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We can implement it in terms of _i2c_bus_clk() instead of hard-coding
STM32_PCLK1.
This might be overkill, since I2C peripherals are slow and thus likely
to be on APB1 for all STM32 devices (that is the case for F2/F4, for
instance), but if we're going to have _i2c_bus_clk(), we might as well
respect it.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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This won't work on F2, which at times has SDA and SCL on different
ports (e.g. I2C3 SDA on PC9, SCL on PA8). Add .sda_port and .scl_port
replacements, which are used when the now-deprecated .gpio_port is
null. Use them correctly everywhere, with some new i2c_private.h
helper functionality.
Sigh. The F1 I2C code tries too hard to guess what you wanted; it's
not porting well at all.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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This should help avoid surprising some users.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Do this via new private _i2c_set_ccr_trise().
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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The IRQ priority hack is unnecessary on targets with properly
functioning I2C IRQ handlers, so we shouldn't use it unless we have
to. Add a mechanism so a series header can provide such a hack if
necessary. Have the F1 series header use this mechanism.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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These are necessary to pull out some calls to gpio_set_mode().
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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Bring back <libmaple/i2c.h> support on STM32F1 with a view towards how
it'll be implemented on STM32F2. There are still many F1-isms in
libmaple/i2c.c and <libmaple/i2c.h>, to be dealt with subsequently.
Move device declarations and base pointer definitions to a new F1
<series/i2c.h>. The register maps and bit definitions themselves are
identical on both series, so leave them in the libmaple header.
Add i2c_private.h, which contains:
- I2C_DEV(), a convenience macro for defining an i2c_dev, and
- declarations for the event and error IRQ handlers.
The IRQ handlers are large, and I2C is slow anyway, so I see no reason
to make them inline in the private header (as we do for some other
peripherals). We just expose the existing ones that were formerly
static in libmaple/i2c.c, but prefix the names with underscore.
Move the device declarations and IRQ handlers into new
stm32f1/i2c.c. These use the i2c_private.h API.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
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