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Arduino SPI Modes
Arduino SPI Modes
I have been using the Arduino SPI library with an Arduino Mega 2560 recently, it took me a little while to work out the SPI
modes, which are straightforward, but I though I would post some traces to backup the reference links which I will include. For
me looking at the scope trace, a picture, was a thousand words.
The SPI wiki page gives an excellent definition of the format.
The code :
#include <SPI.h>
#define SPISpeed 100000
void setup()
{ Serial.begin(9600);
SPI.begin();
}
void loop()
{ SPIWord();
delay(10);
}
void SPIWord()
{ SPI.beginTransaction (SPISettings ( SPISpeed, MSBFIRST, SPI_MODE0 ) ); // MODE0 / MODE1 / MODE2 / MODE3
SPI.transfer( B01000010 );
SPI.endTransaction();
}
modes, which are straightforward, but I though I would post some traces to backup the reference links which I will include. For
me looking at the scope trace, a picture, was a thousand words.
The SPI wiki page gives an excellent definition of the format.
The code :
#include <SPI.h>
#define SPISpeed 100000
void setup()
{ Serial.begin(9600);
SPI.begin();
}
void loop()
{ SPIWord();
delay(10);
}
void SPIWord()
{ SPI.beginTransaction (SPISettings ( SPISpeed, MSBFIRST, SPI_MODE0 ) ); // MODE0 / MODE1 / MODE2 / MODE3
SPI.transfer( B01000010 );
SPI.endTransaction();
}
Mode0
Mode1
Mode2
Mode3
SPISpeed = 100000
SPISpeed = 1000000
