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git.gir.st - Chiptunes.git/log
Tobias Girstmair [Mon, 27 Jul 2020 12:08:33 +0000 (14:08 +0200)]
pcb: add low pass filter
Tobias Girstmair [Sat, 25 Jul 2020 22:35:32 +0000 (00:35 +0200)]
flex PCB, version 1
as ordered from oshpark
Tobias Girstmair [Thu, 16 Jul 2020 10:11:19 +0000 (12:11 +0200)]
clean up registers
Tobias Girstmair [Thu, 16 Jul 2020 09:43:54 +0000 (11:43 +0200)]
cleanup a bit
Tobias Girstmair [Mon, 9 Mar 2020 10:30:50 +0000 (11:30 +0100)]
cleanup; switch to INT0
working with external pullup and pb0+pb2 shorted
Tobias Girstmair [Mon, 9 Mar 2020 09:56:07 +0000 (10:56 +0100)]
remove i3
since we are now stopping after each iteration, it makes no sense to go
beyond
7864320 samples.
Tobias Girstmair [Mon, 9 Mar 2020 09:50:45 +0000 (10:50 +0100)]
3rd iteration (still not working)
Tobias Girstmair [Sat, 7 Mar 2020 20:39:32 +0000 (21:39 +0100)]
second test pcint0 implementation
Tobias Girstmair [Sat, 7 Mar 2020 18:20:23 +0000 (19:20 +0100)]
first test of pcint0 implementation
note: does not work, since nested interrupts are disabled by default,
and we are not calling SEI before SLEEP. this makes the mcu never wake
up again
Tobias Girstmair [Sat, 7 Mar 2020 17:51:39 +0000 (18:51 +0100)]
first ideas regarding automatic power-off after 1 loop of playback
Tobias Girstmair [Mon, 2 Mar 2020 08:26:03 +0000 (09:26 +0100)]
optimize multiplication for space
AVR Memory Usage
----------------
Device: attiny4
Program: 474 bytes (92.6% Full)
(.text + .data + .bootloader)
Data: 0 bytes (0.0% Full)
(.data + .bss + .noinit)
Tobias Girstmair [Mon, 2 Mar 2020 08:19:23 +0000 (09:19 +0100)]
add note about decision tree multiplication
Tobias Girstmair [Sun, 1 Mar 2020 20:31:13 +0000 (21:31 +0100)]
fix melody for voices 3 and 4
15 months later, I took another look at why the music was off for
channels 3 and 4 and pretty fast noticed that it affects only the voices
using the mod3 subroutine. Executing mod3 with simavr[1] showed that the
compare-branch step is broken. Switching BRPL for the correct BRCS fixed
the problem.
[1]: in the hackiest way imaginable:
gdb> layout regs
gdb> set $r24 = 0x15 # test value for Mh
gdb> set $r23 = 0x16 # test value for Ml
gdb> set $pc = 0x1a # start of mod3 routine
gdb> ni # repeatedly
Tobias Girstmair [Fri, 21 Dec 2018 20:10:59 +0000 (21:10 +0100)]
cleanup some TODOs, #defines
also: hide PORTB2 behind -DDEBUG to save 4 bytes :D
Tobias Girstmair [Fri, 21 Dec 2018 19:33:10 +0000 (20:33 +0100)]
conserve 6 bytes of progmem
replace NOPs in intr.vector with useful instructions
Tobias Girstmair [Fri, 21 Dec 2018 19:10:37 +0000 (20:10 +0100)]
it werks!
putting the notes into .text instead of .data was orignially inteded to
"look better" in avr-size, but actually fixed the
wrong-notes-played-problem!?
Tobias Girstmair [Fri, 21 Dec 2018 18:58:08 +0000 (19:58 +0100)]
calibrate oscillator
just measure frequency of PORTB2 and fiddle with the number until it's
close enough. don't forget to hold your tongue at the right angle!
Tobias Girstmair [Tue, 18 Dec 2018 14:11:30 +0000 (15:11 +0100)]
fix jitter
yeah...don't rjmp into interrupt instead of main loop m(
Tobias Girstmair [Fri, 14 Dec 2018 11:09:47 +0000 (12:09 +0100)]
fix Ml register, clear interrupt before RETI
Tobias Girstmair [Thu, 13 Dec 2018 15:31:19 +0000 (16:31 +0100)]
fix bug: a2 (as tmp) was not cleared after use
Tobias Girstmair [Tue, 11 Dec 2018 22:34:35 +0000 (23:34 +0100)]
remove dedicated zero register (saves 4 bytes of progmem)
Tobias Girstmair [Tue, 11 Dec 2018 22:13:46 +0000 (23:13 +0100)]
swap registers for `t` and `_`
LDing to Xhi or Xlo is undefined, so we had to move `t` somewhere else
and then back. swapping these registers globally solves this.
