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1. 

   ventosardegna
   Member

   Moreaover, I will never change the pinMode I let that I2C protocol change the state of the pin in OUTPUT_OPEN_DRAIN without my command on the sketch.

   Posted 2 years ago #
2. 

   gbulmer
   Moderator

   ventosardegna - "I will try to use another board, maybe I've fried the Maple using non 5V-tolerant ports.."

   If you haven't got another board handy, you could test the pins using the board itself.
   Start with something like the Maple IDE example programs Blink, and a LED, button and a couple of 1K resistor (which should be enough to turn the LED on, and big enough to be easy to pull up or down).
   Test the non-5V tolerant pin 4 to see that it is okay. Check 5V tolerant pins with a 5V supply and use the button or a second pin to create a test signal.

   Posted 2 years ago #
3. 

   ventosardegna
   Member

   Ok thanks gbulmer, tests are OK, i don't have fried the board. I still cannot reach the oscilloscope (maybe tomorrow I hope..)

   You asked me what version of Wire (soft) library I use.
   I have tried 2 versions:

   a) wire library included in the IDE
   b) wire library provided by ala42: http://home.arcor.de/ala42/Wire.zip

   both with no luck.

   Posted 2 years ago #
4. 

   Phono
   Member

   Hi,
   for those who still need help with interfacing the AM2315, I eventually succeeded.
   Here is the recipie.

   1) perform the changes by elstonj :

5. http://forums.leaflabs.com/topic.php?id=1145

Next

2) include a special function to wake up the sensor :
Wire.beginTransmission( ADRESSE_AM2315 ) ;
i2c_start(port);
i2c_shift_out(port, (ADRESSE_AM2315 << 1) | I2C_WRITE);
i2c_send_ack(port) ;
vTaskDelay( DELAY(2) ) ; // Or equivalent, to hold the lines from 800 µs to 3 ms
i2c_stop(port);

3) Include the delays requested by the manufacturer
vTaskDelay(DELAY(1));
Wire.beginTransmission( ADRESSE_AM2315 ) ;
Wire.send( AM2315_READREG ) ;
Wire.send( AM2315_ADRREG ) ;
Wire.send( AM2315_NB_BYTES ) ;

if ( Wire.endTransmission() == SUCCESS )
{
vTaskDelay(DELAY(3));
n = Wire.requestFrom( ADRESSE_AM2315, AM2315_NB_BYTES ) ;
vTaskDelay(DELAY(1));
if ( n == AM2315_NB_BYTES )
{
n = Wire.receive() ; // Last Command
n = Wire.receive() ; // Byte number
Hamb = ( Wire.receive() << 8 ) ; // 1st data byte
Hamb += Wire.receive() ; // 2nd data byte
Tamb = ( Wire.receive() << 8 ) ; // 3rd data byte
Tamb += Wire.receive() ; // 4th data byte
}
}

4) Please note that :
- The nb of bytes must be 6 : Command, Nb bytes, and the four bytes of the data
- The sensor I2C address is actually 0x5C and not 0xB8 as you can read in the documentation.

Hope this will help !

I wish someone could update the libraries in the repository. This holds true also for the bxCAN library for Olimex boards.