Problem setting the baud rate [RESOLVED]

hi,

i new arduino, , trying use arduino uno send serial commands--so output only.  my problem want use optoisolators, , arduino seems send serial commands @ high speed.  i know should change baud rate, strangely, when change in code data written @ same speed.  i looking @ output on oscilloscope, , bits written @ same rate no matter set baud rate.  my code attached below--i'd appreciate help!

thanks,
andrea

#include "spi.h" // necessary library
int ss=10; // using digital pin 10 spi slave select

void setup()
{
 serial.begin(300);
 pinmode(13, output);
 pinmode(ss, output); // use ss pin
 spi.begin(); // wake spi bus.
 spi.setbitorder(msbfirst); //correct order ad5764.
 spi.setdatamode(spi_mode1); //1 , 3 communicate dac.  1 1 works no clock divider.
 
}

void setvalue(byte db[3])
{
 spi.transfer(db[0]); // send command byte.  00 (write-bar, 0) 010 (data register) 100 (select a-d).  decimal:  a = 16, b = 17, c = 18, d = 19, = 20.
 spi.transfer(db[1]); // significant data bits
 spi.transfer(db[2]);//lowest 8 data bits
}

void loop()
{
  serial.flush();
  byte bytes[3];
         bytes[0]=85;
    bytes[1]=85;
    bytes[2]=85;  
    setvalue(bytes);
    delay(500);
   }

i think confusing rs-232 serial port spi port.   serial.begin(300) sets rs-232 serial port. has nothing speed of spi port. doubt can low 300 baud.
the spi speed set specifying divider this:

code: [select]

spi.setclockdivider(spi_clock_div2);
[edited]this can go 2 down 128 in powers of 2 - example, spi_clock_div32
iirc default spi_clock_div4

why want slow down spi clock?

pete

Arduino Forum > Using Arduino > Programming Questions > Problem setting the baud rate [RESOLVED]

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