first of all, I have to say, that my English is not the best, so I´m sorry if there are mistakes in the following text.
I want to connect the DDC101 to the Arduino. This is a IC which is connected to a phododiode.
Here you can see the datasheet.
It needs a frequency of 2MHz, which I create with the following code:
const int freqOutputPin = 11;
const int prescale = 1;
const int ocr2aval = 3;
const float period = 2.0 * prescale * (ocr2aval+1) / (F_CPU/1.0e6);
const float freq = 1.0e6 / period;
TCCR2A = ((1 << WGM21) | (1 << COM2A0));
TCCR2B = (1 << CS20);
TIMSK2 = 0;
OCR2A = ocr2aval;
Serial.print(“Period = “);
Serial.print(“Frequency = “);
Now there is an problem. How you can see in the Attach the Arduino has to send a 12bit binary word to the DDC. With each pulse it has to send
Because the Arduino is with normal commands is to slow, I want to use the Master and Slave methode.
Here is an example from the Arduino page:
But I do not really understand it. How can I send my 12bit word to the DDC with this?
Another question is, can I use this, because my outputpin is pin11 for the frequency. And for master and slave I need also pin11. Can you solve
The most important problem is, how I can send the 12 bit word, because I have never worked before with this SPI Device.
Thanks for your help
Ansteuerung DDC.bmp (465 KB)