diff options
| author | Keith Packard <keithp@keithp.com> | 2010-10-31 00:38:39 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2010-10-31 00:38:39 -0700 |
| commit | 3493b456399bcc0ea43d28fd4105928bd8793cff (patch) | |
| tree | 869bc731152146632fc55cf9df7d4d6f125e8b68 /src/ao_terraui.c | |
| parent | 3f53e5daeca4d9257aef017594fd65b379b97a1e (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>
Diffstat (limited to 'src/ao_terraui.c')
| -rw-r--r-- | src/ao_terraui.c | 16 |
1 files changed, 1 insertions, 15 deletions
diff --git a/src/ao_terraui.c b/src/ao_terraui.c index 4837273d..714a7579 100644 --- a/src/ao_terraui.c +++ b/src/ao_terraui.c @@ -17,26 +17,12 @@ #include "ao.h" -static __code uint8_t ready_beeps[] = { - AO_BEEP_g, AO_MS_TO_TICKS(100), - AO_BEEP_bb, AO_MS_TO_TICKS(100), - AO_BEEP_dd, AO_MS_TO_TICKS(100), - AO_BEEP_gg, AO_MS_TO_TICKS(200), - AO_BEEP_dd, AO_MS_TO_TICKS(100), - AO_BEEP_gg, AO_MS_TO_TICKS(400), -}; - -#define NUM_READY (sizeof(ready_beeps) / 2) - __xdata uint8_t ao_terraui_wakeup; void ao_terraui(void) { - uint8_t i; - - for (i = 0; i < sizeof(ready_beeps); i += 2) - ao_beep_for(ready_beeps[i], ready_beeps[i+1]); + ao_audio_test(); for (;;) ao_sleep(&ao_terraui_wakeup); } |