Add pin mapping code.

This commit also introduces board directories and moves board
specific config into the appropriate board directory.

boards/stm32f4xx-af.csv was extracted from the STM32F4xx datasheet
and hand-tweaked.

make-pins.py takes boards/stm32f4xx-af.csv, boards/stm32f4xx-prefix.c,
and boards/BOARD-NAME/pins.csv as input and generates the file
build/pins_BOARD_NAME.c

The generated pin file for PYBOARD4 looks like this:
https://gist.github.com/dhylands/9063231

The generated pins file includes all of the supported alternate
functions, and includes upsupported alternate functions as comments.

See the commnet block at the top of stm/pin_map.c for details on
how to use the pin mapper.

I also went ahead and modified stm/gpio.c to use the pin mapper.

1 files changed, 62 insertions, 0 deletions

diff --git a/stm/pin.c b/stm/pin.c
new file mode 100644
index 0000000000..e7f6998874
--- /dev/null
+++ b/stm/pin.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stm32f4xx.h>
+
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+
+#include "pin.h"
+
+void pin_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
+    pin_obj_t *self = self_in;
+    print(env, "<Pin %s>", self->name);
+}
+
+mp_obj_t pin_obj_name(mp_obj_t self_in) {
+    pin_obj_t *self = self_in;
+    return MP_OBJ_NEW_QSTR(qstr_from_str(self->name));
+}
+
+mp_obj_t pin_obj_port(mp_obj_t self_in) {
+    pin_obj_t *self = self_in;
+    return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)self->port);
+}
+
+mp_obj_t pin_obj_pin(mp_obj_t self_in) {
+    pin_obj_t *self = self_in;
+    return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)self->pin);
+}
+
+static MP_DEFINE_CONST_FUN_OBJ_1(pin_obj_name_obj, pin_obj_name);
+static MP_DEFINE_CONST_FUN_OBJ_1(pin_obj_port_obj, pin_obj_port);
+static MP_DEFINE_CONST_FUN_OBJ_1(pin_obj_pin_obj, pin_obj_pin);
+
+static const mp_method_t pin_methods[] = {
+    { "name", &pin_obj_name_obj },
+    { "port", &pin_obj_port_obj },
+    { "pin", &pin_obj_pin_obj },
+    { NULL, NULL },
+};
+
+const mp_obj_type_t pin_obj_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Pin,
+    .print = pin_obj_print,
+    .methods = pin_methods,
+};
+
+void pin_af_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
+    pin_af_obj_t *self = self_in;
+    print(env, "<Pin AF %d fn:%d unit:%d typ:%d>", self->idx, self->fn,
+          self->unit, self->type);
+}
+
+const mp_obj_type_t pin_af_obj_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PinAF,
+    .print = pin_af_obj_print,
+};
+