37 Commits

Author	SHA1	Message	Date
Stuart Longland	b46f9864e7	attiny861: Port to new API	2021-05-23 10:22:16 +10:00
Stuart Longland	137dba352c	attiny85: Port to new API	2021-05-23 10:19:48 +10:00
Luciano Martorella	c19c6dddcb	- Added sequencer from binary 'waveform' and ADSR data. ... - Added waveform generic API to create waveforms, and use period instead of frequency in waveform (avoid division on MCUs) - Introduced 'def' struct in ADSR API for reuse - Multi-track MML parser and compilation - Added some samples from https://electronicmusic.fandom.com/wiki/Music_Macro_Language - Added scale.mml for testing	2021-05-18 20:18:29 +02:00
Stuart Longland	c4a67b9d81	pc main: Code clean-up following merge of PR #1 ... - Adjust the styling of identifiers (camelCase to snake_case) - Fix mixed indentation on line 38. - Fold some long lines to within 80 characters	2021-04-29 08:33:28 +10:00
Luciano Martorella	b9f796c7e7	- Added check for read-error of script file	2021-04-28 22:08:24 +02:00
Luciano Martorella	6e5978d7a3	- Wav output instead of raw via libao ... - Support missing live ao support - Added support for script file	2021-04-28 21:59:14 +02:00
Stuart Longland	a83da25fa1	attiny861: Increase detection delay. ... Increase the delay for detecting the buttons to account for power supplies that may have a slower rise time. Otherwise the MCU thinks there's no buttons present and ignores all inputs.	2018-09-22 17:09:13 +10:00
Stuart Longland	64731b8a0d	attiny861: Reduce voices to 8. ... 16 voices is a bit ambitious in 512 bytes of RAM when each voice occupies 30 bytes.	2017-07-26 07:44:25 +10:00
Stuart Longland	26af316c2c	attiny861 port: Tweak BOD settings. ... Setting the BOD level to 2.7V helps prevent a condition where the MCU partially fires up during connection of power.	2017-07-25 18:40:52 +10:00
Stuart Longland	3a63ab2951	attiny861 main: Simplify button logic. ... Rather than having "hit" and "release" events, we just monitor the debounced button state. This is less likely to "stick" and is sufficient for the job.	2017-07-15 17:24:57 +10:00
Stuart Longland	b0aeaab41e	attiny861 main: Add button auto-detection	2017-07-15 16:30:25 +10:00
Stuart Longland	98df61229d	attiny861 main: Use switch instead of if. ... Years ago, and on MSP430 not AVR, I found that gcc produced tighter code using `if` instead of `switch`. Thus, I found myself always using `if` and never `switch` if I needed branching, since smaller code is faster code, and we needed all the speed we could get. Turns out, AVR does not have this problem, and we get better performance using `switch`.	2017-07-15 15:59:49 +10:00
Stuart Longland	b6e678f045	attiny861 poly_cfg: Drop sample rate to 8kHz ... With the extra processing needed to get bleed-free LED control, we can't quite make 16kHz sample rates.	2017-07-15 15:55:06 +10:00
Stuart Longland	0ef982d463	attiny861 main: Fix adjacent light channel bleed. ... Move to a 3-state machine for PWMing lights so that we don't get bleed from one channel into the next due to propagation delay in the 74HC574.	2017-07-15 15:41:20 +10:00
Stuart Longland	7bb914755c	attiny861 main: Hard-code buttons to channels. ... Rather than hunting for a free channel, just hard-code the button to the channel. This gets polyphonics sort-of working: both notes are out-of-tune which suggests the CPU isn't keeping up.	2017-07-15 15:22:21 +10:00
Stuart Longland	aeefd70fe3	attiny861 port: Fix annoying pop on each note. ... It seems when the NJM2113 is first powered up, it emits a pop noise. Not much I can do about that. The thought was I should power down the amplifier when it is not in use to save power. The outcome is on each note, it would power the amp up, and it would pop. Solution: create a 1msec timer for general timing events, and use that to count down one minute before powering off the amplifier. The toy will pop on first power on, then if left alone for a minute, will pop again on the first note, but will not pop so long as there's only short gaps between notes.	2017-06-11 16:09:42 +10:00
Stuart Longland	f982e0c31f	attiny861: Bump amplitude up. ... Since the number of notes possible with this device is small… in fact, it seems to only want to do monophonics, not sure why, we can bump the amplitude up a bit more without risk of saturation.	2017-05-28 11:08:18 +10:00
Stuart Longland	cf587e3fd8	attiny861 port: Clear button hit/release events at power-on. ... This prevents all the notes being played all at once on power-on.	2017-05-28 11:01:32 +10:00