also rename 'data' to 'notes' to be more expressive
Tobias Girstmair [Tue, 11 Dec 2018 21:47:07 +0000 (22:47 +0100)]
optimize mul_8c / mul_84
Tobias Girstmair [Tue, 11 Dec 2018 21:22:52 +0000 (22:22 +0100)]
refactor mul .macros
Tobias Girstmair [Tue, 11 Dec 2018 20:58:15 +0000 (21:58 +0100)]
add debug pin, remove 2 unnecessary instructions
Tobias Girstmair [Tue, 11 Dec 2018 02:25:03 +0000 (03:25 +0100)]
initialisation code, interrupt vector table
it werks! (it's completely out of tune and too fast, but audio is coming
out of the chip. program at 5v, then play at 3v3. chip can't handle the
stereo amp, but headphones work)
Tobias Girstmair [Tue, 11 Dec 2018 01:30:35 +0000 (02:30 +0100)]
transcribe fakeasm into realasm (IV)
Tobias Girstmair [Tue, 11 Dec 2018 01:15:07 +0000 (02:15 +0100)]
transcribe fakeasm into realasm (III)
Tobias Girstmair [Tue, 11 Dec 2018 01:06:41 +0000 (02:06 +0100)]
transcribe fakeasm into realasm (II)
Tobias Girstmair [Tue, 11 Dec 2018 01:03:47 +0000 (02:03 +0100)]
transcribe fakeasm into realasm (I)
Tobias Girstmair [Tue, 11 Dec 2018 00:48:46 +0000 (01:48 +0100)]
preparing for C -> ASM
Tobias Girstmair [Tue, 11 Dec 2018 00:47:47 +0000 (01:47 +0100)]
import Makefile
Tobias Girstmair [Tue, 11 Dec 2018 00:38:43 +0000 (01:38 +0100)]
new version
using this we can save a few more cycles (code size not yet compared).
working principle:
we can distinguish which number to multiply by with the lower nibble
only. to have maximum overlap, use a decision tree to select where to
go. the upper nibble is then just a straight path (there is not much
to deduplicate).
worst case (roughly):
- mul-tree: 30cy tree + 5cy to load data[t]
- cpi-breq-rjmp: 37cy mul_xx + 5cy to load data[t]
- ldZ-ijmp: 28cy mul_xx + 10cy to load mul_jmptable[t]
Tobias Girstmair [Mon, 10 Dec 2018 23:44:03 +0000 (00:44 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 21:50:43 +0000 (22:50 +0100)]
new version
bring cycle count down from 425 to 409
Tobias Girstmair [Sun, 18 Nov 2018 20:45:30 +0000 (21:45 +0100)]
new version
NOTE: `t` and `x` registers swapped, otherwise we would overwrite Xlo
Tobias Girstmair [Sun, 18 Nov 2018 20:29:07 +0000 (21:29 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:37:26 +0000 (20:37 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:36:11 +0000 (20:36 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:34:48 +0000 (20:34 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:15:41 +0000 (20:15 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:09:06 +0000 (20:09 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:02:55 +0000 (20:02 +0100)]
new version
Tobias Girstmair [Sun, 18 Nov 2018 19:01:01 +0000 (20:01 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 20:21:50 +0000 (21:21 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 20:12:26 +0000 (21:12 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 20:07:57 +0000 (21:07 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 20:01:03 +0000 (21:01 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:59:16 +0000 (20:59 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:53:38 +0000 (20:53 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:44:48 +0000 (20:44 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:42:45 +0000 (20:42 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:42:04 +0000 (20:42 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:40:37 +0000 (20:40 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 19:31:00 +0000 (20:31 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 17:51:19 +0000 (18:51 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 17:44:31 +0000 (18:44 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 17:42:30 +0000 (18:42 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 17:33:40 +0000 (18:33 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 17:29:35 +0000 (18:29 +0100)]
new version
Tobias Girstmair [Sat, 17 Nov 2018 12:16:56 +0000 (13:16 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 19:00:33 +0000 (20:00 +0100)]
new version
var to register association (not final, but close)
Tobias Girstmair [Tue, 13 Nov 2018 18:54:29 +0000 (19:54 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:52:16 +0000 (19:52 +0100)]
new version
check which registers are first used by MOV, which rely on being cleared
Tobias Girstmair [Tue, 13 Nov 2018 18:42:30 +0000 (19:42 +0100)]
new version
use `_` as tmpregister consistently; use x as Xhi
Tobias Girstmair [Tue, 13 Nov 2018 18:29:22 +0000 (19:29 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:20:23 +0000 (19:20 +0100)]
new version
can now get rid of `o` completely, saving 1 register
Tobias Girstmair [Tue, 13 Nov 2018 18:20:11 +0000 (19:20 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:18:33 +0000 (19:18 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:17:47 +0000 (19:17 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:16:31 +0000 (19:16 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:14:59 +0000 (19:14 +0100)]
new version
move `o` out of g() to get rid of variable shift
Tobias Girstmair [Tue, 13 Nov 2018 18:10:39 +0000 (19:10 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:10:14 +0000 (19:10 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:09:22 +0000 (19:09 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 18:07:54 +0000 (19:07 +0100)]
new version
move `x` out of g(), so we can use it as tempvar in g()
Tobias Girstmair [Tue, 13 Nov 2018 17:54:46 +0000 (18:54 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 17:50:14 +0000 (18:50 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 17:47:54 +0000 (18:47 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 17:45:42 +0000 (18:45 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 17:38:27 +0000 (18:38 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 17:16:17 +0000 (18:16 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:51:54 +0000 (17:51 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:18:51 +0000 (17:18 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:13:26 +0000 (17:13 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:12:49 +0000 (17:12 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:12:28 +0000 (17:12 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:08:34 +0000 (17:08 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:07:52 +0000 (17:07 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 16:05:36 +0000 (17:05 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 15:54:17 +0000 (16:54 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 15:51:28 +0000 (16:51 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:54:11 +0000 (03:54 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:43:30 +0000 (03:43 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:37:17 +0000 (03:37 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:31:26 +0000 (03:31 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:27:42 +0000 (03:27 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:23:06 +0000 (03:23 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:22:39 +0000 (03:22 +0100)]
new version
Tobias Girstmair [Tue, 13 Nov 2018 02:13:10 +0000 (03:13 +0100)]
new version