PIC16F690 Sine Wave

[JasonMcG]

How do you go about coding in assembly to code a sine wave? I was thinking of using a lookup table but not sure what I should do

 

[ronsimpson]

search the forum. There has been examples posted.

 

[JasonMcG]

If you could direct me to a page where they coded in assembly that would be great

 

[jjw]

Here is a DDS generator for AVR:**broken link removed**
and assembly code **broken link removed**
Should be easy to convert for PIC

 

[JasonMcG]

Nah not so easy I find

 

[jjw]

Here is DDS-generator for PIC16F628. http://www.g4jnt.com/PIC_DDS.pdf
It is more complicated than the AVR example, running the frequency generating loop in an interrupt.
There is a zip-file containing all documentation.

 

[shegzzyy]

Here is DDS-generator for PIC16F628. http://www.g4jnt.com/PIC_DDS.pdf
It is more complicated than the AVR example, running the frequency generating loop in an interrupt.
There is a zip-file containing all documentation.

i cant find the zip file.the pdf link is also unavailable.thanks

 

[jjw]

i cant find the zip file.the pdf link is also unavailable.thanks

The pdf opens directly for me and the zip-file link is inside the pdf.
Here is link to the project page, which includes DDS-projects:http://www.g4jnt.com/projects.htm

 

[be80be]

PortC can be used I was thinking It was just 7 bit wide but its 8

 

[shegzzyy]

The pdf opens directly for me and the zip-file link is inside the pdf.
Here is link to the project page, which includes DDS-projects:http://www.g4jnt.com/projects.htm

thanks very much.it's opening now.

 

[Colin]

I simply outputted a square wave to a resistor/capacitor network and it was recognised by the telephone DTMF so it was quite accurate.