When changing the system clock, you must take care to not exceed the
legal ranges based on voltage and flash wait states.
Existing code made it possible to provide a valid clock structure, that
would run out of bounds temporarily. Some boards would crash with
various Usage faults / Bus errors due to this.
These functions have existed since the initial commit, fallout from
copying an existing file and then trying to implement functions as
needed. F3 ADC doesn't have corresponding functions for some of these,
and this dead code should never have landed. Dropping it for clarity,
and also to stop confusing doxygen.
Start providing async routines for all blocking routines, to make it
easier to use libopencm3 in some RTOS environments. This is not in
anyway intended to be complete, this just covers a single blocking
routine, rcc_wait_for_osc_ready. Documentation added to the top level,
and provided for all stm32 families.
Thoughts: should this be a "sam0" family rather than samd? (Much like Atmel's
own software package lumps all the cortex-m0+ devices in one family)
This was enough to get a basic blinky working at least.
This is not strictly required, as this part is supported by the
devices.data linker script generator tool. However, as we're still in
migration for that tool, and this is the first time we're getting proper
lm3s(qemu) support, keep it for now.
this is the part on the f072 discovery board. The devices.data file is
expected to be already lowercased, while the user provided DEVICE= variable is
then lowercased.
Added lpc43xx to devices.data
For now all lpc43 chips resolve to their cortex-m4 variant. How m0 should
be handled is to be determined later.
devices.data: add some vf6xx and lm4f support. fix typos
devices.data: added missing lpc13 family group
devices.data: fix lm4f with info from examples
devices.data: add some vf610 info
devices.data: add some entries for examples
As discussed with karlp on irc the devices.data file should not contain
gcc specific command line options.
For that reason the command line options for gcc are now generated from
the variables CPU and FPU by the rules in the mk directory.
This breaks the genlink tests.
genlink: simplified devices.data
devices.data already had the information about the family name.
By using the first field (by the pattern used to match it) as family name information that data doesn't
have to be provided explicitly. The same data is used to generate the
CPPFLAGS, such as -DSTM32F1
The architectures block of the devices.data file was redundant.
genlink-config.mk uses family and subfamily to figure out which libopencm3
variant actually exists.
This is common code for f0234, keep renaming files as has become standard, even
if it's a suboptimal solution. This doesn't rename the header which was not
renamed for f3.
Reported-by: https://github.com/gtoonstra
Newlib and arm-non-eabi-gcc likes to use the FPU by default on
Cortex-M4F chips. AS a result, do the right thing and enable the FPU
by default.
This fixes issues where code is generated which uses the FPU and
causes the CPU to hard-fault. This change removes the responsibility
of FPU initialization from the application code.
This makes the lm4f consistent with other M4+ devices that enable the
FPU in core library startup code.
Signed-off-by: Karl Palsson <karlp@tweak.net.au>
Original implementation only checked whether the user had _selected_ the
clock, not whether it had actually switched to the clock or not. For
almost all cases, this made this function either a no-op, if you _had_
selected the clock, or a blocking loop if you hadn't selected it ahead
of time.
Fixes github issue #687
This was inspired by an Arch Linux provided ARM GCC 5.3.0 bug:
It gave an
"internal compiler error: in expand_expr_addr_expr_1, at expr.c:7736"
with the array version of the desig_get_unique_id.
While I was at it, fixed:
- a potential alignment issue with casting uint8_t* buf to uint32_t*
- a funny static in the string definition that does nothing (given const)
This reverts commit aa5e108553ace3079c6087dec796b9e58fe45fa4.
This commit was not meant to land yet, it should have gone for review, and
doesn't yet include all the parts it should touch.
replace bulky hardcoded wait for set and wait for clear with a single asynch
routine. Leave the blocking routines in for compatibility at this point.
NOUP: should be added to other rcc.c files too.
