Discussion in "ARM Development" started by    mayank058    May 14, 2015.
Thu May 21 2015, 04:46 AM
#11
dear sir
there is nothing to zip.I just want to know, how to use DAC in LPC2378 or what kind of things I can do with this. Is it possible to convert a pulse wave into sine wave using this DAC.
Sat May 23 2015, 09:52 PM
#12


Does the speaker work?.
'Exactly' where on the board are you measuring ?.


Sir I want to measure the analog signal on CRO.

mayank058


ExperimenterUK


I know you want to measure the analog signal.
I asked where... what pin are you connecting the scope probe to?,
Also, does the onboard speaker work?.
Mon May 25 2015, 04:57 AM
#13
Dear sir,
I am taking output from PIN-8 (P0.26),,,,AOUT pin on the board..and the onboard speaker is also working good..,,
Mon May 25 2015, 06:16 PM
#14
We need to do some simple tests.
Get the speaker to make a sound, continuous if possible.
Check Pin8 with your scope.. do you see a sine or square wave ?
Test jumper 3.. do you see a signal there, while the sound is playing ?

After doing that, try this code.
Do you get any compilation errors ?
//add device  include files

int main() 
 { 
 int bits;
 bits=PINSEL1 & 0xffcfffff; //preserve current settings for other pins
 bits |=0x00200000;    //set P0.26 as AOUT
 PINSEL1 = bits;

 bits=PINMODE1 & 0xffcfffff; //preserve current settings for other pins
 bits |=0x00200000;    //set P0.26 as no pullup or pulldown
 PINMODE1 = bits;

 while(1) //generate squarewave output
 { 
 DACR =0;
 delay();
 DACR =0x0000ffc0;
 delay();
 } 
  
} //end main 


void delay(void)
 {
 int k;
 for(k = 1;k<= 10000;k++); 
}



[ Edited Tue May 26 2015, 09:45 PM ]
Fri Jun 26 2015, 10:00 AM
#15
dear Sir,
This program is working on the board.After downloading of this program, board shows a continuous pulse wave from the AOUT pin on the CRO and a beep sound from speaker.Now what to do. How can I vary the value of AOUT.
Sat Jul 04 2015, 06:14 AM
#16
You need to vary the digital value in DACR register to change the AOUT signal level.

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