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#rockbox log for 2020-09-07

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12:23:56__BilgusSpeachy when you did that bit_delay function for the LCD did you check the compiler actually inlined it?
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12:43:04speachyno, but I'd be surprised if it didn't. It's a whopping three instructions.
12:43:55__BilgusIt didn't even inline it once I made it a macro!
12:44:22speachyjust to be clear, we're talking about the one that's currently committed?
12:44:29__Bilgusyeah
12:44:48speachythat's unexpected.
12:44:57__BilgusI also found out it isn't using the internal oscillator either
12:45:14speachy"it" meaning..?
12:45:21__Bilgusthe LCD
12:46:11speachythe display I/O is bitbanged out GPIOs so yeah, it wouldn't rely on anytthing other than the CPU clock
12:46:58__Bilgusnah you can still divide the clock down
12:47:21__Bilgusits connected somewhere..
12:47:50__Bilgusnot that its a big deal but changinging the OSC freq is pointless in the init
12:48:13speachywell, granted the GPIOs are on the PCLK which is divided from PLL0, but anyway
12:48:30__BilgusI did a few tweaks like grouping the write cmds x3 that bought me 200 fps and the bit delay anothe r200 or so]
12:49:59__Bilgusoh I guess it was 100 for bitdelay but still 300 more fps for not much work
12:51:18speachywait, the OSC you're talking about is the SSD1306's clock. okay.
12:52:52speachyyeah, we don't need more FPS, but lowering the per-frame overhead is all win.
12:56:52speachyour bitdelay loop can be shrunk to 10 itrations and it's still good enough at the highest CPU speed.
12:58:16speachyno, 12 iterations at 600MHz, 10 is enough at 480MHz, and just 4 at 192MHz.
12:59:04__Bilgus^that sounds closer to what I observed
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13:00:28speachybut it's not getting inlined since we're compiling with -Os, and inlining makes the binary (slightly) larger.
13:01:17__Bilgushttps://gerrit.rockbox.org/r/#/c/2740/
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