Using SPI connection in setup()

hey!

i using leonardo control dac via spi. code far looks like

(...)
void setup() {
  serial.begin(9600);

  // start spi library:
  spi.begin();

  // initalize the  data ready , chip select pins:
//  pinmode(datareadypin, input);
  pinmode(chipselectpin, output);

  // create ground
  pinmode(ground, output);
  digitalwrite(ground, low);

  pinmode(led, output);
  digitalwrite(led, low);



  cmd_prefix_a = 3 << (4+8); /// creates 0011 0000 0000 0000
  cmd_prefix_b = 11 << (4+8); // create 1011 0000 0000 0000

  delay(5000);

  senddaccmd(true, 2048); /// calls spi.transfer16 , sets slaveselect
}

void loop() {
  digitalwrite(led, high);
  //select high resolution mode
  senddaccmd(false, 3000);
//  senddaccmd(true, 4095);
 
  delay(100);
}


in later version, loop wait commands via serial , calls spi-interface. however, want write values dac during startup. however, "senddaccmd(true, 2048)" @ end of setup not transmitted (while call in loop works wanted).

is there reason spi not work during setup?

i of course have "first_loop"-boolean , add like

void loop(){
  if (first_loop){
    first_loop = false;
    senddaccmd(true, 2048);

  }
  (...)

}


but that's waste of time first runs , therefore ugly.

quote

however, "senddaccmd(true, 2048)" @ end of setup not transmitted (while call in loop works wanted).

i'm willing bet snippets @ http://snippets-r-us.com.

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > Using SPI connection in setup()

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