X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=irc%2Flog;h=9f0da42bde6e531339a43dc48cba5ea5d680877a;hb=0df75b882506e74f46e31f7be530dee1a02d7e3e;hp=c9821f872fd6ba09d0641993e51b23b8cbac2c24;hpb=0e8bd70f3cbeaf8e1e1e5ec305770c4224c67a5f;p=matches%2FMCTX3420.git

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@@ -3441,3 +3441,36 @@
 19:57 < jtanx> bye
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+--- Day changed Thu Sep 26 2013
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+17:52 < jtanx> http://www.ti.com/lit/ug/spruh73i/spruh73i.pdf p1986 (chapter 15) on pwm
+17:55 < jtanx> page 1996 on ePWM
+17:56 < jtanx> ahhhhh
+17:56 < jtanx> for ehrpwm0a/0b
+17:56 < jtanx> the frequency is linked
+18:08 < jtanx> ehrpwm is enhanced resolution pwm
+18:08 < jtanx> Implemented using the A signal path of PWM, that is, on the EPWMxA output. EPWMxB output has
+18:08 < jtanx> conventional PWM capabilities
+18:08 < jtanx> (p2053)
+19:06 < jtanx> if you want to make the pwm stuff not suck
+19:06 < jtanx> there's this file called pwm_test.c
+19:06 < jtanx> that's the driver
+19:59 < jtanx> for future ref: http://armsdr.blogspot.com.au/2013/04/archlinux-on-beaglebone-and-linux-38.html
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+21:19 < jtanx_> urgh wow
+21:19 < jtanx_> ok, so I think pwm1/3/5 shouldn't be used to avoid period conflicts
+21:19 < jtanx_> (pwm0/1 is for channel A/B of one pwm device, 3/4 another, 5/6 another)
+21:20 < jtanx_> btw the correspondence between pwmX and pin number is:
+21:21 < jtanx_> P9_22, P9_21, P9_42. P9_14, P9_16, P8_19, P8_13, P9_28
+21:23 < jtanx_> pwm 2/7 correspond to eCAP devices
+21:24 < jtanx_> which I think are to capture PWM input
+21:24 < jtanx_> but they can also be used to generate PWM output, afaik
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