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1. 

   Abo
   Member

   I’m currently testing with mirgrating my project from 0.0.9 IDE to 0.0.12 IDE. I found out my SPI communication got broken in the 0.0.12 IDE. I wonder what is the difference in the setup process ?

   I narrow down my code to the following:

   //*************************************
   HardwareSPI Spi(1);
   int SPI_OUT = 0x0A;
   int Configuration_Array[38]={0x0A, 0x0A, 0x0F, 0x0C, 0x03, 0x0E, 0x00, 0x01, 0x00, 0x0E, 0x0E, 0x0A, 0x0C, 0x0A, 0x0D, 0x00, 0x02, 0x0D, 0x0C, 0x00, 0x01, 0x0C, 0x00, 0x04, 0x06, 0x00, 0x05, 0x00, 0x06, 0x0A, 0x05, 0x05, 0x0A, 0x09, 0x00, 0x03, 0x00, 0x0A};

   void setup()
   {
   delay(3000);
   pinMode(10, OUTPUT);
   pinMode(9, OUTPUT);

   Spi.begin(SPI_1_125MHZ, MSBFIRST, 1); // resetting the slave device
   digitalWrite(9, LOW);
   delayMicroseconds(200);
   digitalWrite(9, HIGH);

   for (uint8 i=0;i<38;i++)
   {
   digitalWrite(10, LOW); // CS slave
   delayMicroseconds(50);
   SPI_OUT = Spi.send(Configuration_Array[i]);
   digitalWrite(10, HIGH);

   SerialUSB.println(SPI_OUT, HEX);
   }
   }
   //*************************************

   The above code works fine in 0.0.9, but doesn’t work at all in 0.0.12 (using the same hardware)

   Many thanks!

   Posted 3 years ago #
2. 

   Abo
   Member

   Hello all - I reduce the above program into a smaller one

   //*********************
   void setup()
   {
   delay(3000);
   pinMode(10, OUTPUT);
   pinMode(9, OUTPUT);
   Spi.begin(SPI_1_125MHZ, MSBFIRST, 1);
   }

   void loop()
   {
   digitalWrite(10, LOW);
   delayMicroseconds(50);
   Spi.send(0x0C4);
   digitalWrite(10, HIGH);
   delay(1000);
   }

   I'm trying to see the difference between 0.0.9 vs 0.0.12 on the MISO and MOSI line. For 0.0.9, I see a regular pulse on both MISO and MOSI every second. For 0.0.12, I see only the first pulse, and seems like the SPI is dead there on. Any ideas?

   Posted 3 years ago #
3. 

   Abo
   Member

   Sorry for the series of posts... I was rushing through things... Problem SOLVED (for now)

   1. The regular pulse is on MOSI and the NSS (not MOSI)

   In version 0.0.9, the NSS still controlled by the programmer after Spi.begin. In 0.0.12 (probably 0.0.11 or before too), NSS somehow doesn't response to the digitalWrite(10, HIGH); line.

   2. I put the "pinMode(10, OUTPUT);" line AFTER Spi.begin, then everything started to work again. So somehow we need to explicitly 're-mode' the NSS pin in 0.0.12

   Problem solved.

   There is a related post on NSS in http://forums.leaflabs.com/topic.php?id=1020

   Posted 3 years ago #

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