Stuart Longland	e75d75d20b	attiny861: Enable pull resistors when reading. ... Set PORTA to all ones to enable the pull resistors on all pins.	2017-05-28 10:43:27 +10:00
Stuart Longland	0bed82802b	attiny861 port: Bump sample rate ... Seems we can handle 16kHz sampling… but not 32kHz.	2017-05-28 10:25:21 +10:00
Stuart Longland	75fe949f27	attiny861 port: Semi-working version. ... This implements detection of the pressed buttons, with software debouncing, and plays a note indefinitely until the button is released. The corresponding LED's amplitude is modulated by the ADSR envelope.	2017-05-28 10:19:05 +10:00
Stuart Longland	f2fac87ba3	main: timer: Invert button states ... There's a pull-up with the button asserting a logic low, so invert the inputs.	2017-05-27 15:01:41 +10:00
Stuart Longland	f8346cdea9	Add ATTiny861 port. ... The ATTiny85, as good as it is, has too few pins to really do a lot. You can buy I²C GPIO expanders, but many cost more than programming an ATTiny24A (which has more brains). The nearest equivalent is the ATTiny861, it is basically the same core as the ATTiny85, features the same PLL for high-speed PWM, but comes in a 20-pin package. They cost ~AU$3 in individual quantities. (An ATTiny85 costs AU$1.74, an ATTiny24A costs AU$1.57; thus you save about 20c and a lot of interfacing effort in going to the '861.) Thus it can interface to 8 individual switches with ease. The circuit here uses a 74374 D-latch to drive up to 8 LEDs with PWM and two 4066s to isolate the 8 inputs. Idea being, when the GPIO_EN signal is high, the 4066s are turned on and port A sees the 8 GPIO lines on the other side of the 4066s. 4066s were used because I have 4066s up the wazoo… bought a box of random ICs off eBay many years ago and it came with 5 (!) tubes of MM74HC4066s with 25 ICs each (amongst other parts, some hard-to-find). The bonus being these can be ADC inputs too if desired, allowing sensing of piezo sensors. When we want to switch which LEDs are turned on, we bring GPIO_EN low, switch port A's pins to outputs, assert the desired LEDs, then bring GPIO_EN high again. The 74374 latches those pins, and we are free to put port A back to being inputs. This happens with each sample from the synthesizer, alternating between input and output. Thus the effective rate seen on the LEDs and inputs is half the sample rate. A spare GPIO is available for turning on and off an amplifier (I use the NJR NJM2113D) to save power. The 74374's nOE pin is connected to the PWM output for the lights, thus using pull resistors, one is able to use the one PWM channel for all 8 lights. The lights are turned on in round-robin fashion, so effective duty cycle is ⅛ and the refresh rate is ~500Hz.	2017-05-20 20:48:19 +10:00
Stuart Longland	6ddaad18f2	attiny85: Add ADC-based keyboard support. ... This is a work-in-progress, but we're now able to play some notes by pressing keys.	2017-05-01 17:38:17 +10:00
Stuart Longland	3ff3e349f5	attiny85 Makefile: Add main.o and adckbd.o to object list.	2017-05-01 17:37:48 +10:00
Stuart Longland	8333f32d26	pc Makefile: Add main.o to port object list for PC	2017-05-01 17:37:22 +10:00
Stuart Longland	aa3771dc78	adckbd: Add first stab at ADC-based keyboard. ... This works by relying on a resistor ladder that is part-shorted-out by a button to Vcc. The ADC detects the button pressed from the voltage seen on the ADC. There's some work to be done on this yet.	2017-05-01 17:35:19 +10:00
Stuart Longland	17599177cb	ports/attiny85: Looping sound effects. ... It sounds like the crappiest doorbell you've ever heard, but we now get a crude "ding dong" effect with this code, on a loop.	2017-04-09 10:17:49 +10:00
Stuart Longland	fb59c52b71	ports/pc: Start playback when enable ≠ 0. ... After configuring the voices, we start playback until all channels stop.	2017-04-09 10:13:29 +10:00
Stuart Longland	093b6dd888	ports/attiny85: Set sample rate to 8kHz	2017-04-09 09:17:28 +10:00
Stuart Longland	3f7c6353c1	ports/attiny85: Remove debugging #if blocks	2017-04-09 09:17:04 +10:00
Stuart Longland	b1ddd0c099	ports/attiny85: Define program target	2017-04-09 09:16:50 +10:00
Stuart Longland	9bba7c0c19	ports/attiny85: Work in progress ATTiny85 port	2017-04-09 08:24:14 +10:00
Stuart Longland	9f3cd37109	ports/pc: Set default target in Makefile	2017-04-09 08:23:33 +10:00
Stuart Longland	06199b7da8	pc/main: Tweak output	2017-04-08 21:53:12 +10:00
Stuart Longland	e24cf7376e	ports/pc: Debugging, bugfixes.	2017-04-08 20:56:03 +10:00
Stuart Longland	35e7d5ed9a	Beginnings of separate ports.	2017-04-08 20:23:26 +10:00