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authorNicolas Schodet2015-06-03 13:46:44 +0200
committerNicolas Schodet2019-10-07 00:44:44 +0200
commit574480980dcffbfa7cd6dbe71e88253eb4c9feba (patch)
tree5f1c1261341a7c2a56de01d8c6d0815b164be8ba /ucoolib/utils/delay.arm.cc
parentd415a0646e874848cd06482c5d57916cca5cff4a (diff)
Rename ucoolib modules directory from ucoolib to ucoo
Diffstat (limited to 'ucoolib/utils/delay.arm.cc')
-rw-r--r--ucoolib/utils/delay.arm.cc76
1 files changed, 0 insertions, 76 deletions
diff --git a/ucoolib/utils/delay.arm.cc b/ucoolib/utils/delay.arm.cc
deleted file mode 100644
index 294f5ea..0000000
--- a/ucoolib/utils/delay.arm.cc
+++ /dev/null
@@ -1,76 +0,0 @@
-// ucoolib - Microcontroller object oriented library. {{{
-//
-// Copyright (C) 2012 Nicolas Schodet
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the "Software"),
-// to deal in the Software without restriction, including without limitation
-// the rights to use, copy, modify, merge, publish, distribute, sublicense,
-// and/or sell copies of the Software, and to permit persons to whom the
-// Software is furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-//
-// }}}
-#include "delay.arm.hh"
-
-#include <algorithm>
-
-#include <libopencm3/cm3/systick.h>
-#include <libopencm3/stm32/f4/rcc.h>
-
-namespace ucoo {
-
-void
-delay_us (int us)
-{
- // Horrible hack: there is no record of the current systick speed, make
- // guesses based on APB2 clock. Also, suppose that frequency is a multiple
- // of 1 MHz (to avoid 64 bit division).
- int systick_mhz = rcc_ppre2_frequency / (4 * 1000000);
- int cycles = systick_mhz * us;
- STK_CTRL = 0;
- // Loop several times if cycles is too big for the systick timer. Some
- // nanoseconds are lost every second, I can live with that, it simplifies
- // code.
- while (cycles)
- {
- int loop_cycles = std::min (1 << 24, cycles);
- STK_LOAD = loop_cycles - 1;
- STK_VAL = 0;
- STK_CTRL = STK_CTRL_ENABLE;
- while (!(STK_CTRL & STK_CTRL_COUNTFLAG))
- ;
- STK_CTRL = 0;
- cycles -= loop_cycles;
- }
-}
-
-void
-delay_ns (int ns)
-{
- // Horrible hack: there is no record of the current hclock speed, make
- // guesses based on APB2 clock. Also, suppose that frequency is a multiple
- // of 1 MHz (to avoid 64 bit division).
- int hclock_mhz = rcc_ppre2_frequency / (1000000 / 2);
- int cycles = (hclock_mhz * ns + 999) / 1000;
- STK_CTRL = 0;
- // Loop once, ns is supposed to be small.
- STK_LOAD = cycles - 1;
- STK_VAL = 0;
- STK_CTRL = STK_CTRL_CLKSOURCE_AHB | STK_CTRL_ENABLE;
- while (!(STK_CTRL & STK_CTRL_COUNTFLAG))
- ;
- STK_CTRL = 0;
-}
-
-} // namespace ucoo