Bring back EXTI on F1, with deprecations for gpio.h on F1.

Tested on Maple Mini with examples/mini-exti-test. Changes to Wirish
are minor: use the new EXTI types exti_num and exti_cfg (see below) in
place of now-deprecated variants in ext_interrupts.cpp.

The way I originally did libmaple/exti.h was stupid, and fixing it
turned out to be a little disruptive.

libmaple/exti.h depends on libmaple/gpio.h (for AFIO), but that's a
classic case of exposed implementation detail. So invert the
dependency: make gpio.h depend on exti.h. Do this by adding exti_num
and exti_cfg to exti.h; these respectively replace afio_exti_num and
afio_exti_port. The afio_* variants are now deprecated. (Throw in a
typedef and some macros at the bottom of the F1 series/gpio.h for
backwards compatibility).

Make exti_attach_interrupt() and exti_detach_interrupt() take
exti_num/exti_cfg arguments instead of the afio_* variants.

Make the EXTI dispatch routines __always_inline to defeat GCC -Os.

Many renames throughout libmaple/stm32f1/ to stop using the deprecated
names. Also move the previously F1-only gpio_exti_port() function into
the public libmaple header. Reimplementing it in terms of rcc_clk_ids
lets us deprecate the gpio_dev->exti_port field, which will save space
in the future.

While we're there, I notice that struct gpio_dev is defined once per
series. That's dumb, as it misses the entire point of having device
structs: they contain what's portable. So put the F1 version (which
has the extra EXTI port field) into libmaple/gpio.h, and add the
necessary exti_ports to libmaple/stm32f2/gpio.c. Sigh. We'll get rid
of it eventually, at least.

Clean up some other mistakes in gpio.h files as well (mostly removing
util.h dependency). Sorry for the messy commit.

For portability, add a new series-specific exti function,
exti_select(). The F1 version in (new) libmaple/stm32f1/exti.c uses
AFIO and some new private functionality in libmaple/exti.c and (new)
libmaple/exti_private.h to make this convenient.  We'll be able to do
the SYSCFG equivalent on F2 without any trouble.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/libmaple/stm32f1/exti.c b/libmaple/stm32f1/exti.c
new file mode 100644
index 0000000..b9ff401
--- /dev/null
+++ b/libmaple/stm32f1/exti.c
@@ -0,0 +1,32 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * 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 <libmaple/gpio.h>
+#include "exti_private.h"
+
+void exti_select(exti_num num, exti_cfg port) {
+    exti_do_select(&AFIO_BASE->EXTICR1 + num / 4, num, port);
+}