------------------------------------------
// EN: If the message ends with <CR> then process the message
if( SerialInByte == 13 ){
// EN: Store the char into the message buffer
ProcessGprsMsg();
}
if( SerialInByte == 10 ){
// EN: Skip Line feed
}
else {
// EN: store the current character in the message string buffer
msg += String(SerialInByte);
}
}
}
// EN: Make action based on the content of the SMS.
// Notice than SMS content is the result of the processing of several GPRS shield messages.
void ProcessSms( String sms ){
sms.toLowerCase();
Serial.print( "ProcessSms for [" );
Serial.print( sms );
Serial.println( "]" );
if( sms.indexOf("on") >= 0 ){
digitalWrite( ledPin, HIGH );
Serial.println( "LED IS ON" );
return;
}
if( sms.indexOf("off") >= 0 ){
digitalWrite( ledPin, LOW );
Serial.println( "LED IS OFF" );
return;
} else {
mySerial.print("AT+CMGF=1\r"); //Because we want to send the SMS in text mode
delay(1000);
mySerial.print("AT+CMGS=\"");
mySerial.print(snFull);
mySerial.print("\"\r");
delay(1000);
mySerial.print("Unknown Command: ");
mySerial.print(sms);
mySerial.print("\r");
delay(1000);
mySerial.write(0x1A); //Equivalent to sending Ctrl+Z
return;
}
}
// EN: Request Text Mode for SMS messaging
void GprsTextModeSMS(){
mySerial.println( "AT+CMGF=1" );
}
void GprsReadSmsStore( String SmsStorePos ){
// Serial.print( "GprsReadSmsStore for storePos " );
// Serial.println( SmsStorePos );
mySerial.print( "AT+CMGR=" );
mySerial.println( SmsStorePos );
}
// EN: Clear the GPRS shield message buffer
void ClearGprsMsg(){
msg = "";
}
// EN: interpret the GPRS shield message and act appropiately
void ProcessGprsMsg() {
Serial.println("");
Serial.print( "GPRS Message: [" );
Serial.print( msg );
Serial.println( "]" );
if( msg.indexOf( "Call Ready" ) >= 0 ){
Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
GprsTextModeSMS();
}
// EN: unsolicited message received when getting a SMS message
if( msg.indexOf( "+CMTI" ) >= 0 ){
Serial.println( "*** SMS Received ***" );
// EN: Look for the coma in the full message (+CMTI: "SM",6)
// In the sample, the SMS is stored at position 6
int iPos = msg.indexOf( "," );
SmsStorePos = msg.substring( iPos+1 );
Serial.print( "SMS stored at " );
Serial.println( SmsStorePos );
// EN: Ask to read the SMS store
GprsReadSmsStore( SmsStorePos );
}
// EN: SMS store read via UART (result of GprsReadSmsStore request)
if( msg.indexOf( "+CMGR:" ) >= 0 ){
// get number of sender
int snPos = msg.indexOf("+1");
Serial.print("SMS From: ");
snTmp = msg.substring(snPos+1);
snFull = "";
for (int i = 0; i < 11; i++){
snFull += snTmp[i];
}
Serial.println(snFull);
// EN: Next message will contains the BODY of SMS
SmsContentFlag = 1;
// EN: Following lines are essentiel to not clear the flag!
ClearGprsMsg();
return;
}
// EN: +CMGR message just before indicate that the following GRPS Shield message
// (this message) will contains the SMS body
if( SmsContentFlag == 1 ){
Serial.println( "*** SMS MESSAGE CONTENT ***" );
Serial.println( msg );
Serial.println( "*** END OF SMS MESSAGE ***" );
ProcessSms( msg );
delSMS();
}
ClearGprsMsg();
// EN: Always clear the flag
SmsContentFlag = 0;
}
void delSMS() {
mySerial.print("AT+CMGD=");
mySerial.println(SmsStorePos);
}
以下は、シリアルモニターに表示されているものです。
