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The new style for configuring the PLL is to initialize
a (series-specific) struct rcc_pll_cfg, and pass a pointer to it to
rcc_configure_pll(). After that's done, you can use
rcc_turn_on_clk(RCC_CLK_PLL) to turn on the main PLL, and busy-wait
until rcc_is_clk_ready(RCC_CLK_PLL) is true to make sure the new
configuration took effect.
- libmaple/rcc.h:
-- Add struct rcc_pll_cfg, which specifies a PLL configuration. This
specifies a PLL source and a void pointer to series-specific PLL
configuration data.
-- Add rcc_configure_pll(), which takes a pointer to struct
rcc_pll_cfg, and configures the main PLL. It's up to each series
to define this function.
- stm32f1/rcc.h: Add struct stm32f1_rcc_pll_data, to store F1-specific
PLL configuration state.
- stm32f1/rcc.c: Add an implementation for rcc_configure_pll().
- stm32f2/rcc.h: Add struct stm32f2_rcc_pll_data, to store F2-specific
PLL configuration data.
- stm32f2/rcc.c: Add an implementation for rcc_configure_pll().
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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We're going to replace this with a more portable mechanism.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Additions:
- rcc_switch_sysclk():
For changing the clock used as SYSCLK's source.
- enum rcc_clk:
One for each system and secondary clock source (e.g. HSE,
LSE). These are defined on a per-series basis in each of the
<series/rcc.h>.
- rcc_turn_on_clk(),
rcc_turn_off_clk(),
rcc_is_clk_ready():
For turning on system and secondary clock sources, and checking
whether or not they're ready. Uses enum rcc_clk.
Removals:
- rcc_clk_init(): There's no way to port this to F2. Move it to the F1
header. This also means we can remove the empty implementation and
enum rcc_pll_multiplier from the F2 RCC header, where it doesn't
make any sense.
Also fix up some includes, and rewrite rcc_clk_init() in terms of the
new clock source management functions.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Make a single function, flash_enable_features(), to control the access
characteristics of Flash memory (i.e. to write to the non-latency bits
of ACR).
In so doing, make everybody pretend to allow instruction and data
caching. On STM32F1, trying to turn these on simply has no
effect. This allows unconditionally trying to turn them on, which will
simplify users' lives.
This has the ancillary benefit of making the stm32f2- and
stm32f1-specific flash.c files unnecessary; delete these.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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enum stm32_series gives a tag to each STM32 series, including the ones
we don't yet support.
STM32_MCU_SERIES is a define which the series stm32.h header must
provide, identifying the series of the MCU being targeted.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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This is for greater consistency with the ST application notes, which
refer to migrating "across" series (e.g. F1 to F2), but compatibility
"within" a family (e.g. F1).
So:
- Move libmaple/stm32x/include/family to .../include/series/ and fix
up includes appropriately.
- Refer to "family" headers as "series" headers in comments.
- Make similar "find and replace"-style changes to build system
variable names and comments.
- Move support/ld/stm32/family to .../stm32/series.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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