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| author | Torsten Duwe <duwe@suse.de> | 2014-10-16 22:18:06 +0200 |
|---|---|---|
| committer | Uwe Hermann <uwe@hermann-uwe.de> | 2014-10-17 11:35:16 +0200 |
| commit | 31fd2ff2f8c7ebf74511496967176ac7b0357cf6 (patch) | |
| tree | ef981ed17b7cf148849a919594646d5e958a34c2 /pwm | |
| parent | 84a41e9378c29e0150379b34508c9c88addf9a6e (diff) | |
| download | sigrok-dumps-31fd2ff2f8c7ebf74511496967176ac7b0357cf6.tar.gz sigrok-dumps-31fd2ff2f8c7ebf74511496967176ac7b0357cf6.zip | |
Add a pwm dump.
Diffstat (limited to 'pwm')
| -rw-r--r-- | pwm/alsa_test/README | 43 | ||||
| -rw-r--r-- | pwm/alsa_test/pwmtest.sr | bin | 0 -> 1277955 bytes |
2 files changed, 43 insertions, 0 deletions
diff --git a/pwm/alsa_test/README b/pwm/alsa_test/README new file mode 100644 index 0000000..a01555c --- /dev/null +++ b/pwm/alsa_test/README @@ -0,0 +1,43 @@ +Hardware used +============= +* Saleae clone +* Olimex AT Mega32U4 "T" board + https://www.olimex.com/Products/Duino/AVR/AVR-T32U4/ + +For "high speed" operation, the T32U4 must be jumpered to run on 5V! + +Software +======== +* avr-gcc & companions +* ALSA +* LUFA + http://www.fourwalledcubicle.com/LUFA.php + in particular, the ClassDriver/AudioOutput demo + LUFA-140302/Demos/Device/ClassDriver/AudioOutput/ + +Adapted the Makefile: + +14c14 +< MCU = at90usb1287 +--- +> MCU = atmega32u4 +16,17c16,17 +< BOARD = USBKEY +< F_CPU = 8000000 +--- +> BOARD = OLIMEXT32U4 +> F_CPU = 16000000 + +[make; avrdude ...] + +Left channel on OC3A (pin32) -> Olimex "D5" -> probe 4. + +Run "aplay -D front:CARD=Demo,DEV=0 /usr/share/sounds/alsa/test.wav" +while the Saleae records for 8 seconds. The result is pwmtest.sr. +Probe 5 was unterminated, see the crosstalk. + +You can test the PWM decoder via CLI and extract the raw values: +sigrok-cli -i pwmtest.sr -P pwm:pwm=4 -B pwm=raw > PWM.raw + +Add e.g. some .wav header using sox: +sox -t raw -e unsigned -b 8 -r 64000 PWM.raw PWM.wav diff --git a/pwm/alsa_test/pwmtest.sr b/pwm/alsa_test/pwmtest.sr Binary files differnew file mode 100644 index 0000000..fd11dfb --- /dev/null +++ b/pwm/alsa_test/pwmtest.sr |