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(parent: 3f53e5d) | patch
teleterra: Add PWM audio system
authorKeith Packard <keithp@keithp.com>
Sun, 31 Oct 2010 07:38:39 +0000 (00:38 -0700)
committerKeith Packard <keithp@keithp.com>
Sun, 31 Oct 2010 07:38:39 +0000 (00:38 -0700)
commit3493b456399bcc0ea43d28fd4105928bd8793cff
tree869bc731152146632fc55cf9df7d4d6f125e8b68tree | snapshot
parent3f53e5daeca4d9257aef017594fd65b379b97a1ecommit | diff
teleterra: Add PWM audio system

This uses timers 3 and 4 to emit 8-bit 11025Hz audio using a 93.8kHz
carrier. A simple low-pass filter to eliminate the 93.8kHz signal
results in credible 8-bit audio.

There is a giant sample for testing in the ao_audio code which shouldn't
be included in a product.

Signed-off-by: Keith Packard <keithp@keithp.com>
src/Makefile.proto diff | blob | history
src/ao.h diff | blob | history
src/ao_audio.c [new file with mode: 0644] blob
src/ao_teleterra.c diff | blob | history
src/ao_terraui.c diff | blob | history
src/cc1111.h diff | blob | history
src/teleterra-v0.1/Makefile.defs [new file with mode: 0644] blob
AltOS - the operating system for Altus Metrum products