228 lines
6.7 KiB
C
228 lines
6.7 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stm32f4xx.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "runtime.h"
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#include "nlr.h"
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#include "map.h"
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#include "pin.h"
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// Usage Model:
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//
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// All Board Pins are predefined as pyb.Pin.board.Name
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//
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// x1_pin = pyb.Pin.board.X1
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//
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// g = pyb.gpio(pyb.Pin.board.X1, 0)
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//
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// CPU pins which correspond to the board pins are available
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// as pyb.cpu.Name. For the CPU pins, the names are the port letter
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// followed by the pin number. On the PYBOARD4, pyb.Pin.board.X1 and
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// pyb.Pin.cpu.B6 are the same pin.
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//
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// You can also use strings:
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//
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// g = pyb.gpio('X1', 0)
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//
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// Users can add their own names:
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//
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// pyb.Pin("LeftMotorDir", pyb.Pin.cpu.C12)
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// g = pyb.gpio("LeftMotorDir", 0)
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//
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// and can query mappings
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//
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// pin = pyb.Pin("LeftMotorDir");
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//
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// Users can also add their own mapping function:
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//
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// def MyMapper(pin_name):
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// if pin_name == "LeftMotorDir":
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// return pyb.Pin.cpu.A0
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//
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// pyb.Pin.mapper(MyMapper)
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//
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// So, if you were to call: pyb.gpio("LeftMotorDir", 0)
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// then "LeftMotorDir" is passed directly to the mapper function.
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//
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// To summarize, the following order determines how things get mapped into
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// an ordinal pin number:
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//
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// 1 - Directly specify a pin object
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// 2 - User supplied mapping function
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// 3 - User supplied mapping (object must be usable as a dictionary key)
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// 4 - Supply a string which matches a board pin
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// 5 - Supply a string which matches a CPU port/pin
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//
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// You can set pyb.Pin.debug(True) to get some debug information about
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// how a particular object gets mapped to a pin.
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static void pin_map_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)self_in;
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print(env, "<PinMap>");
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}
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static mp_obj_t pin_map_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
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pin_map_obj_t *self = self_in;
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rt_check_nargs(n_args, 1, 2, n_kw, false);
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if (n_args > 1) {
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if (!self->map_dict) {
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self->map_dict = mp_obj_new_dict(1);
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}
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mp_obj_dict_store(self->map_dict, args[0], args[1]);
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return mp_const_none;
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}
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// Run an argument through the mapper and return the result.
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return (mp_obj_t)pin_map_user_obj(args[0]);
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}
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static mp_obj_t pin_map_obj_mapper(uint n_args, mp_obj_t *args) {
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pin_map_obj_t *self = args[0];
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if (n_args > 1) {
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self->mapper = args[1];
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return mp_const_none;
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}
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return self->mapper;
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}
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static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pin_map_obj_mapper_obj, 1, 2, pin_map_obj_mapper);
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static mp_obj_t pin_map_obj_debug(uint n_args, mp_obj_t *args) {
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pin_map_obj_t *self = args[0];
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if (n_args > 1) {
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self->debug = rt_is_true(args[1]);
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return mp_const_none;
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}
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return MP_BOOL(self->debug);
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}
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static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pin_map_obj_debug_obj, 1, 2, pin_map_obj_debug);
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static void pin_map_load_attr(mp_obj_t self_in, qstr attr_qstr, mp_obj_t *dest) {
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(void)self_in;
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const char *attr = qstr_str(attr_qstr);
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if (strcmp(attr, "mapper") == 0) {
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dest[0] = (mp_obj_t)&pin_map_obj_mapper_obj;
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dest[1] = self_in;
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}
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if (strcmp(attr, "debug") == 0) {
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dest[0] = (mp_obj_t)&pin_map_obj_debug_obj;
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dest[1] = self_in;
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}
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if (strcmp(attr, pin_board_pins_obj.name) == 0) {
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dest[0] = (mp_obj_t)&pin_board_pins_obj;
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dest[1] = MP_OBJ_NULL;
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}
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if (strcmp(attr, pin_cpu_pins_obj.name) == 0) {
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dest[0] = (mp_obj_t)&pin_cpu_pins_obj;
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dest[1] = MP_OBJ_NULL;
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}
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}
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static const mp_obj_type_t pin_map_obj_type = {
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{ &mp_type_type },
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.name = MP_QSTR_PinMap,
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.print = pin_map_obj_print,
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.call = pin_map_call,
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.load_attr = pin_map_load_attr,
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};
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static const pin_map_obj_t pin_map_obj_init = {
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{ &pin_map_obj_type },
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.mapper = MP_OBJ_NULL,
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.map_dict = MP_OBJ_NULL,
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.debug = false,
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};
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pin_map_obj_t pin_map_obj;
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void pin_map_init(void) {
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pin_map_obj = pin_map_obj_init;
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}
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// C API used to convert a user-supplied pin name into an ordinal pin number.
