Post by thread:Music

Here is a simple test program I made to generate sound via 4 outputs and a R2R ladder (see AN655). Just place a value in FREQ to generate different tones. With a 4 Megs Crystal I was generating sounds around 1.1 Khz, so a higher Xtal will help. Quentin ;*********************************************************************** ;* Look up Tables * ;*********************************************************************** SINETBL ADDWF PCL,F RETLW 0X00 RETLW 0x08 RETLW 0x0A RETLW 0x0C RETLW 0x0D RETLW 0x0E RETLW 0x0E RETLW 0x0F RETLW 0x0F RETLW 0x0F RETLW 0x0E RETLW 0x0E RETLW 0x0D RETLW 0x0C RETLW 0x0A RETLW 0x08 RETLW 0x06 RETLW 0x04 RETLW 0x02 RETLW 0x01 RETLW 0x01 RETLW 0x00 RETLW 0x00 RETLW 0x00 RETLW 0x01 RETLW 0x01 RETLW 0x02 RETLW 0x04 RETLW 0x06 ;*********************************************************************** ;* SUB routines * ;*********************************************************************** DELAY MOVF FREQ,W MOVWF TEMP1 LOOP DECFSZ TEMP1,F GOTO LOOP RETLW 0 ;*********************************************************************** ;* Main Program * ;*********************************************************************** MAIN MOVLW 0X01C MOVWF TBLCNT OUTSINE MOVF TBLCNT,W CALL SINETBL MOVWF PORTA CALL DELAY NOP DECFSZ TBLCNT,F GOTO OUTSINE GOTO MAIN END ; DONE!!!!!

part 0 411 bytes Sure. I have a music box program I wrote a couple years ago to play music using an 8-bit R/2R DAC. The firmware is designed to run on a 10MHz PIC, with music stored in a 24C16 EEPROM; eight simulated tone generators produce sine waves with a simulated "decay" similar to that of a real music box. If there's enough interest I could post the code and/or mail out PCB's (I have a fair number left).

John Payson wrote: > >> > Has anyone developed code to generate musical tones with a PIC. I looked > through the archives but didn't see any references. When I find the stamp > maillist archive, (anybody know where that is?) I'll check that also. > Thanks > << > > Sure. I have a music box program I wrote a couple years ago to > play music using an 8-bit R/2R DAC. The firmware is designed to > run on a 10MHz PIC, with music stored in a 24C16 EEPROM; eight > simulated tone generators produce sine waves with a simulated > "decay" similar to that of a real music box. If there's enough > interest I could post the code and/or mail out PCB's (I have a > fair number left). I did a somewhat nastier, lower budget version than this - stored the music in the PIC, and dispensed with the DAC. I used pulse width modulation to get the effect of 3 channel square waves on one digital channel, so you can just hook a piezo speaker to B0 and GND. The code I have available for downloading is at http://www.codepuppies.com/~ben/sens/pic/saints.zip It's designed for a 10MHz 16F84, but should work on a 16C84. The ZIP contains full source/hex. Probably not the best written prog in the world, but it's one of my first! It's a cheesy version of "When The Saints Go Marching In", which, combined with the rather lame sound quality, produces possibly the most irritating music known to mankind. Be warned. Cheers, Ben

John, I would be interested in both the board and the software. I could put it in my daughters jewelry box, and when she raises the lid, it would play. Thanks, Jim ---------- {Quote hidden}> From: John Payson <spam_OUTsupercatTakeThisOuTCIRCAD.COM> > To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU > Subject: Re: Music > Date: Tuesday, October 20, 1998 4:50 PM > > >> > Has anyone developed code to generate musical tones with a PIC. I looked > through the archives but didn't see any references. When I find the stamp > maillist archive, (anybody know where that is?) I'll check that also. > Thanks > << > > Sure. I have a music box program I wrote a couple years ago to > play music using an 8-bit R/2R DAC. The firmware is designed to > run on a 10MHz PIC, with music stored in a 24C16 EEPROM; eight > simulated tone generators produce sine waves with a simulated > "decay" similar to that of a real music box. If there's enough > interest I could post the code and/or mail out PCB's (I have a > fair number left). >

Tom Rowley asked: >Has anyone developed code to generate musical tones with a PIC. I looked >through the archives but didn't see any references. When I find the stamp >maillist archive, (anybody know where that is?) I'll check that also. My old "TuneMkr.zip" is available for download at: http://www.myke.com/PICMicro/picpage1.htm myke Steven Hunter's "The Second Saladin" is my Book of the Week. http://www.myke.com/Book_Room/book1a.htm Also look at: http://www.myke.com/My_Books/homcu.htm for information on "Handbook of Microcontrollers" which has been named the Main Selection for November 1998 for the Electronics Book Club!