I2C: Restore on F1, refactoring prep for F2.

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>

1 files changed, 1 insertions, 16 deletions

diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h
index 7ee0b9a..2b36404 100644
--- a/libmaple/include/libmaple/i2c.h
+++ b/libmaple/include/libmaple/i2c.h
@@ -37,6 +37,7 @@
 extern "C" {
 #endif
 
+#include <series/i2c.h>
 #include <libmaple/libmaple_types.h>
 #include <libmaple/rcc.h>
 #include <libmaple/nvic.h>
@@ -97,22 +98,6 @@ typedef struct i2c_dev {
 } i2c_dev;
 
 /*
- * Devices
- */
-
-extern i2c_dev* const I2C1;
-extern i2c_dev* const I2C2;
-
-/*
- * Register map base pointers
- */
-
-/** I2C1 register map base pointer */
-#define I2C1_BASE               ((struct i2c_reg_map*)0x40005400)
-/** I2C2 register map base pointer */
-#define I2C2_BASE               ((struct i2c_reg_map*)0x40005800)
-
-/*
  * Register bit definitions
  */