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const pin_obj_t *pin_map_user_obj(mp_obj_t user_obj) {
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const pin_obj_t *pin_obj;
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// If a pin was provided, then use it
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if (MP_OBJ_IS_TYPE(user_obj, &pin_obj_type)) {
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pin_obj = user_obj;
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if (pin_map_obj.debug) {
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printf("Pin map passed pin ");
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mp_obj_print((mp_obj_t)pin_obj, PRINT_STR);
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printf("\n");
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}
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return pin_obj;
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}
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if (pin_map_obj.mapper) {
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pin_obj = rt_call_function_1(pin_map_obj.mapper, user_obj);
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if (pin_obj != mp_const_none) {
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if (!MP_OBJ_IS_TYPE(pin_obj, &pin_obj_type)) {
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nlr_jump(mp_obj_new_exception_msg(&mp_type_ValueError, "Pin.mapper didn't return a Pin object"));
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}
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if (pin_map_obj.debug) {
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printf("Pin.mapper maps ");
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mp_obj_print(user_obj, PRINT_REPR);
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printf(" to ");
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mp_obj_print((mp_obj_t)pin_obj, PRINT_STR);
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printf("\n");
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}
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return pin_obj;
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}
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// The pin mapping function returned mp_const_none, fall through to
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// other lookup methods.
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}
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if (pin_map_obj.map_dict) {
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mp_map_t *pin_map_map = mp_obj_dict_get_map(pin_map_obj.map_dict);
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mp_map_elem_t *elem = mp_map_lookup(pin_map_map, user_obj, MP_MAP_LOOKUP);
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if (elem != NULL && elem->value != NULL) {
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pin_obj = elem->value;
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if (pin_map_obj.debug) {
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printf("Pin.map_dict maps ");
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mp_obj_print(user_obj, PRINT_REPR);
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printf(" to ");
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mp_obj_print((mp_obj_t)pin_obj, PRINT_STR);
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printf("\n");
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}
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return pin_obj;
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}
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}
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// See if the pin name matches a board pin
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const char *pin_name = mp_obj_str_get_str(user_obj);
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pin_obj = pin_find_named_pin(pin_board_pins, pin_name);
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if (pin_obj) {
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if (pin_map_obj.debug) {
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printf("Pin.board maps ");
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mp_obj_print(user_obj, PRINT_REPR);
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printf(" to ");
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mp_obj_print((mp_obj_t)pin_obj, PRINT_STR);
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printf("\n");
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}
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return pin_obj;
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}
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// See if the pin name matches a cpu pin
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pin_obj = pin_find_named_pin(pin_cpu_pins, pin_name);
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if (pin_obj) {
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if (pin_map_obj.debug) {
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printf("Pin.cpu maps ");
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mp_obj_print(user_obj, PRINT_REPR);
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printf(" to ");
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mp_obj_print((mp_obj_t)pin_obj, PRINT_STR);
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printf("\n");
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}
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return pin_obj;
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}
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nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin '%s' not a valid pin identifier", pin_name));
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}
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