Linker 3000 / Microbit-VGM

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Dependencies:   microbit

Files at this revision

API Documentation at this revision

Revision 2:74ecf50e4424, committed 2018-02-11

Comitter:
linker3000
Date:
Sun Feb 11 20:07:59 2018 +0000
Parent:
1:09a3520030b4
Commit message:
Revisions

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
microbit.lib Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Sun Feb 11 11:10:58 2018 +0000
+++ b/main.cpp	Sun Feb 11 20:07:59 2018 +0000
@@ -25,7 +25,7 @@
 
 Inspired by Arduino code produced by Artkasser (https://github.com/artkasser)
 
-This code plays BBC micro (SN76489) VGM sound files on a BBC micro:bit.
+This code plays BBC micro (SN76489N) VGM sound files on a BBC micro:bit.
 
 Note that in this code version, the VGM data is stored as a byte array file
 (minus the header info), and not read-in from anywhere. Maybe later!?
@@ -34,7 +34,7 @@
 
 1 x BBC micro:bit breakout board (eg: Kitronik) to get to the required pins
 1 x SN74HC595 shift register IC - easy to obtain
-1 x SN76489 programmable sound generator (PSG) IC (From a reputable[!]
+1 x SN76489N programmable sound generator (PSG) IC (From a reputable[!]
     supplier. You can get them on Ebay and elsewhere but beware of fakes.
 2 x 0.1uF ceramic capacitors
 1 x 4MHz oscillator module - the connections list below assumes a '14-pin'
@@ -69,15 +69,15 @@
     micro:bit P15          MOSI     74HC595 pin 14 (SER)
     micro:bit P13          CE       74HC595 pin 12 (RCLK)
     micro:bit P2           SER      74HC595 pin 11 (SRCLK)
-    micro:bit P8           PSG ~WE  SN76489 pin 5 (~WE)
+    micro:bit P8           PSG ~WE  SN76489N pin 5 (~WE)
     74HC595 Data out       Data bus PSG Data lines - Note that the PSG data
                                     lines are labelled in REVERSE, so the
-                                    wiring between the 595 and the 76489 should
-                                    be 74HC595 D0 --- D7 SN76489
-                                       74HC595 D1 --- D6 SN76489 etc
+                                    wiring between the 595 and the 76489N should
+                                    be 74HC595 D0 --- D7 SN76489N
+                                       74HC595 D1 --- D6 SN76489N etc
     Oscillator P7          GND      To common ground with all other GND pins
-    Oscillator P8          CLK      SN76489 pin 16
-    Audio out              AUDIO    SN76489 pin 7 to an external amplifier,
+    Oscillator P8          CLK      SN76489N pin 14
+    Audio out              AUDIO    SN76489N pin 7 to an external amplifier,
                                     or a piezo sounder through a 1K resistor
     +5V                    VCC      Both ICs, pin 16, Oscillator pin 14; all
                                     active components EXCEPT the micro:bit
@@ -85,7 +85,7 @@
                                     parts
 
 For stability, connect 0.1uF capacitors between VCC and GND near the both the
-74HC595 and SN76489 chips.
+74HC595 and SN76489N chips.
 
 Double-check all wiring before powering up anything!
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/microbit.lib	Sun Feb 11 20:07:59 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/Lancaster-University/code/microbit/#4b89e7e3494f