From 31fd2ff2f8c7ebf74511496967176ac7b0357cf6 Mon Sep 17 00:00:00 2001
From: Torsten Duwe <duwe@suse.de>
Date: Thu, 16 Oct 2014 22:18:06 +0200
Subject: Add a pwm dump.

---
 pwm/alsa_test/README     |  43 +++++++++++++++++++++++++++++++++++++++++++
 pwm/alsa_test/pwmtest.sr | Bin 0 -> 1277955 bytes
 2 files changed, 43 insertions(+)
 create mode 100644 pwm/alsa_test/README
 create mode 100644 pwm/alsa_test/pwmtest.sr

(limited to 'pwm')

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
new file mode 100644
index 0000000..fd11dfb
Binary files /dev/null and b/pwm/alsa_test/pwmtest.sr differ
-- 
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